path: root/sys/contrib/dev/acpica/CHANGES.txt

----------------------------------------
15 August 2002.  Summary of changes for this release.

1) ACPI CA Core Subsystem Version 20020815:

Fixed a reported problem where a Store to a method argument
that contains a reference did not perform the indirect store
correctly.  This problem was created during the conversion
to the new reference object model – the indirect store to a
method argument code was not updated to reflect the new
model.

Reworked the ACPI mode change code to better conform to ACPI
2.0, handle corner cases, and improve code legibility (Kochi
Takayoshi)

Fixed a problem with the pathname parsing for the carat (^)
prefix.  The heavy use of the carat operator by the new
namepath optimization in the iASL compiler uncovered a
problem with the AML interpreter handling of this prefix.
In the case where one or more carats precede a single
nameseg, the nameseg was treated as standalone and the
search rule (to root) was inadvertently applied.  This could
cause both the iASL compiler and the interpreter to find the
wrong object or to miss the error that should occur if the
object does not exist at that exact pathname.

Found and fixed the problem where the HP Pavilion DSDT would
not load.  This was a relatively minor tweak to the table
loading code (a problem caused by the unexpected encounter
with a method invocation not within a control method), but
it does not solve the overall issue of the execution of AML
code at the table level.  This investigation is still
ongoing.

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  69.1K Code,   8.2K Data,   77.3K
Total
    Debug Version:     149.4K Code,  61.6K Data,  211.0K
Total
  Current Release:
    Non-Debug Version:  69.6K Code,   8.3K Data,   77.9K
Total
    Debug Version:     150.0K Code,  61.7K Data,  211.7K
Total


2) Linux

Remove redundant slab.h include (Brad Hards)

Fix several bugs in thermal.c (Herbert Nachtnebel)

Make CONFIG_ACPI_BOOT work properly (Pavel Machek)

Change acpi_system_suspend to use updated irq functions
(Pavel Machek)

Export acpi_get_firmware_table (Matthew Wilcox)

Use proper root proc entry for ACPI (Kochi Takayoshi)

Fix early-boot table parsing (Bjorn Helgaas)


3) iASL Compiler/Disassembler

Reworked the compiler options to make them more consistent
and to use two-letter options where appropriate.  We were
running out of sensible letters.   This may break some
makefiles, so check the current options list by invoking the
compiler with no parameters.

Completed the design and implementation of the ASL namepath
optimization option for the compiler.  This option optimizes
all references to named objects to the shortest possible
path.  The first attempt tries to utilize a single nameseg
(4 characters) and the “search-to-root” algorithm used by
the interpreter.  If that cannot be used (because either the
name is not in the search path or there is a conflict with
another object with the same name), the pathname is
optimized using the carat prefix (usually a shorter string
than specifying the entire path from the root.)

Implemented support to obtain the DSDT from the Windows
registry (when the disassembly option is specified with no
input file).  Added this code as the implementation for
AcpiOsTableOverride in the Windows OSL.  Migrated the 16-bit
code (used in the AcpiDump utility) to scan memory for the
DSDT to the AcpiOsTableOverride function in the DOS OSL to
make the disassembler truly OS independent.

Implemented a new option to disassemble and compile in one
step.  When used without an input filename, this option will
grab the DSDT from the local machine, disassemble it, and
compile it in one step.

Added a warning message for invalid escapes (a backslash
followed by any character other than the allowable escapes).
This catches the quoted string error “\_SB_” (which should
be “\\_SB_” ).  Also, there are numerous instances in the
ACPI specification where this error occurs.

Added a compiler option to disable all optimizations.  This
is basically the “compatibility mode” because by using this
option, the AML code will come out exactly the same as other
ASL compilers.

Added error messages for incorrectly ordered dependent
resource functions.  This includes: missing EndDependentFn
macro at end of dependent resource list, nested dependent
function macros (both start and end), and missing
StartDependentFn macro.  These are common errors that should
be caught at compile time.

Implemented _OSI support for the disassembler and compiler.
_OSI must be included in the namespace for proper
disassembly (because the disassembler must know the number
of arguments.)

Added an “optimization” message type that is optional (off
by default).  This message is used for all optimizations –
including constant folding, integer optimization, and
namepath optimization.

----------------------------------------
25 July 2002.  Summary of changes for this release.


1) ACPI CA Core Subsystem Version 20020725:

The AML Disassembler has been enhanced to produce compilable
ASL code and has been integrated into the iASL compiler (see
below) as well as the single-step disassembly for the AML
debugger and the disassembler for the AcpiDump utility.  All
ACPI 2.0A opcodes, resource templates and macros are fully
supported.  The disassembler has been tested on over 30
different AML files, producing identical AML when the
resulting disassembled ASL file is recompiled with the same
ASL compiler.

Modified the Resource Manager to allow zero interrupts and
zero dma channels during the GetCurrentResources call.  This
was causing problems on some platforms.

Added the AcpiOsRedirectOutput interface to the OSL to
simplify output redirection for the AcpiOsPrintf and
AcpiOsVprintf interfaces.

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  68.7K Code,   7.4K Data,   76.1K
Total
    Debug Version:     142.9K Code,  58.7K Data,  201.6K
Total
  Current Release:
    Non-Debug Version:  69.1K Code,   8.2K Data,   77.3K
Total
    Debug Version:     149.4K Code,  61.6K Data,  211.0K
Total


2) Linux

Fixed a panic in the EC driver (Dominik Brodowski)

Implemented checksum of the R/XSDT itself during Linux table
scan (Richard Schaal)


3) iASL compiler

The AML disassembler is integrated into the compiler.  The "-
d" option invokes the disassembler  to completely
disassemble an input AML file, producing as output a text
ASL file with the extension ".dsl" (to avoid name collisions
with existing .asl source files.)  A future enhancement will
allow the disassembler to obtain the BIOS DSDT from the
registry under Windows.

Fixed a problem with the VendorShort and VendorLong resource
descriptors where an invalid AML sequence was created.

Implemented a fix for BufferData term in the ASL parser.  It
was inadvertently defined twice, allowing invalid syntax to
pass and causing reduction conflicts.

Fixed a problem where the Ones opcode could get converted to
a value of zero if "Ones" was used where a byte, word or
dword value was expected.  The 64-bit value is now truncated
to the correct size with the correct value.


----------------------------------------
02 July 2002.  Summary of changes for this release.


1) ACPI CA Core Subsystem Version 20020702:

The Table Manager code has been restructured to add several
new features.  Tables that are not required by the core
subsystem (other than the FADT, DSDT, FACS, PSDTs, etc.) are
no longer validated in any way and are returned from
AcpiGetFirmwareTable if requested.  The AcpiOsTableOverride
interface is now called for each table that is loaded by the
subsystem in order to allow the host to override any table
it chooses.  Previously, only the DSDT could be overridden.
Added one new files, tbrsdt.c and tbgetall.c.

Fixed a problem with the conversion of internal package
objects to external objects (when a package is returned from
a control method.)  The return buffer length was set to zero
instead of the proper length of the package object.

Fixed a reported problem with the use of the RefOf and
DeRefOf operators when passing reference arguments to
control methods.  A new type of Reference object is used
internally for references produced by the RefOf operator.

Added additional error messages in the Resource Manager to
explain AE_BAD_DATA errors when they occur during resource
parsing.

Split the AcpiEnableSubsystem into two primitives to enable
a finer granularity initialization sequence.  These two
calls should be called in this order: AcpiEnableSubsystem
(flags), AcpiInitializeObjects (flags).  The flags parameter
remains the same.


2) Linux

Updated the ACPI utilities module to understand the new
style of fully resolved package objects that are now
returned from the core subsystem.  This eliminates errors of
the form:

    ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PPB_._PRT]
    acpi_utils-0430 [145] acpi_evaluate_reference:
        Invalid element in package (not a device reference)

The method evaluation utility uses the new buffer allocation
scheme instead of calling AcpiEvaluate Object twice.

Added support for ECDT. This allows the use of the Embedded
Controller before the namespace has been fully initialized,
which is necessary for ACPI 2.0 support, and for some
laptops to initialize properly. (Laptops using ECDT are
still rare, so only limited testing was performed of the
added functionality.)

Fixed memory leaks in the EC driver.

Eliminated a brittle code structure in acpi_bus_init().

Eliminated the acpi_evaluate() helper function in utils.c.
It is no longer needed since acpi_evaluate_object can
optionally allocate memory for the return object.

Implemented fix for keyboard hang when getting battery
readings on some systems (Stephen White)

PCI IRQ routing update (Dominik Brodowski)

Fix an ifdef to allow compilation on UP with LAPIC but no
IOAPIC support

----------------------------------------
11 June 2002.  Summary of changes for this release.


1) ACPI CA Core Subsystem Version 20020611:

Fixed a reported problem where constants such as Zero and
One appearing within _PRT packages were not handled
correctly within the resource manager code.  Originally
reported against the ASL compiler because the code generator
now optimizes integers to their minimal AML representation
(i.e. AML constants if possible.)  The _PRT code now handles
all AML constant opcodes correctly (Zero, One, Ones,
Revision).

Fixed a problem with the Concatenate operator in the AML
interpreter where a buffer result object was incorrectly
marked as not fully evaluated, causing a run-time error of
AE_AML_INTERNAL.

All package sub-objects are now fully resolved before they
are returned from the external ACPI interfaces.  This means
that name strings are resolved to object handles, and
constant operators (Zero, One, Ones, Revision) are resolved
to Integers.

Implemented immediate resolution of the AML Constant opcodes
(Zero, One, Ones, Revision) to Integer objects upon
detection within the AML stream. This has simplified and
reduced the generated code size of the subsystem by
eliminating about 10 switch statements for these constants
(which previously were contained in Reference objects.)  The
complicating issues are that the Zero opcode is used as a
"placeholder" for unspecified optional target operands and
stores to constants are defined to be no-ops.

Code and Data Size: Current core subsystem library sizes are
shown below. These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  69.3K Code,   7.4K Data,   76.7K
Total
    Debug Version:     143.8K Code,  58.8K Data,  202.6K
Total
  Current Release:
    Non-Debug Version:  68.7K Code,   7.4K Data,   76.1K
Total
    Debug Version:     142.9K Code,  58.7K Data,  201.6K
Total


2) Linux

Added preliminary support for obtaining _TRA data for PCI
root bridges (Bjorn Helgaas).


3) iASL Compiler Version X2046:

Fixed a problem where the "_DDN" reserved name was defined
to be a control method with one argument.  There are no
arguments, and _DDN does not have to be a control method.

Fixed a problem with the Linux version of the compiler where
the source lines printed with error messages were the wrong
lines.  This turned out to be the "LF versus CR/LF"
difference between Windows and Unix.  This appears to be the
longstanding issue concerning listing output and error
messages.

Fixed a problem with the Linux version of compiler where
opcode names within error messages were wrong.  This was
caused by a slight difference in the output of the Flex tool
on Linux versus Windows.

Fixed a problem with the Linux compiler where the hex output
files contained some garbage data caused by an internal
buffer overrun.


----------------------------------------
17 May 2002.  Summary of changes for this release.


1) ACPI CA Core Subsystem Version 20020517:

Implemented a workaround to an BIOS bug discovered on the HP
OmniBook where the FADT revision number and the table size
are inconsistent (ACPI 2.0 revision vs. ACPI 1.0 table
size).  The new behavior is to fallback to using only the
ACPI 1.0 fields of the FADT if the table is too small to be
a ACPI 2.0 table as claimed by the revision number.
Although this is a BIOS bug, this is a case where the
workaround is simple enough and with no side effects, so it
seemed prudent to add it.  A warning message is issued,
however.

Implemented minimum size checks for the fixed-length ACPI
tables -- the FADT and FACS, as well as consistency checks
between the revision number and the table size.

Fixed a reported problem in the table override support where
the new table pointer was incorrectly treated as a physical
address instead of a logical address.

Eliminated the use of the AE_AML_ERROR exception and
replaced it with more descriptive codes.

Fixed a problem where an exception would occur if an ASL
Field was defined with no named Field Units underneath it
(used by some index fields).

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  68.8K Code,   7.1K Data,   75.9K
Total
    Debug Version:     142.9K Code,  58.4K Data,  201.3K
Total
  Current Release:
    Non-Debug Version:  69.3K Code,   7.4K Data,   76.7K
Total
    Debug Version:     143.8K Code,  58.8K Data,  202.6K
Total



2) Linux

Much work done on ACPI init (MADT and PCI IRQ routing
support). (Paul D. and Dominik Brodowski)

Fix PCI IRQ-related panic on boot (Sam Revitch)

Set BM_ARB_DIS when entering a sleep state (Ducrot Bruno)

Fix "MHz" typo (Dominik Brodowski)

Fix RTC year 2000 issue (Dominik Brodowski)

Preclude multiple button proc entries (Eric Brunet)

Moved arch-specific code out of include/platform/aclinux.h

3) iASL Compiler Version X2044:

Implemented error checking for the string used in the EISAID
macro (Usually used in the definition of the _HID object.)
The code now strictly enforces the PnP format - exactly 7
characters, 3 uppercase letters and 4 hex digits.

If a raw string is used in the definition of the _HID object
(instead of the EISAID macro), the string must contain all
alphanumeric characters (e.g., "*PNP0011" is not allowed
because of the asterisk.)

Implemented checking for invalid use of ACPI reserved names
for most of the name creation operators (Name, Device,
Event, Mutex, OperationRegion, PowerResource, Processor, and
ThermalZone.)  Previously, this check was only performed for
control methods.

Implemented an additional check on the Name operator to emit
an error if a reserved name that must be implemented in ASL
as a control method is used.  We know that a reserved name
must be a method if it is defined with input arguments.

The warning emitted when a namespace object reference is not
found during the cross reference phase has been changed into
an error.  The "External" directive should be used for names
defined in other modules.


4) Tools and Utilities

The 16-bit tools (adump16 and aexec16) have been regenerated
and tested.

Fixed a problem with the output of both acpidump and adump16
where the indentation of closing parentheses and brackets
was not aligned properly with the parent block.


----------------------------------------
03 May 2002.  Summary of changes for this release.


1) ACPI CA Core Subsystem Version 20020503:

Added support a new OSL interface that allows the host
operating system software to override the DSDT found in the
firmware - AcpiOsTableOverride.  With this interface, the
OSL can examine the version of the firmware DSDT and replace
it with a different one if desired.

Added new external interfaces for accessing ACPI registers
from device drivers and other system software -
AcpiGetRegister and AcpiSetRegister.  This was simply an
externalization of the existing AcpiHwBitRegister
interfaces.

Fixed a regression introduced in the previous build where
the ASL/AML CreateField operator always returned an error,
"destination must be a NS Node".

Extended the maximum time (before failure) to successfully
enable ACPI mode to 3 seconds.

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  68.5K Code,   7.0K Data,   75.5K
Total
    Debug Version:     142.4K Code,  58.3K Data,  200.7K
Total
  Current Release:
    Non-Debug Version:  68.8K Code,   7.1K Data,   75.9K
Total
    Debug Version:     142.9K Code,  58.4K Data,  201.3K
Total


2) Linux

Enhanced ACPI init code for SMP. We are now fully MPS and
$PIR-free. While 3 out of 4 of our in-house systems work
fine, the last one still hangs when testing the LAPIC timer.

Renamed many files in 2.5 kernel release to omit "acpi_"
from the name.

Added warning on boot for Presario 711FR.

Sleep improvements (Pavel Machek)

ACPI can now be built without CONFIG_PCI enabled.

IA64: Fixed memory map functions (JI Lee)


3) iASL Compiler Version X2043:

Added support to allow the compiler to be integrated into
the MS VC++ development environment for one-button
compilation of single files or entire projects -- with error-
to-source-line mapping.

Implemented support for compile-time constant folding for
the Type3, Type4, and Type5 opcodes first defined in the
ACPI 2.0 specification.  This allows the ASL writer to use
expressions instead of Integer/Buffer/String constants in
terms that must evaluate to constants at compile time and
will also simplify the emitted AML in any such sub-
expressions that can be folded (evaluated at compile-time.)
This increases the size of the compiler significantly
because a portion of the ACPI CA AML interpreter is included
within the compiler in order to pre-evaluate constant
expressions.

Fixed a problem with the "Unicode" ASL macro that caused the
compiler to fault.  (This macro is used in conjunction with
the _STR reserved name.)

Implemented an AML opcode optimization to use the Zero, One,
and Ones opcodes where possible to further reduce the size
of integer constants and thus reduce the overall size of the
generated AML code.

Implemented error checking for new reserved terms for ACPI
version 2.0A.

Implemented the -qr option to display the current list of
ACPI reserved names known to the compiler.

Implemented the -qc option to display the current list of
ASL operators that are allowed within constant expressions
and can therefore be folded at compile time if the operands
are constants.


4) Documentation

Updated the Programmer's Reference for new interfaces, data
types, and memory allocation model options.

Updated the iASL Compiler User Reference to apply new format
and add information about new features and options.

----------------------------------------
19 April 2002.  Summary of changes for this release.

1) ACPI CA Core Subsystem Version 20020419:

The source code base for the Core Subsystem has been
completely cleaned with PC-lint (FlexLint) for both 32-bit
and 64-bit versions.  The Lint option files used are
included in the /acpi/generate/lint directory.

Implemented enhanced status/error checking across the entire
Hardware manager subsystem.  Any hardware errors (reported
from the OSL) are now bubbled up and will abort a running
control method.

Fixed a problem where the per-ACPI-table integer width (32
or 64) was stored only with control method nodes, causing a
fault when non-control method code was executed during table
loading.  The solution implemented uses a global variable to
indicate table width across the entire ACPI subsystem.
Therefore, ACPI CA does not support mixed integer widths
across different ACPI tables (DSDT, SSDT).

Fixed a problem where NULL extended fields (X fields) in an
ACPI 2.0 ACPI FADT caused the table load to fail.  Although
the existing ACPI specification is a bit fuzzy on this
topic, the new behavior is to fall back on a ACPI 1.0 field
if the corresponding ACPI 2.0 X field is zero (even though
the table revision indicates a full ACPI 2.0 table.)  The
ACPI specification will be updated to clarify this issue.

Fixed a problem with the SystemMemory operation region
handler where memory was always accessed byte-wise even if
the AML-specified access width was larger than a byte.  This
caused problems on systems with memory-mapped I/O.  Memory
is now accessed with the width specified.  On systems that
do not support non-aligned transfers, a check is made to
guarantee proper address alignment before proceeding in
order to avoid an AML-caused alignment fault within the
kernel.

Fixed a problem with the ExtendedIrq resource where only one
byte of the 4-byte Irq field was extracted.

Fixed the AcpiExDigitsNeeded() procedure to support _UID.
This function was out of date and required a rewrite.

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  66.6K Code,   6.5K Data,   73.1K
Total
    Debug Version:     139.8K Code,  57.4K Data,  197.2K
Total
  Current Release:
    Non-Debug Version:  68.5K Code,   7.0K Data,   75.5K
Total
    Debug Version:     142.4K Code,  58.3K Data,  200.7K
Total


2) Linux

PCI IRQ routing fixes (Dominik Brodowski)


3) iASL Compiler Version X2042:

Implemented an additional compile-time error check for a
field unit whose size + minimum access width would cause a
run-time access beyond the end-of-region.  Previously, only
the field size itself was checked.

The Core subsystem and iASL compiler now share a common
parse object in preparation for compile-time evaluation of
the type 3/4/5 ASL operators.


----------------------------------------
Summary of changes for this release: 03_29_02

1) ACPI CA Core Subsystem Version 20020329:

Implemented support for late evaluation of TermArg operands
to Buffer and Package objects.  This allows complex
expressions to be used in the declarations of these object
types.

Fixed an ACPI 1.0 compatibility issue when reading Fields.
In ACPI 1.0, if the field was larger than 32 bits, it was
returned as a buffer – otherwise it was returned as an
integer.  In ACPI 2.0, the field is returned as a buffer
only if the field is larger than 64 bits.  The TableRevision
is now considered when making this conversion to avoid
incompatibility with existing ASL code.

Implemented logical addressing for AcpiOsGetRootPointer.
This allows an RSDP with either a logical or physical
address.  With this support, the host OS can now override
all ACPI tables with one logical RSDP.  Includes
implementation of  “typed” pointer support to allow a common
data type for both physical and logical pointers internally.
This required a change to the AcpiOsGetRootPointer
interface.

Implemented the use of ACPI 2.0 Generic Address Structures
for all GPE, Fixed Event, and PM Timer I/O.  This allows the
use of memory mapped I/O for these ACPI features.

Initialization now ignores not only non-required tables (All
tables other than the FADT, FACS, DSDT, and SSDTs), but also
does not validate the table headers of unrecognized tables.

Fixed a problem where a notify handler could only be
installed/removed on an object of type Device.  All "notify"
objects are now supported -- Devices, Processor, Power, and
Thermal.

Removed most verbosity from the ACPI_DB_INFO debug level.
Only critical information is returned when this debug level
is enabled.

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release
    Non-Debug Version:  65.4K Code,   6.2K Data,   71.6K
Total
    Debug Version:     138.0K Code,  56.6K Data,  194.6K
Total
  Current Release:
    Non-Debug Version:  66.6K Code,   6.5K Data,   73.1K
Total
    Debug Version:     139.8K Code,  57.4K Data,  197.2K
Total


2) Linux:

The processor driver (acpi_processor.c) now fully supports
ACPI 2.0-based processor performance control (e.g. Intel(R)
SpeedStep(TM) technology) Note that older laptops that only
have the Intel "applet" interface are not supported through
this.  The 'limit' and 'performance' interface (/proc) are
fully functional.  [Note that basic policy for controlling
performance state transitions will be included in the next
version of ospmd.]  The idle handler was modified to more
aggressively use C2, and PIIX4 errata handling underwent a
complete overhaul (big thanks to Dominik Brodowski).

Added support for ACPI-PCI device binding (acpi_pci_root.c).
_ADR-based devices in the ACPI namespace are now dynamically
bound (associated) with their PCI counterparts (e.g. PCI1-
>01:00.0).  This allows, among other things, ACPI to resolve
bus numbers for subordinate PCI bridges.

Enhanced PCI IRQ routing to get the proper bus number for
_PRT entries defined underneath PCI bridges.

Added IBM 600E to bad bios list due to invalid _ADR value
for PIIX4 PCI-ISA bridge, resulting in improper PCI IRQ
routing.

In the process of adding full MADT support (e.g. IOAPIC) for
IA32 (acpi.c, mpparse.c) -- stay tuned.

Added back visual differentiation between fixed-feature and
control-method buttons in dmesg.  Buttons are also subtyped
(e.g. button/power/PWRF) to simplify button identification.

We no longer use -Wno-unused when compiling debug. Please
ignore any "_THIS_MODULE defined but not used" messages.

Can now shut down the system using "magic sysrq" key.


3) iASL Compiler version 2041:

Fixed a problem where conversion errors for
hex/octal/decimal constants were not reported.

Implemented a fix for the General Register template Address
field.  This field was 8 bits when it should be 64.

Fixed a problem where errors/warnings were no longer being
emitted within the listing output file.

Implemented the ACPI 2.0A restriction on ACPI Table
Signatures to exactly 4 characters, alphanumeric only.




----------------------------------------
Summary of changes for this release: 03_08_02


1) ACPI CA Core Subsystem Version 20020308:

Fixed a problem with AML Fields where the use of the
"AccessAny" keyword could cause an interpreter error due to
attempting to read or write beyond the end of the parent
Operation Region.

Fixed a problem in the SystemMemory Operation Region handler
where an attempt was made to map memory beyond the end of
the region.  This was the root cause of the "AE_ERROR" and
"AE_NO_MEMORY" errors on some Linux systems.

Fixed a problem where the interpreter/namespace "search to
root" algorithm was not functioning for some object types.
Relaxed the internal restriction on the search to allow
upsearches for all external object types as well as most
internal types.


2) Linux:

We now use safe_halt() macro versus individual calls to sti
| hlt.

Writing to the processor limit interface should now work.
"echo 1" will increase the limit, 2 will decrease, and 0
will reset to the default.


3) ASL compiler:

Fixed segfault on Linux version.


----------------------------------------
Summary of changes for this release: 02_25_02

1) ACPI CA Core Subsystem:


Fixed a problem where the GPE bit masks were not initialized
properly, causing erratic GPE behavior.

Implemented limited support for multiple calling
conventions.  The code can be generated with either the VPL
(variable parameter list, or "C") convention, or the FPL
(fixed parameter list, or "Pascal") convention.  The core
subsystem is about 3.4% smaller when generated with FPL.


2) Linux

Re-add some /proc/acpi/event functionality that was lost
during the rewrite

Resolved issue with /proc events for fixed-feature buttons
showing up as the system device.

Fixed checks on C2/C3 latencies to be inclusive of maximum
values.

Replaced AE_ERRORs in acpi_osl.c with more specific error
codes.

Changed ACPI PRT option from "pci=noacpi-routing" to
"pci=noacpi"

Fixed limit interface & usage to fix bugs with passive
cooling hysterisis.

Restructured PRT support.


----------------------------------------
Summary of changes for this label: 02_14_02


1) ACPI CA Core Subsystem:

Implemented support in AcpiLoadTable to allow loading of
FACS and FADT tables.

Suport for the now-obsolete interim 0.71 64-bit ACPI tables
has been removed.  All 64-bit platforms should be migrated
to the ACPI 2.0 tables.  The actbl71.h header has been
removed from the source tree.

All C macros defined within the subsystem have been prefixed
with "ACPI_" to avoid collision with other system include
files.

Removed the return value for the two AcpiOsPrint interfaces,
since it is never used and causes lint warnings for ignoring
the return value.

Added error checking to all internal mutex acquire and
release calls.  Although a failure from one of these
interfaces is probably a fatal system error, these checks
will cause the immediate abort of the currently executing
method or interface.

Fixed a problem where the AcpiSetCurrentResources interface
could fault.  This was a side effect of the deployment of
the new memory allocation model.

Fixed a couple of problems with the Global Lock support
introduced in the last major build.  The "common" (1.0/2.0)
internal FACS was being overwritten with the FACS signature
and clobbering the Global Lock pointer.  Also, the actual
firmware FACS was being unmapped after construction of the
"common" FACS, preventing access to the actual Global Lock
field within it.  The "common" internal FACS is no longer
installed as an actual ACPI table; it is used simply as a
global.

Code and Data Size: Current core subsystem library sizes are
shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release (02_07_01)
    Non-Debug Version:  65.2K Code,   6.2K Data,   71.4K
Total
    Debug Version:     136.9K Code,  56.4K Data,  193.3K
Total
  Current Release:
    Non-Debug Version:  65.4K Code,   6.2K Data,   71.6K
Total
    Debug Version:     138.0K Code,  56.6K Data,  194.6K
Total


2) Linux

Updated Linux-specific code for core macro and OSL interface
changes described above.

Improved /proc/acpi/event. It now can be opened only once
and has proper poll functionality.

Fixed and restructured power management (acpi_bus).

Only create /proc "view by type" when devices of that class
exist.

Fixed "charging/discharging" bug (and others) in
acpi_battery.

Improved thermal zone code.


3) ASL Compiler, version X2039:

Implemented the new compiler restriction on ASL String
hex/octal escapes to non-null, ASCII values.  An error
results if an invalid value is used.  (This will require an
ACPI 2.0 specification change.)

AML object labels that are output to the optional C and ASM
source are now prefixed with both the ACPI table signature
and table ID to help guarantee uniqueness within a large
BIOS project.


----------------------------------------
Summary of changes for this label: 02_01_02

1) ACPI CA Core Subsystem:

ACPI 2.0 support is complete in the entire Core Subsystem
and the ASL compiler. All new ACPI 2.0 operators are
implemented and all other changes for ACPI 2.0 support are
complete.  With simultaneous code and data optimizations
throughout the subsystem, ACPI 2.0 support has been
implemented with almost no additional cost in terms of code
and data size.

Implemented a new mechanism for allocation of return
buffers.  If the buffer length is set to
ACPI_ALLOCATE_BUFFER, the buffer will be allocated on behalf
of the caller.  Consolidated all return buffer validation
and allocation to a common procedure.  Return buffers will
be allocated via the primary OSL allocation interface since
it appears that a separate pool is not needed by most users.
If a separate pool is required for these buffers, the caller
can still use the original mechanism and pre-allocate the
buffer(s).

Implemented support for string operands within the DerefOf
operator.

Restructured the Hardware and Event managers to be table
driven, simplifying the source code and reducing the amount
of generated code.

Split the common read/write low-level ACPI register bitfield
procedure into a separate read and write, simplifying the
code considerably.

Obsoleted the AcpiOsCallocate OSL interface.  This interface
was used only a handful of times and didn't have enough
critical mass for a separate interface.  Replaced with a
common calloc procedure in the core.

Fixed a reported problem with the GPE number mapping
mechanism that allows GPE1 numbers to be non-contiguous with
GPE0.  Reorganized the GPE information and shrunk a large
array that was originally large enough to hold info for all
possible GPEs (256) to simply large enough to hold all GPEs
up to the largest GPE number on the machine.

Fixed a reported problem with resource structure alignment
on 64-bit platforms.

Changed the AcpiEnableEvent and AcpiDisableEvent external
interfaces to not require any flags for the common case of
enabling/disabling a GPE.

Implemented support to allow a "Notify" on a Processor
object.

Most TBDs in comments within the source code have been
resolved and eliminated.

Fixed a problem in the interpreter where a standalone parent
prefix (^) was not handled correctly in the interpreter and
debugger.

Removed obsolete and unnecessary GPE save/restore code.

Implemented Field support in the ASL Load operator.  This
allows a table to be loaded from a named field, in addition
to loading a table directly from an Operation Region.

Implemented timeout and handle support in the external
Global Lock interfaces.

Fixed a problem in the AcpiDump utility where pathnames were
no longer being generated correctly during the dump of named
objects.

Modified the AML debugger to give a full display of if/while
predicates instead of just one AML opcode at a time.  (The
predicate can have several nested ASL statements.)  The old
method was confusing during single stepping.

Code and Data Size: Current core subsystem library sizes are
shown below. These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release (12_18_01)
     Non-Debug Version:  66.1K Code,   5.5K Data,   71.6K
Total
     Debug Version:     138.3K Code,  55.9K Data,  194.2K
Total
   Current Release:
     Non-Debug Version:  65.2K Code,   6.2K Data,   71.4K
Total
     Debug Version:     136.9K Code,  56.4K Data,  193.3K
Total

2) Linux

 Implemented fix for PIIX reverse throttling errata
(Processor driver)

Added new Limit interface (Processor and Thermal drivers)

New thermal policy (Thermal driver)

Many updates to /proc

Battery "low" event support (Battery driver)

Supports ACPI PCI IRQ routing (PCI Link and PCI root
drivers)

IA32 - IA64 initialization unification, no longer
experimental

Menuconfig options redesigned

3) ASL Compiler, version X2037:

Implemented several new output features to simplify
integration of AML code into  firmware: 1) Output the AML in
C source code with labels for each named ASL object.  The
original ASL source code is interleaved as C comments. 2)
Output the AML in ASM source code with labels and
interleaved ASL    source. 3) Output the AML in raw hex
table form, in either C or ASM.

Implemented support for optional string parameters to the
LoadTable operator.

Completed support for embedded escape sequences within
string literals.  The compiler now supports all single
character escapes as well as the Octal and Hex escapes.
Note: the insertion of a null byte into a string literal
(via the hex/octal escape) causes the string to be
immediately terminated.  A warning is issued.

Fixed a problem where incorrect AML was generated for the
case where an ASL namepath consists of a single parent
prefix (

) with no trailing name segments.

The compiler has been successfully generated with a 64-bit C
compiler.




----------------------------------------
Summary of changes for this label: 12_18_01

1) Linux

Enhanced blacklist with reason and severity fields. Any
table's signature may now be used to identify a blacklisted
system.

Call _PIC control method to inform the firmware which
interrupt model the OS is using. Turn on any disabled link
devices.

Cleaned up busmgr /proc error handling (Andreas Dilger)

 2) ACPI CA Core Subsystem:

Implemented ACPI 2.0 semantics for the "Break" operator
(Exit from while loop)

Completed implementation of the ACPI 2.0 "Continue",
"ConcatenateResTemplate", "DataTableRegion", and "LoadTable"
operators.  All new ACPI 2.0 operators are now implemented
in both the ASL compiler and the AML interpreter.  The only
remaining ACPI 2.0 task is support for the String data type
in the DerefOf operator.  Fixed a problem with AcquireMutex
where the status code was lost if the caller had to actually
wait for the mutex.

Increased the maximum ASL Field size from 64K bits to 4G
bits.

Completed implementation of the external Global Lock
interfaces -- AcpiAcquireGlobalLock and
AcpiReleaseGlobalLock.  The Timeout and Handler parameters
were added.

Completed another pass at removing warnings and issues when
compiling with 64-bit compilers.  The code now compiles
cleanly with the Intel 64-bit C/C++ compiler.  Most notably,
the pointer add and subtract (diff) macros have changed
considerably.

Created and deployed a new ACPI_SIZE type that is 64-bits
wide on 64-bit platforms, 32-bits on all others.  This type
is used wherever memory allocation and/or the C sizeof()
operator is used, and affects the OSL memory allocation
interfaces AcpiOsAllocate and AcpiOsCallocate.

Implemented sticky user breakpoints in the AML debugger.

Code and Data Size: Current core subsystem library sizes are
shown below. These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release (12_05_01)
     Non-Debug Version:  64.7K Code,   5.3K Data,   70.0K
Total
     Debug Version:     136.2K Code,  55.6K Data,  191.8K
Total
   Current Release:
     Non-Debug Version:  66.1K Code,   5.5K Data,   71.6K
Total
     Debug Version:     138.3K Code,  55.9K Data,  194.2K
Total

 3) ASL Compiler, version X2034:

Now checks for (and generates an error if detected) the use
of a Break or Continue statement without an enclosing While
statement.

Successfully generated the compiler with the Intel 64-bit C
compiler.

 ----------------------------------------
Summary of changes for this label: 12_05_01

 1) ACPI CA Core Subsystem:

The ACPI 2.0 CopyObject operator is fully implemented.  This
operator creates a new copy of an object (and is also used
to bypass the "implicit conversion" mechanism of the Store
operator.)

The ACPI 2.0 semantics for the SizeOf operator are fully
implemented.  The change is that performing a SizeOf on a
reference object causes an automatic dereference of the
object to tha actual value before the size is evaluated.
This behavior was undefined in ACPI 1.0.

The ACPI 2.0 semantics for the Extended IRQ resource
descriptor have been implemented.  The interrupt polarity
and mode are now independently set.

Fixed a problem where ASL Constants (Zero, One, Ones,
Revision) appearing in Package objects were not properly
converted to integers when the internal Package was
converted to an external object (via the AcpiEvaluateObject
interface.)

Fixed a problem with the namespace object deletion mechanism
for objects created by control methods.  There were two
parts to this problem: 1) Objects created during the
initialization phase method parse were not being deleted,
and 2) The object owner ID mechanism to track objects was
broken.

Fixed a problem where the use of the ASL Scope operator
within a control method would result in an invalid opcode
exception.

Fixed a problem introduced in the previous label where the
buffer length required for the _PRT structure was not being
returned correctly.

Code and Data Size: Current core subsystem library sizes are
shown below. These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release (11_20_01)
     Non-Debug Version:  64.1K Code,   5.3K Data,   69.4K
Total
     Debug Version:     135.1K Code,  55.4K Data,  190.5K
Total

  Current Release:
     Non-Debug Version:  64.7K Code,   5.3K Data,   70.0K
Total
     Debug Version:     136.2K Code,  55.6K Data,  191.8K
Total

 2) Linux:

Updated all files to apply cleanly against 2.4.16.

Added basic PCI Interrupt Routing Table (PRT) support for
IA32 (acpi_pci.c), and unified the PRT code for IA32 and
IA64.  This version supports both static and dyanmic PRT
entries, but dynamic entries are treated as if they were
static (not yet reconfigurable).  Architecture- specific
code to use this data is absent on IA32 but should be
available shortly.

Changed the initialization sequence to start the ACPI
interpreter (acpi_init) prior to initialization of the PCI
driver (pci_init) in init/main.c.  This ordering is required
to support PRT and facilitate other (future) enhancement.  A
side effect is that the ACPI bus driver and certain device
drivers can no longer be loaded as modules.

Modified the 'make menuconfig' options to allow PCI
Interrupt Routing support to be included without the ACPI
Bus and other device drivers.

 3) ASL Compiler, version X2033:

Fixed some issues with the use of the new CopyObject and
DataTableRegion operators.  Both are fully functional.

 ----------------------------------------
Summary of changes for this label: 11_20_01

 20 November 2001.  Summary of changes for this release.

 1) ACPI CA Core Subsystem:

Updated Index support to match ACPI 2.0 semantics.  Storing
a Integer, String, or Buffer to an Index of a Buffer will
store only the least-significant byte of the source to the
Indexed buffer byte.  Multiple writes are not performed.

Fixed a problem where the access type used in an AccessAs
ASL operator was not recorded correctly into the field
object.

Fixed a problem where ASL Event objects were created in a
signalled state. Events are now created in an unsignalled
state.

The internal object cache is now purged after table loading
and initialization to reduce the use of dynamic kernel
memory -- on the assumption that object use is greatest
during the parse phase of the entire table (versus the run-
time use of individual control methods.)

ACPI 2.0 variable-length packages are now fully operational.

Code and Data Size: Code and Data optimizations have
permitted new feature development with an actual reduction
in the library size.  Current core subsystem library sizes
are shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release (11_09_01):
     Non-Debug Version:  63.7K Code,   5.2K Data,   68.9K
Total
     Debug Version:     134.5K Code,  55.4K Data,  189.9K
Total

  Current Release:
     Non-Debug Version:  64.1K Code,   5.3K Data,   69.4K
Total
     Debug Version:     135.1K Code,  55.4K Data,  190.5K
Total

 2) Linux:

Enhanced the ACPI boot-time initialization code to allow the
use of Local APIC tables for processor enumeration on IA-32,
and to pave the way for a fully MPS-free boot (on SMP
systems) in the near future.  This functionality replaces
arch/i386/kernel/acpitables.c, which was introduced in an
earlier 2.4.15-preX release.  To enable this feature you
must add "acpi_boot=on" to the kernel command line -- see
the help entry for CONFIG_ACPI_BOOT for more information.
An IA-64 release is in the works...

Restructured the configuration options to allow boot-time
table parsing support without inclusion of the ACPI
Interpreter (and other) code.

NOTE: This release does not include fixes for the reported
events, power-down, and thermal passive cooling issues
(coming soon).

 3) ASL Compiler:

Added additional typechecking for Fields within restricted
access Operation Regions.  All fields within EC and CMOS
regions must be declared with ByteAcc. All fields withing
SMBus regions must be declared with the BufferAcc access
type.

Fixed a problem where the listing file output of control
methods no longer interleaved the actual AML code with the
ASL source code.



----------------------------------------
Summary of changes for this label: 11_09_01

1) ACPI CA Core Subsystem:

Implemented ACPI 2.0-defined support for writes to fields
with a Buffer, String, or Integer source operand that is
smaller than the target field. In these cases, the source
operand is zero-extended to fill the target field.

Fixed a problem where a Field starting bit offset (within
the parent operation region) was calculated incorrectly if
the alignment of the field differed from the access width.
This affected CreateWordField, CreateDwordField,
CreateQwordField, and possibly other fields that use the
"AccessAny" keyword.

Fixed a problem introduced in the 11_02_01 release where
indirect stores through method arguments did not operate
correctly.

2) Linux:

Implemented boot-time ACPI table parsing support
(CONFIG_ACPI_BOOT) for IA32 and IA64 UP/SMP systems.  This
code facilitates the use of ACPI tables (e.g. MADT, SRAT)
rather than legacy BIOS interfaces (e.g. MPS) for the
configuration of system processors, memory, and interrupts
during setup_arch().  Note that this patch does not include
the required architecture-specific changes required to apply
this information -- subsequent patches will be posted for
both IA32 and IA64 to achieve this.

Added low-level sleep support for IA32 platforms, courtesy
of Pat Mochel. This allows IA32 systems to transition
to/from various sleeping states (e.g. S1, S3), although the
lack of a centralized driver model and power-manageable
drivers will prevent its (successful) use on most systems.

Revamped the ACPI 'menuconfig' layout: created new "ACPI
Support" submenu, unified IA32 and IA64 options, added new
"Boot using ACPI tables" option, etc.

Increased the default timeout for the EC driver from 1ms to
10ms (1000 cycles of 10us) to try to address AE_TIME errors
during EC transactions.

 ----------------------------------------
Summary of changes for this label: 11_02_01

1) ACPI CA Core Subsystem:

ACPI 2.0 Support: Implemented ACPI 2.0 64-bit Field access
(QWordAcc keyword). All ACPI 2.0 64-bit support is now
implemented.

OSL Interfaces: Several of the OSL (AcpiOs*) interfaces
required changes to support ACPI 2.0 Qword field access.
Read/Write PciConfiguration(), Read/Write Memory(), and
Read/Write Port() now accept an ACPI_INTEGER (64 bits) as
the value parameter.  Also, the value parameter for the
address space handler interface is now an ACPI_INTEGER.  OSL
implementations of these interfaces must now handle the case
where the Width parameter is 64.

Index Fields: Fixed a problem where unaligned bit assembly
and disassembly for IndexFields was not supported correctly.

Index and Bank Fields:  Nested Index and Bank Fields are now
supported. During field access, a check is performed to
ensure that the value written to an Index or Bank register
is not out of the range of the register.  The Index (or
Bank) register is written before each access to the field
data. Future support will include allowing individual
IndexFields to be wider than the DataRegister width.

Fields: Fixed a problem where the AML interpreter was
incorrectly attempting to write beyond the end of a
Field/OpRegion.  This was a boundary case that occurred when
a DWORD field was written to a BYTE access OpRegion, forcing
multiple writes and causing the interpreter to write one
datum too many.

Fields: Fixed a problem with Field/OpRegion access where the
starting bit address of a field was incorrectly calculated
if the current access type was wider than a byte (WordAcc,
DwordAcc, or QwordAcc).

Fields: Fixed a problem where forward references to
individual FieldUnits (individual Field names within a Field
definition) were not resolved during the AML table load.

Fields: Fixed a problem where forward references from a
Field definition to the parent Operation Region definition
were not resolved during the AML table load.

Fields: Duplicate FieldUnit names within a scope are now
detected during AML table load.

Acpi Interfaces: Fixed a problem where the AcpiGetName()
interface returned an incorrect name for the root node.

Code and Data Size: Code and Data optimizations have
permitted new feature development with an actual reduction
in the library size.  Current core subsystem library sizes
are shown below.  These are the code and data sizes for the
acpica.lib produced by the Microsoft Visual C++ 6.0
compiler, and these values do not include any ACPI driver or
OSPM code.  The debug version of the code includes the debug
output trace mechanism and has a larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Previous Release (10_18_01):
     Non-Debug Version:  63.9K Code,   5.1K Data,   69.0K
Total
     Debug Version:     136.7K Code,  57.4K Data,  194.2K
Total

  Current Release:
     Non-Debug Version:  63.7K Code,   5.2K Data,   68.9K
Total
     Debug Version:     134.5K Code,  55.4K Data,  189.9K
Total

 2) Linux:

Improved /proc processor output (Pavel Machek) Re-added
MODULE_LICENSE("GPL") to all modules.

 3) ASL Compiler version X2030:

Duplicate FieldUnit names within a scope are now detected
and flagged as errors.

 4) Documentation:

Programmer Reference updated to reflect OSL and address
space handler interface changes described above.

----------------------------------------
Summary of changes for this label: 10_18_01

ACPI CA Core Subsystem:

Fixed a problem with the internal object reference count
mechanism that occasionally caused premature object
deletion. This resolves all of the outstanding problem
reports where an object is deleted in the middle of an
interpreter evaluation.  Although this problem only showed
up in rather obscure cases, the solution to the problem
involved an adjustment of all reference counts involving
objects attached to namespace nodes.

Fixed a problem with Field support in the interpreter where
writing to an aligned field whose length is an exact
multiple (2 or greater) of the field access granularity
would cause an attempt to write beyond the end of the field.

The top level AML opcode execution functions within the
interpreter have been renamed with a more meaningful and
consistent naming convention.  The modules exmonad.c and
exdyadic.c were eliminated.  New modules are exoparg1.c,
exoparg2.c, exoparg3.c, and exoparg6.c.

Support for the ACPI 2.0 "Mid" ASL operator has been
implemented.

Fixed a problem where the AML debugger was causing some
internal objects to not be deleted during subsystem
termination.

Fixed a problem with the external AcpiEvaluateObject
interface where the subsystem would fault if the named
object to be evaluated refered to a constant such as Zero,
Ones, etc.

Fixed a problem with IndexFields and BankFields where the
subsystem would fault if the index, data, or bank registers
were not defined in the same scope as the field itself.

Added printf format string checking for compilers that
support this feature.  Corrected more than 50 instances of
issues with format specifiers within invocations of
ACPI_DEBUG_PRINT throughout the core subsystem code.

The ASL "Revision" operator now returns the ACPI support
level implemented in the core - the value "2" since the ACPI
2.0 support is more than 50% implemented.

Enhanced the output of the AML debugger "dump namespace"
command to output in a more human-readable form.

Current core subsystem library code sizes are shown below.
These are the code and data sizes for the acpica.lib
produced by the Microsoft Visual C++ 6.0 compiler, and these
values do not include any ACPI driver or OSPM code.  The
debug version of the code includes the full debug trace
mechanism -- leading to a much larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

     Previous Label (09_20_01):
     Non-Debug Version:    65K Code,     5K Data,     70K
Total
     Debug Version:       138K Code,    58K Data,    196K
Total

     This Label:
     Non-Debug Version:  63.9K Code,   5.1K Data,   69.0K
Total
     Debug Version:     136.7K Code,  57.4K Data,  194.2K
Total

Linux:

Implemented a "Bad BIOS Blacklist" to track machines that
have known ASL/AML problems.

Enhanced the /proc interface for the thermal zone driver and
added support for _HOT (the critical suspend trip point).
The 'info' file now includes threshold/policy information,
and allows setting of _SCP (cooling preference) and _TZP
(polling frequency) values to the 'info' file. Examples:
"echo tzp=5 > info" sets the polling frequency to 5 seconds,
and "echo scp=1 > info" sets the cooling preference to the
passive/quiet mode (if supported by the ASL).

Implemented a workaround for a gcc bug that resuted in an
OOPs when loading the control method battery driver.

 ----------------------------------------
Summary of changes for this label: 09_20_01

 ACPI CA Core Subsystem:

The AcpiEnableEvent and AcpiDisableEvent interfaces have
been modified to allow individual GPE levels to be flagged
as wake-enabled (i.e., these GPEs are to remain enabled when
the platform sleeps.)

The AcpiEnterSleepState and AcpiLeaveSleepState interfaces
now support wake-enabled GPEs.  This means that upon
entering the sleep state, all GPEs that are not wake-enabled
are disabled.  When leaving the sleep state, these GPEs are
reenabled.

A local double-precision divide/modulo module has been added
to enhance portability to OS kernels where a 64-bit math
library is not available.  The new module is "utmath.c".

Several optimizations have been made to reduce the use of
CPU stack.  Originally over 2K, the maximum stack usage is
now below 2K at 1860  bytes (1.82k)

Fixed a problem with the AcpiGetFirmwareTable interface
where the root table pointer was not mapped into a logical
address properly.

Fixed a problem where a NULL pointer was being dereferenced
in the interpreter code for the ASL Notify operator.

Fixed a problem where the use of the ASL Revision operator
returned an error. This operator now returns the current
version of the ACPI CA core subsystem.

Fixed a problem where objects passed as control method
parameters to AcpiEvaluateObject were always deleted at
method termination.  However, these objects may end up being
stored into the namespace by the called method.  The object
reference count mechanism was applied to these objects
instead of a force delete.

Fixed a problem where static strings or buffers (contained
in the AML code) that are declared as package elements
within the ASL code could cause a fault because the
interpreter would attempt to delete them.  These objects are
now marked with the "static object" flag to prevent any
attempt to delete them.

Implemented an interpreter optimization to use operands
directly from the state object instead of extracting the
operands to local variables.  This reduces stack use and
code size, and improves performance.

The module exxface.c was eliminated as it was an unnecessary
extra layer of code.

Current core subsystem library code sizes are shown below.
These are the code and data sizes for the acpica.lib
produced by the Microsoft Visual C++ 6.0 compiler, and these
values do not include any ACPI driver or OSPM code.  The
debug version of the code includes the full debug trace
mechanism -- leading to a much larger code and data size.
Note that these values will vary depending on the efficiency
of the compiler and the compiler options used during
generation.

  Non-Debug Version:  65K Code,   5K Data,   70K Total
(Previously 69K)   Debug Version:     138K Code,  58K Data,
196K Total  (Previously 195K)

Linux:

Support for ACPI 2.0 64-bit integers has been added.   All
ACPI Integer objects are now 64 bits wide

All Acpi data types and structures are now in lower case.
Only Acpi macros are upper case for differentiation.

 Documentation:

Changes to the external interfaces as described above.

 ----------------------------------------
Summary of changes for this label: 08_31_01

 ACPI CA Core Subsystem:

A bug with interpreter implementation of the ASL Divide
operator was found and fixed.  The implicit function return
value (not the explicit store operands) was returning the
remainder instead of the quotient.  This was a longstanding
bug and it fixes several known outstanding issues on various
platforms.

The ACPI_DEBUG_PRINT and function trace entry/exit macros
have been further optimized for size.  There are 700
invocations of the DEBUG_PRINT macro alone, so each
optimization reduces the size of the debug version of the
subsystem significantly.

A stack trace mechanism has been implemented.  The maximum
stack usage is about 2K on 32-bit platforms.  The debugger
command "stat stack" will display the current maximum stack
usage.

All public symbols and global variables within the subsystem
are now prefixed with the string "Acpi".  This keeps all of
the symbols grouped together in a kernel map, and avoids
conflicts with other kernel subsystems.

Most of the internal fixed lookup tables have been moved
into the code segment via the const operator.

Several enhancements have been made to the interpreter to
both reduce the code size and improve performance.

Current core subsystem library code sizes are shown below.
These are the code and data sizes for the acpica.lib
produced by the Microsoft Visual C++ 6.0 compiler, and these
values do not include any ACPI driver or OSPM code.  The
debug version of the code includes the full debug trace
mechanism which contains over 700 invocations of the
DEBUG_PRINT macro, 500 function entry macro invocations, and
over 900 function exit macro invocations -- leading to a
much larger code and data size.  Note that these values will
vary depending on the efficiency of the compiler and the
compiler options used during generation.

        Non-Debug Version:  64K Code,   5K Data,   69K Total
Debug Version:     137K Code,  58K Data,  195K Total

 Linux:

Implemented wbinvd() macro, pending a kernel-wide
definition.

Fixed /proc/acpi/event to handle poll() and short reads.

 ASL Compiler, version X2026:

Fixed a problem introduced in the previous label where the
AML code emitted for package objects produced packages with
zero length.

 ----------------------------------------
Summary of changes for this label: 08_16_01

ACPI CA Core Subsystem:

The following ACPI 2.0 ASL operators have been implemented
in the AML interpreter (These are already supported by the
Intel ASL compiler):  ToDecimalString, ToHexString,
ToString, ToInteger, and ToBuffer.  Support for 64-bit AML
constants is implemented in the AML parser, debugger, and
disassembler.

The internal memory tracking mechanism (leak detection code)
has been upgraded to reduce the memory overhead (a separate
tracking block is no longer allocated for each memory
allocation), and now supports all of the internal object
caches.

The data structures and code for the internal object caches
have been coelesced and optimized so that there is a single
cache and memory list data structure and a single group of
functions that implement generic cache management.  This has
reduced the code size in both the debug and release versions
of the subsystem.

The DEBUG_PRINT macro(s) have been optimized for size and
replaced by ACPI_DEBUG_PRINT.  The syntax for this macro is
slightly different, because it generates a single call to an
internal function.  This results in a savings of about 90
bytes per invocation, resulting in an overall code and data
savings of about 16% in the debug version of the subsystem.

 Linux:

Fixed C3 disk corruption problems and re-enabled C3 on
supporting machines.

Integrated low-level sleep code by Patrick Mochel.

Further tweaked source code Linuxization.

Other minor fixes.

 ASL Compiler:

Support for ACPI 2.0 variable length packages is
fixed/completed.

Fixed a problem where the optional length parameter for the
ACPI 2.0 ToString operator.

Fixed multiple extraneous error messages when a syntax error
is detected within the declaration line of a control method.

 ----------------------------------------
Summary of changes for this label: 07_17_01

ACPI CA Core Subsystem:

Added a new interface named AcpiGetFirmwareTable to obtain
any ACPI table via the ACPI signature.  The interface can be
called at any time during kernel initialization, even before
the kernel virtual memory manager is initialized and paging
is enabled.  This allows kernel subsystems to obtain ACPI
tables very early, even before the ACPI CA subsystem is
initialized.

Fixed a problem where Fields defined with the AnyAcc
attribute could be resolved to the incorrect address under
the following conditions: 1) the field width is larger than
8 bits and 2) the parent operation region is not defined on
a DWORD boundary.

Fixed a problem where the interpreter is not being locked
during namespace initialization (during execution of the
_INI control methods), causing an error when an attempt is
made to release it later.

ACPI 2.0 support in the AML Interpreter has begun and will
be ongoing throughout the rest of this year.  In this label,
The Mod operator is implemented.

Added a new data type to contain full PCI addresses named
ACPI_PCI_ID. This structure contains the PCI Segment, Bus,
Device, and Function values.

 Linux:

Enhanced the Linux version of the source code to change most
capitalized ACPI type names to lowercase. For example, all
instances of ACPI_STATUS are changed to acpi_status.  This
will result in a large diff, but the change is strictly
cosmetic and aligns the CA code closer to the Linux coding
standard.

OSL Interfaces:

The interfaces to the PCI configuration space have been
changed to add the PCI Segment number and to split the
single 32-bit combined DeviceFunction field into two 16-bit
fields.  This was accomplished by moving the four values
that define an address in PCI configuration space (segment,
bus, device, and function) to the new ACPI_PCI_ID structure.

The changes to the PCI configuration space interfaces led to
a reexamination of the complete set of address space access
interfaces for PCI, I/O, and Memory.  The previously
existing 18 interfaces have proven difficult to maintain
(any small change must be propagated across at least 6
interfaces) and do not easily allow for future expansion to
64 bits if necessary.  Also, on some systems, it would not
be appropriate to demultiplex the access width (8, 16, 32,or
64) before calling the OSL if the corresponding native OS
interfaces contain a similar access width parameter.  For
these reasons, the 18 address space interfaces have been
replaced by these 6 new ones:

AcpiOsReadPciConfiguration
AcpiOsWritePciConfiguration
AcpiOsReadMemory
AcpiOsWriteMemory
AcpiOsReadPort
AcpiOsWritePort

Added a new interface named AcpiOsGetRootPointer to allow
the OSL to perform the platform and/or OS-specific actions
necessary to obtain the ACPI RSDP table pointer.  On IA-32
platforms, this interface will simply call down to the CA
core to perform the low-memory search for the table.  On IA-
64, the RSDP is obtained from EFI.  Migrating this interface
to the OSL allows the CA core to remain OS and platform
independent.

Added a new interface named AcpiOsSignal to provide a
generic "function code and pointer" interface for various
miscellaneous signals and notifications that must be made to
the host OS.   The first such signals are intended to
support the ASL Fatal and Breakpoint operators.  In the
latter case, the AcpiOsBreakpoint interface has been
obsoleted.

The definition of the AcpiFormatException interface has been
changed to simplify its use.  The caller no longer must
supply a buffer to the call; A pointer to a const string is
now returned directly.  This allows the call to be easily
used in printf statements, etc. since the caller does not
have to manage a local buffer.

 ASL Compiler, Version X2025:

The ACPI 2.0 Switch/Case/Default operators have been
implemented and are fully functional.  They will work with
all ACPI 1.0 interpreters, since the operators are simply
translated to If/Else pairs.

The ACPI 2.0 ElseIf operator is implemented and will also
work with 1.0 interpreters, for the same reason.

Implemented support for ACPI 2.0 variable-length packages.
These packages have a separate opcode, and their size is
determined by the interpreter at run-time.

Documentation The ACPI CA Programmer Reference has been
updated to reflect the new interfaces and changes to
existing interfaces.

 ------------------------------------------
Summary of changes for this label: 06_15_01

 ACPI CA Core Subsystem:

Fixed a problem where a DWORD-accessed field within a Buffer
object would get its byte address inadvertently rounded down
to the nearest DWORD.  Buffers are always Byte-accessible.

 ASL Compiler, version X2024:

Fixed a problem where the Switch() operator would either
fault or hang the compiler.  Note however, that the AML code
for this ACPI 2.0 operator is not yet implemented.

Compiler uses the new AcpiOsGetTimer interface to obtain
compile timings.

Implementation of the CreateField operator automatically
converts a reference to a named field within a resource
descriptor from a byte offset to a bit offset if required.

Added some missing named fields from the resource descriptor
support. These are the names that are automatically created
by the compiler to reference fields within a descriptor.
They are only valid at compile time and are not passed
through to the AML interpreter.

Resource descriptor named fields are now typed as Integers
and subject to compile-time typechecking when used in
expressions.

 ------------------------------------------
Summary of changes for this label: 05_18_01

 ACPI CA Core Subsystem:

Fixed a couple of problems in the Field support code where
bits from adjacent fields could be returned along with the
proper field bits. Restructured the field support code to
improve performance, readability and maintainability.

New DEBUG_PRINTP macro automatically inserts the procedure
name into the output, saving hundreds of copies of procedure
name strings within the source, shrinking the memory
footprint of the debug version of the core subsystem.

 Source Code Structure:

The source code directory tree was restructured to reflect
the current organization of the component architecture.
Some files and directories have been moved and/or renamed.

 Linux:

Fixed leaking kacpidpc processes.

Fixed queueing event data even when /proc/acpi/event is not
opened.

 ASL Compiler, version X2020:

Memory allocation performance enhancement - over 24X compile
time improvement on large ASL files.  Parse nodes and
namestring buffers are now allocated from a large internal
compiler buffer.

The temporary .SRC file is deleted unless the "-s" option is
specified

The "-d" debug output option now sends all output to the
.DBG file instead of the console.

"External" second parameter is now optional

"ElseIf" syntax now properly allows the predicate

Last operand to "Load" now recognized as a Target operand

Debug object can now be used anywhere as a normal object.

ResourceTemplate now returns an object of type BUFFER

EISAID now returns an object of type INTEGER

"Index" now works with a STRING operand

"LoadTable" now accepts optional parameters

"ToString" length parameter is now optional

"Interrupt (ResourceType," parse error fixed.

"Register" with a user-defined region space parse error
fixed

Escaped backslash at the end of a string ("\\") scan/parse
error fixed

"Revision" is now an object of type INTEGER.



------------------------------------------
Summary of changes for this label: 05_02_01

Linux:

/proc/acpi/event now blocks properly.

Removed /proc/sys/acpi. You can still dump your DSDT from
/proc/acpi/dsdt.

 ACPI CA Core Subsystem:

Fixed a problem introduced in the previous label where some
of the "small" resource descriptor types were not
recognized.

Improved error messages for the case where an ASL Field is
outside the range of the parent operation region.

 ASL Compiler, version X2018:

Added error detection for ASL Fields that extend beyond the
length of the parent operation region (only if the length of
the region is known at compile time.)  This includes fields
that have a minimum access width that is smaller than the
parent region, and individual field units that are partially
or entirely beyond the extent of the parent.



------------------------------------------
Summary of changes for this label: 04_27_01

 ACPI CA Core Subsystem:

Fixed a problem where the namespace mutex could be released
at the wrong time during execution of
AcpiRemoveAddressSpaceHandler.

Added optional thread ID output for debug traces, to
simplify debugging of multiple threads.  Added context
switch notification when the debug code realizes that a
different thread is now executing ACPI code.

Some additional external data types have been prefixed with
the string "ACPI_" for consistency.  This may effect
existing code.  The data types affected are the external
callback typedefs - e.g., WALK_CALLBACK becomes
ACPI_WALK_CALLBACK.

 Linux:

Fixed an issue with the OSL semaphore implementation where a
thread was waking up with an error from receiving a SIGCHLD
signal.

Linux version of ACPI CA now uses the system C library for
string manipulation routines instead of a local
implementation.

Cleaned up comments and removed TBDs.

 ASL Compiler, version X2017:

Enhanced error detection and reporting for all file I/O
operations.

 Documentation:

Programmer Reference updated to version 1.06.



------------------------------------------
Summary of changes for this label: 04_13_01

 ACPI CA Core Subsystem:

Restructured support for BufferFields and RegionFields.
BankFields support is now fully operational.  All known 32-
bit limitations on field sizes have been removed.  Both
BufferFields and (Operation) RegionFields are now supported
by the same field management code.

Resource support now supports QWORD address and IO
resources. The 16/32/64 bit address structures and the
Extended IRQ structure have been changed to properly handle
Source Resource strings.

A ThreadId of -1 is now used to indicate a "mutex not
acquired" condition internally and must never be returned by
AcpiOsThreadId. This reserved value was changed from 0 since
Unix systems allow a thread ID of 0.

Linux:

Driver code reorganized to enhance portability

Added a kernel configuration option to control ACPI_DEBUG

Fixed the EC driver to honor _GLK.

ASL Compiler, version X2016:

Fixed support for the "FixedHw" keyword.  Previously, the
FixedHw address space was set to 0, not 0x7f as it should
be.

 ------------------------------------------
Summary of changes for this label: 03_13_01

 ACPI CA Core Subsystem:

During ACPI initialization, the _SB_._INI method is now run
if present.

Notify handler fix - notifies are deferred until the parent
method completes execution.  This fixes the "mutex already
acquired" issue seen occasionally.

Part of the "implicit conversion" rules in ACPI 2.0 have
been found to cause compatibility problems with existing
ASL/AML.  The convert "result-to-target-type" implementation
has been removed for stores to method Args and Locals.
Source operand conversion is still fully implemented.
Possible changes to ACPI 2.0 specification pending.

Fix to AcpiRsCalculatePciRoutingTableLength to return
correct length.

Fix for compiler warnings for 64-bit compiles.

 Linux:

/proc output aligned for easier parsing.

Release-version compile problem fixed.

New kernel configuration options documented in
Configure.help.

IBM 600E - Fixed Sleep button may generate "Invalid <NULL>
context" message.

 OSPM:

Power resource driver integrated with bus manager.

Fixed kernel fault during active cooling for thermal zones.

Source Code:

The source code tree has been restructured.



------------------------------------------
Summary of changes for this label: 03_02_01

 Linux OS Services Layer (OSL):

Major revision of all Linux-specific code.

Modularized all ACPI-specific drivers.

Added new thermal zone and power resource drivers.

Revamped /proc interface (new functionality is under
/proc/acpi).

New kernel configuration options.

 Linux known issues:

New kernel configuration options not documented in
Configure.help yet.

Module dependencies not currently implemented. If used, they
should be loaded in this order: busmgr, power, ec, system,
processor, battery, ac_adapter, button, thermal.

Modules will not load if CONFIG_MODVERSION is set.

IBM 600E - entering S5 may reboot instead of shutting down.

IBM 600E - Sleep button may generate "Invalid <NULL>
context" message.

Some systems may fail with "execution mutex already
acquired" message.

 ACPI CA Core Subsystem:

Added a new OSL Interface, AcpiOsGetThreadId.  This was
required for the  deadlock detection code. Defined to return
a non-zero, 32-bit thread ID for the currently executing
thread.  May be a non-zero constant integer on single-thread
systems.

Implemented deadlock detection for internal subsystem
mutexes.  We may add conditional compilation for this code
(debug only) later.

ASL/AML Mutex object semantics are now fully supported.
This includes multiple acquires/releases by owner and
support for the Mutex SyncLevel parameter.

A new "Force Release" mechanism automatically frees all ASL
Mutexes that have been acquired but not released when a
thread exits the interpreter.  This forces conformance to
the ACPI spec ("All mutexes must be released when an
invocation exits") and prevents deadlocked ASL threads.
This mechanism can be expanded (later) to monitor other
resource acquisitions if OEM ASL code continues to misbehave
(which it will).

Several new ACPI exception codes have been added for the
Mutex support.

Recursive method calls are now allowed and supported (the
ACPI spec does in fact allow recursive method calls.)  The
number of recursive calls is subject to the restrictions
imposed by the SERIALIZED method keyword and SyncLevel (ACPI
2.0) method parameter.

Implemented support for the SyncLevel parameter for control
methods (ACPI 2.0 feature)

Fixed a deadlock problem when multiple threads attempted to
use the interpreter.

Fixed a problem where the string length of a String package
element was not always set in a package returned from
AcpiEvaluateObject.

Fixed a problem where the length of a String package element
was not always included in the length of the overall package
returned from AcpiEvaluateObject.

Added external interfaces (Acpi*) to the ACPI debug memory
manager.  This manager keeps a list of all outstanding
allocations, and can therefore detect memory leaks and
attempts to free memory blocks more than once. Useful for
code such as the power manager, etc.  May not be appropriate
for device drivers.  Performance with the debug code enabled
is slow.

The ACPI Global Lock is now an optional hardware element.

 ASL Compiler Version X2015:

Integrated changes to allow the compiler to be generated on
multiple platforms.

Linux makefile added to generate the compiler on Linux

 Source Code:

All platform-specific headers have been moved to their own
subdirectory, Include/Platform.

New source file added, Interpreter/ammutex.c

New header file, Include/acstruct.h

 Documentation:

The programmer reference has been updated for the following
new interfaces: AcpiOsGetThreadId AcpiAllocate AcpiCallocate
AcpiFree

 ------------------------------------------
Summary of changes for this label: 02_08_01

Core ACPI CA Subsystem: Fixed a problem where an error was
incorrectly returned if the return resource buffer was
larger than the actual data (in the resource interfaces).

References to named objects within packages are resolved to
the full pathname string before packages are returned
directly (via the AcpiEvaluateObject interface) or
indirectly via the resource interfaces.

Linux OS Services Layer (OSL):

Improved /proc battery interface.


Added C-state debugging output and other miscellaneous
fixes.

ASL Compiler Version X2014:

All defined method arguments can now be used as local
variables, including the ones that are not actually passed
in as parameters.  The compiler tracks initialization of the
arguments and issues an exception if they are used without
prior assignment (just like locals).

The -o option now specifies a filename prefix that is used
for all output files, including the AML output file.
Otherwise, the default behavior is as follows:  1) the AML
goes to the file specified in the DSDT.  2) all other output
files use the input source filename as the base.

 ------------------------------------------
Summary of changes for this label: 01_25_01

Core ACPI CA Subsystem: Restructured the implementation of
object store support within the  interpreter.  This includes
support for the Store operator as well  as any ASL operators
that include a target operand.

Partially implemented support for Implicit Result-to-Target
conversion. This is when a result object is converted on the
fly to the type of  an existing target object.  Completion
of this support is pending  further analysis of the ACPI
specification concerning this matter.

CPU-specific code has been removed from the subsystem
(hardware directory).

New Power Management Timer functions added

Linux OS Services Layer (OSL): Moved system state transition
code to the core, fixed it, and modified  Linux OSL
accordingly.

Fixed C2 and C3 latency calculations.


We no longer use the compilation date for the version
message on  initialization, but retrieve the version from
AcpiGetSystemInfo().

Incorporated for fix Sony VAIO machines.

Documentation:  The Programmer Reference has been updated
and reformatted.


ASL Compiler:  Version X2013: Fixed a problem where the line
numbering and error reporting could get out  of sync in the
presence of multiple include files.

 ------------------------------------------
Summary of changes for this label: 01_15_01

Core ACPI CA Subsystem:

Implemented support for type conversions in the execution of
the ASL  Concatenate operator (The second operand is
converted to match the type  of the first operand before
concatenation.)

Support for implicit source operand conversion is partially
implemented.   The ASL source operand types Integer, Buffer,
and String are freely  interchangeable for most ASL
operators and are converted by the interpreter  on the fly
as required.  Implicit Target operand conversion (where the
result is converted to the target type before storing) is
not yet implemented.

Support for 32-bit and 64-bit BCD integers is implemented.

Problem fixed where a field read on an aligned field could
cause a read  past the end of the field.

New exception, AE_AML_NO_RETURN_VALUE, is returned when a
method does not return a value, but the caller expects one.
(The ASL compiler flags this as a warning.)

ASL Compiler:

Version X2011:
1. Static typechecking of all operands is implemented. This
prevents the use of invalid objects (such as using a Package
where an Integer is required) at compile time instead of at
interpreter run-time.
2. The ASL source line is printed with ALL errors and
warnings.
3. Bug fix for source EOF without final linefeed.
4. Debug option is split into a parse trace and a namespace
trace.
5. Namespace output option (-n) includes initial values for
integers and strings.
6. Parse-only option added for quick syntax checking.
7. Compiler checks for duplicate ACPI name declarations

Version X2012:
1. Relaxed typechecking to allow interchangeability between
strings, integers, and buffers.  These types are now
converted by the interpreter at runtime.
2. Compiler reports time taken by each internal subsystem in
the debug         output file.


 ------------------------------------------
Summary of changes for this label: 12_14_00

ASL Compiler:

This is the first official release of the compiler. Since
the compiler requires elements of the Core Subsystem, this
label synchronizes everything.

------------------------------------------
Summary of changes for this label: 12_08_00

Fixed a problem where named references within the ASL
definition of both OperationRegions and CreateXXXFields did
not work properly.  The symptom was an AE_AML_OPERAND_TYPE
during initialization of the region/field. This is similar
(but not related internally) to the problem that was fixed
in the last label.

Implemented both 32-bit and 64-bit support for the BCD ASL
functions ToBCD and FromBCD.

Updated all legal headers to include "2000" in the copyright
years.

 ------------------------------------------
Summary of changes for this label: 12_01_00

Fixed a problem where method invocations within the ASL
definition of both OperationRegions and CreateXXXFields did
not work properly.  The symptom was an AE_AML_OPERAND_TYPE
during initialization of the region/field:

  nsinit-0209: AE_AML_OPERAND_TYPE while getting region
arguments [DEBG]   ammonad-0284: Exec_monadic2_r/Not: bad
operand(s) (0x3005)

Fixed a problem where operators with more than one nested
subexpression would fail.  The symptoms were varied, by
mostly AE_AML_OPERAND_TYPE errors.  This was actually a
rather serious problem that has gone unnoticed until now.

  Subtract (Add (1,2), Multiply (3,4))

Fixed a problem where AcpiGetHandle didn't quite get fixed
in the previous build (The prefix part of a relative path
was handled incorrectly).

Fixed a problem where Operation Region initialization failed
if the operation region name was a "namepath" instead of a
simple "nameseg". Symptom was an AE_NO_OPERAND error.

Fixed a problem where an assignment to a local variable via
the indirect RefOf mechanism only worked for the first such
assignment.  Subsequent assignments were ignored.

 ------------------------------------------
Summary of changes for this label: 11_15_00

ACPI 2.0 table support with backwards support for ACPI 1.0
and the 0.71 extensions.  Note: although we can read ACPI
2.0 BIOS tables, the AML  interpreter does NOT have support
for the new 2.0 ASL grammar terms at this time.

All ACPI hardware access is via the GAS structures in the
ACPI 2.0 FADT.

All physical memory addresses across all platforms are now
64 bits wide. Logical address width remains dependent on the
platform (i.e., "void *").

AcpiOsMapMemory interface changed to a 64-bit physical
address.

The AML interpreter integer size is now 64 bits, as per the
ACPI 2.0 specification.

For backwards compatibility with ACPI 1.0, ACPI tables with
a revision number less than 2 use 32-bit integers only.

Fixed a problem where the evaluation of OpRegion operands
did not always resolve them to numbers properly.

------------------------------------------
Summary of changes for this label: 10_20_00

Fix for CBN_._STA issue.  This fix will allow correct access
to CBN_ OpRegions when the _STA returns 0x8.

Support to convert ACPI constants (Ones, Zeros, One) to
actual values before a package object is returned

Fix for method call as predicate to if/while construct
causing incorrect if/while behavior

Fix for Else block package lengths sometimes calculated
wrong (if block > 63 bytes)

Fix for Processor object length field, was always zero

Table load abort if FACP sanity check fails

Fix for problem with Scope(name) if name already exists

Warning emitted if a named object referenced cannot be found
(resolved) during method execution.





------------------------------------------
Summary of changes for this label: 9_29_00

New table initialization interfaces: AcpiInitializeSubsystem
no longer has any parameters AcpiFindRootPointer - Find the
RSDP (if necessary) AcpiLoadTables (RSDP) - load all tables
found at RSDP->RSDT Obsolete Interfaces
AcpiLoadFirmwareTables - replaced by AcpiLoadTables

Note: These interface changes require changes to all
existing OSDs

The PCI_Config default address space handler is always
installed at the root namespace object.

-------------------------------------------
Summary of changes for this label: 09_15_00

The new initialization architecture is implemented.  New
interfaces are: AcpiInitializeSubsystem (replaces
AcpiInitialize) AcpiEnableSubsystem Obsolete Interfaces:
AcpiLoadNamespace (Namespace is automatically loaded when a
table is loaded)

The ACPI_OPERAND_OBJECT has been optimized to shrink its
size from 52 bytes to 32 bytes.  There is usually one of
these for every namespace object, so the memory savings is
significant.

Implemented just-in-time evaluation of the CreateField
operators.

Bug fixes for IA-64 support have been integrated.

Additional code review comments have been implemented

The so-called "third pass parse" has been replaced by a
final walk through the namespace to initialize all operation
regions (address spaces) and fields that have not yet been
initialized during the execution of the various _INI and REG
methods.

New file - namespace/nsinit.c

-------------------------------------------
Summary of changes for this label: 09_01_00

Namespace manager data structures have been reworked to
change the primary  object from a table to a single object.
This has resulted in dynamic memory  savings of 3X within
the namespace and 2X overall in the ACPI CA subsystem.

Fixed problem where the call to AcpiEvFindPciRootBuses was
inadvertently left  commented out.

Reduced the warning count when generating the source with
the GCC compiler.

Revision numbers added to each module header showing the
SourceSafe version of the file.  Please refer to this
version number when giving us feedback or comments on
individual modules.

The main object types within the subsystem have been renamed
to clarify their  purpose:

ACPI_INTERNAL_OBJECT -> ACPI_OPERAND_OBJECT
ACPI_GENERIC_OP -> ACPI_PARSE_OBJECT
ACPI_NAME_TABLE_ENTRY -> ACPI_NAMESPACE_NODE

NOTE: no changes to the initialization sequence are included
in this label.

-------------------------------------------
Summary of changes for this label: 08_23_00

Fixed problem where TerminateControlMethod was being called
multiple times per  method

Fixed debugger problem where single stepping caused a
semaphore to be  oversignalled

Improved performance through additional parse object caching
- added  ACPI_EXTENDED_OP type

-------------------------------------------
Summary of changes for this label: 08_10_00

Parser/Interpreter integration:  Eliminated the creation of
complete parse trees  for ACPI tables and control methods.
Instead, parse subtrees are created and  then deleted as
soon as they are processed (Either entered into the
namespace or  executed by the interpreter).  This reduces
the use of dynamic kernel memory  significantly. (about 10X)

Exception codes broken into classes and renumbered.  Be sure
to recompile all  code that includes acexcep.h.  Hopefully
we won't have to renumber the codes  again now that they are
split into classes (environment, programmer, AML code,  ACPI
table, and internal).

Fixed some additional alignment issues in the Resource
Manager subcomponent

Implemented semaphore tracking in the AcpiExec utility, and
fixed several places  where mutexes/semaphores were being
unlocked without a corresponding lock  operation.  There are
no known semaphore or mutex "leaks" at this time.

Fixed the case where an ASL Return operator is used to
return an unnamed  package.

-------------------------------------------
Summary of changes for this label: 07_28_00

Fixed a problem with the way addresses were calculated in
AcpiAmlReadFieldData()  and AcpiAmlWriteFieldData(). This
problem manifested itself when a Field was  created with
WordAccess or DwordAccess, but the field unit defined within
the  Field was less than a Word or Dword.

Fixed a problem in AmlDumpOperands() module's loop to pull
operands off of the  operand stack to display information.
The problem manifested itself as a TLB  error on 64-bit
systems when accessing an operand stack with two or more
operands.

Fixed a problem with the PCI configuration space handlers
where context was  getting confused between accesses. This
required a change to the generic address  space handler and
address space setup definitions. Handlers now get both a
global handler context (this is the one passed in by the
user when executing  AcpiInstallAddressSpaceHandler() and a
specific region context that is unique to  each region (For
example, the _ADR, _SEG and _BBN values associated with a
specific region). The generic function definitions have
changed to the  following:

typedef ACPI_STATUS (*ADDRESS_SPACE_HANDLER) ( UINT32
Function, UINT32 Address, UINT32 BitWidth, UINT32 *Value,
void *HandlerContext, // This used to be void *Context void
*RegionContext); // This is an additional parameter

typedef ACPI_STATUS (*ADDRESS_SPACE_SETUP) ( ACPI_HANDLE
RegionHandle, UINT32 Function, void *HandlerContext,  void
**RegionContext); // This used to be **ReturnContext

-------------------------------------------
Summary of changes for this label: 07_21_00

Major file consolidation and rename.  All files within the
interpreter have been  renamed as well as most header files.
This was done to prevent collisions with  existing files in
the host OSs -- filenames such as "config.h" and "global.h"
seem to be quite common.  The VC project files have been
updated.  All makefiles  will require modification.

The parser/interpreter integration continues in Phase 5 with
the implementation  of a complete 2-pass parse (the AML is
parsed twice) for each table;  This  avoids the construction
of a huge parse tree and therefore reduces the amount of
dynamic memory required by the subsystem.  Greater use of
the parse object cache  means that performance is
unaffected.

Many comments from the two code reviews have been rolled in.

The 64-bit alignment support is complete.

-------------------------------------------
Summary of changes for this label: 06_30_00

With a nod and a tip of the hat to the technology of
yesteryear, we've added  support in the source code for 80
column output devices.  The code is now mostly  constrained
to 80 columns or less to support environments and editors
that 1)  cannot display or print more than 80 characters on
a single line, and 2) cannot  disable line wrapping.

A major restructuring of the namespace data structure has
been completed.  The  result is 1) cleaner and more
understandable/maintainable code, and 2) a  significant
reduction in the dynamic memory requirement for each named
ACPI  object (almost half).

-------------------------------------------
Summary of changes for this label: 06_23_00

Linux support has been added.  In order to obtain approval
to get the ACPI CA  subsystem into the Linux kernel, we've
had to make quite a few changes to the  base subsystem that
will affect all users (all the changes are generic and OS-
independent).  The effects of these global changes have been
somewhat far  reaching.  Files have been merged and/or
renamed and interfaces have been  renamed.   The major
changes are described below.

Osd* interfaces renamed to AcpiOs* to eliminate namespace
pollution/confusion  within our target kernels.  All OSD
interfaces must be modified to match the new  naming
convention.

Files merged across the subsystem.  A number of the smaller
source and header  files have been merged to reduce the file
count and increase the density of the  existing files.
There are too many to list here.  In general, makefiles that
call out individual files will require rebuilding.

Interpreter files renamed.  All interpreter files now have
the prefix am*  instead of ie* and is*.

Header files renamed:  The acapi.h file is now acpixf.h.
The acpiosd.h file is  now acpiosxf.h.  We are removing
references to the acronym "API" since it is  somewhat
windowsy. The new name is "external interface" or xface or
xf in the  filenames.j


All manifest constants have been forced to upper case (some
were mixed case.)   Also, the string "ACPI_" has been
prepended to many (not all) of the constants,  typedefs, and
structs.

The globals "DebugLevel" and "DebugLayer" have been renamed
"AcpiDbgLevel" and  "AcpiDbgLayer" respectively.

All other globals within the subsystem are now prefixed with
"AcpiGbl_" Internal procedures within the subsystem are now
prefixed with "Acpi" (with only  a few exceptions).  The
original two-letter abbreviation for the subcomponent
remains after "Acpi" - for example, CmCallocate became
AcpiCmCallocate.

Added a source code translation/conversion utility.  Used to
generate the Linux  source code, it can be modified to
generate other types of source as well. Can  also be used to
cleanup existing source by removing extraneous spaces and
blank  lines.  Found in tools/acpisrc/*

OsdUnMapMemory was renamed to OsdUnmapMemory and then
AcpiOsUnmapMemory.  (UnMap  became Unmap).

A "MaxUnits" parameter has been added to
AcpiOsCreateSemaphore.  When set to  one, this indicates
that the caller wants to use the semaphore as a mutex, not a
counting semaphore.  ACPI CA uses both types.  However,
implementers of this  call may want to use different OS
primitives depending on the type of semaphore  requested.
For example, some operating systems provide separate "mutex"
and  "semaphore" interfaces - where the mutex interface is
much faster because it  doesn't have all the overhead of a
full semaphore implementation.

Fixed a deadlock problem where a method that accesses the
PCI address space can  block forever if it is the first
access to the space.

-------------------------------------------
Summary of changes for this label: 06_02_00

Support for environments that cannot handle unaligned data
accesses (e.g.  firmware and OS environments devoid of
alignment handler technology namely  SAL/EFI and the IA-64
Linux kernel) has been added (via configurable macros) in
these three areas: - Transfer of data from the raw AML byte
stream is done via byte moves instead of    word/dword/qword
moves. - External objects are aligned within the user
buffer, including package   elements (sub-objects). -
Conversion of name strings to UINT32 Acpi Names is now done
byte-wise.

The Store operator was modified to mimic Microsoft's
implementation when storing  to a Buffer Field.

Added a check of the BM_STS bit before entering C3.

The methods subdirectory has been obsoleted and removed.  A
new file, cmeval.c  subsumes the functionality.

A 16-bit (DOS) version of AcpiExec has been developed.  The
makefile is under  the acpiexec directory.