Add an internal DMI decoder

Previously we had to rely on dmidecode to decode the DMI/SMBIOS table.
This patch integrates a DMI decoder into flashrom. The old behavior of calling
dmidecode can be brought back by using CONFIG_INTERNAL_DMI=no.

Significant portions of this patch were taken from dmidecode, hence add its
authors to the copyright notice (dmidecode is also GPL2+). We do a few things
differently though. First of all we do more bounds checking to prevent accessing
unmapped memory. We do not support disovery via EFI (yet), but memory
scanning only. We handle the chassis-type lock bit correctly which dmidecode
did not for a long while.

The API to the rest of flashrom remains stable, but the output changes slightly.
To share as much code as possible (which actually is not much), i have added
dmi_fill methods that get called in dmi_init. They are reponsible to fill the
dmi_strings array and setting the is_laptop variable. After it is called, dmi_init
prints all dmi_strings. Previously the strings were printed in the order they were
discovered, followed by the chassis-type, which is now output earlier (in dmi_fill).

Because DJGPP does not support strnlen a simple implementation was added
for it.

This is still only available on x86; actually it is not even compiled in for other
architectures at all anymore.

Corresponding to flashrom svn r1735.

Signed-off-by: Sean Nelson <audiohacked@gmail.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Tested-by: Maciej Pijanka <maciej.pijanka@gmail.com>
Tested-by: Idwer Vollering <vidwer@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>

1 files changed, 22 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index d1bd59c..b7315a4 100644
--- a/Makefile
+++ b/Makefile
@@ -440,6 +440,23 @@ endif
 endif
 
 ###############################################################################
+# Handle CONFIG_* variables that depend on others set (and verified) above.
+
+# The external DMI decoder (dmidecode) does not work in libpayload. Bail out if the internal one got disabled.
+ifeq ($(TARGET_OS), libpayload)
+ifeq ($(CONFIG_INTERNAL), yes)
+ifeq ($(CONFIG_INTERNAL_DMI), no)
+UNSUPPORTED_FEATURES += CONFIG_INTERNAL_DMI=no
+else
+override CONFIG_INTERNAL_DMI = yes
+endif
+endif
+endif
+
+# Use internal DMI/SMBIOS decoder by default instead of relying on dmidecode.
+CONFIG_INTERNAL_DMI ?= yes
+
+###############################################################################
 # Programmer drivers and programmer support infrastructure.
 # Depending on the CONFIG_* variables set and verified above we set compiler flags and parameters below.
 
@@ -447,10 +464,13 @@ FEATURE_CFLAGS += -D'CONFIG_DEFAULT_PROGRAMMER=$(CONFIG_DEFAULT_PROGRAMMER)'
 
 ifeq ($(CONFIG_INTERNAL), yes)
 FEATURE_CFLAGS += -D'CONFIG_INTERNAL=1'
-PROGRAMMER_OBJS += processor_enable.o chipset_enable.o board_enable.o cbtable.o dmi.o internal.o
+PROGRAMMER_OBJS += processor_enable.o chipset_enable.o board_enable.o cbtable.o internal.o
 ifeq ($(ARCH), x86)
 PROGRAMMER_OBJS += it87spi.o it85spi.o sb600spi.o amd_imc.o wbsio_spi.o mcp6x_spi.o
-PROGRAMMER_OBJS += ichspi.o ich_descriptors.o
+PROGRAMMER_OBJS += ichspi.o ich_descriptors.o dmi.o
+ifeq ($(CONFIG_INTERNAL_DMI), yes)
+FEATURE_CFLAGS += -D'CONFIG_INTERNAL_DMI=1'
+endif
 else
 endif
 NEED_PCI := yes