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Diffstat (limited to 'sys/contrib/dev/acpica/tbxfroot.c')
| -rw-r--r-- | sys/contrib/dev/acpica/tbxfroot.c | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/sys/contrib/dev/acpica/tbxfroot.c b/sys/contrib/dev/acpica/tbxfroot.c new file mode 100644 index 0000000..afc30ad --- /dev/null +++ b/sys/contrib/dev/acpica/tbxfroot.c @@ -0,0 +1,370 @@ +/****************************************************************************** + * + * Module Name: tbxfroot - Find the root ACPI table (RSDT) + * $Revision: 1.105 $ + * + *****************************************************************************/ + +/****************************************************************************** + * + * 1. Copyright Notice + * + * Some or all of this work - Copyright (c) 1999 - 2007, Intel Corp. + * All rights reserved. + * + * 2. License + * + * 2.1. This is your license from Intel Corp. under its intellectual property + * rights. You may have additional license terms from the party that provided + * you this software, covering your right to use that party's intellectual + * property rights. + * + * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a + * copy of the source code appearing in this file ("Covered Code") an + * irrevocable, perpetual, worldwide license under Intel's copyrights in the + * base code distributed originally by Intel ("Original Intel Code") to copy, + * make derivatives, distribute, use and display any portion of the Covered + * Code in any form, with the right to sublicense such rights; and + * + * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent + * license (with the right to sublicense), under only those claims of Intel + * patents that are infringed by the Original Intel Code, to make, use, sell, + * offer to sell, and import the Covered Code and derivative works thereof + * solely to the minimum extent necessary to exercise the above copyright + * license, and in no event shall the patent license extend to any additions + * to or modifications of the Original Intel Code. No other license or right + * is granted directly or by implication, estoppel or otherwise; + * + * The above copyright and patent license is granted only if the following + * conditions are met: + * + * 3. Conditions + * + * 3.1. Redistribution of Source with Rights to Further Distribute Source. + * Redistribution of source code of any substantial portion of the Covered + * Code or modification with rights to further distribute source must include + * the above Copyright Notice, the above License, this list of Conditions, + * and the following Disclaimer and Export Compliance provision. In addition, + * Licensee must cause all Covered Code to which Licensee contributes to + * contain a file documenting the changes Licensee made to create that Covered + * Code and the date of any change. Licensee must include in that file the + * documentation of any changes made by any predecessor Licensee. Licensee + * must include a prominent statement that the modification is derived, + * directly or indirectly, from Original Intel Code. + * + * 3.2. Redistribution of Source with no Rights to Further Distribute Source. + * Redistribution of source code of any substantial portion of the Covered + * Code or modification without rights to further distribute source must + * include the following Disclaimer and Export Compliance provision in the + * documentation and/or other materials provided with distribution. In + * addition, Licensee may not authorize further sublicense of source of any + * portion of the Covered Code, and must include terms to the effect that the + * license from Licensee to its licensee is limited to the intellectual + * property embodied in the software Licensee provides to its licensee, and + * not to intellectual property embodied in modifications its licensee may + * make. + * + * 3.3. Redistribution of Executable. Redistribution in executable form of any + * substantial portion of the Covered Code or modification must reproduce the + * above Copyright Notice, and the following Disclaimer and Export Compliance + * provision in the documentation and/or other materials provided with the + * distribution. + * + * 3.4. Intel retains all right, title, and interest in and to the Original + * Intel Code. + * + * 3.5. Neither the name Intel nor any other trademark owned or controlled by + * Intel shall be used in advertising or otherwise to promote the sale, use or + * other dealings in products derived from or relating to the Covered Code + * without prior written authorization from Intel. + * + * 4. Disclaimer and Export Compliance + * + * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED + * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE + * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, + * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY + * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY + * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A + * PARTICULAR PURPOSE. + * + * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES + * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR + * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, + * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY + * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL + * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS + * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY + * LIMITED REMEDY. + * + * 4.3. Licensee shall not export, either directly or indirectly, any of this + * software or system incorporating such software without first obtaining any + * required license or other approval from the U. S. Department of Commerce or + * any other agency or department of the United States Government. In the + * event Licensee exports any such software from the United States or + * re-exports any such software from a foreign destination, Licensee shall + * ensure that the distribution and export/re-export of the software is in + * compliance with all laws, regulations, orders, or other restrictions of the + * U.S. Export Administration Regulations. Licensee agrees that neither it nor + * any of its subsidiaries will export/re-export any technical data, process, + * software, or service, directly or indirectly, to any country for which the + * United States government or any agency thereof requires an export license, + * other governmental approval, or letter of assurance, without first obtaining + * such license, approval or letter. + * + *****************************************************************************/ + +#define __TBXFROOT_C__ + +#include <contrib/dev/acpica/acpi.h> +#include <contrib/dev/acpica/actables.h> + + +#define _COMPONENT ACPI_TABLES + ACPI_MODULE_NAME ("tbxfroot") + +/* Local prototypes */ + +static UINT8 * +AcpiTbScanMemoryForRsdp ( + UINT8 *StartAddress, + UINT32 Length); + +static ACPI_STATUS +AcpiTbValidateRsdp ( + ACPI_TABLE_RSDP *Rsdp); + + +/******************************************************************************* + * + * FUNCTION: AcpiTbValidateRsdp + * + * PARAMETERS: Rsdp - Pointer to unvalidated RSDP + * + * RETURN: Status + * + * DESCRIPTION: Validate the RSDP (ptr) + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiTbValidateRsdp ( + ACPI_TABLE_RSDP *Rsdp) +{ + ACPI_FUNCTION_ENTRY (); + + + /* + * The signature and checksum must both be correct + * + * Note: Sometimes there exists more than one RSDP in memory; the valid + * RSDP has a valid checksum, all others have an invalid checksum. + */ + if (ACPI_STRNCMP ((char *) Rsdp, ACPI_SIG_RSDP, sizeof (ACPI_SIG_RSDP)-1) != 0) + { + /* Nope, BAD Signature */ + + return (AE_BAD_SIGNATURE); + } + + /* Check the standard checksum */ + + if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) + { + return (AE_BAD_CHECKSUM); + } + + /* Check extended checksum if table version >= 2 */ + + if ((Rsdp->Revision >= 2) && + (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) + { + return (AE_BAD_CHECKSUM); + } + + return (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiTbFindRsdp + * + * PARAMETERS: TableAddress - Where the table pointer is returned + * + * RETURN: Status, RSDP physical address + * + * DESCRIPTION: Search lower 1Mbyte of memory for the root system descriptor + * pointer structure. If it is found, set *RSDP to point to it. + * + * NOTE1: The RSDP must be either in the first 1K of the Extended + * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) + * Only a 32-bit physical address is necessary. + * + * NOTE2: This function is always available, regardless of the + * initialization state of the rest of ACPI. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiFindRootPointer ( + ACPI_NATIVE_UINT *TableAddress) +{ + UINT8 *TablePtr; + UINT8 *MemRover; + UINT32 PhysicalAddress; + + + ACPI_FUNCTION_TRACE (AcpiFindRootPointer); + + + /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ + + TablePtr = AcpiOsMapMemory ( + (ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION, + ACPI_EBDA_PTR_LENGTH); + if (!TablePtr) + { + ACPI_ERROR ((AE_INFO, + "Could not map memory at %8.8X for length %X", + ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); + + return_ACPI_STATUS (AE_NO_MEMORY); + } + + ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr); + + /* Convert segment part to physical address */ + + PhysicalAddress <<= 4; + AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH); + + /* EBDA present? */ + + if (PhysicalAddress > 0x400) + { + /* + * 1b) Search EBDA paragraphs (EBDA is required to be a + * minimum of 1K length) + */ + TablePtr = AcpiOsMapMemory ( + (ACPI_NATIVE_UINT) PhysicalAddress, + ACPI_EBDA_WINDOW_SIZE); + if (!TablePtr) + { + ACPI_ERROR ((AE_INFO, + "Could not map memory at %8.8X for length %X", + PhysicalAddress, ACPI_EBDA_WINDOW_SIZE)); + + return_ACPI_STATUS (AE_NO_MEMORY); + } + + MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_EBDA_WINDOW_SIZE); + AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE); + + if (MemRover) + { + /* Return the physical address */ + + PhysicalAddress += (UINT32) ACPI_PTR_DIFF (MemRover, TablePtr); + + *TableAddress = PhysicalAddress; + return_ACPI_STATUS (AE_OK); + } + } + + /* + * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh + */ + TablePtr = AcpiOsMapMemory ( + (ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE, + ACPI_HI_RSDP_WINDOW_SIZE); + + if (!TablePtr) + { + ACPI_ERROR ((AE_INFO, + "Could not map memory at %8.8X for length %X", + ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); + + return_ACPI_STATUS (AE_NO_MEMORY); + } + + MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); + AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE); + + if (MemRover) + { + /* Return the physical address */ + + PhysicalAddress = (UINT32) + (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr)); + + *TableAddress = PhysicalAddress; + return_ACPI_STATUS (AE_OK); + } + + /* A valid RSDP was not found */ + + ACPI_ERROR ((AE_INFO, "A valid RSDP was not found")); + return_ACPI_STATUS (AE_NOT_FOUND); +} + +ACPI_EXPORT_SYMBOL (AcpiFindRootPointer) + + +/******************************************************************************* + * + * FUNCTION: AcpiTbScanMemoryForRsdp + * + * PARAMETERS: StartAddress - Starting pointer for search + * Length - Maximum length to search + * + * RETURN: Pointer to the RSDP if found, otherwise NULL. + * + * DESCRIPTION: Search a block of memory for the RSDP signature + * + ******************************************************************************/ + +static UINT8 * +AcpiTbScanMemoryForRsdp ( + UINT8 *StartAddress, + UINT32 Length) +{ + ACPI_STATUS Status; + UINT8 *MemRover; + UINT8 *EndAddress; + + + ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp); + + + EndAddress = StartAddress + Length; + + /* Search from given start address for the requested length */ + + for (MemRover = StartAddress; MemRover < EndAddress; + MemRover += ACPI_RSDP_SCAN_STEP) + { + /* The RSDP signature and checksum must both be correct */ + + Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover)); + if (ACPI_SUCCESS (Status)) + { + /* Sig and checksum valid, we have found a real RSDP */ + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "RSDP located at physical address %p\n", MemRover)); + return_PTR (MemRover); + } + + /* No sig match or bad checksum, keep searching */ + } + + /* Searched entire block, no RSDP was found */ + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Searched entire block from %p, valid RSDP was not found\n", + StartAddress)); + return_PTR (NULL); +} + |
