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| /****************************************************************************** |
| * |
| * Module Name: tbxfroot - Find the root ACPI table (RSDT) |
| * |
| *****************************************************************************/ |
| |
| /****************************************************************************** |
| * |
| * 1. Copyright Notice |
| * |
| * Some or all of this work - Copyright (c) 1999 - 2010, 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 "acpi.h" |
| #include "accommon.h" |
| #include "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: AcpiFindRootPointer |
| * |
| * 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_SIZE *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 0x%8.8X for length %u", |
| 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_PHYSICAL_ADDRESS) PhysicalAddress, |
| ACPI_EBDA_WINDOW_SIZE); |
| if (!TablePtr) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Could not map memory at 0x%8.8X for length %u", |
| 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 0x%8.8X for length %u", |
| 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); |
| } |
| |