321 lines
11 KiB
C
321 lines
11 KiB
C
/******************************************************************************
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*
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* Module Name: tbxfroot - Find the root ACPI table (RSDT)
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* $Revision: 35 $
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*
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*****************************************************************************/
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/******************************************************************************
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*
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* 1. Copyright Notice
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*
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* Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
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* All rights reserved.
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*
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* 2. License
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*
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* 2.1. This is your license from Intel Corp. under its intellectual property
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* rights. You may have additional license terms from the party that provided
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* you this software, covering your right to use that party's intellectual
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* property rights.
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*
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* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
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* copy of the source code appearing in this file ("Covered Code") an
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* irrevocable, perpetual, worldwide license under Intel's copyrights in the
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* base code distributed originally by Intel ("Original Intel Code") to copy,
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* make derivatives, distribute, use and display any portion of the Covered
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* Code in any form, with the right to sublicense such rights; and
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*
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* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
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* license (with the right to sublicense), under only those claims of Intel
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* patents that are infringed by the Original Intel Code, to make, use, sell,
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* offer to sell, and import the Covered Code and derivative works thereof
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* solely to the minimum extent necessary to exercise the above copyright
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* license, and in no event shall the patent license extend to any additions
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* to or modifications of the Original Intel Code. No other license or right
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* is granted directly or by implication, estoppel or otherwise;
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*
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* The above copyright and patent license is granted only if the following
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* conditions are met:
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*
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* 3. Conditions
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*
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* 3.1. Redistribution of Source with Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification with rights to further distribute source must include
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* the above Copyright Notice, the above License, this list of Conditions,
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* and the following Disclaimer and Export Compliance provision. In addition,
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* Licensee must cause all Covered Code to which Licensee contributes to
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* contain a file documenting the changes Licensee made to create that Covered
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* Code and the date of any change. Licensee must include in that file the
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* documentation of any changes made by any predecessor Licensee. Licensee
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* must include a prominent statement that the modification is derived,
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* directly or indirectly, from Original Intel Code.
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*
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* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
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* Redistribution of source code of any substantial portion of the Covered
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* Code or modification without rights to further distribute source must
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* include the following Disclaimer and Export Compliance provision in the
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* documentation and/or other materials provided with distribution. In
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* addition, Licensee may not authorize further sublicense of source of any
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* portion of the Covered Code, and must include terms to the effect that the
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* license from Licensee to its licensee is limited to the intellectual
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* property embodied in the software Licensee provides to its licensee, and
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* not to intellectual property embodied in modifications its licensee may
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* make.
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*
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* 3.3. Redistribution of Executable. Redistribution in executable form of any
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* substantial portion of the Covered Code or modification must reproduce the
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* above Copyright Notice, and the following Disclaimer and Export Compliance
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* provision in the documentation and/or other materials provided with the
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* distribution.
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*
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* 3.4. Intel retains all right, title, and interest in and to the Original
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* Intel Code.
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*
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* 3.5. Neither the name Intel nor any other trademark owned or controlled by
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* Intel shall be used in advertising or otherwise to promote the sale, use or
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* other dealings in products derived from or relating to the Covered Code
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* without prior written authorization from Intel.
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*
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* 4. Disclaimer and Export Compliance
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*
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* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
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* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
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* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
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* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
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* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
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* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
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* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
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* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
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* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
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* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
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* LIMITED REMEDY.
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*
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* 4.3. Licensee shall not export, either directly or indirectly, any of this
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* software or system incorporating such software without first obtaining any
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* required license or other approval from the U. S. Department of Commerce or
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* any other agency or department of the United States Government. In the
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* event Licensee exports any such software from the United States or
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* re-exports any such software from a foreign destination, Licensee shall
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* ensure that the distribution and export/re-export of the software is in
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* compliance with all laws, regulations, orders, or other restrictions of the
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* U.S. Export Administration Regulations. Licensee agrees that neither it nor
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* any of its subsidiaries will export/re-export any technical data, process,
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* software, or service, directly or indirectly, to any country for which the
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* United States government or any agency thereof requires an export license,
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* other governmental approval, or letter of assurance, without first obtaining
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* such license, approval or letter.
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*
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*****************************************************************************/
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#define __TBXFROOT_C__
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#include "acpi.h"
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#include "achware.h"
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#include "actables.h"
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#define _COMPONENT TABLE_MANAGER
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MODULE_NAME ("tbxfroot")
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#define RSDP_CHECKSUM_LENGTH 20
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/*******************************************************************************
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*
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* FUNCTION: AcpiFindRootPointer
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*
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* PARAMETERS: **RsdpPhysicalAddress - Where to place the RSDP address
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*
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* RETURN: Status, Physical address of the RSDP
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*
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* DESCRIPTION: Find the RSDP
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiFindRootPointer (
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ACPI_PHYSICAL_ADDRESS *RsdpPhysicalAddress)
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{
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ACPI_TABLE_DESC TableInfo;
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ACPI_STATUS Status;
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FUNCTION_TRACE ("AcpiFindRootPointer");
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/* Get the RSDP */
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Status = AcpiTbFindRsdp (&TableInfo);
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if (ACPI_FAILURE (Status))
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{
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DEBUG_PRINT (ACPI_ERROR, ("RSDP structure not found\n"));
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return_ACPI_STATUS (AE_NO_ACPI_TABLES);
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}
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*RsdpPhysicalAddress = TableInfo.PhysicalAddress;
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbScanMemoryForRsdp
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*
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* PARAMETERS: StartAddress - Starting pointer for search
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* Length - Maximum length to search
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*
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* RETURN: Pointer to the RSDP if found, otherwise NULL.
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*
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* DESCRIPTION: Search a block of memory for the RSDP signature
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*
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******************************************************************************/
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UINT8 *
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AcpiTbScanMemoryForRsdp (
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UINT8 *StartAddress,
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UINT32 Length)
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{
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UINT32 Offset;
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UINT8 *MemRover;
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FUNCTION_TRACE ("TbScanMemoryForRsdp");
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/* Search from given start addr for the requested length */
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for (Offset = 0, MemRover = StartAddress;
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Offset < Length;
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Offset += RSDP_SCAN_STEP, MemRover += RSDP_SCAN_STEP)
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{
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/* The signature and checksum must both be correct */
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if (STRNCMP ((NATIVE_CHAR *) MemRover,
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RSDP_SIG, sizeof (RSDP_SIG)-1) == 0 &&
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AcpiTbChecksum (MemRover, RSDP_CHECKSUM_LENGTH) == 0)
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{
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/* If so, we have found the RSDP */
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return_PTR (MemRover);
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}
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}
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/* Searched entire block, no RSDP was found */
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return_PTR (NULL);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiTbFindRsdp
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*
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* PARAMETERS: *BufferPtr - If == NULL, read data from buffer
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* rather than searching memory
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* *TableInfo - Where the table info is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Search lower 1Mbyte of memory for the root system descriptor
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* pointer structure. If it is found, set *RSDP to point to it.
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*
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* NOTE: The RSDP must be either in the first 1K of the Extended
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* BIOS Data Area or between E0000 and FFFFF (ACPI 1.0 section
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* 5.2.2; assertion #421).
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiTbFindRsdp (
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ACPI_TABLE_DESC *TableInfo)
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{
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UINT8 *TablePtr;
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UINT8 *MemRover;
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UINT64 PhysAddr;
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ACPI_STATUS Status = AE_OK;
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FUNCTION_TRACE ("TbFindRsdp");
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/*
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* Search memory for RSDP. First map low physical memory.
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*/
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Status = AcpiOsMapMemory (LO_RSDP_WINDOW_BASE, LO_RSDP_WINDOW_SIZE,
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(void **)&TablePtr);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/*
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* 1) Search EBDA (low memory) paragraphs
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*/
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MemRover = AcpiTbScanMemoryForRsdp (TablePtr, LO_RSDP_WINDOW_SIZE);
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/* This mapping is no longer needed */
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AcpiOsUnmapMemory (TablePtr, LO_RSDP_WINDOW_SIZE);
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if (MemRover)
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{
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/* Found it, return the physical address */
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PhysAddr = LO_RSDP_WINDOW_BASE;
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PhysAddr += (MemRover - TablePtr);
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TableInfo->PhysicalAddress = PhysAddr;
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return_ACPI_STATUS (AE_OK);
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}
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/*
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* 2) Search upper memory: 16-byte boundaries in E0000h-F0000h
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*/
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Status = AcpiOsMapMemory (HI_RSDP_WINDOW_BASE, HI_RSDP_WINDOW_SIZE,
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(void **)&TablePtr);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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MemRover = AcpiTbScanMemoryForRsdp (TablePtr, HI_RSDP_WINDOW_SIZE);
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/* This mapping is no longer needed */
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AcpiOsUnmapMemory (TablePtr, HI_RSDP_WINDOW_SIZE);
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if (MemRover)
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{
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/* Found it, return the physical address */
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PhysAddr = HI_RSDP_WINDOW_BASE;
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PhysAddr += (MemRover - TablePtr);
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TableInfo->PhysicalAddress = PhysAddr;
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return_ACPI_STATUS (AE_OK);
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}
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/* RSDP signature was not found */
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return_ACPI_STATUS (AE_NOT_FOUND);
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}
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