tbxfroot.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/******************************************************************************
*
* Module Name: tbxfroot - Find the root ACPI table (RSDT)
* $Revision: 85 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2005, 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
* 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
* 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
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* 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 "actables.h"
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME ("tbxfroot")
/* Local prototypes */
static ACPI_STATUS
static UINT8 *
/*******************************************************************************
*
* FUNCTION: AcpiTbFindTable
*
* PARAMETERS: Signature - String with ACPI table signature
* OemId - String with the table OEM ID
* OemTableId - String with the OEM Table ID
* TablePtr - Where the table pointer is returned
*
* RETURN: Status
*
* Signature, OEM ID and OEM Table ID.
*
******************************************************************************/
char *Signature,
char *OemId,
char *OemTableId,
{
ACPI_FUNCTION_TRACE ("TbFindTable");
/* Validate string lengths */
{
}
{
/*
* The DSDT pointer is contained in the FADT, not the RSDT.
* This code should suffice, because the only code that would perform
* a "find" on the DSDT is the DataTableRegion() AML opcode -- in
* which case, the DSDT is guaranteed to be already loaded.
* If this becomes insufficient, the FADT will have to be found first.
*/
if (!AcpiGbl_DSDT)
{
}
}
else
{
/* Find the table */
if (ACPI_FAILURE (Status))
{
}
}
/* Check OemId and OemTableId */
if ((OemId[0] && ACPI_STRNCMP (
(OemTableId[0] && ACPI_STRNCMP (
sizeof (Table->OemTableId))))
{
}
}
/*******************************************************************************
*
* FUNCTION: AcpiGetFirmwareTable
*
* PARAMETERS: Signature - Any ACPI table signature
* Instance - the non zero instance of the table, allows
* support for multiple tables of the same type
* TablePointer - Where a buffer containing the table is
* returned
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get an ACPI table. A buffer is
* allocated for the table and returned in TablePointer.
* This table will be a complete table including the header.
*
******************************************************************************/
{
UINT32 i;
UINT32 j;
ACPI_FUNCTION_TRACE ("AcpiGetFirmwareTable");
/*
* Ensure that at least the table manager is initialized. We don't
* require that the entire ACPI subsystem is up for this interface.
* If we have a buffer, we must have a length too
*/
if ((Instance == 0) ||
(!Signature) ||
(!TablePointer))
{
}
/* Ensure that we have a RSDP */
if (!AcpiGbl_RSDP)
{
/* Get the RSDP */
if (ACPI_FAILURE (Status))
{
}
/* Map and validate the RSDP */
{
sizeof (RSDP_DESCRIPTOR), (void *) &AcpiGbl_RSDP);
if (ACPI_FAILURE (Status))
{
}
}
else
{
}
/* The signature and checksum must both be correct */
sizeof (RSDP_SIG)-1) != 0)
{
/* Nope, BAD Signature */
}
{
/* Nope, BAD Checksum */
}
}
/* Get the RSDT address via the RSDP */
"RSDP located at %p, RSDT physical=%8.8X%8.8X \n",
/* Insert ProcessorMode flags */
/* Get and validate the RSDT */
if (!RsdtInfo)
{
}
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/* Allocate a scratch table header and table descriptor */
if (!Header)
{
goto Cleanup;
}
if (!TableInfo)
{
goto Cleanup;
}
/* Get the number of table pointers within the RSDT */
/*
* requested table
*/
for (i = 0, j = 0; i < TableCount; i++)
{
/* Get the next table pointer, handle RSDT vs. XSDT */
{
}
else
{
}
/* Get the table header */
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/* Compare table signatures and table instance */
{
/* An instance of the table was found */
j++;
if (j >= Instance)
{
/* Found the correct instance, get the entire table */
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
goto Cleanup;
}
}
}
/* Did not find the table */
if (Header)
{
}
if (TableInfo)
{
}
}
/* TBD: Move to a new file */
#if ACPI_MACHINE_WIDTH != 16
/*******************************************************************************
*
* FUNCTION: AcpiFindRootPointer
*
* RsdpAddress - Where to place the RSDP address
*
* RETURN: Status, Physical address of the RSDP
*
* DESCRIPTION: Find the RSDP
*
******************************************************************************/
{
ACPI_FUNCTION_TRACE ("AcpiFindRootPointer");
/* Get the RSDP */
if (ACPI_FAILURE (Status))
{
"RSDP structure not found, %s Flags=%X\n",
}
}
/*******************************************************************************
*
* 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 *
{
ACPI_FUNCTION_TRACE ("TbScanMemoryForRsdp");
/* Search from given start address for the requested length */
{
/* The signature and checksum must both be correct */
if (ACPI_STRNCMP ((char *) MemRover,
{
/* No signature match, keep looking */
continue;
}
/* Signature matches, check the appropriate checksum */
{
/* ACPI version 1.0 */
}
else
{
/* Post ACPI 1.0, use ExtendedChecksum */
}
if (Checksum == 0)
{
/* Checksum valid, we have found a valid RSDP */
"RSDP located at physical address %p\n", MemRover));
}
"Found an RSDP at physical address %p, but it has a bad checksum\n",
MemRover));
}
/* Searched entire block, no RSDP was found */
"Searched entire block, no valid RSDP was found.\n"));
return_PTR (NULL);
}
/*******************************************************************************
*
* FUNCTION: AcpiTbFindRsdp
*
* PARAMETERS: TableInfo - Where the table info is returned
* Flags - Current memory mode (logical vs.
* physical addressing)
*
* 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.
*
******************************************************************************/
static ACPI_STATUS
{
ACPI_FUNCTION_TRACE ("TbFindRsdp");
/*
* Scan supports either logical addressing or physical addressing
*/
{
/* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
ACPI_EBDA_PTR_LENGTH, (void *) &TablePtr);
if (ACPI_FAILURE (Status))
{
"Could not map memory at %8.8X for length %X\n",
}
/* Convert segment part to physical address */
PhysicalAddress <<= 4;
/* EBDA present? */
if (PhysicalAddress > 0x400)
{
/*
* 1b) Search EBDA paragraphs (EBDA is required to be a
* minimum of 1K length)
*/
ACPI_EBDA_WINDOW_SIZE, (void *) &TablePtr);
if (ACPI_FAILURE (Status))
{
"Could not map memory at %8.8X for length %X\n",
}
if (MemRover)
{
/* Found it, return the physical address */
}
}
/*
* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
*/
ACPI_HI_RSDP_WINDOW_SIZE, (void *) &TablePtr);
if (ACPI_FAILURE (Status))
{
"Could not map memory at %8.8X for length %X\n",
}
if (MemRover)
{
/* Found it, return the physical address */
}
}
/*
* Physical addressing
*/
else
{
/* 1a) Get the location of the EBDA */
/* EBDA present? */
if (PhysicalAddress > 0x400)
{
/*
* 1b) Search EBDA paragraphs (EBDA is required to be a minimum of
* 1K length)
*/
if (MemRover)
{
/* Found it, return the physical address */
}
}
/* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */
if (MemRover)
{
/* Found it, return the physical address */
}
}
/* RSDP signature was not found */
}
#endif