144 lines
2.6 KiB
C
144 lines
2.6 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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All rights reserved
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Module Name:
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acpidtct.c
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Abstract:
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This module peruses the ACPI tables looking for specific
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entries.
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Author:
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Matt Holle (matth) (shamefully stolen from jakeo's x86 code)
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Environment:
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Revision History:
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--*/
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#include "stdlib.h"
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#include "string.h"
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#include "bldr.h"
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#include "acpitabl.h"
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extern PVOID AcpiTable;
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PDESCRIPTION_HEADER
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BlFindACPITable(
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IN PCHAR TableName,
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IN ULONG TableLength
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)
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/*++
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Routine Description:
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Given a table name, finds that table in the ACPI BIOS
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Arguments:
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TableName - Supplies the table name
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TableLength - Supplies the length of the table to map
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Return Value:
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Pointer to the table if found
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NULL if the table is not found
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Note:
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This function is not capable of returning a pointer to
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a table with a signature of DSDT. But that's never necessary
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in the loader. If the loader ever incorporates an AML
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interpreter, this will have to be enhanced.
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--*/
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{
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ULONG Signature;
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PDESCRIPTION_HEADER Header;
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ULONG TableCount;
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ULONG i;
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PXSDT xsdt = NULL;
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PRSDP rsdp = (PRSDP)AcpiTable;
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char buffer[20] = {0};
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//DbgPrint("Hunting for table %s\n", TableName);
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//
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// Sanity Check.
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//
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if (rsdp) {
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//DbgPrint("Looking through 2.0 RSDP: %p\n", rsdp20);
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xsdt = (PVOID)rsdp->XsdtAddress.QuadPart;
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if (xsdt->Header.Signature != XSDT_SIGNATURE) {
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//
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// Found ACPI 2.0 tables, but the signature
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// is garbage.
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//
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return NULL;
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}
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} else {
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//
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// Didn't find any tables at all.
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//
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return NULL;
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}
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Signature = *((ULONG UNALIGNED *)TableName);
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//
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// If they want the root table, we've already got that.
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//
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if (Signature == XSDT_SIGNATURE) {
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return(&xsdt->Header);
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} else {
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TableCount = NumTableEntriesFromXSDTPointer(xsdt);
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//DbgPrint("xSDT contains %d tables\n", TableCount);
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//
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// Sanity check.
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//
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if( TableCount > 0x100 ) {
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return(NULL);
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}
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//
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// Dig.
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//
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for (i=0;i<TableCount;i++) {
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Header = (PDESCRIPTION_HEADER)(xsdt->Tables[i].QuadPart);
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if (Header->Signature == Signature) {
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//DbgPrint("Table Address: %p\n", Header);
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return(Header);
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}
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}
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}
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//DbgPrint("Table not found\n");
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return(NULL);
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}
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