1 /*****************************************************************************
3 * Copyright (C) 2012 Advanced Micro Devices, Inc.
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7 * modification, are permitted provided that the following conditions are met:
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9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
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12 * documentation and/or other materials provided with the distribution.
13 * * Neither the name of Advanced Micro Devices, Inc. nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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29 ***************************************************************************/
42 Signature - table signature
49 void* ACPI_LocateTable(
54 UINT32* RsdPtr = (UINT32*)0xe0000;
56 DESCRIPTION_HEADER* CurrentTable;
58 // if (*RsdPtr == ' DSR' && *(RsdPtr+1) == ' RTP'){
59 if ((*RsdPtr == Int32FromChar ('R', 'S', 'D', ' ')) && (*(RsdPtr+1) == Int32FromChar ('R', 'T', 'P', ' '))){
60 Rsdt = (UINT32*)((RSDP*)RsdPtr)->RsdtAddress;
64 }while (RsdPtr <= (UINT32*)0xffff0);
65 if(Rsdt != NULL && ACPI_GetTableChecksum(Rsdt)==0){
66 for (i = 0;i < (((DESCRIPTION_HEADER*)Rsdt)->Length - sizeof(DESCRIPTION_HEADER))/4;i++){
67 CurrentTable = (DESCRIPTION_HEADER*)*(UINT32*)((UINT8*)Rsdt + sizeof(DESCRIPTION_HEADER) + i*4);
68 if (CurrentTable->Signature == Signature) return CurrentTable;
82 TablePtr - table pointer
89 void ACPI_SetTableChecksum(
94 ((DESCRIPTION_HEADER*)TablePtr)->Checksum = 0;
95 Checksum = ACPI_GetTableChecksum(TablePtr);
96 ((DESCRIPTION_HEADER*)TablePtr)->Checksum = 0x100 - Checksum;
107 TablePtr - table pointer
114 UINT8 ACPI_GetTableChecksum(
118 return GetByteSum(TablePtr,((DESCRIPTION_HEADER*)TablePtr)->Length);