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/*****************************************************************************
*
* Copyright (C) 2012 Advanced Micro Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Advanced Micro Devices, Inc. nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ADVANCED MICRO DEVICES, INC. BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
***************************************************************************/
#include "Platform.h"
/*++
Routine Description:
Locate ACPI table
Arguments:
Signature - table signature
Returns:
pointer to ACPI table
--*/
void* ACPI_LocateTable(
UINT32 Signature
)
{
UINT32 i;
UINT32 *RsdPtr = (UINT32 *)0xe0000;
UINT32 *Rsdt = NULL;
DESCRIPTION_HEADER *CurrentTable;
do{
// if (*RsdPtr == ' DSR' && *(RsdPtr+1) == ' RTP'){
if ((*RsdPtr == Int32FromChar ('R', 'S', 'D', ' ')) && (*(RsdPtr+1) == Int32FromChar ('R', 'T', 'P', ' '))){
Rsdt = (UINT32 *)(uintptr_t)((RSDP *)RsdPtr)->RsdtAddress;
break;
}
RsdPtr+=4;
}while (RsdPtr <= (UINT32*)0xffff0);
if(Rsdt != NULL && ACPI_GetTableChecksum(Rsdt)==0){
for (i = 0;i < (((DESCRIPTION_HEADER*)Rsdt)->Length - sizeof(DESCRIPTION_HEADER))/4;i++){
CurrentTable = (DESCRIPTION_HEADER*)(uintptr_t)*(UINT32*)((UINT8*)Rsdt + sizeof(DESCRIPTION_HEADER) + i*4);
if (CurrentTable->Signature == Signature) return CurrentTable;
}
}
return NULL;
}
/*++
Routine Description:
Update table checksum
Arguments:
TablePtr - table pointer
Returns:
none
--*/
void ACPI_SetTableChecksum(
void* TablePtr
)
{
UINT8 Checksum = 0;
((DESCRIPTION_HEADER*)TablePtr)->Checksum = 0;
Checksum = ACPI_GetTableChecksum(TablePtr);
((DESCRIPTION_HEADER*)TablePtr)->Checksum = 0x100 - Checksum;
}
/*++
Routine Description:
Get table checksum
Arguments:
TablePtr - table pointer
Returns:
none
--*/
UINT8 ACPI_GetTableChecksum(
void* TablePtr
)
{
return GetByteSum(TablePtr,((DESCRIPTION_HEADER*)TablePtr)->Length);
}
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