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/*
*****************************************************************************
*
* This file is part of the coreboot project.
*
* Copyright (C) 2010 Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* ***************************************************************************
*
*/
#include "SBPLATFORM.h"
//
//
// Routine Description:
//
// Locate ACPI table
//
// Arguments:
//
// Signature - table signature
//
//Returns:
//
// pointer to ACPI table
//
//
VOID*
ACPI_LocateTable (
IN UINT32 Signature
)
{
UINT32 i;
UINT32* RsdPtr;
UINT32* Rsdt;
UINTN tableOffset;
DESCRIPTION_HEADER* CurrentTable;
RsdPtr = (UINT32*) (UINTN)0xe0000;
Rsdt = NULL;
do {
//if ( *RsdPtr == ' DSR' && *(RsdPtr + 1) == ' RTP' ) { //gcc multi-character character constant warning
if ( *RsdPtr == 0x20445352 && *(RsdPtr + 1) == 0x20525450) {
Rsdt = (UINT32*) (UINTN) ((RSDP*)RsdPtr)->RsdtAddress;
break;
}
RsdPtr += 4;
} while ( RsdPtr <= (UINT32*) (UINTN)0xffff0 );
if ( Rsdt != NULL && ACPI_GetTableChecksum (Rsdt) == 0 ) {
for ( i = 0; i < (((DESCRIPTION_HEADER*)Rsdt)->Length - sizeof (DESCRIPTION_HEADER)) / 4; i++ ) {
tableOffset = *(UINTN*) ((UINT8*)Rsdt + sizeof (DESCRIPTION_HEADER) + i * 4);
CurrentTable = (DESCRIPTION_HEADER*)tableOffset;
if ( CurrentTable->Signature == Signature ) {
return CurrentTable;
}
}
}
return NULL;
}
//
//
// Routine Description:
//
// Update table checksum
//
// Arguments:
//
// TablePtr - table pointer
//
// Returns:
//
// none
//
//
VOID
ACPI_SetTableChecksum (
IN VOID* TablePtr
)
{
UINT8 Checksum;
Checksum = 0;
((DESCRIPTION_HEADER*)TablePtr)->Checksum = 0;
Checksum = ACPI_GetTableChecksum (TablePtr);
((DESCRIPTION_HEADER*)TablePtr)->Checksum = (UINT8)(0x100 - Checksum);
}
//
//
// Routine Description:
//
// Get table checksum
//
// Arguments:
//
// TablePtr - table pointer
//
// Returns:
//
// none
//
//
UINT8
ACPI_GetTableChecksum (
IN VOID* TablePtr
)
{
return GetByteSum (TablePtr, ((DESCRIPTION_HEADER*)TablePtr)->Length);
}
UINT8
GetByteSum (
IN VOID* pData,
IN UINT32 Length
)
{
UINT32 i;
UINT8 Checksum;
Checksum = 0;
for ( i = 0; i < Length; i++ ) {
Checksum = Checksum + (*((UINT8*)pData + i));
}
return Checksum;
}
VOID
GetSbAcpiMmioBase (
OUT UINT32* AcpiMmioBase
)
{
UINT32 Value16;
ReadPMIO (SB_PMIOA_REG24 + 2, AccWidthUint16, &Value16);
*AcpiMmioBase = Value16 << 16;
}
VOID
GetSbAcpiPmBase (
OUT UINT16* AcpiPmBase
)
{
ReadPMIO (SB_PMIOA_REG60, AccWidthUint16, AcpiPmBase);
}
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