| /***************************************************************************** |
| * |
| * 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); |
| } |
| |