/****************************************************************************** * * Module Name: aehandlers - Various handlers for acpiexec * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * *****************************************************************************/ #include "aecommon.h" #define _COMPONENT ACPI_TOOLS ACPI_MODULE_NAME ("aehandlers") /* Local prototypes */ void AeNotifyHandler ( ACPI_HANDLE Device, UINT32 Value, void *Context); void AeDeviceNotifyHandler ( ACPI_HANDLE Device, UINT32 Value, void *Context); ACPI_STATUS AeExceptionHandler ( ACPI_STATUS AmlStatus, ACPI_NAME Name, UINT16 Opcode, UINT32 AmlOffset, void *Context); ACPI_STATUS AeTableHandler ( UINT32 Event, void *Table, void *Context); ACPI_STATUS AeRegionInit ( ACPI_HANDLE RegionHandle, UINT32 Function, void *HandlerContext, void **RegionContext); void AeAttachedDataHandler ( ACPI_HANDLE Object, void *Data); UINT32 SigintCount = 0; AE_DEBUG_REGIONS AeRegions; /****************************************************************************** * * FUNCTION: AeCtrlCHandler * * PARAMETERS: Sig * * RETURN: none * * DESCRIPTION: Control-C handler. Abort running control method if any. * *****************************************************************************/ void __cdecl AeCtrlCHandler ( int Sig) { signal (SIGINT, SIG_IGN); SigintCount++; AcpiOsPrintf ("Caught a ctrl-c (#%u)\n\n", SigintCount); if (AcpiGbl_MethodExecuting) { AcpiGbl_AbortMethod = TRUE; signal (SIGINT, AeCtrlCHandler); if (SigintCount < 10) { return; } } exit (0); } /****************************************************************************** * * FUNCTION: AeNotifyHandler * * PARAMETERS: Standard notify handler parameters * * RETURN: Status * * DESCRIPTION: System notify handler for AcpiExec utility. Used by the ASL * test suite(s) to communicate errors and other information to * this utility via the Notify() operator. * *****************************************************************************/ void AeNotifyHandler ( ACPI_HANDLE Device, UINT32 Value, void *Context) { switch (Value) { #if 0 case 0: printf ("[AcpiExec] Method Error 0x%X: Results not equal\n", Value); if (AcpiGbl_DebugFile) { AcpiOsPrintf ("[AcpiExec] Method Error: Results not equal\n"); } break; case 1: printf ("[AcpiExec] Method Error: Incorrect numeric result\n"); if (AcpiGbl_DebugFile) { AcpiOsPrintf ("[AcpiExec] Method Error: Incorrect numeric result\n"); } break; case 2: printf ("[AcpiExec] Method Error: An operand was overwritten\n"); if (AcpiGbl_DebugFile) { AcpiOsPrintf ("[AcpiExec] Method Error: An operand was overwritten\n"); } break; #endif default: printf ("[AcpiExec] Received a System Notify on [%4.4s] %p Value 0x%2.2X (%s)\n", AcpiUtGetNodeName (Device), Device, Value, AcpiUtGetNotifyName (Value)); if (AcpiGbl_DebugFile) { AcpiOsPrintf ("[AcpiExec] Received a system notify, Value 0x%2.2X\n", Value); } (void) AcpiEvaluateObject (Device, "_NOT", NULL, NULL); break; } } /****************************************************************************** * * FUNCTION: AeDeviceNotifyHandler * * PARAMETERS: Standard notify handler parameters * * RETURN: Status * * DESCRIPTION: Device notify handler for AcpiExec utility. Used by the ASL * test suite(s) to communicate errors and other information to * this utility via the Notify() operator. * *****************************************************************************/ void AeDeviceNotifyHandler ( ACPI_HANDLE Device, UINT32 Value, void *Context) { printf ("[AcpiExec] Received a Device Notify on [%4.4s] %p Value 0x%2.2X (%s)\n", AcpiUtGetNodeName (Device), Device, Value, AcpiUtGetNotifyName (Value)); if (AcpiGbl_DebugFile) { AcpiOsPrintf ("[AcpiExec] Received a device notify, Value 0x%2.2X\n", Value); } (void) AcpiEvaluateObject (Device, "_NOT", NULL, NULL); } /****************************************************************************** * * FUNCTION: AeExceptionHandler * * PARAMETERS: Standard exception handler parameters * * RETURN: Status * * DESCRIPTION: System exception handler for AcpiExec utility. * *****************************************************************************/ ACPI_STATUS AeExceptionHandler ( ACPI_STATUS AmlStatus, ACPI_NAME Name, UINT16 Opcode, UINT32 AmlOffset, void *Context) { ACPI_STATUS NewAmlStatus = AmlStatus; ACPI_STATUS Status; ACPI_BUFFER ReturnObj; ACPI_OBJECT_LIST ArgList; ACPI_OBJECT Arg[3]; const char *Exception; Exception = AcpiFormatException (AmlStatus); AcpiOsPrintf ("[AcpiExec] Exception %s during execution ", Exception); if (Name) { AcpiOsPrintf ("of method [%4.4s]", (char *) &Name); } else { AcpiOsPrintf ("at module level (table load)"); } AcpiOsPrintf (" Opcode [%s] @%X\n", AcpiPsGetOpcodeName (Opcode), AmlOffset); /* * Invoke the _ERR method if present * * Setup parameter object */ ArgList.Count = 3; ArgList.Pointer = Arg; Arg[0].Type = ACPI_TYPE_INTEGER; Arg[0].Integer.Value = AmlStatus; Arg[1].Type = ACPI_TYPE_STRING; Arg[1].String.Pointer = ACPI_CAST_PTR (char, Exception); Arg[1].String.Length = ACPI_STRLEN (Exception); Arg[2].Type = ACPI_TYPE_INTEGER; Arg[2].Integer.Value = ACPI_TO_INTEGER (AcpiOsGetThreadId()); /* Setup return buffer */ ReturnObj.Pointer = NULL; ReturnObj.Length = ACPI_ALLOCATE_BUFFER; Status = AcpiEvaluateObject (NULL, "\\_ERR", &ArgList, &ReturnObj); if (ACPI_SUCCESS (Status)) { if (ReturnObj.Pointer) { /* Override original status */ NewAmlStatus = (ACPI_STATUS) ((ACPI_OBJECT *) ReturnObj.Pointer)->Integer.Value; AcpiOsFree (ReturnObj.Pointer); } } else if (Status != AE_NOT_FOUND) { AcpiOsPrintf ("[AcpiExec] Could not execute _ERR method, %s\n", AcpiFormatException (Status)); } /* Global override */ if (AcpiGbl_IgnoreErrors) { NewAmlStatus = AE_OK; } if (NewAmlStatus != AmlStatus) { AcpiOsPrintf ("[AcpiExec] Exception override, new status %s\n", AcpiFormatException (NewAmlStatus)); } return (NewAmlStatus); } /****************************************************************************** * * FUNCTION: AeTableHandler * * PARAMETERS: Table handler * * RETURN: Status * * DESCRIPTION: System table handler for AcpiExec utility. * *****************************************************************************/ char *TableEvents[] = { "LOAD", "UNLOAD", "UNKNOWN" }; ACPI_STATUS AeTableHandler ( UINT32 Event, void *Table, void *Context) { if (Event > ACPI_NUM_TABLE_EVENTS) { Event = ACPI_NUM_TABLE_EVENTS; } /* TBD: could dump entire table header, need a header dump routine */ printf ("[AcpiExec] Table Event %s, [%4.4s] %p\n", TableEvents[Event], ((ACPI_TABLE_HEADER *) Table)->Signature, Table); return (AE_OK); } /****************************************************************************** * * FUNCTION: AeGpeHandler * * DESCRIPTION: GPE handler for acpiexec * *****************************************************************************/ UINT32 AeGpeHandler ( void *Context) { AcpiOsPrintf ("Received a GPE at handler\n"); return (0); } /****************************************************************************** * * FUNCTION: AeAttachedDataHandler * * DESCRIPTION: Handler for deletion of nodes with attached data (attached via * AcpiAttachData) * *****************************************************************************/ void AeAttachedDataHandler ( ACPI_HANDLE Object, void *Data) { ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Data); AcpiOsPrintf ("Received an attached data deletion on %4.4s\n", Node->Name.Ascii); } /****************************************************************************** * * FUNCTION: AeRegionInit * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Opregion init function. * *****************************************************************************/ ACPI_STATUS AeRegionInit ( ACPI_HANDLE RegionHandle, UINT32 Function, void *HandlerContext, void **RegionContext) { /* * Real simple, set the RegionContext to the RegionHandle */ *RegionContext = RegionHandle; return AE_OK; } /****************************************************************************** * * FUNCTION: AeInstallHandlers * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Install handlers for the AcpiExec utility. * *****************************************************************************/ ACPI_ADR_SPACE_TYPE SpaceId[] = {0, 1, 2, 3, 4, 5, 6, 7, 0x80}; #define AEXEC_NUM_REGIONS 9 ACPI_STATUS AeInstallHandlers (void) { ACPI_STATUS Status; UINT32 i; ACPI_HANDLE Handle; ACPI_FUNCTION_ENTRY (); Status = AcpiInstallTableHandler (AeTableHandler, NULL); if (ACPI_FAILURE (Status)) { printf ("Could not install table handler, %s\n", AcpiFormatException (Status)); } Status = AcpiInstallExceptionHandler (AeExceptionHandler); if (ACPI_FAILURE (Status)) { printf ("Could not install exception handler, %s\n", AcpiFormatException (Status)); } /* Install global notify handler */ Status = AcpiInstallNotifyHandler (ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, AeNotifyHandler, NULL); if (ACPI_FAILURE (Status)) { printf ("Could not install a global notify handler, %s\n", AcpiFormatException (Status)); } Status = AcpiInstallNotifyHandler (ACPI_ROOT_OBJECT, ACPI_DEVICE_NOTIFY, AeDeviceNotifyHandler, NULL); if (ACPI_FAILURE (Status)) { printf ("Could not install a global notify handler, %s\n", AcpiFormatException (Status)); } Status = AcpiGetHandle (NULL, "\\_SB", &Handle); if (ACPI_SUCCESS (Status)) { Status = AcpiInstallNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY, AeNotifyHandler, NULL); if (ACPI_FAILURE (Status)) { printf ("Could not install a notify handler, %s\n", AcpiFormatException (Status)); } Status = AcpiRemoveNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY, AeNotifyHandler); if (ACPI_FAILURE (Status)) { printf ("Could not remove a notify handler, %s\n", AcpiFormatException (Status)); } Status = AcpiInstallNotifyHandler (Handle, ACPI_ALL_NOTIFY, AeNotifyHandler, NULL); Status = AcpiRemoveNotifyHandler (Handle, ACPI_ALL_NOTIFY, AeNotifyHandler); Status = AcpiInstallNotifyHandler (Handle, ACPI_ALL_NOTIFY, AeNotifyHandler, NULL); if (ACPI_FAILURE (Status)) { printf ("Could not install a notify handler, %s\n", AcpiFormatException (Status)); } Status = AcpiAttachData (Handle, AeAttachedDataHandler, Handle); Status = AcpiDetachData (Handle, AeAttachedDataHandler); Status = AcpiAttachData (Handle, AeAttachedDataHandler, Handle); } else { printf ("No _SB_ found, %s\n", AcpiFormatException (Status)); } /* Set a handler for all supported operation regions */ for (i = 0; i < AEXEC_NUM_REGIONS; i++) { Status = AcpiRemoveAddressSpaceHandler (AcpiGbl_RootNode, SpaceId[i], AeRegionHandler); /* Install handler at the root object. * TBD: all default handlers should be installed here! */ Status = AcpiInstallAddressSpaceHandler (AcpiGbl_RootNode, SpaceId[i], AeRegionHandler, AeRegionInit, NULL); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Could not install an OpRegion handler for %s space(%u)", AcpiUtGetRegionName((UINT8) SpaceId[i]), SpaceId[i])); return (Status); } } /* * Initialize the global Region Handler space * MCW 3/23/00 */ AeRegions.NumberOfRegions = 0; AeRegions.RegionList = NULL; return Status; } /****************************************************************************** * * FUNCTION: AeRegionHandler * * PARAMETERS: Standard region handler parameters * * RETURN: Status * * DESCRIPTION: Test handler - Handles some dummy regions via memory that can * be manipulated in Ring 3. Simulates actual reads and writes. * *****************************************************************************/ ACPI_STATUS AeRegionHandler ( UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 BitWidth, UINT64 *Value, void *HandlerContext, void *RegionContext) { ACPI_OPERAND_OBJECT *RegionObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, RegionContext); UINT8 *Buffer = ACPI_CAST_PTR (UINT8, Value); ACPI_PHYSICAL_ADDRESS BaseAddress; ACPI_SIZE Length; BOOLEAN BufferExists; AE_REGION *RegionElement; void *BufferValue; ACPI_STATUS Status; UINT32 ByteWidth; UINT32 i; UINT8 SpaceId; ACPI_FUNCTION_NAME (AeRegionHandler); /* * If the object is not a region, simply return */ if (RegionObject->Region.Type != ACPI_TYPE_REGION) { return AE_OK; } /* * Region support can be disabled with the -r option. * We use this to support dynamically loaded tables where we pass a valid * address to the AML. */ if (AcpiGbl_DbOpt_NoRegionSupport) { BufferValue = ACPI_TO_POINTER (Address); ByteWidth = (BitWidth / 8); if (BitWidth % 8) { ByteWidth += 1; } goto DoFunction; } /* * Find the region's address space and length before searching * the linked list. */ BaseAddress = RegionObject->Region.Address; Length = (ACPI_SIZE) RegionObject->Region.Length; SpaceId = RegionObject->Region.SpaceId; ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, "Operation Region request on %s at 0x%X\n", AcpiUtGetRegionName (RegionObject->Region.SpaceId), (UINT32) Address)); switch (SpaceId) { case ACPI_ADR_SPACE_SYSTEM_IO: /* * For I/O space, exercise the port validation */ switch (Function & ACPI_IO_MASK) { case ACPI_READ: Status = AcpiHwReadPort (Address, (UINT32 *) Value, BitWidth); break; case ACPI_WRITE: Status = AcpiHwWritePort (Address, (UINT32) *Value, BitWidth); break; default: Status = AE_BAD_PARAMETER; break; } if (ACPI_FAILURE (Status)) { return (Status); } /* Now go ahead and simulate the hardware */ break; case ACPI_ADR_SPACE_SMBUS: Length = 0; switch (Function & ACPI_IO_MASK) { case ACPI_READ: switch (Function >> 16) { case AML_FIELD_ATTRIB_SMB_QUICK: case AML_FIELD_ATTRIB_SMB_SEND_RCV: case AML_FIELD_ATTRIB_SMB_BYTE: Length = 1; break; case AML_FIELD_ATTRIB_SMB_WORD: case AML_FIELD_ATTRIB_SMB_WORD_CALL: Length = 2; break; case AML_FIELD_ATTRIB_SMB_BLOCK: case AML_FIELD_ATTRIB_SMB_BLOCK_CALL: Length = 32; break; default: break; } break; case ACPI_WRITE: switch (Function >> 16) { case AML_FIELD_ATTRIB_SMB_QUICK: case AML_FIELD_ATTRIB_SMB_SEND_RCV: case AML_FIELD_ATTRIB_SMB_BYTE: case AML_FIELD_ATTRIB_SMB_WORD: case AML_FIELD_ATTRIB_SMB_BLOCK: Length = 0; break; case AML_FIELD_ATTRIB_SMB_WORD_CALL: Length = 2; break; case AML_FIELD_ATTRIB_SMB_BLOCK_CALL: Length = 32; break; default: break; } break; default: break; } for (i = 0; i < Length; i++) { Buffer[i+2] = (UINT8) (0xA0 + i); } Buffer[0] = 0x7A; Buffer[1] = (UINT8) Length; return (AE_OK); case ACPI_ADR_SPACE_IPMI: /* ACPI 4.0 */ AcpiOsPrintf ("AcpiExec: Received IPMI request: " "Address %X BaseAddress %X Length %X Width %X BufferLength %u\n", (UINT32) Address, (UINT32) BaseAddress, Length, BitWidth, Buffer[1]); /* * Regardless of a READ or WRITE, this handler is passed a 66-byte * buffer in which to return the IPMI status/length/data. * * Return some example data to show use of the bidirectional buffer */ Buffer[0] = 0; /* Status byte */ Buffer[1] = 64; /* Return buffer data length */ Buffer[2] = 0; /* Completion code */ Buffer[3] = 0x34; /* Power measurement */ Buffer[4] = 0x12; /* Power measurement */ Buffer[65] = 0xEE; /* last buffer byte */ return (AE_OK); default: break; } /* * Search through the linked list for this region's buffer */ BufferExists = FALSE; RegionElement = AeRegions.RegionList; if (AeRegions.NumberOfRegions) { while (!BufferExists && RegionElement) { if (RegionElement->Address == BaseAddress && RegionElement->Length == Length && RegionElement->SpaceId == SpaceId) { BufferExists = TRUE; } else { RegionElement = RegionElement->NextRegion; } } } /* * If the Region buffer does not exist, create it now */ if (!BufferExists) { /* * Do the memory allocations first */ RegionElement = AcpiOsAllocate (sizeof (AE_REGION)); if (!RegionElement) { return AE_NO_MEMORY; } RegionElement->Buffer = AcpiOsAllocate (Length); if (!RegionElement->Buffer) { AcpiOsFree (RegionElement); return AE_NO_MEMORY; } /* Initialize the region with the default fill value */ ACPI_MEMSET (RegionElement->Buffer, AcpiGbl_RegionFillValue, Length); RegionElement->Address = BaseAddress; RegionElement->Length = Length; RegionElement->SpaceId = SpaceId; RegionElement->NextRegion = NULL; /* * Increment the number of regions and put this one * at the head of the list as it will probably get accessed * more often anyway. */ AeRegions.NumberOfRegions += 1; if (AeRegions.RegionList) { RegionElement->NextRegion = AeRegions.RegionList; } AeRegions.RegionList = RegionElement; } /* * Calculate the size of the memory copy */ ByteWidth = (BitWidth / 8); if (BitWidth % 8) { ByteWidth += 1; } /* * The buffer exists and is pointed to by RegionElement. * We now need to verify the request is valid and perform the operation. * * NOTE: RegionElement->Length is in bytes, therefore it we compare against * ByteWidth (see above) */ if (((UINT64) Address + ByteWidth) > ((UINT64)(RegionElement->Address) + RegionElement->Length)) { ACPI_WARNING ((AE_INFO, "Request on [%4.4s] is beyond region limit Req-0x%X+0x%X, Base=0x%X, Len-0x%X", (RegionObject->Region.Node)->Name.Ascii, (UINT32) Address, ByteWidth, (UINT32)(RegionElement->Address), RegionElement->Length)); return AE_AML_REGION_LIMIT; } /* * Get BufferValue to point to the "address" in the buffer */ BufferValue = ((UINT8 *) RegionElement->Buffer + ((UINT64) Address - (UINT64) RegionElement->Address)); DoFunction: /* * Perform a read or write to the buffer space */ switch (Function) { case ACPI_READ: /* * Set the pointer Value to whatever is in the buffer */ ACPI_MEMCPY (Value, BufferValue, ByteWidth); break; case ACPI_WRITE: /* * Write the contents of Value to the buffer */ ACPI_MEMCPY (BufferValue, Value, ByteWidth); break; default: return AE_BAD_PARAMETER; } return AE_OK; }