130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
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/*** vxd.c - ACPITAB.VXD related functions
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*
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* Copyright (c) 1996,1997 Microsoft Corporation
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* Author: Michael Tsang (MikeTs)
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* Created: 10/09/97
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*
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* MODIFICATION HISTORY
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*/
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#ifdef ___UNASM
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#pragma warning (disable: 4201 4214 4514)
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typedef unsigned __int64 ULONGLONG;
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#define LOCAL __cdecl
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#define EXPORT __cdecl
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#include <stdarg.h>
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#define _X86_
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#include <windef.h>
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#include <winbase.h>
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#define EXCL_BASEDEF
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#include "aslp.h"
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#include "..\acpitab\acpitab.h"
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/***LP OpenVxD - Open ACPITAB.VXD
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*
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* ENTRY
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* None
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*
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* EXIT-SUCCESS
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* returns VxD handle
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* EXIT-FAILURE
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* returns NULL
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*/
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HANDLE LOCAL OpenVxD(VOID)
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{
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HANDLE hVxD;
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DWORD dwVersion;
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ENTER((2, "OpenVxD()\n"));
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if ((hVxD = CreateFile(ACPITAB_VXD_NAME, 0, 0, NULL, 0,
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FILE_FLAG_DELETE_ON_CLOSE, NULL)) ==
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INVALID_HANDLE_VALUE)
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{
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hVxD = NULL;
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}
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else if (!DeviceIoControl(hVxD, ACPITAB_DIOC_GETVERSION, NULL, 0,
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&dwVersion, sizeof(dwVersion), NULL, NULL) ||
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(dwVersion != (ACPITAB_MAJOR_VER << 8) | ACPITAB_MINOR_VER))
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{
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ERROR(("OpenVxD: version error"));
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CloseVxD(hVxD);
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hVxD = NULL;
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}
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EXIT((2, "OpenVxD=%x\n", hVxD));
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return hVxD;
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} //OpenVxD
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/***LP CloseVxD - Close the VxD
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*
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* ENTRY
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* hVxD - VxD handle
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*
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* EXIT
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* None
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*/
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VOID LOCAL CloseVxD(HANDLE hVxD)
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{
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ENTER((2, "CloseVxD(hVxD=%x)\n", hVxD));
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CloseHandle(hVxD);
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EXIT((2, "CloseVxD!\n"));
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} //CloseVxD
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/***LP GetTable - Get table
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*
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* ENTRY
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* hVxD - VxD handle
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* dwTabSig - table signature
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*
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* EXIT-SUCCESS
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* returns pointer to table
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* EXIT-FAILURE
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* returns NULL
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*/
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PBYTE LOCAL GetTable(HANDLE hVxD, DWORD dwTabSig)
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{
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PBYTE pb = NULL;
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TABINFO TabInfo;
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ENTER((2, "GetTable(hVxD=%x,TabSig=%x)\n", hVxD, dwTabSig));
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TabInfo.dwTabSig = dwTabSig;
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if (DeviceIoControl(hVxD, ACPITAB_DIOC_GETTABINFO, NULL, 0, &TabInfo,
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sizeof(TabInfo), NULL, NULL))
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{
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if ((pb = MEMALLOC(TabInfo.dh.Length)) != NULL)
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{
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if (DeviceIoControl(hVxD, ACPITAB_DIOC_GETTABLE,
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(PVOID)TabInfo.dwPhyAddr, 0, pb,
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TabInfo.dh.Length, NULL, NULL) == 0)
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{
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ERROR(("GetTable: failed to get table. (rc=%x)",
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GetLastError()));
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MEMFREE(pb);
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pb = NULL;
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}
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}
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else
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{
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ERROR(("GetTable: failed to allocate table buffer"));
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}
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}
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else
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{
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ERROR(("GetTable: failed to get table info. (rc=%x)", GetLastError()));
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}
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EXIT((2, "GetTable=%x\n", pb));
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return pb;
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} //GetTable
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#endif //ifdef __UNASM
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