mirror of https://github.com/mpv-player/mpv
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/*
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MAPDEV.h - include file for VxD MAPDEV
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Copyright (c) 1996 Vireo Software, Inc.
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Modified for libdha by Nick Kurshev.
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*/
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#include <windows.h>
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#include <ddk/ntddk.h>
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#include "vidix/dhahelperwin/dhahelper.h"
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/*
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This is the request structure that applications use
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to request services from the MAPDEV VxD.
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*/
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typedef struct MapDevRequest
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{
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DWORD mdr_ServiceID; /* supplied by caller */
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LPVOID mdr_PhysicalAddress; /* supplied by caller */
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DWORD mdr_SizeInBytes; /* supplied by caller */
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LPVOID mdr_LinearAddress; /* returned by VxD */
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WORD mdr_Selector; /* returned if 16-bit caller */
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WORD mdr_Status; /* MDR_xxxx code below */
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} MAPDEVREQUEST, *PMAPDEVREQUEST;
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#define MDR_SERVICE_MAP CTL_CODE(FILE_DEVICE_UNKNOWN, 1, METHOD_NEITHER, FILE_ANY_ACCESS)
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#define MDR_SERVICE_UNMAP CTL_CODE(FILE_DEVICE_UNKNOWN, 2, METHOD_NEITHER, FILE_ANY_ACCESS)
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#define MDR_STATUS_SUCCESS 1
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#define MDR_STATUS_ERROR 0
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/*#include "winioctl.h"*/
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#define FILE_DEVICE_UNKNOWN 0x00000022
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#define METHOD_NEITHER 3
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int IsWinNT(){
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OSVERSIONINFO OSVersionInfo;
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OSVersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
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GetVersionEx(&OSVersionInfo);
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return OSVersionInfo.dwPlatformId == VER_PLATFORM_WIN32_NT;
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}
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static HANDLE hDriver = INVALID_HANDLE_VALUE;
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/* Memory Map a piece of Real Memory */
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void *map_phys_mem(unsigned long base, unsigned long size) {
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if(!IsWinNT()){
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HANDLE hDevice ;
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PVOID inBuf[1] ; /* buffer for struct pointer to VxD */
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DWORD cbBytesReturned ; /* count of bytes returned from VxD */
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MAPDEVREQUEST req ; /* map device request structure */
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const PCHAR VxDName = "\\\\.\\MAPDEV.VXD" ;
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const PCHAR VxDNameAlreadyLoaded = "\\\\.\\MAPDEV" ;
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hDevice = CreateFile(VxDName, 0,0,0,
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CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE, 0) ;
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if (hDevice == INVALID_HANDLE_VALUE)
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hDevice = CreateFile(VxDNameAlreadyLoaded, 0,0,0,
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CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE, 0) ;
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if (hDevice == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "Cannot open driver, error=%08lx\n", GetLastError()) ;
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exit(1) ; }
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req.mdr_ServiceID = MDR_SERVICE_MAP ;
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req.mdr_PhysicalAddress = (PVOID)base ;
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req.mdr_SizeInBytes = size ;
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inBuf[0] = &req ;
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if ( ! DeviceIoControl(hDevice, MDR_SERVICE_MAP, inBuf, sizeof(PVOID),
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NULL, 0, &cbBytesReturned, NULL) ) {
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fprintf(stderr, "Failed to map device\n") ; exit(1) ; }
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return (void*)req.mdr_LinearAddress ;
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}
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else{
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dhahelper_t dhahelper_priv;
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DWORD dwBytesReturned;
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dhahelper_priv.size = size;
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dhahelper_priv.base = base;
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if(hDriver==INVALID_HANDLE_VALUE)hDriver = CreateFile("\\\\.\\DHAHELPER",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
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if (!DeviceIoControl(hDriver, IOCTL_DHAHELPER_MAPPHYSTOLIN, &dhahelper_priv,sizeof(dhahelper_t), &dhahelper_priv, sizeof(dhahelper_t),&dwBytesReturned, NULL)){
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fprintf(stderr,"Unable to map the requested memory region.\n");
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return NULL;
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}
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else return dhahelper_priv.ptr;
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}
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}
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void unmap_phys_mem(void *ptr, unsigned long size) {
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if(IsWinNT()){
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dhahelper_t dhahelper_priv;
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DWORD dwBytesReturned;
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dhahelper_priv.ptr = ptr;
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DeviceIoControl(hDriver, IOCTL_DHAHELPER_UNMAPPHYSADDR, &dhahelper_priv,sizeof(dhahelper_t), NULL, 0, &dwBytesReturned, NULL);
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}
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}
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