vidix/sysdep/libdha_win32.c

   1 /*
   2   MAPDEV.h - include file for VxD MAPDEV
   3   Copyright (c) 1996 Vireo Software, Inc.
   4   Modified for libdha by Nick Kurshev.
   5 */
   6
   7 #include <windows.h>
   8 #include <ddk/ntddk.h>
   9 #include "vidix/dhahelperwin/dhahelper.h"
  10
  11 /*
  12   This is the request structure that applications use
  13   to request services from the MAPDEV VxD.
  14 */
  15
  16 typedef struct MapDevRequest
  17 {
  18         DWORD   mdr_ServiceID;          /* supplied by caller */
  19         LPVOID  mdr_PhysicalAddress;    /* supplied by caller */
  20         DWORD   mdr_SizeInBytes;        /* supplied by caller */
  21         LPVOID  mdr_LinearAddress;      /* returned by VxD */
  22         WORD    mdr_Selector;           /* returned if 16-bit caller */
  23         WORD    mdr_Status;             /* MDR_xxxx code below */
  24 } MAPDEVREQUEST, *PMAPDEVREQUEST;
  25
  26 #define MDR_SERVICE_MAP         CTL_CODE(FILE_DEVICE_UNKNOWN, 1, METHOD_NEITHER, FILE_ANY_ACCESS)
  27 #define MDR_SERVICE_UNMAP       CTL_CODE(FILE_DEVICE_UNKNOWN, 2, METHOD_NEITHER, FILE_ANY_ACCESS)
  28
  29 #define MDR_STATUS_SUCCESS      1
  30 #define MDR_STATUS_ERROR        0
  31 /*#include "winioctl.h"*/
  32 #define FILE_DEVICE_UNKNOWN             0x00000022
  33 #define METHOD_NEITHER                  3
  34
  35
  36 int IsWinNT(void) {
  37   OSVERSIONINFO OSVersionInfo;
  38   OSVersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
  39   GetVersionEx(&OSVersionInfo);
  40   return OSVersionInfo.dwPlatformId == VER_PLATFORM_WIN32_NT;
  41 }
  42
  43 static HANDLE hDriver = INVALID_HANDLE_VALUE;
  44
  45
  46 /* Memory Map a piece of Real Memory */
  47 void *map_phys_mem(unsigned long base, unsigned long size) {
  48   if(!IsWinNT()){
  49   HANDLE hDevice ;
  50   PVOID inBuf[1] ;              /* buffer for struct pointer to VxD */
  51   DWORD cbBytesReturned ;       /* count of bytes returned from VxD */
  52   MAPDEVREQUEST req ;           /* map device request structure */
  53   const PCHAR VxDName = "\\\\.\\MAPDEV.VXD" ;
  54   const PCHAR VxDNameAlreadyLoaded = "\\\\.\\MAPDEV" ;
  55
  56   hDevice = CreateFile(VxDName, 0,0,0,
  57                        CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE, 0) ;
  58   if (hDevice == INVALID_HANDLE_VALUE)
  59     hDevice = CreateFile(VxDNameAlreadyLoaded, 0,0,0,
  60                          CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE, 0) ;
  61   if (hDevice == INVALID_HANDLE_VALUE) {
  62     fprintf(stderr, "Cannot open driver, error=%08lx\n", GetLastError()) ;
  63     exit(1) ; }
  64
  65   req.mdr_ServiceID = MDR_SERVICE_MAP ;
  66   req.mdr_PhysicalAddress = (PVOID)base ;
  67   req.mdr_SizeInBytes = size ;
  68   inBuf[0] = &req ;
  69
  70   if ( ! DeviceIoControl(hDevice, MDR_SERVICE_MAP, inBuf, sizeof(PVOID),
  71          NULL, 0, &cbBytesReturned, NULL) ) {
  72     fprintf(stderr, "Failed to map device\n") ; exit(1) ; }
  73
  74   return (void*)req.mdr_LinearAddress ;
  75   }
  76   else{
  77     dhahelper_t dhahelper_priv;
  78     DWORD dwBytesReturned;
  79     dhahelper_priv.size = size;
  80     dhahelper_priv.base = base;
  81     if(hDriver==INVALID_HANDLE_VALUE)hDriver = CreateFile("\\\\.\\DHAHELPER",GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
  82     if (!DeviceIoControl(hDriver, IOCTL_DHAHELPER_MAPPHYSTOLIN, &dhahelper_priv,sizeof(dhahelper_t), &dhahelper_priv, sizeof(dhahelper_t),&dwBytesReturned, NULL)){
  83       fprintf(stderr,"Unable to map the requested memory region.\n");
  84       return NULL;
  85     }
  86     else return dhahelper_priv.ptr;
  87   }
  88 }
  89
  90 void unmap_phys_mem(void *ptr, unsigned long size) {
  91   if(IsWinNT()){
  92     dhahelper_t dhahelper_priv;
  93     DWORD dwBytesReturned;
  94     dhahelper_priv.ptr = ptr;
  95     DeviceIoControl(hDriver, IOCTL_DHAHELPER_UNMAPPHYSADDR, &dhahelper_priv,sizeof(dhahelper_t), NULL, 0, &dwBytesReturned, NULL);
  96   }
  97 }