ntoskrnl/mm/iospace.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * PROJECT:         ReactOS kernel
  22  * FILE:            ntoskrnl/mm/iospace.c
  23  * PURPOSE:         Mapping I/O space
  24  * PROGRAMMER:      David Welch (welch@mcmail.com)
  25  * UPDATE HISTORY:
  26  *                  Created 22/05/98
  27  */
  28
  29 /* INCLUDES *****************************************************************/
  30
  31 #include <ddk/ntddk.h>
  32 #include <internal/mm.h>
  33 #include <internal/ps.h>
  34
  35 #define NDEBUG
  36 #include <internal/debug.h>
  37
  38 /* FUNCTIONS *****************************************************************/
  39
  40 /**********************************************************************
  41  * NAME                                                 EXPORTED
  42  *      MmMapIoSpace@16
  43  *
  44  * DESCRIPTION
  45  *      Maps a physical memory range into system space.
  46  *
  47  * ARGUMENTS
  48  *      PhysicalAddress
  49  *              First physical address to map;
  50  *
  51  *      NumberOfBytes
  52  *              Number of bytes to map;
  53  *
  54  *      CacheEnable
  55  *              TRUE if the range can be cached.
  56  *
  57  * RETURN VALUE
  58  *      The base virtual address which maps the region.
  59  *
  60  * NOTE
  61  *      Description moved here from include/ddk/mmfuncs.h.
  62  *      Code taken from ntoskrnl/mm/special.c.
  63  *
  64  * REVISIONS
  65  *
  66  */
  67 PVOID STDCALL
  68 MmMapIoSpace (IN PHYSICAL_ADDRESS PhysicalAddress,
  69               IN ULONG NumberOfBytes,
  70               IN BOOLEAN CacheEnable)
  71 {
  72    PVOID Result;
  73    MEMORY_AREA* marea;
  74    NTSTATUS Status;
  75    ULONG i;
  76    ULONG Attributes;
  77
  78    MmLockAddressSpace(MmGetKernelAddressSpace());
  79    Result = NULL;
  80    Status = MmCreateMemoryArea (NULL,
  81                                 MmGetKernelAddressSpace(),
  82                                 MEMORY_AREA_IO_MAPPING,
  83                                 &Result,
  84                                 NumberOfBytes,
  85                                 0,
  86                                 &marea,
  87                                 FALSE);
  88    MmUnlockAddressSpace(MmGetKernelAddressSpace());
  89
  90    if (!NT_SUCCESS(STATUS_SUCCESS))
  91      {
  92         return (NULL);
  93      }
  94    Attributes = PAGE_EXECUTE_READWRITE | PAGE_SYSTEM;
  95    if (!CacheEnable)
  96      {
  97         Attributes |= (PAGE_NOCACHE | PAGE_WRITETHROUGH);
  98      }
  99    for (i = 0; (i < (PAGE_ROUND_UP(NumberOfBytes) / PAGE_SIZE)); i++)
 100      {
 101         Status =
 102           MmCreateVirtualMappingForKernel(Result + (i * PAGE_SIZE),
 103                                           Attributes,
 104                                           (PHYSICAL_ADDRESS)
 105                                           (PhysicalAddress.QuadPart +
 106                                            (i * PAGE_SIZE)));
 107         if (!NT_SUCCESS(Status))
 108           {
 109              DbgPrint("Unable to create virtual mapping\n");
 110              KeBugCheck(0);
 111           }
 112      }
 113    return ((PVOID)(Result + PhysicalAddress.QuadPart % PAGE_SIZE));
 114 }
 115
 116
 117 /**********************************************************************
 118  * NAME                                                 EXPORTED
 119  *      MmUnmapIoSpace@8
 120  *
 121  * DESCRIPTION
 122  *      Unmaps a physical memory range from system space.
 123  *
 124  * ARGUMENTS
 125  *      BaseAddress
 126  *              The base virtual address which maps the region;
 127  *
 128  *      NumberOfBytes
 129  *              Number of bytes to unmap.
 130  *
 131  * RETURN VALUE
 132  *      None.
 133  *
 134  * NOTE
 135  *      Code taken from ntoskrnl/mm/special.c.
 136  *
 137  * REVISIONS
 138  *
 139  */
 140 VOID STDCALL
 141 MmUnmapIoSpace (IN PVOID BaseAddress,
 142                 IN ULONG NumberOfBytes)
 143 {
 144    MmLockAddressSpace(MmGetKernelAddressSpace());
 145    MmFreeMemoryArea(MmGetKernelAddressSpace(),
 146                     (PVOID)(((ULONG)BaseAddress / PAGE_SIZE) * PAGE_SIZE),
 147                     NumberOfBytes,
 148                     NULL,
 149                     NULL);
 150    MmUnlockAddressSpace(MmGetKernelAddressSpace());
 151 }
 152
 153
 154 /**********************************************************************
 155  * NAME                                                 EXPORTED
 156  *      MmMapVideoDisplay@16
 157  */
 158 PVOID STDCALL
 159 MmMapVideoDisplay (IN   PHYSICAL_ADDRESS        PhysicalAddress,
 160                    IN   ULONG                   NumberOfBytes,
 161                    IN   MEMORY_CACHING_TYPE     CacheType)
 162 {
 163   return MmMapIoSpace (PhysicalAddress, NumberOfBytes, CacheType);
 164 }
 165
 166
 167 VOID STDCALL
 168 MmUnmapVideoDisplay (IN PVOID   BaseAddress,
 169                      IN ULONG   NumberOfBytes)
 170 {
 171   MmUnmapIoSpace (BaseAddress, NumberOfBytes);
 172 }
 173
 174
 175 /* EOF */