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  * @implemented
  67  */
  68 PVOID STDCALL
  69 MmMapIoSpace (IN PHYSICAL_ADDRESS PhysicalAddress,
  70               IN ULONG NumberOfBytes,
  71               IN BOOLEAN CacheEnable)
  72 {
  73    PVOID Result;
  74    MEMORY_AREA* marea;
  75    NTSTATUS Status;
  76    ULONG i;
  77    ULONG Attributes;
  78
  79    MmLockAddressSpace(MmGetKernelAddressSpace());
  80    Result = NULL;
  81    Status = MmCreateMemoryArea (NULL,
  82                                 MmGetKernelAddressSpace(),
  83                                 MEMORY_AREA_IO_MAPPING,
  84                                 &Result,
  85                                 NumberOfBytes,
  86                                 0,
  87                                 &marea,
  88                                 FALSE,
  89                                 FALSE);
  90    MmUnlockAddressSpace(MmGetKernelAddressSpace());
  91
  92    if (!NT_SUCCESS(STATUS_SUCCESS))
  93      {
  94         return (NULL);
  95      }
  96    Attributes = PAGE_EXECUTE_READWRITE | PAGE_SYSTEM;
  97    if (!CacheEnable)
  98      {
  99         Attributes |= (PAGE_NOCACHE | PAGE_WRITETHROUGH);
 100      }
 101    for (i = 0; (i < (PAGE_ROUND_UP(NumberOfBytes) / PAGE_SIZE)); i++)
 102      {
 103         Status =
 104           MmCreateVirtualMappingForKernel(Result + (i * PAGE_SIZE),
 105                                           Attributes,
 106                                           (PHYSICAL_ADDRESS)
 107                                           (PhysicalAddress.QuadPart +
 108                                            (i * PAGE_SIZE)));
 109         if (!NT_SUCCESS(Status))
 110           {
 111              DbgPrint("Unable to create virtual mapping\n");
 112              KEBUGCHECK(0);
 113           }
 114         MmMarkPageMapped((PHYSICAL_ADDRESS) (PhysicalAddress.QuadPart +
 115                                              (i * PAGE_SIZE)));
 116      }
 117    return ((PVOID)(Result + PhysicalAddress.QuadPart % PAGE_SIZE));
 118 }
 119
 120
 121 /**********************************************************************
 122  * NAME                                                 EXPORTED
 123  *      MmUnmapIoSpace@8
 124  *
 125  * DESCRIPTION
 126  *      Unmaps a physical memory range from system space.
 127  *
 128  * ARGUMENTS
 129  *      BaseAddress
 130  *              The base virtual address which maps the region;
 131  *
 132  *      NumberOfBytes
 133  *              Number of bytes to unmap.
 134  *
 135  * RETURN VALUE
 136  *      None.
 137  *
 138  * NOTE
 139  *      Code taken from ntoskrnl/mm/special.c.
 140  *
 141  * REVISIONS
 142  *
 143  * @implemented
 144  */
 145 VOID STDCALL
 146 MmUnmapIoSpace (IN PVOID BaseAddress,
 147                 IN ULONG NumberOfBytes)
 148 {
 149    MmLockAddressSpace(MmGetKernelAddressSpace());
 150    MmFreeMemoryArea(MmGetKernelAddressSpace(),
 151                     (PVOID)(((ULONG)BaseAddress / PAGE_SIZE) * PAGE_SIZE),
 152                     NumberOfBytes,
 153                     NULL,
 154                     NULL);
 155    MmUnlockAddressSpace(MmGetKernelAddressSpace());
 156 }
 157
 158
 159 /**********************************************************************
 160  * NAME                                                 EXPORTED
 161  *      MmMapVideoDisplay@16
 162  *
 163  * @implemented
 164  */
 165 PVOID STDCALL
 166 MmMapVideoDisplay (IN   PHYSICAL_ADDRESS        PhysicalAddress,
 167                    IN   ULONG                   NumberOfBytes,
 168                    IN   MEMORY_CACHING_TYPE     CacheType)
 169 {
 170   return MmMapIoSpace (PhysicalAddress, NumberOfBytes, CacheType);
 171 }
 172
 173
 174 /*
 175  * @implemented
 176  */
 177 VOID STDCALL
 178 MmUnmapVideoDisplay (IN PVOID   BaseAddress,
 179                      IN ULONG   NumberOfBytes)
 180 {
 181   MmUnmapIoSpace (BaseAddress, NumberOfBytes);
 182 }
 183
 184
 185 /* EOF */