reactos/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: iospace.c,v 1.23 2003/12/30 18:52:05 fireball Exp $
  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    DPRINT("MmMapIoSpace(%lx, %d, %d)\n", PhysicalAddress, NumberOfBytes, CacheEnable);
  80
  81    MmLockAddressSpace(MmGetKernelAddressSpace());
  82    Result = NULL;
  83    Status = MmCreateMemoryArea (NULL,
  84                                 MmGetKernelAddressSpace(),
  85                                 MEMORY_AREA_IO_MAPPING,
  86                                 &Result,
  87                                 NumberOfBytes,
  88                                 0,
  89                                 &marea,
  90                                 FALSE,
  91                                 FALSE);
  92    MmUnlockAddressSpace(MmGetKernelAddressSpace());
  93
  94    if (!NT_SUCCESS(Status))
  95      {
  96         DPRINT("MmMapIoSpace failed (%lx)\n", Status);
  97         return (NULL);
  98      }
  99    Attributes = PAGE_EXECUTE_READWRITE | PAGE_SYSTEM;
 100    if (!CacheEnable)
 101      {
 102         Attributes |= (PAGE_NOCACHE | PAGE_WRITETHROUGH);
 103      }
 104    for (i = 0; (i < (PAGE_ROUND_UP(NumberOfBytes) / PAGE_SIZE)); i++)
 105      {
 106 #if !defined(__GNUC__)
 107         PHYSICAL_ADDRESS dummyJunkNeeded;
 108         dummyJunkNeeded.QuadPart = PhysicalAddress.QuadPart + (i * PAGE_SIZE);
 109 #endif
 110         Status =
 111           MmCreateVirtualMappingForKernel((char*)Result + (i * PAGE_SIZE),
 112                                           Attributes,
 113 #if defined(__GNUC__)
 114                                           (PHYSICAL_ADDRESS)
 115                                           (PhysicalAddress.QuadPart +
 116                                            (i * PAGE_SIZE))
 117 #else
 118                                           dummyJunkNeeded
 119 #endif
 120                                           );
 121         if (!NT_SUCCESS(Status))
 122           {
 123              DbgPrint("Unable to create virtual mapping\n");
 124              KEBUGCHECK(0);
 125           }
 126 #if defined(__GNUC__)
 127         MmMarkPageMapped((PHYSICAL_ADDRESS) (PhysicalAddress.QuadPart +
 128                                              (i * PAGE_SIZE)));
 129 #else
 130         MmMarkPageMapped(dummyJunkNeeded);
 131 #endif
 132      }
 133    return ((PVOID)((char*)Result + PhysicalAddress.QuadPart % PAGE_SIZE));
 134 }
 135
 136
 137 /**********************************************************************
 138  * NAME                                                 EXPORTED
 139  *      MmUnmapIoSpace@8
 140  *
 141  * DESCRIPTION
 142  *      Unmaps a physical memory range from system space.
 143  *
 144  * ARGUMENTS
 145  *      BaseAddress
 146  *              The base virtual address which maps the region;
 147  *
 148  *      NumberOfBytes
 149  *              Number of bytes to unmap.
 150  *
 151  * RETURN VALUE
 152  *      None.
 153  *
 154  * NOTE
 155  *      Code taken from ntoskrnl/mm/special.c.
 156  *
 157  * REVISIONS
 158  *
 159  * @implemented
 160  */
 161 VOID STDCALL
 162 MmUnmapIoSpace (IN PVOID BaseAddress,
 163                 IN ULONG NumberOfBytes)
 164 {
 165    MmLockAddressSpace(MmGetKernelAddressSpace());
 166    MmFreeMemoryArea(MmGetKernelAddressSpace(),
 167                     (PVOID)(((ULONG)BaseAddress / PAGE_SIZE) * PAGE_SIZE),
 168                     NumberOfBytes,
 169                     NULL,
 170                     NULL);
 171    MmUnlockAddressSpace(MmGetKernelAddressSpace());
 172 }
 173
 174
 175 /**********************************************************************
 176  * NAME                                                 EXPORTED
 177  *      MmMapVideoDisplay@16
 178  *
 179  * @implemented
 180  */
 181 PVOID STDCALL
 182 MmMapVideoDisplay (IN   PHYSICAL_ADDRESS        PhysicalAddress,
 183                    IN   ULONG                   NumberOfBytes,
 184                    IN   MEMORY_CACHING_TYPE     CacheType)
 185 {
 186   return MmMapIoSpace (PhysicalAddress, NumberOfBytes, (BOOLEAN)CacheType);
 187 }
 188
 189
 190 /*
 191  * @implemented
 192  */
 193 VOID STDCALL
 194 MmUnmapVideoDisplay (IN PVOID   BaseAddress,
 195                      IN ULONG   NumberOfBytes)
 196 {
 197   MmUnmapIoSpace (BaseAddress, NumberOfBytes);
 198 }
 199
 200
 201 /* EOF */