reactos/ntoskrnl/mm/aspace.c

   1 /* $Id: aspace.c,v 1.2 2000/04/07 02:24:00 dwelch Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/mm/aspace.c
   6  * PURPOSE:         Manages address spaces
   7  * PROGRAMMER:      David Welch (welch@cwcom.net)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ddk/ntddk.h>
  15 #include <internal/mm.h>
  16
  17 #include <internal/debug.h>
  18
  19 /* GLOBALS ******************************************************************/
  20
  21 static MADDRESS_SPACE KernelAddressSpace;
  22
  23 /* FUNCTIONS *****************************************************************/
  24
  25 VOID MmLockAddressSpace(PMADDRESS_SPACE AddressSpace)
  26 {
  27    (VOID)KeWaitForMutexObject(&AddressSpace->Lock,
  28                               0,
  29                               KernelMode,
  30                               FALSE,
  31                               NULL);
  32 }
  33
  34 VOID MmUnlockAddressSpace(PMADDRESS_SPACE AddressSpace)
  35 {
  36    KeReleaseMutex(&AddressSpace->Lock, FALSE);
  37 }
  38
  39 VOID MmInitializeKernelAddressSpace(VOID)
  40 {
  41    MmInitializeAddressSpace(NULL, &KernelAddressSpace);
  42    KernelAddressSpace.LowestAddress = KERNEL_BASE;
  43 }
  44
  45 PMADDRESS_SPACE MmGetCurrentAddressSpace(VOID)
  46 {
  47    return(&PsGetCurrentProcess()->Pcb.AddressSpace);
  48 }
  49
  50 PMADDRESS_SPACE MmGetKernelAddressSpace(VOID)
  51 {
  52    return(&KernelAddressSpace);
  53 }
  54
  55 NTSTATUS MmInitializeAddressSpace(PEPROCESS Process,
  56                                   PMADDRESS_SPACE AddressSpace)
  57 {
  58    InitializeListHead(&AddressSpace->MAreaListHead);
  59    KeInitializeMutex(&AddressSpace->Lock, 1);
  60    AddressSpace->LowestAddress = MM_LOWEST_USER_ADDRESS;
  61    AddressSpace->Process = Process;
  62    return(STATUS_SUCCESS);
  63 }
  64
  65 NTSTATUS MmDestroyAddressSpace(PMADDRESS_SPACE AddressSpace)
  66 {
  67    return(STATUS_SUCCESS);
  68 }