reactos/ntoskrnl/mm/ARM3/mmsup.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            ntoskrnl/mm/ARM3/mmsup.c
   5  * PURPOSE:         ARM Memory Manager Support Routines
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 #line 15 "ARM³::MMSUP"
  16 #define MODULE_INVOLVED_IN_ARM3
  17 #include "../ARM3/miarm.h"
  18
  19 /* GLOBALS ********************************************************************/
  20
  21 BOOLEAN IsThisAnNtAsSystem = FALSE;
  22 MM_SYSTEMSIZE MmSystemSize = MmSmallSystem;
  23
  24 /* PUBLIC FUNCTIONS ***********************************************************/
  25
  26 /*
  27  * @unimplemented
  28  */
  29 NTSTATUS
  30 NTAPI
  31 MmMapUserAddressesToPage(IN PVOID BaseAddress,
  32                          IN SIZE_T NumberOfBytes,
  33                          IN PVOID PageAddress)
  34 {
  35     UNIMPLEMENTED;
  36     return STATUS_NOT_IMPLEMENTED;
  37 }
  38
  39 /*
  40  * @unimplemented
  41  */
  42 NTSTATUS
  43 NTAPI
  44 MmAdjustWorkingSetSize(IN SIZE_T WorkingSetMinimumInBytes,
  45                        IN SIZE_T WorkingSetMaximumInBytes,
  46                        IN ULONG SystemCache,
  47                        IN BOOLEAN IncreaseOkay)
  48 {
  49     UNIMPLEMENTED;
  50     return STATUS_NOT_IMPLEMENTED;
  51 }
  52
  53 /*
  54  * @unimplemented
  55  */
  56 BOOLEAN
  57 NTAPI
  58 MmSetAddressRangeModified(IN PVOID Address,
  59                           IN SIZE_T Length)
  60 {
  61    UNIMPLEMENTED;
  62    return FALSE;
  63 }
  64
  65 /*
  66  * @implemented
  67  */
  68 BOOLEAN
  69 NTAPI
  70 MmIsAddressValid(IN PVOID VirtualAddress)
  71 {
  72     //
  73     // Just check the Valid bit in the Address' PDE and PTE
  74     //
  75     if ((MiAddressToPde(VirtualAddress)->u.Hard.Valid == 0) ||
  76         (MiAddressToPte(VirtualAddress)->u.Hard.Valid == 0))
  77     {
  78         //
  79         // Attempting to access this page is guranteed to result in a page fault
  80         //
  81         return FALSE;
  82     }
  83
  84     //
  85     // This address is valid now, but it will only stay so if the caller holds
  86     // the PFN lock
  87     //
  88     return TRUE;
  89 }
  90
  91 /*
  92  * @unimplemented
  93  */
  94 BOOLEAN
  95 NTAPI
  96 MmIsNonPagedSystemAddressValid(IN PVOID VirtualAddress)
  97 {
  98     DPRINT1("WARNING: %s returns bogus result\n", __FUNCTION__);
  99     return MmIsAddressValid(VirtualAddress);
 100 }
 101
 102 /*
 103  * @unimplemented
 104  */
 105 NTSTATUS
 106 NTAPI
 107 MmSetBankedSection(IN HANDLE ProcessHandle,
 108                    IN PVOID VirtualAddress,
 109                    IN ULONG BankLength,
 110                    IN BOOLEAN ReadWriteBank,
 111                    IN PVOID BankRoutine,
 112                    IN PVOID Context)
 113 {
 114     UNIMPLEMENTED;
 115     return STATUS_NOT_IMPLEMENTED;
 116 }
 117
 118 /*
 119  * @implemented
 120  */
 121 BOOLEAN
 122 NTAPI
 123 MmIsRecursiveIoFault(VOID)
 124 {
 125     PETHREAD Thread = PsGetCurrentThread();
 126
 127     //
 128     // If any of these is true, this is a recursive fault
 129     //
 130     return ((Thread->DisablePageFaultClustering) | (Thread->ForwardClusterOnly));
 131 }
 132
 133 /*
 134  * @implemented
 135  */
 136 BOOLEAN
 137 NTAPI
 138 MmIsThisAnNtAsSystem(VOID)
 139 {
 140     //
 141     // Return if this is a server system
 142     //
 143     return IsThisAnNtAsSystem;
 144 }
 145
 146 /*
 147  * @implemented
 148  */
 149 MM_SYSTEMSIZE
 150 NTAPI
 151 MmQuerySystemSize(VOID)
 152 {
 153     //
 154     // Return the low, medium or high memory system type
 155     //
 156     return MmSystemSize;
 157 }
 158
 159 /* EOF */