reactos/ntoskrnl/mm/ARM3/largepag.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            ntoskrnl/mm/ARM3/largepag.c
   5  * PURPOSE:         ARM Memory Manager Large Page Support
   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::LARGEPAGE"
  16 #define MODULE_INVOLVED_IN_ARM3
  17 #include "../ARM3/miarm.h"
  18
  19 /* GLOBALS ********************************************************************/
  20
  21 LIST_ENTRY MmProcessList;
  22 PMMPTE MiLargePageHyperPte;
  23 ULONG MiLargePageRangeIndex;
  24 MI_LARGE_PAGE_RANGES MiLargePageRanges[64];
  25 WCHAR MmLargePageDriverBuffer[512] = {0};
  26 ULONG MmLargePageDriverBufferLength = -1;
  27 LIST_ENTRY MiLargePageDriverList;
  28 BOOLEAN MiLargePageAllDrivers;
  29
  30 /* FUNCTIONS ******************************************************************/
  31
  32 VOID
  33 NTAPI
  34 MiInitializeLargePageSupport(VOID)
  35 {
  36 #if _MI_PAGING_LEVELS > 2
  37 #error "PAE/x64 Not Implemented"
  38 #else
  39     /* Initialize the large-page hyperspace PTE used for initial mapping */
  40     MiLargePageHyperPte = MiReserveSystemPtes(1, SystemPteSpace);
  41     ASSERT(MiLargePageHyperPte);
  42     MiLargePageHyperPte->u.Long = 0;
  43
  44     /* Initialize the process tracking list, and insert the system process */
  45     InitializeListHead(&MmProcessList);
  46     InsertTailList(&MmProcessList, &PsGetCurrentProcess()->MmProcessLinks);
  47 #endif
  48 }
  49
  50 VOID
  51 NTAPI
  52 MiSyncCachedRanges(VOID)
  53 {
  54     ULONG i;
  55
  56     /* Scan every range */
  57     for (i = 0; i < MiLargePageRangeIndex; i++)
  58     {
  59         DPRINT1("No support for large pages\n");
  60         while (TRUE);
  61     }
  62 }
  63
  64 VOID
  65 NTAPI
  66 MiInitializeDriverLargePageList(VOID)
  67 {
  68     PWCHAR p, pp;
  69
  70     /* Initialize the list */
  71     InitializeListHead(&MiLargePageDriverList);
  72
  73     /* Bail out if there's nothing */
  74     if (MmLargePageDriverBufferLength == 0xFFFFFFFF) return;
  75
  76     /* Loop from start to finish */
  77     p = MmLargePageDriverBuffer;
  78     pp = MmLargePageDriverBuffer + (MmLargePageDriverBufferLength / sizeof(WCHAR));
  79     while (p < pp)
  80     {
  81         /* Skip whitespaces */
  82         if ((*p == L' ') || (*p == L'\n') || (*p == L'\r') || (*p == L'\t'))
  83         {
  84             /* Skip the character */
  85             p++;
  86             continue;
  87         }
  88
  89         /* A star means everything */
  90         if (*p == L'*')
  91         {
  92             /* No need to keep going */
  93             MiLargePageAllDrivers = TRUE;
  94             break;
  95         }
  96
  97         DPRINT1("Large page drivers not supported\n");
  98         ASSERT(FALSE);
  99     }
 100 }
 101
 102 /* EOF */