[aandrejevic] 67325: [NTVDM] Make the total amount of EMS pages configurable. Allocate memory for EMS instead of sharing a part of the guest memory.
20 Apr
2015
20 Apr
'15
2:02 p.m.
Author: aandrejevic
Date: Mon Apr 20 14:02:18 2015
New Revision: 67325
URL: http://svn.reactos.org/svn/reactos?rev=67325&view=rev
Log:
[NTVDM]
Make the total amount of EMS pages configurable.
Allocate memory for EMS instead of sharing a part of the guest memory.
Modified:
trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.h
trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.c
trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.h
Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c [iso-8859-1] Mon Apr 20
14:02:18 2015
@@ -666,7 +666,11 @@
SearchAndInitRoms(&BiosContext);
/* Initialize EMS */
- EmsInitialize();
+ if (!EmsInitialize(EMS_TOTAL_PAGES))
+ {
+ DPRINT1("Could not initialize EMS. EMS will not be available.\n"
+ "Try reducing the number of EMS pages.\n");
+ }
/*
* End of the 32-bit POST portion. We then fall back into 16-bit where
Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.h [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.h [iso-8859-1] Mon Apr 20
14:02:18 2015
@@ -21,6 +21,9 @@
// #define BIOS_TIME_INTERRUPT 0x1A
// #define BIOS_SYS_TIMER_INTERRUPT 0x1C
+/* 16 MB of EMS memory */
+#define EMS_TOTAL_PAGES 1024
+
/* FUNCTIONS ******************************************************************/
BOOLEAN Bios32Initialize(VOID);
Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.c [iso-8859-1] Mon Apr 20 14:02:18
2015
@@ -19,10 +19,12 @@
/* PRIVATE VARIABLES **********************************************************/
static RTL_BITMAP AllocBitmap;
-static ULONG BitmapBuffer[(EMS_TOTAL_PAGES + sizeof(ULONG) - 1) / sizeof(ULONG)];
-static EMS_PAGE PageTable[EMS_TOTAL_PAGES];
+static PULONG BitmapBuffer = NULL;
+static PEMS_PAGE PageTable = NULL;
static EMS_HANDLE HandleTable[EMS_MAX_HANDLES];
static PVOID Mapping[EMS_PHYSICAL_PAGES] = { NULL };
+static ULONG EmsTotalPages = 0;
+static PVOID EmsMemory = NULL;
/* PRIVATE FUNCTIONS **********************************************************/
@@ -137,7 +139,8 @@
PageEntry = GetLogicalPage(HandleEntry, LogicalPage);
if (!PageEntry) return EMS_STATUS_INV_LOGICAL_PAGE;
- Mapping[PhysicalPage] = (PVOID)(EMS_ADDRESS + ARRAY_INDEX(PageEntry, PageTable) *
EMS_PAGE_SIZE);
+ Mapping[PhysicalPage] = (PVOID)((ULONG_PTR)EmsMemory
+ + ARRAY_INDEX(PageEntry, PageTable) * EMS_PAGE_SIZE);
return EMS_STATUS_OK;
}
@@ -165,7 +168,7 @@
{
setAH(EMS_STATUS_OK);
setBX(RtlNumberOfClearBits(&AllocBitmap));
- setDX(EMS_TOTAL_PAGES);
+ setDX(EmsTotalPages);
break;
}
@@ -230,10 +233,9 @@
break;
}
- SourcePtr = (PUCHAR)REAL_TO_PHYS(EMS_ADDRESS
- + ARRAY_INDEX(PageEntry, PageTable)
- * EMS_PAGE_SIZE
- + Data->SourceOffset);
+ SourcePtr = (PUCHAR)((ULONG_PTR)EmsMemory
+ + ARRAY_INDEX(PageEntry, PageTable) * EMS_PAGE_SIZE
+ + Data->SourceOffset);
}
else
{
@@ -260,10 +262,9 @@
break;
}
- DestPtr = (PUCHAR)REAL_TO_PHYS(EMS_ADDRESS
- + ARRAY_INDEX(PageEntry, PageTable)
- * EMS_PAGE_SIZE
- + Data->DestOffset);
+ DestPtr = (PUCHAR)((ULONG_PTR)EmsMemory
+ + ARRAY_INDEX(PageEntry, PageTable) * EMS_PAGE_SIZE
+ + Data->DestOffset);
}
else
{
@@ -346,18 +347,45 @@
/* PUBLIC FUNCTIONS ***********************************************************/
-VOID EmsInitialize(VOID)
+BOOLEAN EmsInitialize(ULONG TotalPages)
{
ULONG i;
-
- RtlZeroMemory(BitmapBuffer, sizeof(BitmapBuffer));
- RtlInitializeBitMap(&AllocBitmap, BitmapBuffer, EMS_TOTAL_PAGES);
for (i = 0; i < EMS_MAX_HANDLES; i++)
{
HandleTable[i].Allocated = FALSE;
HandleTable[i].PageCount = 0;
InitializeListHead(&HandleTable[i].PageList);
+ }
+
+ EmsTotalPages = TotalPages;
+ BitmapBuffer = RtlAllocateHeap(RtlGetProcessHeap(),
+ HEAP_ZERO_MEMORY,
+ ((TotalPages + 31) / 32) * sizeof(ULONG));
+ if (BitmapBuffer == NULL) return FALSE;
+
+ RtlInitializeBitMap(&AllocBitmap, BitmapBuffer, TotalPages);
+
+ PageTable = (PEMS_PAGE)RtlAllocateHeap(RtlGetProcessHeap(),
+ HEAP_ZERO_MEMORY,
+ TotalPages * sizeof(EMS_PAGE));
+ if (PageTable == NULL)
+ {
+ RtlFreeHeap(RtlGetProcessHeap(), 0, BitmapBuffer);
+ BitmapBuffer = NULL;
+
+ return FALSE;
+ }
+
+ EmsMemory = (PVOID)RtlAllocateHeap(RtlGetProcessHeap(), 0, TotalPages *
EMS_PAGE_SIZE);
+ if (EmsMemory == NULL)
+ {
+ RtlFreeHeap(RtlGetProcessHeap(), 0, PageTable);
+ PageTable = NULL;
+ RtlFreeHeap(RtlGetProcessHeap(), 0, BitmapBuffer);
+ BitmapBuffer = NULL;
+
+ return FALSE;
}
MemInstallFastMemoryHook((PVOID)TO_LINEAR(EMS_SEGMENT, 0),
@@ -366,10 +394,29 @@
EmsWriteMemory);
RegisterBiosInt32(EMS_INTERRUPT_NUM, EmsIntHandler);
+ return TRUE;
}
VOID EmsCleanup(VOID)
{
MemRemoveFastMemoryHook((PVOID)TO_LINEAR(EMS_SEGMENT, 0),
EMS_PHYSICAL_PAGES * EMS_PAGE_SIZE);
-}
+
+ if (EmsMemory)
+ {
+ RtlFreeHeap(RtlGetProcessHeap(), 0, EmsMemory);
+ EmsMemory = NULL;
+ }
+
+ if (PageTable)
+ {
+ RtlFreeHeap(RtlGetProcessHeap(), 0, PageTable);
+ PageTable = NULL;
+ }
+
+ if (BitmapBuffer)
+ {
+ RtlFreeHeap(RtlGetProcessHeap(), 0, BitmapBuffer);
+ BitmapBuffer = NULL;
+ }
+}
Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.h [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/ems.h [iso-8859-1] Mon Apr 20 14:02:18
2015
@@ -15,10 +15,8 @@
#define EMS_INTERRUPT_NUM 0x67
#define EMS_SEGMENT 0xD000
#define EMS_MAX_HANDLES 16
-#define EMS_TOTAL_PAGES 256
#define EMS_PAGE_BITS 14
#define EMS_PAGE_SIZE (1 << EMS_PAGE_BITS)
-#define EMS_ADDRESS 0xA00000
#define EMS_PHYSICAL_PAGES 4
#define EMS_STATUS_OK 0x00
@@ -63,7 +61,7 @@
/* FUNCTIONS ******************************************************************/
-VOID EmsInitialize(VOID);
+BOOLEAN EmsInitialize(ULONG TotalPages);
VOID EmsCleanup(VOID);
#endif // _EMS_H_
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