[hbelusca] 68600: [NTVDM] - Increase the maximum number of EMS handles to the maximum permitted by the specification (ie. 255 handles) - Zero out EMS handles names. - EMS status are always returned...
5 Aug
2015
5 Aug
'15
3:12 p.m.
Author: hbelusca
Date: Wed Aug 5 15:12:46 2015
New Revision: 68600
URL: http://svn.reactos.org/svn/reactos?rev=68600&view=rev
Log:
[NTVDM]
- Increase the maximum number of EMS handles to the maximum permitted by the specification
(ie. 255 handles)
- Zero out EMS handles names.
- EMS status are always returned in the AH register!
- Implement functions 4Bh "Get Number of Opened Handles" and 4Ch "Get
Handle Number of Pages"
- Remove an hardcoded value.
- Cosmetic change: rename EMS_STATUS_OK to EMS_STATUS_SUCCESS to comply with the name
convention used also in XMS, etc...
Modified:
trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c
trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h
Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c [iso-8859-1] Wed Aug 5
15:12:46 2015
@@ -4,6 +4,9 @@
* FILE: emsdrv.c
* PURPOSE: DOS EMS Driver
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
+ *
+ * DOCUMENTATION: Official specification:
+ * LIM EMS v4.0: http://www.phatcode.net/res/218/files/limems40.txt
*/
/* INCLUDES *******************************************************************/
@@ -48,6 +51,7 @@
{
HandleTable[i].Allocated = FALSE;
HandleTable[i].PageCount = 0;
+ RtlZeroMemory(HandleTable[i].Name, sizeof(HandleTable[i].Name));
InitializeListHead(&HandleTable[i].PageList);
}
}
@@ -77,6 +81,8 @@
{
HandleEntry->Allocated = FALSE;
HandleEntry->PageCount = 0;
+ RtlZeroMemory(HandleEntry->Name, sizeof(HandleEntry->Name));
+ // InitializeListHead(HandleEntry->PageList);
}
static inline PEMS_HANDLE GetHandleRecord(USHORT Handle)
@@ -110,10 +116,9 @@
}
InitializeListHead(&HandleEntry->PageList);
-
FreeHandle(HandleEntry);
- return EMS_STATUS_OK;
+ return EMS_STATUS_SUCCESS;
}
static UCHAR EmsAlloc(USHORT NumPages, PUSHORT Handle)
@@ -154,7 +159,7 @@
}
}
- return EMS_STATUS_OK;
+ return EMS_STATUS_SUCCESS;
}
static PEMS_PAGE GetLogicalPage(PEMS_HANDLE HandleEntry, USHORT LogicalPage)
@@ -186,7 +191,7 @@
{
/* Unmap */
Mapping[PhysicalPage] = NULL;
- return EMS_STATUS_OK;
+ return EMS_STATUS_SUCCESS;
}
PageEntry = GetLogicalPage(HandleEntry, LogicalPage);
@@ -194,7 +199,7 @@
Mapping[PhysicalPage] = (PVOID)((ULONG_PTR)EmsMemory
+ ARRAY_INDEX(PageEntry, PageTable) * EMS_PAGE_SIZE);
- return EMS_STATUS_OK;
+ return EMS_STATUS_SUCCESS;
}
static VOID WINAPI EmsIntHandler(LPWORD Stack)
@@ -204,22 +209,22 @@
/* Get Manager Status */
case 0x40:
{
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
break;
}
/* Get Page Frame Segment */
case 0x41:
{
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
setBX(EmsSegment);
break;
}
- /* Get Number of Pages */
+ /* Get Number of Unallocated Pages */
case 0x42:
{
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
setBX(RtlNumberOfClearBits(&AllocBitmap));
setDX(EmsTotalPages);
break;
@@ -232,7 +237,7 @@
UCHAR Status = EmsAlloc(getBX(), &Handle);
setAH(Status);
- if (Status == EMS_STATUS_OK) setDX(Handle);
+ if (Status == EMS_STATUS_SUCCESS) setDX(Handle);
break;
}
@@ -253,7 +258,7 @@
/* Get EMM Version */
case 0x46:
{
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
setAL(EMS_VERSION_NUM);
break;
}
@@ -272,6 +277,39 @@
break;
}
+ /* Get Number of Opened Handles */
+ case 0x4B:
+ {
+ USHORT NumOpenHandles = 0;
+ ULONG i;
+
+ for (i = 0; i < EMS_MAX_HANDLES; i++)
+ {
+ if (HandleTable[i].Allocated)
+ ++NumOpenHandles;
+ }
+
+ setAH(EMS_STATUS_SUCCESS);
+ setBX(NumOpenHandles);
+ break;
+ }
+
+ /* Get Handle Number of Pages */
+ case 0x4C:
+ {
+ PEMS_HANDLE HandleEntry = GetHandleRecord(getDX());
+
+ if (!ValidateHandle(HandleEntry))
+ {
+ setAH(EMS_STATUS_INVALID_HANDLE);
+ break;
+ }
+
+ setAH(EMS_STATUS_SUCCESS);
+ setBX(HandleEntry->PageCount);
+ break;
+ }
+
/* Get/Set Handle Name */
case 0x53:
{
@@ -279,7 +317,7 @@
if (!ValidateHandle(HandleEntry))
{
- setAL(EMS_STATUS_INVALID_HANDLE);
+ setAH(EMS_STATUS_INVALID_HANDLE);
break;
}
@@ -289,7 +327,7 @@
RtlCopyMemory(SEG_OFF_TO_PTR(getES(), getDI()),
HandleEntry->Name,
sizeof(HandleEntry->Name));
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
}
else if (getAL() == 0x01)
{
@@ -297,7 +335,7 @@
RtlCopyMemory(HandleEntry->Name,
SEG_OFF_TO_PTR(getDS(), getSI()),
sizeof(HandleEntry->Name));
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
}
else
{
@@ -321,18 +359,16 @@
{
/* Expanded memory */
HandleEntry = GetHandleRecord(Data->SourceHandle);
-
if (!ValidateHandle(HandleEntry))
{
- setAL(EMS_STATUS_INVALID_HANDLE);
+ setAH(EMS_STATUS_INVALID_HANDLE);
break;
}
PageEntry = GetLogicalPage(HandleEntry, Data->SourceSegment);
-
if (!PageEntry)
{
- setAL(EMS_STATUS_INV_LOGICAL_PAGE);
+ setAH(EMS_STATUS_INV_LOGICAL_PAGE);
break;
}
@@ -350,18 +386,16 @@
{
/* Expanded memory */
HandleEntry = GetHandleRecord(Data->DestHandle);
-
if (!ValidateHandle(HandleEntry))
{
- setAL(EMS_STATUS_INVALID_HANDLE);
+ setAH(EMS_STATUS_INVALID_HANDLE);
break;
}
PageEntry = GetLogicalPage(HandleEntry, Data->DestSegment);
-
if (!PageEntry)
{
- setAL(EMS_STATUS_INV_LOGICAL_PAGE);
+ setAH(EMS_STATUS_INV_LOGICAL_PAGE);
break;
}
@@ -393,7 +427,7 @@
RtlMoveMemory(DestPtr, SourcePtr, Data->RegionLength);
}
- setAL(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
break;
}
@@ -408,17 +442,17 @@
for (i = 0; i < EMS_PHYSICAL_PAGES; i++)
{
*(PWORD)SEG_OFF_TO_PTR(getES(), Offset++) =
- EMS_SEGMENT + i * (EMS_PAGE_SIZE >> 4);
+ EMS_SEGMENT + i * (EMS_PAGE_SIZE >> 4);
*(PWORD)SEG_OFF_TO_PTR(getES(), Offset++) = i;
}
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
setCX(EMS_PHYSICAL_PAGES);
}
else if (getAL() == 0x01)
{
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
setCX(EMS_PHYSICAL_PAGES);
}
else
@@ -444,12 +478,12 @@
HardwareInfo->DmaRegisterSets = 0;
HardwareInfo->DmaChannelOperation = 0;
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
}
else if (getAL() == 0x01)
{
/* Same as function AH = 42h */
- setAH(EMS_STATUS_OK);
+ setAH(EMS_STATUS_SUCCESS);
setBX(RtlNumberOfClearBits(&AllocBitmap));
setDX(EmsTotalPages);
}
@@ -517,7 +551,6 @@
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
-
return DOS_DEVSTAT_DONE;
}
@@ -531,8 +564,6 @@
EmsSegment = (Segment != 0 ? Segment : EMS_SEGMENT);
Size = EMS_SEGMENT_SIZE; // Size in paragraphs
if (!UmaDescReserve(&EmsSegment, &Size)) return FALSE;
-
- InitHandlesTable();
EmsTotalPages = TotalPages;
BitmapBuffer = RtlAllocateHeap(RtlGetProcessHeap(),
@@ -575,16 +606,18 @@
EmsReadMemory,
EmsWriteMemory);
+ // FIXME: The EMS driver MUST automatically initialize handle 0x0000
+ // (operating system handle) as per the specification says!
+ InitHandlesTable();
+
/* Create the device */
Node = DosCreateDeviceEx(DOS_DEVATTR_IOCTL | DOS_DEVATTR_CHARACTER,
EMS_DEVICE_NAME,
- 32);
+ Int16To32StubSize);
Node->IoctlReadRoutine = EmsDrvDispatchIoctlRead;
- RegisterInt32(MAKELONG(sizeof(DOS_DRIVER) + DEVICE_CODE_SIZE,
HIWORD(Node->Driver)),
- EMS_INTERRUPT_NUM,
- EmsIntHandler,
- NULL);
+ RegisterInt32(DEVICE_PRIVATE_AREA(Node->Driver),
+ EMS_INTERRUPT_NUM, EmsIntHandler, NULL);
return TRUE;
}
Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h [iso-8859-1] Wed Aug 5
15:12:46 2015
@@ -14,7 +14,8 @@
#define EMS_VERSION_NUM 0x40
#define EMS_INTERRUPT_NUM 0x67
#define EMS_SEGMENT 0xD000 // Default segment
-#define EMS_MAX_HANDLES 16
+// Specification: Operating system handle 0x0000; user handles from 0x0001 to 0x00FE
+#define EMS_MAX_HANDLES 255
#define EMS_PAGE_BITS 14
#define EMS_PAGE_SIZE (1 << EMS_PAGE_BITS)
#define EMS_PHYSICAL_PAGES 4
@@ -22,7 +23,7 @@
/* 16 MB of EMS memory */
#define EMS_TOTAL_PAGES 1024
-#define EMS_STATUS_OK 0x00
+#define EMS_STATUS_SUCCESS 0x00
#define EMS_STATUS_INTERNAL_ERROR 0x80
#define EMS_STATUS_INVALID_HANDLE 0x83
#define EMS_STATUS_NO_MORE_HANDLES 0x85
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