[hbelusca] 69323: [NTVDM] - Do not hardcode the number of XMS memory blocks that can map the HMA. It should be function of the MAX_ADDRESS value of our emulator. - Require that MAX_ADDRESS should b...

Author: hbelusca
Date: Wed Sep 23 01:45:18 2015
New Revision: 69323

URL: http://svn.reactos.org/svn/reactos?rev=69323&view=rev
Log:
[NTVDM]
- Do not hardcode the number of XMS memory blocks that can map the HMA. It should be
function of the MAX_ADDRESS value of our emulator.
- Require that MAX_ADDRESS should be greater or equal than 1 MB.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/himem.h
    trunk/reactos/subsystems/mvdm/ntvdm/emulator.h

Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/himem.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/himem.h	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/himem.h	[iso-8859-1] Wed Sep 23
01:45:18 2015
@@ -13,8 +13,8 @@
 /* DEFINITIONS ****************************************************************/
 
 #define XMS_ADDRESS     0x110000        // Just above HMA
-#define XMS_BLOCKS      0x3BC0          // XMS_ADDRESS + (XMS_BLOCKS * XMS_BLOCK_SIZE) ==
16 MB
 #define XMS_BLOCK_SIZE  1024
+#define XMS_BLOCKS      ((MAX_ADDRESS - XMS_ADDRESS) / XMS_BLOCK_SIZE)
 #define XMS_MAX_HANDLES 16              // Specification: min 1, max 128, default 32
 
 #define XMS_STATUS_SUCCESS              0x00

Modified: trunk/reactos/subsystems/mvdm/ntvdm/emulator.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/emul…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/emulator.h	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/emulator.h	[iso-8859-1] Wed Sep 23 01:45:18 2015
@@ -23,6 +23,7 @@
 #define MAX_SEGMENT 0xFFFF
 #define MAX_OFFSET  0xFFFF
 #define MAX_ADDRESS 0x1000000 // 16 MB of RAM; see also:
kernel32/client/vdm.c!BaseGetVdmConfigInfo
+C_ASSERT(0x100000 <= MAX_ADDRESS);  // A minimum of 1 MB is required for PC
emulation.
 
 #define SEG_OFF_TO_PTR(seg, off)    \
     (PVOID)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), (off)))