[aandrejevic] 69297: [NTVDM] Save and restore the general purpose and segment registers around Int32Call calls in the BIOS. Also, make sure CF doesn't get set by the called interrupt procedure.

Author: aandrejevic
Date: Sat Sep 19 22:12:56 2015
New Revision: 69297

URL: http://svn.reactos.org/svn/reactos?rev=69297&view=rev
Log:
[NTVDM]
Save and restore the general purpose and segment registers around Int32Call
calls in the BIOS. Also, make sure CF doesn't get set by the called interrupt
procedure.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/bios32.c
    trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c

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] Sat Sep 19 22:12:56 2015
@@ -721,7 +721,30 @@
      * because some programs may hook only BIOS_SYS_TIMER_INTERRUPT
      * for their purpose...
      */
+
+    WORD AX = getAX();
+    WORD CX = getCX();
+    WORD DX = getDX();
+    WORD BX = getBX();
+    WORD BP = getBP();
+    WORD SI = getSI();
+    WORD DI = getDI();
+    WORD DS = getDS();
+    WORD ES = getES();
+
     Int32Call(&BiosContext, BIOS_SYS_TIMER_INTERRUPT);
+
+    setAX(AX);
+    setCX(CX);
+    setDX(DX);
+    setBX(BX);
+    setBP(BP);
+    setSI(SI);
+    setDI(DI);
+    setDS(DS);
+    setES(ES);
+    setCF(0);
+
     // BiosSystemTimerInterrupt(Stack);
     PicIRQComplete(LOBYTE(Stack[STACK_INT_NUM]));
 }

Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios/...
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c	[iso-8859-1] Sat Sep 19 22:12:56 2015
@@ -209,8 +209,15 @@
      * In return, if CF is set we continue processing the scan code
      * stored in AL, and if not, we skip it.
      */
-    BYTE CF = getCF();
     WORD AX = getAX();
+    WORD CX = getCX();
+    WORD DX = getDX();
+    WORD BX = getBX();
+    WORD BP = getBP();
+    WORD SI = getSI();
+    WORD DI = getDI();
+    WORD DS = getDS();
+    WORD ES = getES();

setCF(1);
     setAL(IOReadB(PS2_DATA_PORT));
@@ -222,7 +229,15 @@
     ScanCode = getAL();

setAX(AX);
-    setCF(CF);
+    setCX(CX);
+    setDX(DX);
+    setBX(BX);
+    setBP(BP);
+    setSI(SI);
+    setDI(DI);
+    setDS(DS);
+    setES(ES);
+    setCF(0);

if (ScanCode == 0xE0)
     {