[hbelusca] 64360: [NTVDM]: Fix a bug introduced in revision 64324, where I didn't restore the original values of CF and AX. Fix some keyboard issues in Mystery Mansion.

Author: hbelusca
Date: Sat Sep 27 23:45:24 2014
New Revision: 64360

URL: http://svn.reactos.org/svn/reactos?rev=64360&view=rev
Log:
[NTVDM]: Fix a bug introduced in revision 64324, where I didn't restore the original values of CF and AX. Fix some keyboard issues in Mystery Mansion.

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

Modified: trunk/reactos/subsystems/ntvdm/bios/bios32/kbdbios32.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/ntvdm/bios/bios3...
==============================================================================
--- trunk/reactos/subsystems/ntvdm/bios/bios32/kbdbios32.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/ntvdm/bios/bios32/kbdbios32.c	[iso-8859-1] Sat Sep 27 23:45:24 2014
@@ -194,6 +194,7 @@
 // Keyboard IRQ 1
 static VOID WINAPI BiosKeyboardIrq(LPWORD Stack)
 {
+    BOOLEAN SkipScanCode;
     BYTE ScanCode, VirtualKey;
     WORD Character;

@@ -204,17 +205,24 @@
      * In return, if CF is set we continue processing the scan code
      * stored in AL, and if not, we skip it.
      */
+    BYTE CF, AX;
+    CF = getCF();
+    AX = getAX();
+
     setCF(1);
     setAL(IOReadB(PS2_DATA_PORT));
     setAH(0x4F);
     Int32Call(&BiosContext, BIOS_MISC_INTERRUPT);

-    /* Check whether CL is clear. If so, skip the scan code. */
-    if (getCF() == 0) goto Quit;
-    /**/setCF(0);/**/ // FIXME: HACK: Reset CF otherwise we enter in an infinite loop.
-
     /* Retrieve the modified scan code in AL */
+    SkipScanCode = (getCF() == 0);
     ScanCode = getAL();
+
+    setAX(AX);
+    setCF(CF);
+
+    /* Check whether CF is clear. If so, skip the scan code. */
+    if (SkipScanCode) goto Quit;

/* Get the corresponding virtual key code */
     VirtualKey = MapVirtualKey(ScanCode & 0x7F, MAPVK_VSC_TO_VK);