Changeset 67785 in vbox for trunk/src/VBox/Devices/PC/BIOS/keyboard.c

Timestamp:

Jul 5, 2017 8:46:04 AM (8 years ago)

Author:

vboxsync

Message:

BIOS: Preserve most flags on INT 16h/01h, 11h. Some software depends on enabling interrupts and/or preserving TF, DF.

File:

• trunk/src/VBox/Devices/PC/BIOS/keyboard.c (modified) (3 diffs)

trunk/src/VBox/Devices/PC/BIOS/keyboard.c

@@ -645 +645 @@
 #define SP      r.gr.u.r16.sp
 #define FLAGS   r.ra.flags.u.r16.flags
+#define IFLGS   r.ifl
 
 /* Interrupt 16h service implementation. */
@@ -686 +687 @@
 
     case 0x01: /* check keyboard status */
-        SET_IF();   /* Enable interrupts. Some callers depend on that! */
+        /* Enable interrupts, preserve most flags. Some callers depend on that! */
+        FLAGS = IFLGS;
         if ( !dequeue_key(&scan_code, &ascii_code, 0) ) {
             SET_ZF();
@@ -763 +765 @@
 
     case 0x11: /* check MF-II keyboard status */
-        SET_IF();
+        /* Enable interrupts, preserve most flags. Some callers depend on that! */
+        FLAGS = IFLGS;
         if ( !dequeue_key(&scan_code, &ascii_code, 0) ) {
             SET_ZF();