Changeset 97622 in vbox for trunk/src/VBox

Timestamp:

Nov 21, 2022 10:36:03 AM (2 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

154668

Message:

VGABIOS: Simplified/fixed font access routines; hopefully no behavioral change.

File:

• trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c (modified) (1 diff)

trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c

@@ -1924 +1924 @@
 static void get_font_access(void)
 {
-    outw(VGAREG_SEQU_ADDRESS, 0x0100);
+    outw(VGAREG_GRDC_ADDRESS, 0x0005);
+    outb(VGAREG_GRDC_ADDRESS, 0x06);
+    outw(VGAREG_GRDC_ADDRESS, (((0x04 | (inb(VGAREG_GRDC_DATA) & 0x01)) << 8) | 0x06));
     outw(VGAREG_SEQU_ADDRESS, 0x0402);
-    outw(VGAREG_SEQU_ADDRESS, 0x0704);
-    outw(VGAREG_SEQU_ADDRESS, 0x0300);
-    outw(VGAREG_GRDC_ADDRESS, 0x0204);
-    outw(VGAREG_GRDC_ADDRESS, 0x0005);
-    outw(VGAREG_GRDC_ADDRESS, 0x0406);
+    outw(VGAREG_SEQU_ADDRESS, 0x0604);
 }
 
 static void release_font_access(void)
 {
-    outw(VGAREG_SEQU_ADDRESS, 0x0100);
+    outw(VGAREG_GRDC_ADDRESS, (((0x0a | ((inb(VGAREG_READ_MISC_OUTPUT) & 0x01) << 2)) << 8) | 0x06));
+    outw(VGAREG_GRDC_ADDRESS, 0x1005);
     outw(VGAREG_SEQU_ADDRESS, 0x0302);
-    outw(VGAREG_SEQU_ADDRESS, 0x0304);
-    outw(VGAREG_SEQU_ADDRESS, 0x0300);
-    outw(VGAREG_GRDC_ADDRESS, (((0x0a | ((inb(VGAREG_READ_MISC_OUTPUT) & 0x01) << 2)) << 8) | 0x06));
-    outw(VGAREG_GRDC_ADDRESS, 0x0004);
-    outw(VGAREG_GRDC_ADDRESS, 0x1005);
+    outw(VGAREG_SEQU_ADDRESS, 0x0204);
 }