Changeset 75149 in vbox for trunk/src/VBox/Devices/PC

Timestamp:

Oct 29, 2018 2:14:22 PM (6 years ago)

Author:

vboxsync

Message:

BIOS: Added custom video mode set function not limited by the list of available VBE modes (bugref:9273).

File:

• trunk/src/VBox/Devices/PC/BIOS/logo.c (modified) (2 diffs)

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

@@ -61 +61 @@
     parm [es di] modify [ax bx] nomemory;
 
+
+/**
+ * Set custom video mode.
+ * @param   xres    Requested width
+ * @param   yres    Requested height
+ * @param   bpp     Requested bits per pixel
+ */
+uint16_t custom_set_mode(uint16_t xres, uint16_t yres, uint8_t bpp);
+#pragma aux custom_set_mode = \
+    "mov    ax, 5642h"      \
+    "mov    bl, 0"          \
+    "int    10h"            \
+    parm [cx] [dx] [bh] modify [ax] nomemory;
 
 /**
@@ -369 +382 @@
         goto done;
 
-    // Set video mode #0x142 640x480x32bpp
-    vesa_set_mode(0x142);
+    /* Set video mode using private video BIOS interface. */
+    tmp = custom_set_mode(640*2, 480*2, 32);
+    /* If custom mode set failed, fall back to VBE. */
+    if (tmp != 0x4F)
+        vesa_set_mode(0x142);
 
     if (is_fade_in)