Changeset 85497 in vbox for trunk

Timestamp:

Jul 29, 2020 7:31:35 AM (4 years ago)

Author:

vboxsync

Message:

VGABIOS: If LFB is disabled (BAR is zero), do not report any LFB modes.

File:

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

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

@@ -214 +214 @@
     }
 
+    /* The LFB may be disabled. If so, LFB modes must not be reported. */
+    if (using_lfb) {
+        uint16_t    lfb_addr_hi;
+
+        out_w(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_FB_BASE_HI);
+        lfb_addr_hi = in_w(VBE_DISPI_IOPORT_DATA);
+        if (!lfb_addr_hi) {
+#ifdef DEBUG_VGA
+            printf("LFB disabled, LFB modes unavailable!\n");
+#endif
+            return 0;
+        }
+    }
+
     cur_info_ofs = sizeof(VBEHeader);