Changeset c427578 in mainline for kernel/arch/ia32/src/boot/vesa_real.inc

Timestamp:

2011-07-04T15:26:45Z (13 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

9e34750

Parents:

10293970

Message:

Request VBE 3.0 information from the BIOS.

Fixes setting non-standard video modes on real hardware
which hides those modes probably due to compatibility
reasons with older software.

File:

• kernel/arch/ia32/src/boot/vesa_real.inc (modified) (1 diff)

kernel/arch/ia32/src/boot/vesa_real.inc

@@ -154 +154 @@
         mov $e_vesa_init - vesa_init, %di
         push %di
+        /* Write "VBE2" signature to info structure in order to get
+         * proper mode information. The presence of "VBE2" indicates two
+         * things:
+         *  - VBE controller information structure is 512 bytes long
+         *    instead of 256
+         *  - The BIOS reports VBE 3.0 information (including non-standard
+         *    modes in mode list)
+         */
+        movl $0x32454256, (%di)
         int $0x10