2009-11-09 Vladimir Serbinenko <phcoder@gmail.com>

	* kern/i386/pc/startup.S (grub_biosdisk_get_diskinfo_int13_extensions):
	Ignore return status if CF is cleared.

diff --git a/kern/i386/pc/startup.S b/kern/i386/pc/startup.S
index da3624c894d5afabd9c0da21d816dbd73f416887..83f0b4ef8bc3890bc5b038a149fa10be6d6e41a9 100644 (file)
--- a/kern/i386/pc/startup.S
+++ b/kern/i386/pc/startup.S
@@ -776,6 +776,11 @@ FUNCTION(grub_biosdisk_get_diskinfo_int13_extensions)
        movw    %cx, %ax
        movw    %bx, %ds
        int     $0x13           /* do the operation */
+       jc      noclean
+       /* Clean return value if carry isn't set to workaround
+       some buggy BIOSes.  */
+       xor     %ax, %ax
+noclean:
        movb    %ah, %bl        /* save return value in %bl */
        /* back to protected mode */
        DATA32  call    real_to_prot