From: Julian Pidancet <julian.pidancet@gmail.com>
Date: Mon, 5 Mar 2012 14:20:45 +0000 (+0000)
Subject: vgabios: Fetch _rom_header_size from the global segment when computing the ROM's... 
X-Git-Tag: rel-1.7.0~36
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=a23a95141631af7d24ac2fdbcb5dfbf27ad6dbb0;p=seabios.git

vgabios: Fetch _rom_header_size from the global segment when computing the ROM's checksum

Otherwise, checksum_far is getting called with zero as the length
parameter, and the ROM checksum in the header end up beeing zero
after vga_post() is called.

Signed-off-by: Julian Pidancet <julian.pidancet@gmail.com>
---

diff --git a/vgasrc/vgabios.c b/vgasrc/vgabios.c
index faf57b1..d80cd53 100644
--- a/vgasrc/vgabios.c
+++ b/vgasrc/vgabios.c
@@ -1260,6 +1260,7 @@ vga_post(struct bregs *regs)
     // Fixup checksum
     extern u8 _rom_header_size, _rom_header_checksum;
     SET_VGA(_rom_header_checksum, 0);
-    u8 sum = -checksum_far(get_global_seg(), 0, _rom_header_size * 512);
+    u8 sum = -checksum_far(get_global_seg(), 0,
+                           GET_GLOBAL(_rom_header_size) * 512);
     SET_VGA(_rom_header_checksum, sum);
 }