[syslinux] fwd: [syslinux:syslinux-4.xx] mbr/isohdpfx.S: correct stack for heads/sectors
Geert Stappers
stappers at stappers.nl
Sun Apr 16 14:23:22 PDT 2017
Hi,
FYI syslinux upstream has a bugfix.
Both in the 6.xx branch and the 4.xx branch.
----- Forwarded message from syslinux-bot for Martin Str|mberg <ams op ludd.ltu.se> -----
Date: Sat, 15 Apr 2017 10:27:08 -0700
From: syslinux-bot for Martin Str|mberg <ams op ludd.ltu.se>
To: Syslinux commits mailing list <syslinux-commits op zytor.com>
Cc: ams op ludd.ltu.se
Subject: [syslinux:syslinux-4.xx] mbr/isohdpfx.S: correct stack for heads/sectors; revert
X-Mailer: Syslinux-git-log-daemon
Commit-ID: 45af3d24578783c53781050ef2a233dc84ff5ffd
Gitweb: http://www.syslinux.org/commit/45af3d24578783c53781050ef2a233dc84ff5ffd
Author: Martin Str|mberg <ams op ludd.ltu.se>
AuthorDate: Sun, 26 Mar 2017 07:32:11 -0400
Committer: Gene Cumm <gene.cumm op gmail.com>
CommitDate: Sat, 15 Apr 2017 13:24:38 -0400
mbr/isohdpfx.S: correct stack for heads/sectors; revert
Heads and sectors were pushed in reverse order per isolinux.asm
bb519a95 reversed the order of heads/sectors on the stack
Signed-off-by: Gene Cumm <gene.cumm op gmail.com>
---
mbr/isohdpfx.S | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S
index 17e1efe..f9e9691 100644
--- a/mbr/isohdpfx.S
+++ b/mbr/isohdpfx.S
@@ -175,12 +175,12 @@ next:
/* Get (C)HS geometry */
movb $0x08, %ah
int $0x13
- andw $0x3f, %cx /* Sector count */
popw %bx /* EBIOS flag */
- pushw %cx /* -16: Save sectors on the stack */
movzbw %dh, %ax /* dh = max head */
incw %ax /* From 0-based max to count */
- pushw %ax /* -18: Save heads on the stack */
+ pushw %ax /* -16: Save heads on the stack */
+ andw $0x3f, %cx /* Sector count */
+ pushw %cx /* -18: Save sectors on the stack */
mulw %cx /* Heads*sectors -> sectors per cylinder */
pushw %bx /* -20: EBIOS flag */
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Groeten
Geert Stappers
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