From: Masahiro Yamada <masahiroy@kernel.org>
Date: Tue, 3 Dec 2019 05:28:58 +0000 (+0900)
Subject: x86: simplify ljmp to 32-bit code
X-Git-Url: http://git.dujemihanovic.xyz/img/static/git-logo.png?a=commitdiff_plain;h=90ab311a7c1ee91201c23726871d20b2287a51a5;p=u-boot.git

x86: simplify ljmp to 32-bit code

You can directly specify the label as the operand for ljmp.

This commit saves 4-byte code.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: fixed the gas warning]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
---

diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S
index bcabd76741..54f4ff6662 100644
--- a/arch/x86/cpu/start16.S
+++ b/arch/x86/cpu/start16.S
@@ -44,10 +44,8 @@ data32 cs	lgdt	gdt_ptr
 ff:
 
 	/* Finally restore BIST and jump to the 32-bit initialization code */
-	movw	$code32start, %ax
-	movw	%ax, %bp
 	movl	%ecx, %eax
-data32 cs	ljmp	*(%bp)
+data32 cs	ljmp	*code32start
 
 	/* 48-bit far pointer */
 code32start: