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authorGraeme Russ <graeme.russ@gmail.com>2010-10-07 20:03:28 +1100
committerGraeme Russ <graeme.russ@gmail.com>2010-10-07 20:03:28 +1100
commit5a3876d2ac0aaaf16d50ce91b03c2030822da66f (patch)
tree9985fd87c08b61820fa80b301caaf40d94708c85 /arch/i386/cpu
parent5f2679055d5f58db9548efe5545fac256d1c7d4d (diff)
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x86: Dont clobber %eax after getting memory size
By using another register, reduce code size by one instruction
Diffstat (limited to 'arch/i386/cpu')
-rw-r--r--arch/i386/cpu/start.S5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/i386/cpu/start.S b/arch/i386/cpu/start.S
index 63f7334..66ff4f3 100644
--- a/arch/i386/cpu/start.S
+++ b/arch/i386/cpu/start.S
@@ -114,8 +114,8 @@ mem_ok:
/* Test the stack */
pushl $0
- popl %eax
- cmpl $0, %eax
+ popl %ecx
+ cmpl $0, %ecx
jne die
push $0x55aa55aa
popl %ecx
@@ -125,7 +125,6 @@ mem_ok:
wbinvd
/* Set the upper memory limit parameter */
- movl %esp, %eax
subl $CONFIG_SYS_STACK_SIZE, %eax
call board_init_f /* Enter, U-boot! */