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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
commit5f2679055d5f58db9548efe5545fac256d1c7d4d (patch)
tree13e09065ce1750ea593a5185c299ae9688b05b68 /arch/i386
parent88fa0a6eb906b532cd073b6e3d8f688c47404709 (diff)
downloadu-boot-linaro-stable-5f2679055d5f58db9548efe5545fac256d1c7d4d.tar.gz
x86: Don't clobber %ebx
%ebx will hold low-level boot flags and must be preserved
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/cpu/sc520/sc520_asm.S15
-rw-r--r--arch/i386/cpu/start.S4
2 files changed, 12 insertions, 7 deletions
diff --git a/arch/i386/cpu/sc520/sc520_asm.S b/arch/i386/cpu/sc520/sc520_asm.S
index a18e2c3d0..63c14b7eb 100644
--- a/arch/i386/cpu/sc520/sc520_asm.S
+++ b/arch/i386/cpu/sc520/sc520_asm.S
@@ -174,6 +174,9 @@
.globl mem_init
mem_init:
+ /* Preserve Boot Flags */
+ movl %ebx, %ebp
+
/* initialize dram controller registers */
xorw %ax, %ax
movl $DBCTL, %edi
@@ -517,6 +520,8 @@ bad_ram:
jmp bad_reint
dram_done:
+ /* Restore Boot Flags */
+ movl %ebx, %ebp
jmp mem_init_ret
#if CONFIG_SYS_SDRAM_ECC_ENABLE
@@ -579,7 +584,7 @@ bank0: movl (%edi), %eax
jz bank1
andl $0x0000007f, %eax
shll $22, %eax
- movl %eax, %ebx
+ movl %eax, %edx
bank1: movl (%edi), %eax
movl %eax, %ecx
@@ -587,7 +592,7 @@ bank1: movl (%edi), %eax
jz bank2
andl $0x00007f00, %eax
shll $14, %eax
- movl %eax, %ebx
+ movl %eax, %edx
bank2: movl (%edi), %eax
movl %eax, %ecx
@@ -595,7 +600,7 @@ bank2: movl (%edi), %eax
jz bank3
andl $0x007f0000, %eax
shll $6, %eax
- movl %eax, %ebx
+ movl %eax, %edx
bank3: movl (%edi), %eax
movl %eax, %ecx
@@ -603,8 +608,8 @@ bank3: movl (%edi), %eax
jz done
andl $0x7f000000, %eax
shrl $2, %eax
- movl %eax, %ebx
+ movl %eax, %edx
done:
- movl %ebx, %eax
+ movl %edx, %eax
jmp get_mem_size_ret
diff --git a/arch/i386/cpu/start.S b/arch/i386/cpu/start.S
index 551965f42..63f733421 100644
--- a/arch/i386/cpu/start.S
+++ b/arch/i386/cpu/start.S
@@ -118,8 +118,8 @@ mem_ok:
cmpl $0, %eax
jne die
push $0x55aa55aa
- popl %ebx
- cmpl $0x55aa55aa, %ebx
+ popl %ecx
+ cmpl $0x55aa55aa, %ecx
jne die
wbinvd