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authorMichal Simek <monstr@monstr.eu>2011-01-31 14:57:26 +0100
committerMichal Simek <monstr@monstr.eu>2011-03-09 08:09:53 +0100
commit495162dfefe3f6e3a8e908aa2f0a964a572d3e87 (patch)
treead617d05d68d674bccf7820c1d2def4433e82693
parent601149775158ea825326734c2db5d90190249bd7 (diff)
microblaze: Optimize BE/LE bootup detecting
Save 0x1 word to rodata section and remove online value loading if DTB is passed from bootloader. It saves two asm instructions in bootup. Signed-off-by: Michal Simek <monstr@monstr.eu>
-rw-r--r--arch/microblaze/kernel/head.S12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S
index 778a5ce2e4fc..d8dc085a9456 100644
--- a/arch/microblaze/kernel/head.S
+++ b/arch/microblaze/kernel/head.S
@@ -39,7 +39,7 @@
#include <asm/mmu.h>
#include <asm/processor.h>
-.data
+.section .data
.global empty_zero_page
.align 12
empty_zero_page:
@@ -50,6 +50,11 @@ swapper_pg_dir:
#endif /* CONFIG_MMU */
+.section .rodata
+.align 4
+endian_check:
+ .word 1
+
__HEAD
ENTRY(_start)
#if CONFIG_KERNEL_BASE_ADDR == 0
@@ -79,10 +84,7 @@ real_start:
/* Does r7 point to a valid FDT? Load HEADER magic number */
/* Run time Big/Little endian platform */
/* Save 1 as word and load byte - 0 - BIG, 1 - LITTLE */
- addik r11, r0, 0x1 /* BIG/LITTLE checking value */
- /* __bss_start will be zeroed later - it is just temp location */
- swi r11, r0, TOPHYS(__bss_start)
- lbui r11, r0, TOPHYS(__bss_start)
+ lbui r11, r0, TOPHYS(endian_check)
beqid r11, big_endian /* DO NOT break delay stop dependency */
lw r11, r0, r7 /* Big endian load in delay slot */
lwr r11, r0, r7 /* Little endian load */