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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>
This commit is contained in:
Michal Simek 2011-01-31 14:57:26 +01:00
parent 6011497751
commit 495162dfef
1 changed files with 7 additions and 5 deletions
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12
arch/microblaze/kernel/head.S
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@ -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 */