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Commit 495162df authored by Michal Simek's avatar Michal Simek
Browse files

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: default avatarMichal Simek <monstr@monstr.eu>
parent 60114977

arch/microblaze/kernel/head.S

+7 −5
Original line number Diff line number Diff line
@@ -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 */