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>
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@ -39,7 +39,7 @@
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#include <asm/mmu.h>
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#include <asm/processor.h>
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.data
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.section .data
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.global empty_zero_page
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.align 12
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empty_zero_page:
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@ -50,6 +50,11 @@ swapper_pg_dir:
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#endif /* CONFIG_MMU */
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.section .rodata
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.align 4
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endian_check:
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.word 1
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__HEAD
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ENTRY(_start)
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#if CONFIG_KERNEL_BASE_ADDR == 0
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@ -79,10 +84,7 @@ real_start:
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/* Does r7 point to a valid FDT? Load HEADER magic number */
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/* Run time Big/Little endian platform */
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/* Save 1 as word and load byte - 0 - BIG, 1 - LITTLE */
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addik r11, r0, 0x1 /* BIG/LITTLE checking value */
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/* __bss_start will be zeroed later - it is just temp location */
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swi r11, r0, TOPHYS(__bss_start)
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lbui r11, r0, TOPHYS(__bss_start)
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lbui r11, r0, TOPHYS(endian_check)
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beqid r11, big_endian /* DO NOT break delay stop dependency */
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lw r11, r0, r7 /* Big endian load in delay slot */
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lwr r11, r0, r7 /* Little endian load */
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