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| author | Michal Simek <monstr@monstr.eu> | 2011-01-31 14:57:26 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2011-03-09 08:09:53 +0100 |
| commit | 495162dfefe3f6e3a8e908aa2f0a964a572d3e87 (patch) | |
| tree | ad617d05d68d674bccf7820c1d2def4433e82693 /arch/microblaze | |
| parent | microblaze: Fix unaligned.h for endians (diff) | |
| download | linux-495162dfefe3f6e3a8e908aa2f0a964a572d3e87.tar.xz linux-495162dfefe3f6e3a8e908aa2f0a964a572d3e87.zip | |
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>
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/kernel/head.S | 12 |
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 */ |