diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-12-04 10:37:47 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2020-12-21 11:19:20 +0000 |
| commit | 0557ac83fd1a0a7cd6909665bad50006507115a0 (patch) | |
| tree | 70093cdb8d9e72d3a05d0e5d1afa528bd334faa6 /arch/arm | |
| parent | 27bde183b0d3b0e8e84c80db1864a5c7bd20b5e7 (diff) | |
ARM: 9035/1: uncompress: Add be32tocpu macro
DTB stores all values as 32-bit big-endian integers.
Add a macro to convert such values to native CPU endianness, to reduce
duplication.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 2e04ec5b5446..14d1995106c2 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -165,6 +165,16 @@ orr \res, \res, \tmp1, lsl #24 .endm + .macro be32tocpu, val, tmp +#ifndef __ARMEB__ + /* convert to little endian */ + eor \tmp, \val, \val, ror #16 + bic \tmp, \tmp, #0x00ff0000 + mov \val, \val, ror #8 + eor \val, \val, \tmp, lsr #8 +#endif + .endm + .section ".start", "ax" /* * sort out different calling conventions @@ -345,13 +355,7 @@ restart: adr r0, LC1 /* Get the initial DTB size */ ldr r5, [r6, #4] -#ifndef __ARMEB__ - /* convert to little endian */ - eor r1, r5, r5, ror #16 - bic r1, r1, #0x00ff0000 - mov r5, r5, ror #8 - eor r5, r5, r1, lsr #8 -#endif + be32tocpu r5, r1 dbgadtb r6, r5 /* 50% DTB growth should be good enough */ add r5, r5, r5, lsr #1 @@ -403,13 +407,7 @@ restart: adr r0, LC1 /* Get the current DTB size */ ldr r5, [r6, #4] -#ifndef __ARMEB__ - /* convert r5 (dtb size) to little endian */ - eor r1, r5, r5, ror #16 - bic r1, r1, #0x00ff0000 - mov r5, r5, ror #8 - eor r5, r5, r1, lsr #8 -#endif + be32tocpu r5, r1 /* preserve 64-bit alignment */ add r5, r5, #7 |