[PATCH v10 1/3] ARM: uncompress: Add be32tocpu macro
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: 2020-12-03 12:20:33
Also in:
linux-renesas-soc, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
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> --- v10: - New. --- arch/arm/boot/compressed/head.S | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 835ce64f1674c9a2..aabdc544c03aafdc 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
--
2.25.1
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