From 0b7857dbeb256d1a9c0c606ec4b5f417e159040b Mon Sep 17 00:00:00 2001
From: Yalin Wang <Yalin.Wang@sonymobile.com>
Date: Fri, 16 Jan 2015 02:45:55 +0100
Subject: [PATCH] ARM: 8287/1: add bitrev.h file to support rbit instruction
This patch add bitrev.h file to support rbit instruction,
so that we can do bitrev operation by hardware.
Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/bitrev.h | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
create mode 100644 arch/arm/include/asm/bitrev.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 97d07ed60a0b7b..c3a986d4512532 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -29,6 +29,7 @@ config ARM
select HANDLE_DOMAIN_IRQ
select HARDIRQS_SW_RESEND
select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
+ select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
diff --git a/arch/arm/include/asm/bitrev.h b/arch/arm/include/asm/bitrev.h
new file mode 100644
index 00000000000000..ec291c350ea381
--- /dev/null
+++ b/arch/arm/include/asm/bitrev.h
@@ -0,0 +1,20 @@
+#ifndef __ASM_BITREV_H
+#define __ASM_BITREV_H
+
+static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)
+{
+ __asm__ ("rbit %0, %1" : "=r" (x) : "r" (x));
+ return x;
+}
+
+static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x)
+{
+ return __arch_bitrev32((u32)x) >> 16;
+}
+
+static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)
+{
+ return __arch_bitrev32((u32)x) >> 24;
+}
+
+#endif
--
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