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authorYalin Wang <Yalin.Wang@sonymobile.com>2015-01-16 02:45:55 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-01-16 14:06:18 +0000
commit0b7857dbeb256d1a9c0c606ec4b5f417e159040b (patch)
tree00d423118f36a70a1439582d316e42c1dd0bef68 /arch/arm/include
parent8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c (diff)
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>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/bitrev.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/include/asm/bitrev.h b/arch/arm/include/asm/bitrev.h
new file mode 100644
index 000000000000..ec291c350ea3
--- /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