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authorPaul Mundt <lethal@linux-sh.org>2008-08-07 18:01:43 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-09-08 10:35:02 +0900
commitee43a8442bd7a5d611f11958e6f8c8953d26f907 (patch)
treef0ccd147aa44c123079b3d6a92b3719d29d31fcb /arch/sh
parent742fd1bcfb475c702c9b1dd6afc79c08f8dbf7dd (diff)
sh: Provide movli.l/movco.l-based cmpxchg.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/include/asm/cmpxchg-llsc.h71
-rw-r--r--arch/sh/include/asm/system.h2
2 files changed, 73 insertions, 0 deletions
diff --git a/arch/sh/include/asm/cmpxchg-llsc.h b/arch/sh/include/asm/cmpxchg-llsc.h
new file mode 100644
index 00000000000..aee3bf28658
--- /dev/null
+++ b/arch/sh/include/asm/cmpxchg-llsc.h
@@ -0,0 +1,71 @@
+#ifndef __ASM_SH_CMPXCHG_LLSC_H
+#define __ASM_SH_CMPXCHG_LLSC_H
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+ unsigned long retval;
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%1, %0 ! xchg_u32 \n\t"
+ "mov %0, %2 \n\t"
+ "mov %4, %0 \n\t"
+ "movco.l %0, @%1 \n\t"
+ "bf 1b \n\t"
+ "synco \n\t"
+ : "=&z"(tmp), "=r" (m), "=&r" (retval)
+ : "1" (m), "r" (val)
+ : "t", "memory"
+ );
+
+ return retval;
+}
+
+static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
+{
+ unsigned long retval;
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%1, %0 ! xchg_u8 \n\t"
+ "mov %0, %2 \n\t"
+ "mov %4, %0 \n\t"
+ "movco.l %0, @%1 \n\t"
+ "bf 1b \n\t"
+ "synco \n\t"
+ : "=&z"(tmp), "=r" (m), "=&r" (retval)
+ : "1" (m), "r" (val & 0xff)
+ : "t", "memory"
+ );
+
+ return retval;
+}
+
+static inline unsigned long
+__cmpxchg_u32(volatile int *m, unsigned long old, unsigned long new)
+{
+ unsigned long retval;
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%1, %0 ! __cmpxchg_u32 \n\t"
+ "mov %0, %2 \n\t"
+ "cmp/eq %2, %4 \n\t"
+ "bf 2f \n\t"
+ "mov %5, %0 \n\t"
+ "2: \n\t"
+ "movco.l %0, @%1 \n\t"
+ "bf 1b \n\t"
+ "synco \n\t"
+ : "=&z" (tmp), "=r" (m), "=&r" (retval)
+ : "1" (m), "r" (old), "r" (new)
+ : "t", "memory"
+ );
+
+ return retval;
+}
+
+#endif /* __ASM_SH_CMPXCHG_LLSC_H */
diff --git a/arch/sh/include/asm/system.h b/arch/sh/include/asm/system.h
index 056d68cd210..fbac113bbfb 100644
--- a/arch/sh/include/asm/system.h
+++ b/arch/sh/include/asm/system.h
@@ -70,6 +70,8 @@
#ifdef CONFIG_GUSA_RB
#include <asm/cmpxchg-grb.h>
+#elif defined(CONFIG_CPU_SH4A)
+#include <asm/cmpxchg-llsc.h>
#else
#include <asm/cmpxchg-irq.h>
#endif