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sh: Provide movli.l/movco.l-based cmpxchg.

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Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-08-07 18:01:43 +09:00
parent 742fd1bcfb
commit ee43a8442b
2 changed files with 73 additions and 0 deletions
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71
arch/sh/include/asm/cmpxchg-llsc.h Normal file
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@ -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 */

2
arch/sh/include/asm/system.h
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@ -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