diff options
Diffstat (limited to 'kernel/arch/sh/include/asm/cmpxchg-grb.h')
| -rw-r--r-- | kernel/arch/sh/include/asm/cmpxchg-grb.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/kernel/arch/sh/include/asm/cmpxchg-grb.h b/kernel/arch/sh/include/asm/cmpxchg-grb.h new file mode 100644 index 000000000..f848dec9e --- /dev/null +++ b/kernel/arch/sh/include/asm/cmpxchg-grb.h @@ -0,0 +1,72 @@ +#ifndef __ASM_SH_CMPXCHG_GRB_H +#define __ASM_SH_CMPXCHG_GRB_H + +static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) +{ + unsigned long retval; + + __asm__ __volatile__ ( + " .align 2 \n\t" + " mova 1f, r0 \n\t" /* r0 = end point */ + " nop \n\t" + " mov r15, r1 \n\t" /* r1 = saved sp */ + " mov #-4, r15 \n\t" /* LOGIN */ + " mov.l @%1, %0 \n\t" /* load old value */ + " mov.l %2, @%1 \n\t" /* store new value */ + "1: mov r1, r15 \n\t" /* LOGOUT */ + : "=&r" (retval), + "+r" (m), + "+r" (val) /* inhibit r15 overloading */ + : + : "memory", "r0", "r1"); + + return retval; +} + +static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) +{ + unsigned long retval; + + __asm__ __volatile__ ( + " .align 2 \n\t" + " mova 1f, r0 \n\t" /* r0 = end point */ + " mov r15, r1 \n\t" /* r1 = saved sp */ + " mov #-6, r15 \n\t" /* LOGIN */ + " mov.b @%1, %0 \n\t" /* load old value */ + " extu.b %0, %0 \n\t" /* extend as unsigned */ + " mov.b %2, @%1 \n\t" /* store new value */ + "1: mov r1, r15 \n\t" /* LOGOUT */ + : "=&r" (retval), + "+r" (m), + "+r" (val) /* inhibit r15 overloading */ + : + : "memory" , "r0", "r1"); + + return retval; +} + +static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, + unsigned long new) +{ + unsigned long retval; + + __asm__ __volatile__ ( + " .align 2 \n\t" + " mova 1f, r0 \n\t" /* r0 = end point */ + " nop \n\t" + " mov r15, r1 \n\t" /* r1 = saved sp */ + " mov #-8, r15 \n\t" /* LOGIN */ + " mov.l @%3, %0 \n\t" /* load old value */ + " cmp/eq %0, %1 \n\t" + " bf 1f \n\t" /* if not equal */ + " mov.l %2, @%3 \n\t" /* store new value */ + "1: mov r1, r15 \n\t" /* LOGOUT */ + : "=&r" (retval), + "+r" (old), "+r" (new) /* old or new can be r15 */ + : "r" (m) + : "memory" , "r0", "r1", "t"); + + return retval; +} + +#endif /* __ASM_SH_CMPXCHG_GRB_H */ |