diff options
Diffstat (limited to 'arch/xtensa/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/xtensa/include/asm/cmpxchg.h | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h index 22a10c715c1f..7ccc5cbf441b 100644 --- a/arch/xtensa/include/asm/cmpxchg.h +++ b/arch/xtensa/include/asm/cmpxchg.h @@ -23,7 +23,24 @@ static inline unsigned long __cmpxchg_u32(volatile int *p, int old, int new) { -#if XCHAL_HAVE_S32C1I +#if XCHAL_HAVE_EXCLUSIVE + unsigned long tmp, result; + + __asm__ __volatile__( + "1: l32ex %0, %3\n" + " bne %0, %4, 2f\n" + " mov %1, %2\n" + " s32ex %1, %3\n" + " getex %1\n" + " beqz %1, 1b\n" + "2:\n" + : "=&a" (result), "=&a" (tmp) + : "a" (new), "a" (p), "a" (old) + : "memory" + ); + + return result; +#elif XCHAL_HAVE_S32C1I __asm__ __volatile__( " wsr %2, scompare1\n" " s32c1i %0, %1, 0\n" @@ -108,7 +125,22 @@ static inline unsigned long __cmpxchg_local(volatile void *ptr, static inline unsigned long xchg_u32(volatile int * m, unsigned long val) { -#if XCHAL_HAVE_S32C1I +#if XCHAL_HAVE_EXCLUSIVE + unsigned long tmp, result; + + __asm__ __volatile__( + "1: l32ex %0, %3\n" + " mov %1, %2\n" + " s32ex %1, %3\n" + " getex %1\n" + " beqz %1, 1b\n" + : "=&a" (result), "=&a" (tmp) + : "a" (val), "a" (m) + : "memory" + ); + + return result; +#elif XCHAL_HAVE_S32C1I unsigned long tmp, result; __asm__ __volatile__( "1: l32i %1, %2, 0\n" |