atomic.S
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上传日期:2013-04-10
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- /* $Id: atomic.S,v 1.4 2001/11/18 00:12:56 davem Exp $
- * atomic.S: These things are too big to do inline.
- *
- * Copyright (C) 1999 David S. Miller (davem@redhat.com)
- */
- #include <asm/asi.h>
- .text
- .align 64
- .globl atomic_impl_begin, atomic_impl_end
- .globl __atomic_add
- atomic_impl_begin:
- __atomic_add: /* %o0 = increment, %o1 = atomic_ptr */
- lduw [%o1], %g5
- add %g5, %o0, %g7
- cas [%o1], %g5, %g7
- cmp %g5, %g7
- bne,pn %icc, __atomic_add
- membar #StoreLoad | #StoreStore
- retl
- add %g7, %o0, %o0
- .globl __atomic_sub
- __atomic_sub: /* %o0 = increment, %o1 = atomic_ptr */
- lduw [%o1], %g5
- sub %g5, %o0, %g7
- cas [%o1], %g5, %g7
- cmp %g5, %g7
- bne,pn %icc, __atomic_sub
- membar #StoreLoad | #StoreStore
- retl
- sub %g7, %o0, %o0
- atomic_impl_end: