From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/sparc64/lib/atomic.S | 139 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 arch/sparc64/lib/atomic.S (limited to 'arch/sparc64/lib/atomic.S') diff --git a/arch/sparc64/lib/atomic.S b/arch/sparc64/lib/atomic.S new file mode 100644 index 00000000000..e528b8d1a3e --- /dev/null +++ b/arch/sparc64/lib/atomic.S @@ -0,0 +1,139 @@ +/* $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 +#include + + /* On SMP we need to use memory barriers to ensure + * correct memory operation ordering, nop these out + * for uniprocessor. + */ +#ifdef CONFIG_SMP +#define ATOMIC_PRE_BARRIER membar #StoreLoad | #LoadLoad +#define ATOMIC_POST_BARRIER membar #StoreLoad | #StoreStore +#else +#define ATOMIC_PRE_BARRIER nop +#define ATOMIC_POST_BARRIER nop +#endif + + .text + + /* Two versions of the atomic routines, one that + * does not return a value and does not perform + * memory barriers, and a second which returns + * a value and does the barriers. + */ + .globl atomic_add + .type atomic_add,#function +atomic_add: /* %o0 = increment, %o1 = atomic_ptr */ +1: lduw [%o1], %g1 + add %g1, %o0, %g7 + cas [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + nop + retl + nop + .size atomic_add, .-atomic_add + + .globl atomic_sub + .type atomic_sub,#function +atomic_sub: /* %o0 = decrement, %o1 = atomic_ptr */ +1: lduw [%o1], %g1 + sub %g1, %o0, %g7 + cas [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + nop + retl + nop + .size atomic_sub, .-atomic_sub + + .globl atomic_add_ret + .type atomic_add_ret,#function +atomic_add_ret: /* %o0 = increment, %o1 = atomic_ptr */ + ATOMIC_PRE_BARRIER +1: lduw [%o1], %g1 + add %g1, %o0, %g7 + cas [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + add %g7, %o0, %g7 + ATOMIC_POST_BARRIER + retl + sra %g7, 0, %o0 + .size atomic_add_ret, .-atomic_add_ret + + .globl atomic_sub_ret + .type atomic_sub_ret,#function +atomic_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */ + ATOMIC_PRE_BARRIER +1: lduw [%o1], %g1 + sub %g1, %o0, %g7 + cas [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + sub %g7, %o0, %g7 + ATOMIC_POST_BARRIER + retl + sra %g7, 0, %o0 + .size atomic_sub_ret, .-atomic_sub_ret + + .globl atomic64_add + .type atomic64_add,#function +atomic64_add: /* %o0 = increment, %o1 = atomic_ptr */ +1: ldx [%o1], %g1 + add %g1, %o0, %g7 + casx [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %xcc, 1b + nop + retl + nop + .size atomic64_add, .-atomic64_add + + .globl atomic64_sub + .type atomic64_sub,#function +atomic64_sub: /* %o0 = decrement, %o1 = atomic_ptr */ +1: ldx [%o1], %g1 + sub %g1, %o0, %g7 + casx [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %xcc, 1b + nop + retl + nop + .size atomic64_sub, .-atomic64_sub + + .globl atomic64_add_ret + .type atomic64_add_ret,#function +atomic64_add_ret: /* %o0 = increment, %o1 = atomic_ptr */ + ATOMIC_PRE_BARRIER +1: ldx [%o1], %g1 + add %g1, %o0, %g7 + casx [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %xcc, 1b + add %g7, %o0, %g7 + ATOMIC_POST_BARRIER + retl + mov %g7, %o0 + .size atomic64_add_ret, .-atomic64_add_ret + + .globl atomic64_sub_ret + .type atomic64_sub_ret,#function +atomic64_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */ + ATOMIC_PRE_BARRIER +1: ldx [%o1], %g1 + sub %g1, %o0, %g7 + casx [%o1], %g1, %g7 + cmp %g1, %g7 + bne,pn %xcc, 1b + sub %g7, %o0, %g7 + ATOMIC_POST_BARRIER + retl + mov %g7, %o0 + .size atomic64_sub_ret, .-atomic64_sub_ret -- cgit v1.2.3