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| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
| commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
| tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/sparc/lib/atomic_64.S | |
Initial import
Diffstat (limited to 'arch/sparc/lib/atomic_64.S')
| -rw-r--r-- | arch/sparc/lib/atomic_64.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/sparc/lib/atomic_64.S b/arch/sparc/lib/atomic_64.S new file mode 100644 index 000000000..05dac4390 --- /dev/null +++ b/arch/sparc/lib/atomic_64.S @@ -0,0 +1,104 @@ +/* atomic.S: These things are too big to do inline. + * + * Copyright (C) 1999, 2007 2012 David S. Miller (davem@davemloft.net) + */ + +#include <linux/linkage.h> +#include <asm/asi.h> +#include <asm/backoff.h> + + .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. + */ + +#define ATOMIC_OP(op) \ +ENTRY(atomic_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ + BACKOFF_SETUP(%o2); \ +1: lduw [%o1], %g1; \ + op %g1, %o0, %g7; \ + cas [%o1], %g1, %g7; \ + cmp %g1, %g7; \ + bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ + nop; \ + retl; \ + nop; \ +2: BACKOFF_SPIN(%o2, %o3, 1b); \ +ENDPROC(atomic_##op); \ + +#define ATOMIC_OP_RETURN(op) \ +ENTRY(atomic_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ + BACKOFF_SETUP(%o2); \ +1: lduw [%o1], %g1; \ + op %g1, %o0, %g7; \ + cas [%o1], %g1, %g7; \ + cmp %g1, %g7; \ + bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ + op %g1, %o0, %g1; \ + retl; \ + sra %g1, 0, %o0; \ +2: BACKOFF_SPIN(%o2, %o3, 1b); \ +ENDPROC(atomic_##op##_return); + +#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) + +ATOMIC_OPS(add) +ATOMIC_OPS(sub) + +#undef ATOMIC_OPS +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP + +#define ATOMIC64_OP(op) \ +ENTRY(atomic64_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ + BACKOFF_SETUP(%o2); \ +1: ldx [%o1], %g1; \ + op %g1, %o0, %g7; \ + casx [%o1], %g1, %g7; \ + cmp %g1, %g7; \ + bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ + nop; \ + retl; \ + nop; \ +2: BACKOFF_SPIN(%o2, %o3, 1b); \ +ENDPROC(atomic64_##op); \ + +#define ATOMIC64_OP_RETURN(op) \ +ENTRY(atomic64_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ + BACKOFF_SETUP(%o2); \ +1: ldx [%o1], %g1; \ + op %g1, %o0, %g7; \ + casx [%o1], %g1, %g7; \ + cmp %g1, %g7; \ + bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ + nop; \ + retl; \ + op %g1, %o0, %o0; \ +2: BACKOFF_SPIN(%o2, %o3, 1b); \ +ENDPROC(atomic64_##op##_return); + +#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) + +ATOMIC64_OPS(add) +ATOMIC64_OPS(sub) + +#undef ATOMIC64_OPS +#undef ATOMIC64_OP_RETURN +#undef ATOMIC64_OP + +ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */ + BACKOFF_SETUP(%o2) +1: ldx [%o0], %g1 + brlez,pn %g1, 3f + sub %g1, 1, %g7 + casx [%o0], %g1, %g7 + cmp %g1, %g7 + bne,pn %xcc, BACKOFF_LABEL(2f, 1b) + nop +3: retl + sub %g1, 1, %o0 +2: BACKOFF_SPIN(%o2, %o3, 1b) +ENDPROC(atomic64_dec_if_positive) |