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author | benno <benno@FreeBSD.org> | 2001-01-07 03:46:01 +0000 |
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committer | benno <benno@FreeBSD.org> | 2001-01-07 03:46:01 +0000 |
commit | 2031489c0d5ea71672d75139c936fbe7e081d077 (patch) | |
tree | a3821f8a079f1249bcc84bd836acf89cc0e61ad4 /sys/powerpc/include/atomic.h | |
parent | 4814964c58402679456d5cd5f24e99aa61237096 (diff) | |
download | FreeBSD-src-2031489c0d5ea71672d75139c936fbe7e081d077.zip FreeBSD-src-2031489c0d5ea71672d75139c936fbe7e081d077.tar.gz |
PowerPC atomic operation functions.
Some of these are dependant on an inline function (powerpc_mb()) that is
yet to come.
Reviewed by: obrien
Diffstat (limited to 'sys/powerpc/include/atomic.h')
-rw-r--r-- | sys/powerpc/include/atomic.h | 354 |
1 files changed, 298 insertions, 56 deletions
diff --git a/sys/powerpc/include/atomic.h b/sys/powerpc/include/atomic.h index a044891..ebd45ba 100644 --- a/sys/powerpc/include/atomic.h +++ b/sys/powerpc/include/atomic.h @@ -1,4 +1,5 @@ /*- + * Copyright (c) 2001 Benno Rice * Copyright (c) 2001 David E. O'Brien * Copyright (c) 1998 Doug Rabson * All rights reserved. @@ -30,6 +31,8 @@ #ifndef _MACHINE_ATOMIC_H_ #define _MACHINE_ATOMIC_H_ +#include <machine/cpufunc.h> + /* * Various simple arithmetic on memory which is atomic in the presence * of interrupts and SMP safe. @@ -45,138 +48,284 @@ void atomic_clear_16(volatile u_int16_t *, u_int16_t); void atomic_add_16(volatile u_int16_t *, u_int16_t); void atomic_subtract_16(volatile u_int16_t *, u_int16_t); -static __inline void atomic_set_32(volatile u_int32_t *p, u_int32_t v) +static __inline void +atomic_set_32(volatile u_int32_t *p, u_int32_t v) { u_int32_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + "1:\tlwarx %0, 0, %2\n\t" /* load old value */ + "or %0, %0, %3\n\t" /* calculate new value */ + "stwcx. %0, 0, %1\n\t" /* attempt to store */ + "bne- 1\n\t" /* spin if failed */ + "eieio\n" /* drain to memory */ + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline void atomic_clear_32(volatile u_int32_t *p, u_int32_t v) +static __inline void +atomic_clear_32(volatile u_int32_t *p, u_int32_t v) { u_int32_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + "1:\tlwarx %0, 0, %2\n\t" /* load old value */ + "andc %0, %0, %3\n\t" /* calculate new value */ + "stwcx. %0, 0, %1\n\t" /* attempt to store */ + "bne- 1\n\t" /* spin if failed */ + "eieio\n" /* drain to memory */ + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline void atomic_add_32(volatile u_int32_t *p, u_int32_t v) +static __inline void +atomic_add_32(volatile u_int32_t *p, u_int32_t v) { u_int32_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + "1:\tlwarx %0, 0, %2\n\t" /* load old value */ + "add %0, %0, %3\n\t" /* calculate new value */ + "stwcx. %0, 0, %1\n\t" /* attempt to store */ + "bne- 1\n\t" /* spin if failed */ + "eieio\n" /* Old McDonald had a farm */ + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline void atomic_subtract_32(volatile u_int32_t *p, u_int32_t v) +static __inline void +atomic_subtract_32(volatile u_int32_t *p, u_int32_t v) { u_int32_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + "1:\tlwarx %0, 0, %2\n\t" /* load old value */ + "sub %0, %3, %0\n\t" /* calculate new value */ + "stwcx. %0, 0, %1\n\t" /* attempt to store */ + "bne- 1\n\t" /* spin if failed */ + "eieio\n" /* drain to memory */ + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline u_int32_t atomic_readandclear_32(volatile u_int32_t *addr) +static __inline u_int32_t +atomic_readandclear_32(volatile u_int32_t *addr) { u_int32_t result,temp; __asm __volatile ( - : "=&r"(result), "=&r"(temp), "=m" (*addr) - : "m"(*addr) + "\teieio\n" /* memory barrier */ + "1:\tlwarx %0, 0, %3\n\t" /* load old value */ + "li %1, 0\n\t" /* load new value */ + "stwcx. %1, 0, %2\n\t" /* attempt to store */ + "bne- 1\n\t" /* spin if failed */ + "eieio\n" /* drain to memory */ + : "=&r"(result), "=&r"(temp), "=r" (*addr) + : "r"(*addr) : "memory"); return result; } -static __inline void atomic_set_64(volatile u_int64_t *p, u_int64_t v) +#if 0 + +/* + * So far I haven't found a way to implement atomic 64-bit ops on the + * 32-bit PowerPC without involving major headaches. If anyone has + * any ideas, please let me know. =) + * - benno@FreeBSD.org + */ + +static __inline void +atomic_set_64(volatile u_int64_t *p, u_int64_t v) { u_int64_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline void atomic_clear_64(volatile u_int64_t *p, u_int64_t v) +static __inline void +atomic_clear_64(volatile u_int64_t *p, u_int64_t v) { u_int64_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline void atomic_add_64(volatile u_int64_t *p, u_int64_t v) +static __inline void +atomic_add_64(volatile u_int64_t *p, u_int64_t v) { u_int64_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline void atomic_subtract_64(volatile u_int64_t *p, u_int64_t v) +static __inline void +atomic_subtract_64(volatile u_int64_t *p, u_int64_t v) { u_int64_t temp; __asm __volatile ( - : "=&r" (temp), "=m" (*p) - : "m" (*p), "r" (v) + : "=&r" (temp), "=r" (*p) + : "r" (*p), "r" (v) : "memory"); } -static __inline u_int64_t atomic_readandclear_64(volatile u_int64_t *addr) +static __inline u_int64_t +atomic_readandclear_64(volatile u_int64_t *addr) { u_int64_t result,temp; __asm __volatile ( - : "=&r"(result), "=&r"(temp), "=m" (*addr) - : "m"(*addr) + : "=&r"(result), "=&r"(temp), "=r" (*addr) + : "r"(*addr) : "memory"); return result; } -#define atomic_set_char atomic_set_8 -#define atomic_clear_char atomic_clear_8 -#define atomic_add_char atomic_add_8 -#define atomic_subtract_char atomic_subtract_8 +#endif /* 0 */ -#define atomic_set_short atomic_set_16 -#define atomic_clear_short atomic_clear_16 -#define atomic_add_short atomic_add_16 -#define atomic_subtract_short atomic_subtract_16 +#define atomic_set_char atomic_set_8 +#define atomic_clear_char atomic_clear_8 +#define atomic_add_char atomic_add_8 +#define atomic_subtract_char atomic_subtract_8 -#define atomic_set_int atomic_set_32 -#define atomic_clear_int atomic_clear_32 -#define atomic_add_int atomic_add_32 -#define atomic_subtract_int atomic_subtract_32 -#define atomic_readandclear_int atomic_readandclear_32 +#define atomic_set_short atomic_set_16 +#define atomic_clear_short atomic_clear_16 +#define atomic_add_short atomic_add_16 +#define atomic_subtract_short atomic_subtract_16 -#define atomic_set_long atomic_set_32 -#define atomic_clear_long atomic_clear_32 -#define atomic_add_long atomic_add_32 -#define atomic_subtract_long atomic_subtract_32 +#define atomic_set_int atomic_set_32 +#define atomic_clear_int atomic_clear_32 +#define atomic_add_int atomic_add_32 +#define atomic_subtract_int atomic_subtract_32 +#define atomic_readandclear_int atomic_readandclear_32 + +#define atomic_set_long atomic_set_32 +#define atomic_clear_long atomic_clear_32 +#define atomic_add_long atomic_add_32 +#define atomic_subtract_long atomic_subtract_32 #define atomic_readandclear_long atomic_readandclear_32 -#define atomic_set_long_long atomic_set_64 -#define atomic_clear_long_long atomic_clear_64 -#define atomic_add_long_long atomic_add_64 +#if 0 + +/* See above. */ + +#define atomic_set_long_long atomic_set_64 +#define atomic_clear_long_long atomic_clear_64 +#define atomic_add_long_long atomic_add_64 #define atomic_subtract_long_long atomic_subtract_64 #define atomic_readandclear_long_long atomic_readandclear_64 +#endif /* 0 */ + +#define ATOMIC_ACQ_REL(NAME, WIDTH, TYPE) \ +static __inline void \ +atomic_##NAME##_acq_##WIDTH(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ +{ \ + powerpc_mb(); \ + atomic_##NAME##_##WIDTH(p, v); \ +} \ + \ +static __inline void \ +atomic_##NAME##_rel_##WIDTH(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ +{ \ + atomic_##NAME##_##WIDTH(p, v); \ + powerpc_mb(); \ +} \ + \ +static __inline void \ +atomic_##NAME##_acq_##TYPE(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ +{ \ + powerpc_mb(); \ + atomic_##NAME##_##WIDTH(p, v); \ +} \ + \ +static __inline void \ +atomic_##NAME##_rel_##TYPE(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ +{ \ + atomic_##NAME##_##WIDTH(p, v); \ + powerpc_mb(); \ +} + +ATOMIC_ACQ_REL(set, 8, char) +ATOMIC_ACQ_REL(clear, 8, char) +ATOMIC_ACQ_REL(add, 8, char) +ATOMIC_ACQ_REL(subtract, 8, char) +ATOMIC_ACQ_REL(set, 16, short) +ATOMIC_ACQ_REL(clear, 16, short) +ATOMIC_ACQ_REL(add, 16, short) +ATOMIC_ACQ_REL(subtract, 16, short) +ATOMIC_ACQ_REL(set, 32, int) +ATOMIC_ACQ_REL(clear, 32, int) +ATOMIC_ACQ_REL(add, 32, int) +ATOMIC_ACQ_REL(subtract, 32, int) + +#define atomic_set_acq_long atomic_set_acq_32 +#define atomic_set_rel_long atomic_set_rel_32 +#define atomic_clear_acq_long atomic_clear_acq_32 +#define atomic_clear_rel_long atomic_clear_rel_32 +#define atomic_add_acq_long atomic_add_acq_32 +#define atomic_add_rel_long atomic_add_rel_32 +#define atomic_subtract_acq_long atomic_subtract_acq_32 +#define atomic_subtract_rel_long atomic_subtract_rel_32 + +#undef ATOMIC_ACQ_REL + +/* + * We assume that a = b will do atomic loads and stores. + */ +#define ATOMIC_STORE_LOAD(TYPE, WIDTH) \ +static __inline u_##TYPE \ +atomic_load_acq_##WIDTH(volatile u_##TYPE *p) \ +{ \ + powerpc_mb(); \ + return (*p); \ +} \ + \ +static __inline void \ +atomic_store_rel_##WIDTH(volatile u_##TYPE *p, u_##TYPE v) \ +{ \ + *p = v; \ + powerpc_mb(); \ +} \ +static __inline u_##TYPE \ +atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ +{ \ + powerpc_mb(); \ + return (*p); \ +} \ + \ +static __inline void \ +atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) \ +{ \ + *p = v; \ + powerpc_mb(); \ +} + +ATOMIC_STORE_LOAD(char, 8) +ATOMIC_STORE_LOAD(short, 16) +ATOMIC_STORE_LOAD(int, 32) + +#define atomic_load_acq_long atomic_load_acq_32 +#define atomic_store_rel_long atomic_store_rel_32 + +#undef ATOMIC_STORE_LOAD + /* * Atomically compare the value stored at *p with cmpval and if the * two values are equal, update the value of *p with newval. Returns @@ -188,13 +337,23 @@ atomic_cmpset_32(volatile u_int32_t* p, u_int32_t cmpval, u_int32_t newval) u_int32_t ret; __asm __volatile ( - : "=&r" (ret), "=m" (*p) - : "r" (cmpval), "r" (newval), "m" (*p) + "1:\tlwarx %0, 0, %4\n\t" /* load old value */ + "cmplw 0, %2, %0\n\t" /* compare */ + "bne 2\n\t" /* exit if not equal */ + "mr %0, %3\n\t" /* value to store */ + "stwcx. %0, 0, %1\n\t" /* attempt to store */ + "bne- 1\n\t" /* spin if failed */ + "eieio\n" /* memory barrier */ + "2:\t\n" + : "=&r" (ret), "=r" (*p) + : "r" (cmpval), "r" (newval), "r" (*p) : "memory"); return ret; } +#if 0 + /* * Atomically compare the value stored at *p with cmpval and if the * two values are equal, update the value of *p with newval. Returns @@ -206,23 +365,106 @@ atomic_cmpset_64(volatile u_int64_t* p, u_int64_t cmpval, u_int64_t newval) u_int64_t ret; __asm __volatile ( - : "=&r" (ret), "=m" (*p) - : "r" (cmpval), "r" (newval), "m" (*p) + : "=&r" (ret), "=r" (*p) + : "r" (cmpval), "r" (newval), "r" (*p) : "memory"); return ret; } +#endif /* 0 */ + #define atomic_cmpset_int atomic_cmpset_32 #define atomic_cmpset_long atomic_cmpset_32 + +#if 0 #define atomic_cmpset_long_long atomic_cmpset_64 +#endif /* 0 */ static __inline int atomic_cmpset_ptr(volatile void *dst, void *exp, void *src) { - return ( - atomic_cmpset_long((volatile u_long *)dst, (u_long)exp, (u_long)src)); + return (atomic_cmpset_32((volatile u_int32_t *)dst, (u_int32_t)exp, + (u_int32_t)src)); +} + +static __inline u_int32_t +atomic_cmpset_acq_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval) +{ + + powerpc_mb(); + return (atomic_cmpset_32(p, cmpval, newval)); } +static __inline u_int32_t +atomic_cmpset_rel_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval) +{ + int retval; + + retval = atomic_cmpset_32(p, cmpval, newval); + powerpc_mb(); + return (retval); +} + +#define atomic_cmpset_acq_int atomic_cmpset_acq_32 +#define atomic_cmpset_rel_int atomic_cmpset_rel_32 +#define atomic_cmpset_acq_long atomic_cmpset_acq_32 +#define atomic_cmpset_rel_long atomic_cmpset_rel_32 + +static __inline int +atomic_cmpset_acq_ptr(volatile void *dst, void *exp, void *src) +{ + + return (atomic_cmpset_acq_long((volatile u_int32_t *)dst, + (u_int32_t)exp, (u_int32_t)src)); +} + +static __inline int +atomic_cmpset_rel_ptr(volatile void *dst, void *exp, void *src) +{ + + return (atomic_cmpset_rel_long((volatile u_int32_t *)dst, + (u_int32_t)exp, (u_int32_t)src)); +} + +static __inline void * +atomic_load_acq_ptr(volatile void *p) +{ + + return (void *)atomic_load_acq_long((volatile u_int32_t *)p); +} + +static __inline void +atomic_store_rel_ptr(volatile void *p, void *v) +{ + + atomic_store_rel_long((volatile u_int32_t *)p, (u_int32_t)v); +} + +#define ATOMIC_PTR(NAME) \ +static __inline void \ +atomic_##NAME##_ptr(volatile void *p, uintptr_t v) \ +{ \ + atomic_##NAME##_long((volatile u_int32_t *)p, v); \ +} \ + \ +static __inline void \ +atomic_##NAME##_acq_ptr(volatile void *p, uintptr_t v) \ +{ \ + atomic_##NAME##_acq_long((volatile u_int32_t *)p, v); \ +} \ + \ +static __inline void \ +atomic_##NAME##_rel_ptr(volatile void *p, uintptr_t v) \ +{ \ + atomic_##NAME##_rel_long((volatile u_int32_t *)p, v); \ +} + +ATOMIC_PTR(set) +ATOMIC_PTR(clear) +ATOMIC_PTR(add) +ATOMIC_PTR(subtract) + +#undef ATOMIC_PTR #endif /* ! _MACHINE_ATOMIC_H_ */ |