| /*- |
| * Copyright (c) 2001 Benno Rice |
| * Copyright (c) 2001 David E. O'Brien |
| * Copyright (c) 1998 Doug Rabson |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD: src/sys/powerpc/include/atomic.h,v 1.11.2.3 2005/10/06 18:12:06 jhb Exp $ |
| */ |
| |
| #ifndef _MACHINE_ATOMIC_H_ |
| #define _MACHINE_ATOMIC_H_ |
| |
| /* |
| * Required for user-space atomic.h includes |
| */ |
| static __inline void |
| powerpc_mb(void) |
| { |
| |
| __asm __volatile("eieio; sync" : : : "memory"); |
| } |
| |
| /* |
| * Various simple arithmetic on memory which is atomic in the presence |
| * of interrupts and SMP safe. |
| */ |
| |
| void atomic_set_8(volatile uint8_t *, uint8_t); |
| void atomic_clear_8(volatile uint8_t *, uint8_t); |
| void atomic_add_8(volatile uint8_t *, uint8_t); |
| void atomic_subtract_8(volatile uint8_t *, uint8_t); |
| |
| void atomic_set_16(volatile uint16_t *, uint16_t); |
| void atomic_clear_16(volatile uint16_t *, uint16_t); |
| void atomic_add_16(volatile uint16_t *, uint16_t); |
| void atomic_subtract_16(volatile uint16_t *, uint16_t); |
| |
| static __inline void |
| atomic_set_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tlwarx %0, 0, %2\n\t" /* load old value */ |
| "or %0, %3, %0\n\t" /* calculate new value */ |
| "stwcx. %0, 0, %2\n\t" /* attempt to store */ |
| "bne- 1b\n\t" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (p), "r" (v), "m" (*p) |
| : "cc", "memory"); |
| } |
| |
| static __inline void |
| atomic_clear_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tlwarx %0, 0, %2\n\t" /* load old value */ |
| "andc %0, %0, %3\n\t" /* calculate new value */ |
| "stwcx. %0, 0, %2\n\t" /* attempt to store */ |
| "bne- 1b\n\t" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (p), "r" (v), "m" (*p) |
| : "cc", "memory"); |
| } |
| |
| static __inline void |
| atomic_add_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tlwarx %0, 0, %2\n\t" /* load old value */ |
| "add %0, %3, %0\n\t" /* calculate new value */ |
| "stwcx. %0, 0, %2\n\t" /* attempt to store */ |
| "bne- 1b\n\t" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (p), "r" (v), "m" (*p) |
| : "cc", "memory"); |
| } |
| |
| static __inline void |
| atomic_subtract_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t temp; |
| |
| __asm __volatile ( |
| "1:\tlwarx %0, 0, %2\n\t" /* load old value */ |
| "subf %0, %3, %0\n\t" /* calculate new value */ |
| "stwcx. %0, 0, %2\n\t" /* attempt to store */ |
| "bne- 1b\n\t" /* spin if failed */ |
| : "=&r" (temp), "=m" (*p) |
| : "r" (p), "r" (v), "m" (*p) |
| : "cc", "memory"); |
| } |
| |
| static __inline uint32_t |
| atomic_readandclear_32(volatile uint32_t *addr) |
| { |
| uint32_t result,temp; |
| |
| __asm __volatile ( |
| "\tsync\n" /* drain writes */ |
| "1:\tlwarx %0, 0, %3\n\t" /* load old value */ |
| "li %1, 0\n\t" /* load new value */ |
| "stwcx. %1, 0, %3\n\t" /* attempt to store */ |
| "bne- 1b\n\t" /* spin if failed */ |
| : "=&r"(result), "=&r"(temp), "=m" (*addr) |
| : "r" (addr), "m" (*addr) |
| : "cc", "memory"); |
| |
| return (result); |
| } |
| |
| #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), "=r" (*p) |
| : "r" (*p), "r" (v) |
| : "memory"); |
| } |
| |
| static __inline void |
| atomic_clear_64(volatile u_int64_t *p, u_int64_t v) |
| { |
| u_int64_t temp; |
| |
| __asm __volatile ( |
| : "=&r" (temp), "=r" (*p) |
| : "r" (*p), "r" (v) |
| : "memory"); |
| } |
| |
| static __inline void |
| atomic_add_64(volatile u_int64_t *p, u_int64_t v) |
| { |
| u_int64_t temp; |
| |
| __asm __volatile ( |
| : "=&r" (temp), "=r" (*p) |
| : "r" (*p), "r" (v) |
| : "memory"); |
| } |
| |
| static __inline void |
| atomic_subtract_64(volatile u_int64_t *p, u_int64_t v) |
| { |
| u_int64_t temp; |
| |
| __asm __volatile ( |
| : "=&r" (temp), "=r" (*p) |
| : "r" (*p), "r" (v) |
| : "memory"); |
| } |
| |
| static __inline u_int64_t |
| atomic_readandclear_64(volatile u_int64_t *addr) |
| { |
| u_int64_t result,temp; |
| |
| __asm __volatile ( |
| : "=&r"(result), "=&r"(temp), "=r" (*addr) |
| : "r"(*addr) |
| : "memory"); |
| |
| return result; |
| } |
| |
| #endif /* 0 */ |
| |
| #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_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_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(p, v) atomic_add_32((uint32_t *)p, (uint32_t)v) |
| #define atomic_subtract_long(p, v) atomic_subtract_32((uint32_t *)p, (uint32_t)v) |
| #define atomic_readandclear_long atomic_readandclear_32 |
| |
| #define atomic_set_ptr atomic_set_32 |
| #define atomic_clear_ptr atomic_clear_32 |
| #define atomic_add_ptr atomic_add_32 |
| #define atomic_subtract_ptr atomic_subtract_32 |
| |
| #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) \ |
| { \ |
| atomic_##NAME##_##WIDTH(p, v); \ |
| powerpc_mb(); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_##NAME##_rel_##WIDTH(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ |
| { \ |
| powerpc_mb(); \ |
| atomic_##NAME##_##WIDTH(p, v); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_##NAME##_acq_##TYPE(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ |
| { \ |
| atomic_##NAME##_##WIDTH(p, v); \ |
| powerpc_mb(); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_##NAME##_rel_##TYPE(volatile u_int##WIDTH##_t *p, u_int##WIDTH##_t v) \ |
| { \ |
| powerpc_mb(); \ |
| atomic_##NAME##_##WIDTH(p, v); \ |
| } |
| |
| 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 |
| |
| #define atomic_set_acq_ptr atomic_set_acq_32 |
| #define atomic_set_rel_ptr atomic_set_rel_32 |
| #define atomic_clear_acq_ptr atomic_clear_acq_32 |
| #define atomic_clear_rel_ptr atomic_clear_rel_32 |
| #define atomic_add_acq_ptr atomic_add_acq_32 |
| #define atomic_add_rel_ptr atomic_add_rel_32 |
| #define atomic_subtract_acq_ptr atomic_subtract_acq_32 |
| #define atomic_subtract_rel_ptr 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) \ |
| { \ |
| u_##TYPE v; \ |
| \ |
| v = *p; \ |
| powerpc_mb(); \ |
| return (v); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_store_rel_##WIDTH(volatile u_##TYPE *p, u_##TYPE v) \ |
| { \ |
| powerpc_mb(); \ |
| *p = v; \ |
| } \ |
| \ |
| static __inline u_##TYPE \ |
| atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ |
| { \ |
| u_##TYPE v; \ |
| \ |
| v = *p; \ |
| powerpc_mb(); \ |
| return (v); \ |
| } \ |
| \ |
| static __inline void \ |
| atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) \ |
| { \ |
| powerpc_mb(); \ |
| *p = v; \ |
| } |
| |
| 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 |
| |
| #define atomic_load_acq_ptr atomic_load_acq_32 |
| #define atomic_store_rel_ptr 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 |
| * zero if the compare failed, nonzero otherwise. |
| */ |
| static __inline uint32_t |
| atomic_cmpset_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) |
| { |
| uint32_t ret; |
| |
| __asm __volatile ( |
| "1:\tlwarx %0, 0, %2\n\t" /* load old value */ |
| "cmplw %3, %0\n\t" /* compare */ |
| "bne 2f\n\t" /* exit if not equal */ |
| "stwcx. %4, 0, %2\n\t" /* attempt to store */ |
| "bne- 1b\n\t" /* spin if failed */ |
| "li %0, 1\n\t" /* success - retval = 1 */ |
| "b 3f\n\t" /* we've succeeded */ |
| "2:\n\t" |
| "stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */ |
| "li %0, 0\n\t" /* failure - retval = 0 */ |
| "3:\n\t" |
| : "=&r" (ret), "=m" (*p) |
| : "r" (p), "r" (cmpval), "r" (newval), "m" (*p) |
| : "cc", "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 |
| * zero if the compare failed, nonzero otherwise. |
| */ |
| static __inline u_int64_t |
| atomic_cmpset_64(volatile u_int64_t* p, u_int64_t cmpval, u_int64_t newval) |
| { |
| u_int64_t ret; |
| |
| __asm __volatile ( |
| : "=&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 |
| #define atomic_cmpset_ptr atomic_cmpset_32 |
| |
| #if 0 |
| #define atomic_cmpset_long_long atomic_cmpset_64 |
| #endif /* 0 */ |
| |
| static __inline uint32_t |
| atomic_cmpset_acq_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval) |
| { |
| int retval; |
| |
| retval = atomic_cmpset_32(p, cmpval, newval); |
| powerpc_mb(); |
| return (retval); |
| } |
| |
| static __inline uint32_t |
| atomic_cmpset_rel_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval) |
| { |
| powerpc_mb(); |
| return (atomic_cmpset_32(p, cmpval, newval)); |
| } |
| |
| #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 |
| #define atomic_cmpset_acq_ptr atomic_cmpset_acq_32 |
| #define atomic_cmpset_rel_ptr atomic_cmpset_rel_32 |
| |
| static __inline uint32_t |
| atomic_fetchadd_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t value; |
| |
| do { |
| value = *p; |
| } while (!atomic_cmpset_32(p, value, value + v)); |
| return (value); |
| } |
| |
| static __inline uint32_t |
| atomic_fetchsubtract_32(volatile uint32_t *p, uint32_t v) |
| { |
| uint32_t value; |
| |
| do { |
| value = *p; |
| } while (!atomic_cmpset_32(p, value, value - v)); |
| return (value); |
| } |
| |
| #define atomic_fetchadd_int atomic_fetchadd_32 |
| #define atomic_fetchsubtract_int atomic_fetchsubtract_32 |
| |
| #endif /* ! _MACHINE_ATOMIC_H_ */ |
