/* $NetBSD: atomic.h,v 1.1 2002/10/19 12:22:34 bsh Exp $ */ /*- * Copyright (C) 2003-2004 Olivier Houchard * Copyright (C) 1994-1997 Mark Brinicombe * Copyright (C) 1994 Brini * All rights reserved. * * This code is derived from software written for Brini by Mark Brinicombe * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Brini. * 4. The name of Brini may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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. * * $FreeBSD$ */ #ifndef _MACHINE_ATOMIC_V6_H_ #define _MACHINE_ATOMIC_V6_H_ #ifndef _MACHINE_ATOMIC_H_ #error Do not include this file directly, use #endif #if __ARM_ARCH >= 7 #define isb() __asm __volatile("isb" : : : "memory") #define dsb() __asm __volatile("dsb" : : : "memory") #define dmb() __asm __volatile("dmb" : : : "memory") #elif __ARM_ARCH >= 6 #define isb() __asm __volatile("mcr p15, 0, %0, c7, c5, 4" : : "r" (0) : "memory") #define dsb() __asm __volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (0) : "memory") #define dmb() __asm __volatile("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory") #else #error Only use this file with ARMv6 and later #endif #define mb() dmb() #define wmb() dmb() #define rmb() dmb() #define ARM_HAVE_ATOMIC64 #define ATOMIC_ACQ_REL_LONG(NAME) \ static __inline void \ atomic_##NAME##_acq_long(__volatile u_long *p, u_long v) \ { \ atomic_##NAME##_long(p, v); \ dmb(); \ } \ \ static __inline void \ atomic_##NAME##_rel_long(__volatile u_long *p, u_long v) \ { \ dmb(); \ atomic_##NAME##_long(p, v); \ } #define ATOMIC_ACQ_REL(NAME, WIDTH) \ static __inline void \ atomic_##NAME##_acq_##WIDTH(__volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\ { \ atomic_##NAME##_##WIDTH(p, v); \ dmb(); \ } \ \ static __inline void \ atomic_##NAME##_rel_##WIDTH(__volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\ { \ dmb(); \ atomic_##NAME##_##WIDTH(p, v); \ } static __inline void atomic_add_32(volatile uint32_t *p, uint32_t val) { uint32_t tmp = 0, tmp2 = 0; __asm __volatile( "1: ldrex %0, [%2] \n" " add %0, %0, %3 \n" " strex %1, %0, [%2] \n" " cmp %1, #0 \n" " it ne \n" " bne 1b \n" : "=&r" (tmp), "+r" (tmp2) ,"+r" (p), "+r" (val) : : "cc", "memory"); } static __inline void atomic_add_64(volatile uint64_t *p, uint64_t val) { uint64_t tmp; uint32_t exflag; __asm __volatile( "1: \n" " ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" " adds %Q[tmp], %Q[val] \n" " adc %R[tmp], %R[tmp], %R[val] \n" " strexd %[exf], %Q[tmp], %R[tmp], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [exf] "=&r" (exflag), [tmp] "=&r" (tmp) : [ptr] "r" (p), [val] "r" (val) : "cc", "memory"); } static __inline void atomic_add_long(volatile u_long *p, u_long val) { atomic_add_32((volatile uint32_t *)p, val); } ATOMIC_ACQ_REL(add, 32) ATOMIC_ACQ_REL(add, 64) ATOMIC_ACQ_REL_LONG(add) static __inline void atomic_clear_32(volatile uint32_t *address, uint32_t setmask) { uint32_t tmp = 0, tmp2 = 0; __asm __volatile( "1: ldrex %0, [%2] \n" " bic %0, %0, %3 \n" " strex %1, %0, [%2] \n" " cmp %1, #0 \n" " it ne \n" " bne 1b \n" : "=&r" (tmp), "+r" (tmp2), "+r" (address), "+r" (setmask) : : "cc", "memory"); } static __inline void atomic_clear_64(volatile uint64_t *p, uint64_t val) { uint64_t tmp; uint32_t exflag; __asm __volatile( "1: \n" " ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" " bic %Q[tmp], %Q[val] \n" " bic %R[tmp], %R[val] \n" " strexd %[exf], %Q[tmp], %R[tmp], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [exf] "=&r" (exflag), [tmp] "=&r" (tmp) : [ptr] "r" (p), [val] "r" (val) : "cc", "memory"); } static __inline void atomic_clear_long(volatile u_long *address, u_long setmask) { atomic_clear_32((volatile uint32_t *)address, setmask); } ATOMIC_ACQ_REL(clear, 32) ATOMIC_ACQ_REL(clear, 64) ATOMIC_ACQ_REL_LONG(clear) #define ATOMIC_FCMPSET_CODE(RET, TYPE, SUF) \ { \ TYPE tmp; \ \ __asm __volatile( \ "1: ldrex" SUF " %[tmp], [%[ptr]] \n" \ " ldr %[ret], [%[oldv]] \n" \ " teq %[tmp], %[ret] \n" \ " ittee ne \n" \ " str" SUF "ne %[tmp], [%[oldv]] \n" \ " movne %[ret], #0 \n" \ " strex" SUF "eq %[ret], %[newv], [%[ptr]] \n" \ " eorseq %[ret], #1 \n" \ " beq 1b \n" \ : [ret] "=&r" (RET), \ [tmp] "=&r" (tmp) \ : [ptr] "r" (_ptr), \ [oldv] "r" (_old), \ [newv] "r" (_new) \ : "cc", "memory"); \ } #define ATOMIC_FCMPSET_CODE64(RET) \ { \ uint64_t cmp, tmp; \ \ __asm __volatile( \ "1: ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" \ " ldrd %Q[cmp], %R[cmp], [%[oldv]] \n" \ " teq %Q[tmp], %Q[cmp] \n" \ " it eq \n" \ " teqeq %R[tmp], %R[cmp] \n" \ " ittee ne \n" \ " movne %[ret], #0 \n" \ " strdne %[cmp], [%[oldv]] \n" \ " strexdeq %[ret], %Q[newv], %R[newv], [%[ptr]] \n" \ " eorseq %[ret], #1 \n" \ " beq 1b \n" \ : [ret] "=&r" (RET), \ [cmp] "=&r" (cmp), \ [tmp] "=&r" (tmp) \ : [ptr] "r" (_ptr), \ [oldv] "r" (_old), \ [newv] "r" (_new) \ : "cc", "memory"); \ } static __inline int atomic_fcmpset_8(volatile uint8_t *_ptr, uint8_t *_old, uint8_t _new) { int ret; ATOMIC_FCMPSET_CODE(ret, uint8_t, "b"); return (ret); } static __inline int atomic_fcmpset_acq_8(volatile uint8_t *_ptr, uint8_t *_old, uint8_t _new) { int ret; ATOMIC_FCMPSET_CODE(ret, uint8_t, "b"); dmb(); return (ret); } static __inline int atomic_fcmpset_rel_8(volatile uint8_t *_ptr, uint8_t *_old, uint8_t _new) { int ret; dmb(); ATOMIC_FCMPSET_CODE(ret, uint8_t, "b"); return (ret); } static __inline int atomic_fcmpset_16(volatile uint16_t *_ptr, uint16_t *_old, uint16_t _new) { int ret; ATOMIC_FCMPSET_CODE(ret, uint16_t, "h"); return (ret); } static __inline int atomic_fcmpset_acq_16(volatile uint16_t *_ptr, uint16_t *_old, uint16_t _new) { int ret; ATOMIC_FCMPSET_CODE(ret, uint16_t, "h"); dmb(); return (ret); } static __inline int atomic_fcmpset_rel_16(volatile uint16_t *_ptr, uint16_t *_old, uint16_t _new) { int ret; dmb(); ATOMIC_FCMPSET_CODE(ret, uint16_t, "h"); return (ret); } static __inline int atomic_fcmpset_32(volatile uint32_t *_ptr, uint32_t *_old, uint32_t _new) { int ret; ATOMIC_FCMPSET_CODE(ret, uint32_t, ""); return (ret); } static __inline int atomic_fcmpset_acq_32(volatile uint32_t *_ptr, uint32_t *_old, uint32_t _new) { int ret; ATOMIC_FCMPSET_CODE(ret, uint32_t, ""); dmb(); return (ret); } static __inline int atomic_fcmpset_rel_32(volatile uint32_t *_ptr, uint32_t *_old, uint32_t _new) { int ret; dmb(); ATOMIC_FCMPSET_CODE(ret, uint32_t, ""); return (ret); } static __inline int atomic_fcmpset_long(volatile long *_ptr, long *_old, long _new) { int ret; ATOMIC_FCMPSET_CODE(ret, long, ""); return (ret); } static __inline int atomic_fcmpset_acq_long(volatile long *_ptr, long *_old, long _new) { int ret; ATOMIC_FCMPSET_CODE(ret, long, ""); dmb(); return (ret); } static __inline int atomic_fcmpset_rel_long(volatile long *_ptr, long *_old, long _new) { int ret; dmb(); ATOMIC_FCMPSET_CODE(ret, long, ""); return (ret); } static __inline int atomic_fcmpset_64(volatile uint64_t *_ptr, uint64_t *_old, uint64_t _new) { int ret; ATOMIC_FCMPSET_CODE64(ret); return (ret); } static __inline int atomic_fcmpset_acq_64(volatile uint64_t *_ptr, uint64_t *_old, uint64_t _new) { int ret; ATOMIC_FCMPSET_CODE64(ret); dmb(); return (ret); } static __inline int atomic_fcmpset_rel_64(volatile uint64_t *_ptr, uint64_t *_old, uint64_t _new) { int ret; dmb(); ATOMIC_FCMPSET_CODE64(ret); return (ret); } #define ATOMIC_CMPSET_CODE(RET, SUF) \ { \ __asm __volatile( \ "1: ldrex" SUF " %[ret], [%[ptr]] \n" \ " teq %[ret], %[oldv] \n" \ " itee ne \n" \ " movne %[ret], #0 \n" \ " strex" SUF "eq %[ret], %[newv], [%[ptr]] \n" \ " eorseq %[ret], #1 \n" \ " beq 1b \n" \ : [ret] "=&r" (RET) \ : [ptr] "r" (_ptr), \ [oldv] "r" (_old), \ [newv] "r" (_new) \ : "cc", "memory"); \ } #define ATOMIC_CMPSET_CODE64(RET) \ { \ uint64_t tmp; \ \ __asm __volatile( \ "1: ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" \ " teq %Q[tmp], %Q[oldv] \n" \ " it eq \n" \ " teqeq %R[tmp], %R[oldv] \n" \ " itee ne \n" \ " movne %[ret], #0 \n" \ " strexdeq %[ret], %Q[newv], %R[newv], [%[ptr]] \n" \ " eorseq %[ret], #1 \n" \ " beq 1b \n" \ : [ret] "=&r" (RET), \ [tmp] "=&r" (tmp) \ : [ptr] "r" (_ptr), \ [oldv] "r" (_old), \ [newv] "r" (_new) \ : "cc", "memory"); \ } static __inline int atomic_cmpset_8(volatile uint8_t *_ptr, uint8_t _old, uint8_t _new) { int ret; ATOMIC_CMPSET_CODE(ret, "b"); return (ret); } static __inline int atomic_cmpset_acq_8(volatile uint8_t *_ptr, uint8_t _old, uint8_t _new) { int ret; ATOMIC_CMPSET_CODE(ret, "b"); dmb(); return (ret); } static __inline int atomic_cmpset_rel_8(volatile uint8_t *_ptr, uint8_t _old, uint8_t _new) { int ret; dmb(); ATOMIC_CMPSET_CODE(ret, "b"); return (ret); } static __inline int atomic_cmpset_16(volatile uint16_t *_ptr, uint16_t _old, uint16_t _new) { int ret; ATOMIC_CMPSET_CODE(ret, "h"); return (ret); } static __inline int atomic_cmpset_acq_16(volatile uint16_t *_ptr, uint16_t _old, uint16_t _new) { int ret; ATOMIC_CMPSET_CODE(ret, "h"); dmb(); return (ret); } static __inline int atomic_cmpset_rel_16(volatile uint16_t *_ptr, uint16_t _old, uint16_t _new) { int ret; dmb(); ATOMIC_CMPSET_CODE(ret, "h"); return (ret); } static __inline int atomic_cmpset_32(volatile uint32_t *_ptr, uint32_t _old, uint32_t _new) { int ret; ATOMIC_CMPSET_CODE(ret, ""); return (ret); } static __inline int atomic_cmpset_acq_32(volatile uint32_t *_ptr, uint32_t _old, uint32_t _new) { int ret; ATOMIC_CMPSET_CODE(ret, ""); dmb(); return (ret); } static __inline int atomic_cmpset_rel_32(volatile uint32_t *_ptr, uint32_t _old, uint32_t _new) { int ret; dmb(); ATOMIC_CMPSET_CODE(ret, ""); return (ret); } static __inline int atomic_cmpset_long(volatile long *_ptr, long _old, long _new) { int ret; ATOMIC_CMPSET_CODE(ret, ""); return (ret); } static __inline int atomic_cmpset_acq_long(volatile long *_ptr, long _old, long _new) { int ret; ATOMIC_CMPSET_CODE(ret, ""); dmb(); return (ret); } static __inline int atomic_cmpset_rel_long(volatile long *_ptr, long _old, long _new) { int ret; dmb(); ATOMIC_CMPSET_CODE(ret, ""); return (ret); } static __inline int atomic_cmpset_64(volatile uint64_t *_ptr, uint64_t _old, uint64_t _new) { int ret; ATOMIC_CMPSET_CODE64(ret); return (ret); } static __inline int atomic_cmpset_acq_64(volatile uint64_t *_ptr, uint64_t _old, uint64_t _new) { int ret; ATOMIC_CMPSET_CODE64(ret); dmb(); return (ret); } static __inline int atomic_cmpset_rel_64(volatile uint64_t *_ptr, uint64_t _old, uint64_t _new) { int ret; dmb(); ATOMIC_CMPSET_CODE64(ret); return (ret); } static __inline uint32_t atomic_fetchadd_32(volatile uint32_t *p, uint32_t val) { uint32_t tmp = 0, tmp2 = 0, ret = 0; __asm __volatile( "1: ldrex %0, [%3] \n" " add %1, %0, %4 \n" " strex %2, %1, [%3] \n" " cmp %2, #0 \n" " it ne \n" " bne 1b \n" : "+r" (ret), "=&r" (tmp), "+r" (tmp2), "+r" (p), "+r" (val) : : "cc", "memory"); return (ret); } static __inline uint64_t atomic_fetchadd_64(volatile uint64_t *p, uint64_t val) { uint64_t ret, tmp; uint32_t exflag; __asm __volatile( "1: \n" " ldrexd %Q[ret], %R[ret], [%[ptr]] \n" " adds %Q[tmp], %Q[ret], %Q[val] \n" " adc %R[tmp], %R[ret], %R[val] \n" " strexd %[exf], %Q[tmp], %R[tmp], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [ret] "=&r" (ret), [exf] "=&r" (exflag), [tmp] "=&r" (tmp) : [ptr] "r" (p), [val] "r" (val) : "cc", "memory"); return (ret); } static __inline u_long atomic_fetchadd_long(volatile u_long *p, u_long val) { return (atomic_fetchadd_32((volatile uint32_t *)p, val)); } static __inline uint32_t atomic_load_acq_32(volatile uint32_t *p) { uint32_t v; v = *p; dmb(); return (v); } static __inline uint64_t atomic_load_64(volatile uint64_t *p) { uint64_t ret; /* * The only way to atomically load 64 bits is with LDREXD which puts the * exclusive monitor into the exclusive state, so reset it to open state * with CLREX because we don't actually need to store anything. */ __asm __volatile( "ldrexd %Q[ret], %R[ret], [%[ptr]] \n" "clrex \n" : [ret] "=&r" (ret) : [ptr] "r" (p) : "cc", "memory"); return (ret); } static __inline uint64_t atomic_load_acq_64(volatile uint64_t *p) { uint64_t ret; ret = atomic_load_64(p); dmb(); return (ret); } static __inline u_long atomic_load_acq_long(volatile u_long *p) { u_long v; v = *p; dmb(); return (v); } static __inline uint32_t atomic_readandclear_32(volatile uint32_t *p) { uint32_t ret, tmp = 0, tmp2 = 0; __asm __volatile( "1: ldrex %0, [%3] \n" " mov %1, #0 \n" " strex %2, %1, [%3] \n" " cmp %2, #0 \n" " it ne \n" " bne 1b \n" : "=r" (ret), "=&r" (tmp), "+r" (tmp2), "+r" (p) : : "cc", "memory"); return (ret); } static __inline uint64_t atomic_readandclear_64(volatile uint64_t *p) { uint64_t ret, tmp; uint32_t exflag; __asm __volatile( "1: \n" " ldrexd %Q[ret], %R[ret], [%[ptr]] \n" " mov %Q[tmp], #0 \n" " mov %R[tmp], #0 \n" " strexd %[exf], %Q[tmp], %R[tmp], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [ret] "=&r" (ret), [exf] "=&r" (exflag), [tmp] "=&r" (tmp) : [ptr] "r" (p) : "cc", "memory"); return (ret); } static __inline u_long atomic_readandclear_long(volatile u_long *p) { return (atomic_readandclear_32((volatile uint32_t *)p)); } static __inline void atomic_set_32(volatile uint32_t *address, uint32_t setmask) { uint32_t tmp = 0, tmp2 = 0; __asm __volatile( "1: ldrex %0, [%2] \n" " orr %0, %0, %3 \n" " strex %1, %0, [%2] \n" " cmp %1, #0 \n" " it ne \n" " bne 1b \n" : "=&r" (tmp), "+r" (tmp2), "+r" (address), "+r" (setmask) : : "cc", "memory"); } static __inline void atomic_set_64(volatile uint64_t *p, uint64_t val) { uint64_t tmp; uint32_t exflag; __asm __volatile( "1: \n" " ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" " orr %Q[tmp], %Q[val] \n" " orr %R[tmp], %R[val] \n" " strexd %[exf], %Q[tmp], %R[tmp], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [exf] "=&r" (exflag), [tmp] "=&r" (tmp) : [ptr] "r" (p), [val] "r" (val) : "cc", "memory"); } static __inline void atomic_set_long(volatile u_long *address, u_long setmask) { atomic_set_32((volatile uint32_t *)address, setmask); } ATOMIC_ACQ_REL(set, 32) ATOMIC_ACQ_REL(set, 64) ATOMIC_ACQ_REL_LONG(set) static __inline void atomic_subtract_32(volatile uint32_t *p, uint32_t val) { uint32_t tmp = 0, tmp2 = 0; __asm __volatile( "1: ldrex %0, [%2] \n" " sub %0, %0, %3 \n" " strex %1, %0, [%2] \n" " cmp %1, #0 \n" " it ne \n" " bne 1b \n" : "=&r" (tmp), "+r" (tmp2), "+r" (p), "+r" (val) : : "cc", "memory"); } static __inline void atomic_subtract_64(volatile uint64_t *p, uint64_t val) { uint64_t tmp; uint32_t exflag; __asm __volatile( "1: \n" " ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" " subs %Q[tmp], %Q[val] \n" " sbc %R[tmp], %R[tmp], %R[val] \n" " strexd %[exf], %Q[tmp], %R[tmp], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [exf] "=&r" (exflag), [tmp] "=&r" (tmp) : [ptr] "r" (p), [val] "r" (val) : "cc", "memory"); } static __inline void atomic_subtract_long(volatile u_long *p, u_long val) { atomic_subtract_32((volatile uint32_t *)p, val); } ATOMIC_ACQ_REL(subtract, 32) ATOMIC_ACQ_REL(subtract, 64) ATOMIC_ACQ_REL_LONG(subtract) static __inline void atomic_store_64(volatile uint64_t *p, uint64_t val) { uint64_t tmp; uint32_t exflag; /* * The only way to atomically store 64 bits is with STREXD, which will * succeed only if paired up with a preceeding LDREXD using the same * address, so we read and discard the existing value before storing. */ __asm __volatile( "1: \n" " ldrexd %Q[tmp], %R[tmp], [%[ptr]] \n" " strexd %[exf], %Q[val], %R[val], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [tmp] "=&r" (tmp), [exf] "=&r" (exflag) : [ptr] "r" (p), [val] "r" (val) : "cc", "memory"); } static __inline void atomic_store_rel_32(volatile uint32_t *p, uint32_t v) { dmb(); *p = v; } static __inline void atomic_store_rel_64(volatile uint64_t *p, uint64_t val) { dmb(); atomic_store_64(p, val); } static __inline void atomic_store_rel_long(volatile u_long *p, u_long v) { dmb(); *p = v; } static __inline int atomic_testandclear_32(volatile uint32_t *ptr, u_int bit) { int newv, oldv, result; __asm __volatile( " mov ip, #1 \n" " lsl ip, ip, %[bit] \n" /* Done with %[bit] as input, reuse below as output. */ "1: \n" " ldrex %[oldv], [%[ptr]] \n" " bic %[newv], %[oldv], ip \n" " strex %[bit], %[newv], [%[ptr]] \n" " teq %[bit], #0 \n" " it ne \n" " bne 1b \n" " ands %[bit], %[oldv], ip \n" " it ne \n" " movne %[bit], #1 \n" : [bit] "=&r" (result), [oldv] "=&r" (oldv), [newv] "=&r" (newv) : [ptr] "r" (ptr), "[bit]" (bit) : "cc", "ip", "memory"); return (result); } static __inline int atomic_testandclear_int(volatile u_int *p, u_int v) { return (atomic_testandclear_32((volatile uint32_t *)p, v)); } static __inline int atomic_testandclear_long(volatile u_long *p, u_int v) { return (atomic_testandclear_32((volatile uint32_t *)p, v)); } static __inline int atomic_testandset_32(volatile uint32_t *ptr, u_int bit) { int newv, oldv, result; __asm __volatile( " mov ip, #1 \n" " lsl ip, ip, %[bit] \n" /* Done with %[bit] as input, reuse below as output. */ "1: \n" " ldrex %[oldv], [%[ptr]] \n" " orr %[newv], %[oldv], ip \n" " strex %[bit], %[newv], [%[ptr]] \n" " teq %[bit], #0 \n" " it ne \n" " bne 1b \n" " ands %[bit], %[oldv], ip \n" " it ne \n" " movne %[bit], #1 \n" : [bit] "=&r" (result), [oldv] "=&r" (oldv), [newv] "=&r" (newv) : [ptr] "r" (ptr), "[bit]" (bit) : "cc", "ip", "memory"); return (result); } static __inline int atomic_testandset_int(volatile u_int *p, u_int v) { return (atomic_testandset_32((volatile uint32_t *)p, v)); } static __inline int atomic_testandset_long(volatile u_long *p, u_int v) { return (atomic_testandset_32((volatile uint32_t *)p, v)); } static __inline int atomic_testandset_64(volatile uint64_t *p, u_int v) { volatile uint32_t *p32; p32 = (volatile uint32_t *)p; /* Assume little-endian */ if (v >= 32) { v &= 0x1f; p32++; } return (atomic_testandset_32(p32, v)); } static __inline uint32_t atomic_swap_32(volatile uint32_t *p, uint32_t v) { uint32_t ret, exflag; __asm __volatile( "1: ldrex %[ret], [%[ptr]] \n" " strex %[exf], %[val], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [ret] "=&r" (ret), [exf] "=&r" (exflag) : [val] "r" (v), [ptr] "r" (p) : "cc", "memory"); return (ret); } static __inline uint64_t atomic_swap_64(volatile uint64_t *p, uint64_t v) { uint64_t ret; uint32_t exflag; __asm __volatile( "1: ldrexd %Q[ret], %R[ret], [%[ptr]] \n" " strexd %[exf], %Q[val], %R[val], [%[ptr]] \n" " teq %[exf], #0 \n" " it ne \n" " bne 1b \n" : [ret] "=&r" (ret), [exf] "=&r" (exflag) : [val] "r" (v), [ptr] "r" (p) : "cc", "memory"); return (ret); } #undef ATOMIC_ACQ_REL #undef ATOMIC_ACQ_REL_LONG static __inline void atomic_thread_fence_acq(void) { dmb(); } static __inline void atomic_thread_fence_rel(void) { dmb(); } static __inline void atomic_thread_fence_acq_rel(void) { dmb(); } static __inline void atomic_thread_fence_seq_cst(void) { dmb(); } #endif /* _MACHINE_ATOMIC_V6_H_ */