atomic.h revision 147555
1/* $NetBSD: atomic.h,v 1.1 2002/10/19 12:22:34 bsh Exp $ */ 2 3/*- 4 * Copyright (C) 2003-2004 Olivier Houchard 5 * Copyright (C) 1994-1997 Mark Brinicombe 6 * Copyright (C) 1994 Brini 7 * All rights reserved. 8 * 9 * This code is derived from software written for Brini by Mark Brinicombe 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by Brini. 22 * 4. The name of Brini may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL BRINI BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 * 36 * $FreeBSD: head/sys/arm/include/atomic.h 147555 2005-06-23 21:54:17Z jhb $ 37 */ 38 39#ifndef _MACHINE_ATOMIC_H_ 40#define _MACHINE_ATOMIC_H_ 41 42 43 44#ifndef _LOCORE 45 46#include <sys/types.h> 47 48#ifndef I32_bit 49#define I32_bit (1 << 7) /* IRQ disable */ 50#endif 51#ifndef F32_bit 52#define F32_bit (1 << 6) /* FIQ disable */ 53#endif 54 55#define __with_interrupts_disabled(expr) \ 56 do { \ 57 u_int cpsr_save, tmp; \ 58 \ 59 __asm __volatile( \ 60 "mrs %0, cpsr;" \ 61 "orr %1, %0, %2;" \ 62 "msr cpsr_all, %1;" \ 63 : "=r" (cpsr_save), "=r" (tmp) \ 64 : "I" (I32_bit) \ 65 : "cc" ); \ 66 (expr); \ 67 __asm __volatile( \ 68 "msr cpsr_all, %0" \ 69 : /* no output */ \ 70 : "r" (cpsr_save) \ 71 : "cc" ); \ 72 } while(0) 73 74#define ARM_RAS_START 0xe0000004 75#define ARM_RAS_END 0xe0000008 76 77static __inline uint32_t 78__swp(uint32_t val, volatile uint32_t *ptr) 79{ 80 __asm __volatile("swp %0, %1, [%2]" 81 : "=&r" (val) : "r" (val) , "r" (ptr) : "memory"); 82 return (val); 83} 84 85 86#ifdef _KERNEL 87static __inline void 88atomic_set_32(volatile uint32_t *address, uint32_t setmask) 89{ 90 __with_interrupts_disabled(*address |= setmask); 91} 92 93static __inline void 94atomic_clear_32(volatile uint32_t *address, uint32_t clearmask) 95{ 96 __with_interrupts_disabled(*address &= ~clearmask); 97} 98 99static __inline u_int32_t 100atomic_cmpset_32(volatile u_int32_t *p, volatile u_int32_t cmpval, volatile u_int32_t newval) 101{ 102 int ret; 103 104 __with_interrupts_disabled( 105 { 106 if (*p == cmpval) { 107 *p = newval; 108 ret = 1; 109 } else { 110 ret = 0; 111 } 112 }); 113 return (ret); 114} 115 116static __inline void 117atomic_add_32(volatile u_int32_t *p, u_int32_t val) 118{ 119 __with_interrupts_disabled(*p += val); 120} 121 122static __inline void 123atomic_subtract_32(volatile u_int32_t *p, u_int32_t val) 124{ 125 __with_interrupts_disabled(*p -= val); 126} 127 128#else /* !_KERNEL */ 129 130static __inline u_int32_t 131atomic_cmpset_32(volatile u_int32_t *p, volatile u_int32_t cmpval, volatile u_int32_t newval) 132{ 133 register int done, ras_start; 134 135 __asm __volatile("1:\n" 136 "mov %0, #0xe0000008\n" 137 "adr %1, 2f\n" 138 "str %1, [%0]\n" 139 "adr %1, 1b\n" 140 "mov %0, #0xe0000004\n" 141 "str %1, [%0]\n" 142 "ldr %1, [%2]\n" 143 "cmp %1, %3\n" 144 "streq %4, [%2]\n" 145 "2:\n" 146 "mov %1, #0\n" 147 "str %1, [%0]\n" 148 "moveq %1, #1\n" 149 "movne %1, #0\n" 150 : "=r" (ras_start), "=r" (done) 151 ,"+r" (p), "+r" (cmpval), "+r" (newval)); 152 return (done); 153} 154 155static __inline void 156atomic_add_32(volatile u_int32_t *p, u_int32_t val) 157{ 158 int ras_start, start; 159 160 __asm __volatile("1:\n" 161 "mov %0, #0xe0000008\n" 162 "adr %1, 2f\n" 163 "str %1, [%0]\n" 164 "adr %1, 1b\n" 165 "mov %0, #0xe0000004\n" 166 "str %1, [%0]\n" 167 "ldr %1, [%2]\n" 168 "add %1, %1, %3\n" 169 "str %1, [%2]\n" 170 "2:\n" 171 "mov %1, #0\n" 172 "str %1, [%0]\n" 173 : "=r" (ras_start), "=r" (start), "+r" (p), "+r" (val)); 174} 175 176static __inline void 177atomic_subtract_32(volatile u_int32_t *p, u_int32_t val) 178{ 179 int ras_start, start; 180 181 __asm __volatile("1:\n" 182 "mov %0, #0xe0000008\n" 183 "adr %1, 2f\n" 184 "str %1, [%0]\n" 185 "adr %1, 1b\n" 186 "mov %0, #0xe0000004\n" 187 "str %1, [%0]\n" 188 "ldr %1, [%2]\n" 189 "sub %1, %1, %3\n" 190 "str %1, [%2]\n" 191 "2:\n" 192 "mov %1, #0\n" 193 "str %1, [%0]\n" 194 195 : "=r" (ras_start), "=r" (start), "+r" (p), "+r" (val)); 196} 197 198static __inline void 199atomic_set_32(volatile uint32_t *address, uint32_t setmask) 200{ 201 int ras_start, start; 202 203 __asm __volatile("1:\n" 204 "mov %0, #0xe0000008\n" 205 "adr %1, 2f\n" 206 "str %1, [%0]\n" 207 "adr %1, 1b\n" 208 "mov %0, #0xe0000004\n" 209 "str %1, [%0]\n" 210 "ldr %1, [%2]\n" 211 "orr %1, %1, %3\n" 212 "str %1, [%2]\n" 213 "2:\n" 214 "mov %1, #0\n" 215 "str %1, [%0]\n" 216 217 : "=r" (ras_start), "=r" (start), "+r" (address), "+r" (setmask)); 218} 219 220static __inline void 221atomic_clear_32(volatile uint32_t *address, uint32_t clearmask) 222{ 223 int ras_start, start; 224 225 __asm __volatile("1:\n" 226 "mov %0, #0xe0000008\n" 227 "adr %1, 2f\n" 228 "str %1, [%0]\n" 229 "adr %1, 1b\n" 230 "mov %0, #0xe0000004\n" 231 "str %1, [%0]\n" 232 "ldr %1, [%2]\n" 233 "bic %1, %1, %3\n" 234 "str %1, [%2]\n" 235 "2:\n" 236 "mov %1, #0\n" 237 "str %1, [%0]\n" 238 : "=r" (ras_start), "=r" (start), "+r" (address), "+r" (clearmask)); 239 240} 241#endif /* _KERNEL */ 242 243static __inline int 244atomic_load_32(volatile uint32_t *v) 245{ 246 247 return (*v); 248} 249 250static __inline void 251atomic_store_32(volatile uint32_t *dst, uint32_t src) 252{ 253 *dst = src; 254} 255 256static __inline uint32_t 257atomic_readandclear_32(volatile u_int32_t *p) 258{ 259 260 return (__swp(0, p)); 261} 262 263#undef __with_interrupts_disabled 264 265#endif /* _LOCORE */ 266 267 268#define atomic_set_rel_int atomic_set_32 269#define atomic_set_int atomic_set_32 270#define atomic_readandclear_int atomic_readandclear_32 271#define atomic_clear_int atomic_clear_32 272#define atomic_subtract_int atomic_subtract_32 273#define atomic_subtract_rel_int atomic_subtract_32 274#define atomic_subtract_acq_int atomic_subtract_32 275#define atomic_add_int atomic_add_32 276#define atomic_add_rel_int atomic_add_32 277#define atomic_add_acq_int atomic_add_32 278#define atomic_cmpset_int atomic_cmpset_32 279#define atomic_cmpset_rel_int atomic_cmpset_32 280#define atomic_cmpset_rel_ptr atomic_cmpset_ptr 281#define atomic_cmpset_acq_int atomic_cmpset_32 282#define atomic_cmpset_acq_ptr atomic_cmpset_ptr 283#define atomic_store_rel_ptr atomic_store_ptr 284#define atomic_store_rel_int atomic_store_32 285#define atomic_cmpset_rel_32 atomic_cmpset_32 286#define atomic_cmpset_rel_ptr atomic_cmpset_ptr 287#define atomic_load_acq_int atomic_load_32 288#define atomic_clear_ptr(ptr, bit) atomic_clear_32( \ 289 (volatile uint32_t *)ptr, (uint32_t)bit) 290#define atomic_store_ptr(ptr, bit) atomic_store_32( \ 291 (volatile uint32_t *)ptr, (uint32_t)bit) 292#define atomic_cmpset_ptr(dst, exp, s) atomic_cmpset_32( \ 293 (volatile uint32_t *)dst, (uint32_t)exp, (uint32_t)s) 294#define atomic_set_ptr(ptr, src) atomic_set_32( \ 295 (volatile uint32_t *)ptr, (uint32_t)src) 296 297#endif /* _MACHINE_ATOMIC_H_ */ 298