1 /* $NetBSD: atomic.h,v 1.5 2005/12/28 19:09:29 perry Exp $ */ 2 3 /* 4 * Copyright (C) 1994-1997 Mark Brinicombe 5 * Copyright (C) 1994 Brini 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Brini. 21 * 4. The name of Brini may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL BRINI BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #ifndef _ARM_ATOMIC_H_ 37 #define _ARM_ATOMIC_H_ 38 39 #ifndef ATOMIC_SET_BIT_NONINLINE_REQUIRED 40 41 #if defined(__PROG26) || defined(ATOMIC_SET_BIT_NOINLINE) 42 #define ATOMIC_SET_BIT_NONINLINE_REQUIRED 43 #endif 44 45 #endif /* ATOMIC_SET_BIT_NONINLINE_REQUIRED */ 46 47 48 #ifndef _LOCORE 49 50 #include <sys/types.h> 51 #include <arm/armreg.h> /* I32_bit */ 52 53 #ifdef ATOMIC_SET_BIT_NONINLINE_REQUIRED 54 void atomic_set_bit( u_int *, u_int ); 55 void atomic_clear_bit( u_int *, u_int ); 56 #endif 57 58 #ifdef __PROG32 59 #define __with_interrupts_disabled(expr) \ 60 do { \ 61 u_int cpsr_save, tmp; \ 62 \ 63 __asm volatile( \ 64 "mrs %0, cpsr;" \ 65 "orr %1, %0, %2;" \ 66 "msr cpsr_all, %1;" \ 67 : "=r" (cpsr_save), "=r" (tmp) \ 68 : "I" (I32_bit) \ 69 : "cc" ); \ 70 (expr); \ 71 __asm volatile( \ 72 "msr cpsr_all, %0" \ 73 : /* no output */ \ 74 : "r" (cpsr_save) \ 75 : "cc" ); \ 76 } while(0) 77 78 static __inline void 79 inline_atomic_set_bit( u_int *address, u_int setmask ) 80 { 81 __with_interrupts_disabled( *address |= setmask ); 82 } 83 84 static __inline void 85 inline_atomic_clear_bit( u_int *address, u_int clearmask ) 86 { 87 __with_interrupts_disabled( *address &= ~clearmask ); 88 } 89 90 #if !defined(ATOMIC_SET_BIT_NOINLINE) 91 92 #define atomic_set_bit(a,m) inline_atomic_set_bit(a,m) 93 #define atomic_clear_bit(a,m) inline_atomic_clear_bit(a,m) 94 95 #endif 96 97 #endif /* __PROG32 */ 98 99 #undef __with_interrupts_disabled 100 101 #endif /* _LOCORE */ 102 #endif /* _ARM_ATOMIC_H_ */ 103
