190 lines
5.3 KiB
C
190 lines
5.3 KiB
C
/* $NetBSD: atomic.h,v 1.1 2002/10/19 12:22:34 bsh Exp $ */
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/*
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* Copyright (C) 2003-2004 Olivier Houchard
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* Copyright (C) 1994-1997 Mark Brinicombe
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* Copyright (C) 1994 Brini
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of Brini may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ATOMIC_H_
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#define _MACHINE_ATOMIC_H_
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#ifndef _LOCORE
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#include <sys/types.h>
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#ifndef I32_bit
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#define I32_bit (1 << 7) /* IRQ disable */
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#endif
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#ifndef F32_bit
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#define F32_bit (1 << 6) /* FIQ disable */
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#endif
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#define __with_interrupts_disabled(expr) \
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do { \
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u_int cpsr_save, tmp; \
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\
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__asm __volatile( \
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"mrs %0, cpsr;" \
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"orr %1, %0, %2;" \
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"msr cpsr_all, %1;" \
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: "=r" (cpsr_save), "=r" (tmp) \
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: "I" (I32_bit) \
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: "cc" ); \
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(expr); \
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__asm __volatile( \
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"msr cpsr_all, %0" \
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: /* no output */ \
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: "r" (cpsr_save) \
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: "cc" ); \
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} while(0)
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static __inline uint32_t
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__swp(uint32_t val, volatile uint32_t *ptr)
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{
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__asm __volatile("swp %0, %1, [%2]"
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: "=&r" (val) : "r" (val) , "r" (ptr) : "memory");
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return (val);
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}
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#define atomic_op(v, op, p) ({ \
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uint32_t e, r, s; \
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for (e = *(volatile uint32_t *)p;; e = r) { \
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s = e op v; \
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r = __swp(s, p); \
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if (r == e) \
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break; \
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} \
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e; \
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})
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static __inline void
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atomic_set_32(volatile uint32_t *address, uint32_t setmask)
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{
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atomic_op(setmask, |, address);
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}
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static __inline void
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atomic_clear_32(volatile uint32_t *address, uint32_t clearmask)
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{
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atomic_op(clearmask, &~, address);
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}
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static __inline int
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atomic_load_32(volatile uint32_t *v)
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{
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return (atomic_op(0, +, v));
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}
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static __inline void
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atomic_store_32(volatile uint32_t *dst, uint32_t src)
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{
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__swp(src, dst);
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}
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static __inline uint32_t
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atomic_readandclear_32(volatile u_int32_t *p)
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{
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return (__swp(0, p));
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}
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#ifdef _KERNEL
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static __inline u_int32_t
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atomic_cmpset_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval)
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{
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int done;
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__with_interrupts_disabled(
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{
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if (*p == cmpval) {
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*p = newval;
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done = 1;
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} else
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done = 0;
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});
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return (done);
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}
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#endif
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static __inline void
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atomic_add_32(volatile u_int32_t *p, u_int32_t val)
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{
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atomic_op(val, +, p);
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}
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static __inline void
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atomic_subtract_32(volatile u_int32_t *p, u_int32_t val)
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{
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atomic_op(val, -, p);
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}
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#undef __with_interrupts_disabled
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#endif /* _LOCORE */
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#define atomic_set_rel_int atomic_set_32
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#define atomic_set_int atomic_set_32
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#define atomic_readandclear_int atomic_readandclear_32
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#define atomic_clear_int atomic_clear_32
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#define atomic_subtract_int atomic_subtract_32
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#define atomic_subtract_rel_int atomic_subtract_32
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#define atomic_subtract_acq_int atomic_subtract_32
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#define atomic_add_int atomic_add_32
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#define atomic_add_rel_int atomic_add_32
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#define atomic_add_acq_int atomic_add_32
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#define atomic_cmpset_int atomic_cmpset_32
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#define atomic_cmpset_rel_int atomic_cmpset_32
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#define atomic_cmpset_rel_ptr atomic_cmpset_ptr
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#define atomic_cmpset_acq_int atomic_cmpset_32
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#define atomic_cmpset_acq_ptr atomic_cmpset_ptr
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#define atomic_store_rel_ptr atomic_store_ptr
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#define atomic_store_rel_int atomic_store_32
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#define atomic_cmpset_rel_32 atomic_cmpset_32
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#define atomic_smpset_rel_ptr atomic_cmpset_ptr
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#define atomic_load_acq_int atomic_load_32
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#define atomic_clear_ptr(ptr, bit) atomic_clear_32( \
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(volatile uint32_t *)ptr, (uint32_t)bit)
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#define atomic_store_ptr(ptr, bit) atomic_store_32( \
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(volatile uint32_t *)ptr, (uint32_t)bit)
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#define atomic_cmpset_ptr(dst, exp, s) atomic_cmpset_32( \
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(volatile uint32_t *)dst, (uint32_t)exp, (uint32_t)s)
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#define atomic_set_ptr(ptr, src) atomic_set_32( \
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(volatile uint32_t *)ptr, (uint32_t)src)
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#endif /* _MACHINE_ATOMIC_H_ */
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