200 lines
4.8 KiB
C
200 lines
4.8 KiB
C
/* atomic.h: atomic operation emulation for FR-V
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*
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* For an explanation of how atomic ops work in this arch, see:
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* Documentation/frv/atomic-ops.txt
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_ATOMIC_H
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#define _ASM_ATOMIC_H
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#include <linux/types.h>
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#include <asm/spr-regs.h>
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#include <asm/cmpxchg.h>
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#include <asm/barrier.h>
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#ifdef CONFIG_SMP
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#error not SMP safe
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#endif
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*
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* We do not have SMP systems, so we don't have to deal with that.
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*/
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#define ATOMIC_INIT(i) { (i) }
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#define atomic_read(v) ACCESS_ONCE((v)->counter)
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#define atomic_set(v, i) (((v)->counter) = (i))
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#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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unsigned long val;
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asm("0: \n"
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" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
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" ckeq icc3,cc7 \n"
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" ld.p %M0,%1 \n" /* LD.P/ORCR must be atomic */
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" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
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" add%I2 %1,%2,%1 \n"
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" cst.p %1,%M0 ,cc3,#1 \n"
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" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* clear ICC3.Z if store happens */
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" beq icc3,#0,0b \n"
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: "+U"(v->counter), "=&r"(val)
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: "NPr"(i)
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: "memory", "cc7", "cc3", "icc3"
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);
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return val;
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}
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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unsigned long val;
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asm("0: \n"
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" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
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" ckeq icc3,cc7 \n"
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" ld.p %M0,%1 \n" /* LD.P/ORCR must be atomic */
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" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
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" sub%I2 %1,%2,%1 \n"
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" cst.p %1,%M0 ,cc3,#1 \n"
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" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* clear ICC3.Z if store happens */
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" beq icc3,#0,0b \n"
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: "+U"(v->counter), "=&r"(val)
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: "NPr"(i)
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: "memory", "cc7", "cc3", "icc3"
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);
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return val;
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}
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#else
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extern int atomic_add_return(int i, atomic_t *v);
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extern int atomic_sub_return(int i, atomic_t *v);
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#endif
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static inline int atomic_add_negative(int i, atomic_t *v)
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{
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return atomic_add_return(i, v) < 0;
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}
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static inline void atomic_add(int i, atomic_t *v)
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{
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atomic_add_return(i, v);
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}
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static inline void atomic_sub(int i, atomic_t *v)
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{
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atomic_sub_return(i, v);
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}
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static inline void atomic_inc(atomic_t *v)
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{
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atomic_add_return(1, v);
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}
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static inline void atomic_dec(atomic_t *v)
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{
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atomic_sub_return(1, v);
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}
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#define atomic_dec_return(v) atomic_sub_return(1, (v))
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#define atomic_inc_return(v) atomic_add_return(1, (v))
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#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
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#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
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#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
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/*
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* 64-bit atomic ops
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*/
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typedef struct {
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volatile long long counter;
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} atomic64_t;
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#define ATOMIC64_INIT(i) { (i) }
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static inline long long atomic64_read(atomic64_t *v)
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{
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long long counter;
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asm("ldd%I1 %M1,%0"
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: "=e"(counter)
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: "m"(v->counter));
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return counter;
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}
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static inline void atomic64_set(atomic64_t *v, long long i)
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{
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asm volatile("std%I0 %1,%M0"
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: "=m"(v->counter)
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: "e"(i));
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}
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extern long long atomic64_inc_return(atomic64_t *v);
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extern long long atomic64_dec_return(atomic64_t *v);
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extern long long atomic64_add_return(long long i, atomic64_t *v);
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extern long long atomic64_sub_return(long long i, atomic64_t *v);
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static inline long long atomic64_add_negative(long long i, atomic64_t *v)
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{
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return atomic64_add_return(i, v) < 0;
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}
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static inline void atomic64_add(long long i, atomic64_t *v)
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{
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atomic64_add_return(i, v);
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}
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static inline void atomic64_sub(long long i, atomic64_t *v)
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{
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atomic64_sub_return(i, v);
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}
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static inline void atomic64_inc(atomic64_t *v)
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{
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atomic64_inc_return(v);
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}
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static inline void atomic64_dec(atomic64_t *v)
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{
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atomic64_dec_return(v);
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}
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#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
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#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
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#define atomic64_inc_and_test(v) (atomic64_inc_return((v)) == 0)
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#define atomic_cmpxchg(v, old, new) (cmpxchg(&(v)->counter, old, new))
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#define atomic_xchg(v, new) (xchg(&(v)->counter, new))
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#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
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#define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter))
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static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
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{
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int c, old;
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c = atomic_read(v);
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for (;;) {
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if (unlikely(c == (u)))
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break;
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old = atomic_cmpxchg((v), c, c + (a));
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if (likely(old == c))
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break;
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c = old;
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}
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return c;
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}
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#endif /* _ASM_ATOMIC_H */
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