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102 lines
2.6 KiB
102 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ALPHA_LOCAL_H |
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#define _ALPHA_LOCAL_H |
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#include <linux/percpu.h> |
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#include <linux/atomic.h> |
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typedef struct |
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{ |
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atomic_long_t a; |
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} local_t; |
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#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } |
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#define local_read(l) atomic_long_read(&(l)->a) |
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#define local_set(l,i) atomic_long_set(&(l)->a, (i)) |
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#define local_inc(l) atomic_long_inc(&(l)->a) |
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#define local_dec(l) atomic_long_dec(&(l)->a) |
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#define local_add(i,l) atomic_long_add((i),(&(l)->a)) |
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#define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) |
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static __inline__ long local_add_return(long i, local_t * l) |
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{ |
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long temp, result; |
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__asm__ __volatile__( |
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"1: ldq_l %0,%1\n" |
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" addq %0,%3,%2\n" |
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" addq %0,%3,%0\n" |
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" stq_c %0,%1\n" |
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" beq %0,2f\n" |
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".subsection 2\n" |
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"2: br 1b\n" |
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".previous" |
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:"=&r" (temp), "=m" (l->a.counter), "=&r" (result) |
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:"Ir" (i), "m" (l->a.counter) : "memory"); |
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return result; |
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} |
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static __inline__ long local_sub_return(long i, local_t * l) |
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{ |
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long temp, result; |
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__asm__ __volatile__( |
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"1: ldq_l %0,%1\n" |
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" subq %0,%3,%2\n" |
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" subq %0,%3,%0\n" |
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" stq_c %0,%1\n" |
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" beq %0,2f\n" |
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".subsection 2\n" |
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"2: br 1b\n" |
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".previous" |
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:"=&r" (temp), "=m" (l->a.counter), "=&r" (result) |
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:"Ir" (i), "m" (l->a.counter) : "memory"); |
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return result; |
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} |
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#define local_cmpxchg(l, o, n) \ |
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(cmpxchg_local(&((l)->a.counter), (o), (n))) |
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#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n))) |
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/** |
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* local_add_unless - add unless the number is a given value |
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* @l: pointer of type local_t |
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* @a: the amount to add to l... |
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* @u: ...unless l is equal to u. |
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* |
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* Atomically adds @a to @l, so long as it was not @u. |
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* Returns non-zero if @l was not @u, and zero otherwise. |
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*/ |
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#define local_add_unless(l, a, u) \ |
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({ \ |
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long c, old; \ |
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c = local_read(l); \ |
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for (;;) { \ |
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if (unlikely(c == (u))) \ |
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break; \ |
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old = local_cmpxchg((l), 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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c != (u); \ |
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}) |
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#define local_inc_not_zero(l) local_add_unless((l), 1, 0) |
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#define local_add_negative(a, l) (local_add_return((a), (l)) < 0) |
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#define local_dec_return(l) local_sub_return(1,(l)) |
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#define local_inc_return(l) local_add_return(1,(l)) |
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#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0) |
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#define local_inc_and_test(l) (local_add_return(1, (l)) == 0) |
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#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) |
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/* Verify if faster than atomic ops */ |
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#define __local_inc(l) ((l)->a.counter++) |
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#define __local_dec(l) ((l)->a.counter++) |
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#define __local_add(i,l) ((l)->a.counter+=(i)) |
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#define __local_sub(i,l) ((l)->a.counter-=(i)) |
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#endif /* _ALPHA_LOCAL_H */
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