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Diffstat (limited to 'include/asm-avr32/atomic.h')
| -rw-r--r-- | include/asm-avr32/atomic.h | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/include/asm-avr32/atomic.h b/include/asm-avr32/atomic.h deleted file mode 100644 index 7ef3862..0000000 --- a/include/asm-avr32/atomic.h +++ /dev/null @@ -1,201 +0,0 @@ -/* - * Atomic operations that C can't guarantee us. Useful for - * resource counting etc. - * - * But use these as seldom as possible since they are slower than - * regular operations. - * - * Copyright (C) 2004-2006 Atmel Corporation - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#ifndef __ASM_AVR32_ATOMIC_H -#define __ASM_AVR32_ATOMIC_H - -#include <asm/system.h> - -typedef struct { volatile int counter; } atomic_t; -#define ATOMIC_INIT(i) { (i) } - -#define atomic_read(v) ((v)->counter) -#define atomic_set(v, i) (((v)->counter) = i) - -/* - * atomic_sub_return - subtract the atomic variable - * @i: integer value to subtract - * @v: pointer of type atomic_t - * - * Atomically subtracts @i from @v. Returns the resulting value. - */ -static inline int atomic_sub_return(int i, atomic_t *v) -{ - int result; - - asm volatile( - "/* atomic_sub_return */\n" - "1: ssrf 5\n" - " ld.w %0, %2\n" - " sub %0, %3\n" - " stcond %1, %0\n" - " brne 1b" - : "=&r"(result), "=o"(v->counter) - : "m"(v->counter), "rKs21"(i) - : "cc"); - - return result; -} - -/* - * atomic_add_return - add integer to atomic variable - * @i: integer value to add - * @v: pointer of type atomic_t - * - * Atomically adds @i to @v. Returns the resulting value. - */ -static inline int atomic_add_return(int i, atomic_t *v) -{ - int result; - - if (__builtin_constant_p(i) && (i >= -1048575) && (i <= 1048576)) - result = atomic_sub_return(-i, v); - else - asm volatile( - "/* atomic_add_return */\n" - "1: ssrf 5\n" - " ld.w %0, %1\n" - " add %0, %3\n" - " stcond %2, %0\n" - " brne 1b" - : "=&r"(result), "=o"(v->counter) - : "m"(v->counter), "r"(i) - : "cc", "memory"); - - return result; -} - -/* - * atomic_sub_unless - sub unless the number is a given value - * @v: pointer of type atomic_t - * @a: the amount to add to v... - * @u: ...unless v is equal to u. - * - * If the atomic value v is not equal to u, this function subtracts a - * from v, and returns non zero. If v is equal to u then it returns - * zero. This is done as an atomic operation. -*/ -static inline int atomic_sub_unless(atomic_t *v, int a, int u) -{ - int tmp, result = 0; - - asm volatile( - "/* atomic_sub_unless */\n" - "1: ssrf 5\n" - " ld.w %0, %3\n" - " cp.w %0, %5\n" - " breq 1f\n" - " sub %0, %4\n" - " stcond %2, %0\n" - " brne 1b\n" - " mov %1, 1\n" - "1:" - : "=&r"(tmp), "=&r"(result), "=o"(v->counter) - : "m"(v->counter), "rKs21"(a), "rKs21"(u), "1"(result) - : "cc", "memory"); - - return result; -} - -/* - * atomic_add_unless - add unless the number is a given value - * @v: pointer of type atomic_t - * @a: the amount to add to v... - * @u: ...unless v is equal to u. - * - * If the atomic value v is not equal to u, this function adds a to v, - * and returns non zero. If v is equal to u then it returns zero. This - * is done as an atomic operation. -*/ -static inline int atomic_add_unless(atomic_t *v, int a, int u) -{ - int tmp, result; - - if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576)) - result = atomic_sub_unless(v, -a, u); - else { - result = 0; - asm volatile( - "/* atomic_add_unless */\n" - "1: ssrf 5\n" - " ld.w %0, %3\n" - " cp.w %0, %5\n" - " breq 1f\n" - " add %0, %4\n" - " stcond %2, %0\n" - " brne 1b\n" - " mov %1, 1\n" - "1:" - : "=&r"(tmp), "=&r"(result), "=o"(v->counter) - : "m"(v->counter), "r"(a), "ir"(u), "1"(result) - : "cc", "memory"); - } - - return result; -} - -/* - * atomic_sub_if_positive - conditionally subtract integer from atomic variable - * @i: integer value to subtract - * @v: pointer of type atomic_t - * - * Atomically test @v and subtract @i if @v is greater or equal than @i. - * The function returns the old value of @v minus @i. - */ -static inline int atomic_sub_if_positive(int i, atomic_t *v) -{ - int result; - - asm volatile( - "/* atomic_sub_if_positive */\n" - "1: ssrf 5\n" - " ld.w %0, %2\n" - " sub %0, %3\n" - " brlt 1f\n" - " stcond %1, %0\n" - " brne 1b\n" - "1:" - : "=&r"(result), "=o"(v->counter) - : "m"(v->counter), "ir"(i) - : "cc", "memory"); - - return result; -} - -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) -#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) - -#define atomic_sub(i, v) (void)atomic_sub_return(i, v) -#define atomic_add(i, v) (void)atomic_add_return(i, v) -#define atomic_dec(v) atomic_sub(1, (v)) -#define atomic_inc(v) atomic_add(1, (v)) - -#define atomic_dec_return(v) atomic_sub_return(1, v) -#define atomic_inc_return(v) atomic_add_return(1, v) - -#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) -#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0) -#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0) -#define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0) - -#define atomic_inc_not_zero(v) atomic_add_unless(v, 1, 0) -#define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v) - -#define smp_mb__before_atomic_dec() barrier() -#define smp_mb__after_atomic_dec() barrier() -#define smp_mb__before_atomic_inc() barrier() -#define smp_mb__after_atomic_inc() barrier() - -#include <asm-generic/atomic.h> - -#endif /* __ASM_AVR32_ATOMIC_H */ |
