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Diffstat (limited to 'arch/avr32/include/asm/atomic.h')
| -rw-r--r-- | arch/avr32/include/asm/atomic.h | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/arch/avr32/include/asm/atomic.h b/arch/avr32/include/asm/atomic.h deleted file mode 100644 index 3d5ce38a6f0b..000000000000 --- a/arch/avr32/include/asm/atomic.h +++ /dev/null @@ -1,243 +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 <linux/types.h> -#include <asm/cmpxchg.h> - -#define ATOMIC_INIT(i) { (i) } - -#define atomic_read(v) READ_ONCE((v)->counter) -#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) - -#define ATOMIC_OP_RETURN(op, asm_op, asm_con) \ -static inline int __atomic_##op##_return(int i, atomic_t *v) \ -{ \ - int result; \ - \ - asm volatile( \ - "/* atomic_" #op "_return */\n" \ - "1: ssrf 5\n" \ - " ld.w %0, %2\n" \ - " " #asm_op " %0, %3\n" \ - " stcond %1, %0\n" \ - " brne 1b" \ - : "=&r" (result), "=o" (v->counter) \ - : "m" (v->counter), #asm_con (i) \ - : "cc"); \ - \ - return result; \ -} - -#define ATOMIC_FETCH_OP(op, asm_op, asm_con) \ -static inline int __atomic_fetch_##op(int i, atomic_t *v) \ -{ \ - int result, val; \ - \ - asm volatile( \ - "/* atomic_fetch_" #op " */\n" \ - "1: ssrf 5\n" \ - " ld.w %0, %3\n" \ - " mov %1, %0\n" \ - " " #asm_op " %1, %4\n" \ - " stcond %2, %1\n" \ - " brne 1b" \ - : "=&r" (result), "=&r" (val), "=o" (v->counter) \ - : "m" (v->counter), #asm_con (i) \ - : "cc"); \ - \ - return result; \ -} - -ATOMIC_OP_RETURN(sub, sub, rKs21) -ATOMIC_OP_RETURN(add, add, r) -ATOMIC_FETCH_OP (sub, sub, rKs21) -ATOMIC_FETCH_OP (add, add, r) - -#define ATOMIC_OPS(op, asm_op) \ -ATOMIC_OP_RETURN(op, asm_op, r) \ -static inline void atomic_##op(int i, atomic_t *v) \ -{ \ - (void)__atomic_##op##_return(i, v); \ -} \ -ATOMIC_FETCH_OP(op, asm_op, r) \ -static inline int atomic_fetch_##op(int i, atomic_t *v) \ -{ \ - return __atomic_fetch_##op(i, v); \ -} - -ATOMIC_OPS(and, and) -ATOMIC_OPS(or, or) -ATOMIC_OPS(xor, eor) - -#undef ATOMIC_OPS -#undef ATOMIC_FETCH_OP -#undef ATOMIC_OP_RETURN - -/* - * Probably found the reason why we want to use sub with the signed 21-bit - * limit, it uses one less register than the add instruction that can add up to - * 32-bit values. - * - * Both instructions are 32-bit, to use a 16-bit instruction the immediate is - * very small; 4 bit. - * - * sub 32-bit, type IV, takes a register and subtracts a 21-bit immediate. - * add 32-bit, type II, adds two register values together. - */ -#define IS_21BIT_CONST(i) \ - (__builtin_constant_p(i) && ((i) >= -1048575) && ((i) <= 1048576)) - -/* - * 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) -{ - if (IS_21BIT_CONST(i)) - return __atomic_sub_return(-i, v); - - return __atomic_add_return(i, v); -} - -static inline int atomic_fetch_add(int i, atomic_t *v) -{ - if (IS_21BIT_CONST(i)) - return __atomic_fetch_sub(-i, v); - - return __atomic_fetch_add(i, v); -} - -/* - * 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) -{ - if (IS_21BIT_CONST(i)) - return __atomic_sub_return(i, v); - - return __atomic_add_return(-i, v); -} - -static inline int atomic_fetch_sub(int i, atomic_t *v) -{ - if (IS_21BIT_CONST(i)) - return __atomic_fetch_sub(i, v); - - return __atomic_fetch_add(-i, v); -} - -/* - * __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. - * - * Atomically adds @a to @v, so long as it was not @u. - * Returns the old value of @v. -*/ -static inline int __atomic_add_unless(atomic_t *v, int a, int u) -{ - int tmp, old = atomic_read(v); - - if (IS_21BIT_CONST(a)) { - asm volatile( - "/* __atomic_sub_unless */\n" - "1: ssrf 5\n" - " ld.w %0, %2\n" - " cp.w %0, %4\n" - " breq 1f\n" - " sub %0, %3\n" - " stcond %1, %0\n" - " brne 1b\n" - "1:" - : "=&r"(tmp), "=o"(v->counter) - : "m"(v->counter), "rKs21"(-a), "rKs21"(u) - : "cc", "memory"); - } else { - asm volatile( - "/* __atomic_add_unless */\n" - "1: ssrf 5\n" - " ld.w %0, %2\n" - " cp.w %0, %4\n" - " breq 1f\n" - " add %0, %3\n" - " stcond %1, %0\n" - " brne 1b\n" - "1:" - : "=&r"(tmp), "=o"(v->counter) - : "m"(v->counter), "r"(a), "ir"(u) - : "cc", "memory"); - } - - return old; -} - -#undef IS_21BIT_CONST - -/* - * 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_dec_if_positive(v) atomic_sub_if_positive(1, v) - -#endif /* __ASM_AVR32_ATOMIC_H */ |