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author | Al Viro <viro@zeniv.linux.org.uk> | 2008-08-18 05:05:42 +0400 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-23 09:55:20 +0400 |
commit | bb8985586b7a906e116db835c64773b7a7d51663 (patch) | |
tree | de93ae58e88cc563d95cc124a73f3930594c6100 /include/asm-x86/atomic_32.h | |
parent | 8ede0bdb63305d3353efd97e9af6210afb05734e (diff) | |
download | linux-bb8985586b7a906e116db835c64773b7a7d51663.tar.xz |
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/asm-x86/atomic_32.h')
-rw-r--r-- | include/asm-x86/atomic_32.h | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/include/asm-x86/atomic_32.h b/include/asm-x86/atomic_32.h deleted file mode 100644 index 14d3f0beb889..000000000000 --- a/include/asm-x86/atomic_32.h +++ /dev/null @@ -1,259 +0,0 @@ -#ifndef ASM_X86__ATOMIC_32_H -#define ASM_X86__ATOMIC_32_H - -#include <linux/compiler.h> -#include <asm/processor.h> -#include <asm/cmpxchg.h> - -/* - * Atomic operations that C can't guarantee us. Useful for - * resource counting etc.. - */ - -/* - * Make sure gcc doesn't try to be clever and move things around - * on us. We need to use _exactly_ the address the user gave us, - * not some alias that contains the same information. - */ -typedef struct { - int counter; -} atomic_t; - -#define ATOMIC_INIT(i) { (i) } - -/** - * atomic_read - read atomic variable - * @v: pointer of type atomic_t - * - * Atomically reads the value of @v. - */ -#define atomic_read(v) ((v)->counter) - -/** - * atomic_set - set atomic variable - * @v: pointer of type atomic_t - * @i: required value - * - * Atomically sets the value of @v to @i. - */ -#define atomic_set(v, i) (((v)->counter) = (i)) - -/** - * atomic_add - add integer to atomic variable - * @i: integer value to add - * @v: pointer of type atomic_t - * - * Atomically adds @i to @v. - */ -static inline void atomic_add(int i, atomic_t *v) -{ - asm volatile(LOCK_PREFIX "addl %1,%0" - : "+m" (v->counter) - : "ir" (i)); -} - -/** - * atomic_sub - subtract integer from atomic variable - * @i: integer value to subtract - * @v: pointer of type atomic_t - * - * Atomically subtracts @i from @v. - */ -static inline void atomic_sub(int i, atomic_t *v) -{ - asm volatile(LOCK_PREFIX "subl %1,%0" - : "+m" (v->counter) - : "ir" (i)); -} - -/** - * atomic_sub_and_test - subtract value from variable and test result - * @i: integer value to subtract - * @v: pointer of type atomic_t - * - * Atomically subtracts @i from @v and returns - * true if the result is zero, or false for all - * other cases. - */ -static inline int atomic_sub_and_test(int i, atomic_t *v) -{ - unsigned char c; - - asm volatile(LOCK_PREFIX "subl %2,%0; sete %1" - : "+m" (v->counter), "=qm" (c) - : "ir" (i) : "memory"); - return c; -} - -/** - * atomic_inc - increment atomic variable - * @v: pointer of type atomic_t - * - * Atomically increments @v by 1. - */ -static inline void atomic_inc(atomic_t *v) -{ - asm volatile(LOCK_PREFIX "incl %0" - : "+m" (v->counter)); -} - -/** - * atomic_dec - decrement atomic variable - * @v: pointer of type atomic_t - * - * Atomically decrements @v by 1. - */ -static inline void atomic_dec(atomic_t *v) -{ - asm volatile(LOCK_PREFIX "decl %0" - : "+m" (v->counter)); -} - -/** - * atomic_dec_and_test - decrement and test - * @v: pointer of type atomic_t - * - * Atomically decrements @v by 1 and - * returns true if the result is 0, or false for all other - * cases. - */ -static inline int atomic_dec_and_test(atomic_t *v) -{ - unsigned char c; - - asm volatile(LOCK_PREFIX "decl %0; sete %1" - : "+m" (v->counter), "=qm" (c) - : : "memory"); - return c != 0; -} - -/** - * atomic_inc_and_test - increment and test - * @v: pointer of type atomic_t - * - * Atomically increments @v by 1 - * and returns true if the result is zero, or false for all - * other cases. - */ -static inline int atomic_inc_and_test(atomic_t *v) -{ - unsigned char c; - - asm volatile(LOCK_PREFIX "incl %0; sete %1" - : "+m" (v->counter), "=qm" (c) - : : "memory"); - return c != 0; -} - -/** - * atomic_add_negative - add and test if negative - * @v: pointer of type atomic_t - * @i: integer value to add - * - * Atomically adds @i to @v and returns true - * if the result is negative, or false when - * result is greater than or equal to zero. - */ -static inline int atomic_add_negative(int i, atomic_t *v) -{ - unsigned char c; - - asm volatile(LOCK_PREFIX "addl %2,%0; sets %1" - : "+m" (v->counter), "=qm" (c) - : "ir" (i) : "memory"); - return c; -} - -/** - * atomic_add_return - add integer and return - * @v: pointer of type atomic_t - * @i: integer value to add - * - * Atomically adds @i to @v and returns @i + @v - */ -static inline int atomic_add_return(int i, atomic_t *v) -{ - int __i; -#ifdef CONFIG_M386 - unsigned long flags; - if (unlikely(boot_cpu_data.x86 <= 3)) - goto no_xadd; -#endif - /* Modern 486+ processor */ - __i = i; - asm volatile(LOCK_PREFIX "xaddl %0, %1" - : "+r" (i), "+m" (v->counter) - : : "memory"); - return i + __i; - -#ifdef CONFIG_M386 -no_xadd: /* Legacy 386 processor */ - local_irq_save(flags); - __i = atomic_read(v); - atomic_set(v, i + __i); - local_irq_restore(flags); - return i + __i; -#endif -} - -/** - * atomic_sub_return - subtract integer and return - * @v: pointer of type atomic_t - * @i: integer value to subtract - * - * Atomically subtracts @i from @v and returns @v - @i - */ -static inline int atomic_sub_return(int i, atomic_t *v) -{ - return atomic_add_return(-i, v); -} - -#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new))) -#define atomic_xchg(v, new) (xchg(&((v)->counter), (new))) - -/** - * atomic_add_unless - add unless the number is already 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 @v was not already @u. - * Returns non-zero if @v was not @u, and zero otherwise. - */ -static inline int atomic_add_unless(atomic_t *v, int a, int u) -{ - int c, old; - c = atomic_read(v); - for (;;) { - if (unlikely(c == (u))) - break; - old = atomic_cmpxchg((v), c, c + (a)); - if (likely(old == c)) - break; - c = old; - } - return c != (u); -} - -#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) - -#define atomic_inc_return(v) (atomic_add_return(1, v)) -#define atomic_dec_return(v) (atomic_sub_return(1, v)) - -/* These are x86-specific, used by some header files */ -#define atomic_clear_mask(mask, addr) \ - asm volatile(LOCK_PREFIX "andl %0,%1" \ - : : "r" (~(mask)), "m" (*(addr)) : "memory") - -#define atomic_set_mask(mask, addr) \ - asm volatile(LOCK_PREFIX "orl %0,%1" \ - : : "r" (mask), "m" (*(addr)) : "memory") - -/* Atomic operations are already serializing on x86 */ -#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_X86__ATOMIC_32_H */ |