diff options
Diffstat (limited to 'include/asm-sparc/atomic.h')
| -rw-r--r-- | include/asm-sparc/atomic.h | 169 |
1 files changed, 6 insertions, 163 deletions
diff --git a/include/asm-sparc/atomic.h b/include/asm-sparc/atomic.h index 5c944b5a8040..66d8166ec1d7 100644 --- a/include/asm-sparc/atomic.h +++ b/include/asm-sparc/atomic.h @@ -1,165 +1,8 @@ -/* atomic.h: These still suck, but the I-cache hit rate is higher. - * - * Copyright (C) 1996 David S. Miller (davem@davemloft.net) - * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com.au) - * Copyright (C) 2007 Kyle McMartin (kyle@parisc-linux.org) - * - * Additions by Keith M Wesolowski (wesolows@foobazco.org) based - * on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>. - */ - -#ifndef __ARCH_SPARC_ATOMIC__ -#define __ARCH_SPARC_ATOMIC__ - -#include <linux/types.h> - -typedef struct { volatile int counter; } atomic_t; - -#ifdef __KERNEL__ - -#define ATOMIC_INIT(i) { (i) } - -extern int __atomic_add_return(int, atomic_t *); -extern int atomic_cmpxchg(atomic_t *, int, int); -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) -extern int atomic_add_unless(atomic_t *, int, int); -extern void atomic_set(atomic_t *, int); - -#define atomic_read(v) ((v)->counter) - -#define atomic_add(i, v) ((void)__atomic_add_return( (int)(i), (v))) -#define atomic_sub(i, v) ((void)__atomic_add_return(-(int)(i), (v))) -#define atomic_inc(v) ((void)__atomic_add_return( 1, (v))) -#define atomic_dec(v) ((void)__atomic_add_return( -1, (v))) - -#define atomic_add_return(i, v) (__atomic_add_return( (int)(i), (v))) -#define atomic_sub_return(i, v) (__atomic_add_return(-(int)(i), (v))) -#define atomic_inc_return(v) (__atomic_add_return( 1, (v))) -#define atomic_dec_return(v) (__atomic_add_return( -1, (v))) - -#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 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. - */ -#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) - -#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) -#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) - -#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) - -/* This is the old 24-bit implementation. It's still used internally - * by some sparc-specific code, notably the semaphore implementation. - */ -typedef struct { volatile int counter; } atomic24_t; - -#ifndef CONFIG_SMP - -#define ATOMIC24_INIT(i) { (i) } -#define atomic24_read(v) ((v)->counter) -#define atomic24_set(v, i) (((v)->counter) = i) - +#ifndef ___ASM_SPARC_ATOMIC_H +#define ___ASM_SPARC_ATOMIC_H +#if defined(__sparc__) && defined(__arch64__) +#include <asm-sparc/atomic_64.h> #else -/* We do the bulk of the actual work out of line in two common - * routines in assembler, see arch/sparc/lib/atomic.S for the - * "fun" details. - * - * For SMP the trick is you embed the spin lock byte within - * the word, use the low byte so signedness is easily retained - * via a quick arithmetic shift. It looks like this: - * - * ---------------------------------------- - * | signed 24-bit counter value | lock | atomic_t - * ---------------------------------------- - * 31 8 7 0 - */ - -#define ATOMIC24_INIT(i) { ((i) << 8) } - -static inline int atomic24_read(const atomic24_t *v) -{ - int ret = v->counter; - - while(ret & 0xff) - ret = v->counter; - - return ret >> 8; -} - -#define atomic24_set(v, i) (((v)->counter) = ((i) << 8)) +#include <asm-sparc/atomic_32.h> +#endif #endif - -static inline int __atomic24_add(int i, atomic24_t *v) -{ - register volatile int *ptr asm("g1"); - register int increment asm("g2"); - register int tmp1 asm("g3"); - register int tmp2 asm("g4"); - register int tmp3 asm("g7"); - - ptr = &v->counter; - increment = i; - - __asm__ __volatile__( - "mov %%o7, %%g4\n\t" - "call ___atomic24_add\n\t" - " add %%o7, 8, %%o7\n" - : "=&r" (increment), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3) - : "0" (increment), "r" (ptr) - : "memory", "cc"); - - return increment; -} - -static inline int __atomic24_sub(int i, atomic24_t *v) -{ - register volatile int *ptr asm("g1"); - register int increment asm("g2"); - register int tmp1 asm("g3"); - register int tmp2 asm("g4"); - register int tmp3 asm("g7"); - - ptr = &v->counter; - increment = i; - - __asm__ __volatile__( - "mov %%o7, %%g4\n\t" - "call ___atomic24_sub\n\t" - " add %%o7, 8, %%o7\n" - : "=&r" (increment), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3) - : "0" (increment), "r" (ptr) - : "memory", "cc"); - - return increment; -} - -#define atomic24_add(i, v) ((void)__atomic24_add((i), (v))) -#define atomic24_sub(i, v) ((void)__atomic24_sub((i), (v))) - -#define atomic24_dec_return(v) __atomic24_sub(1, (v)) -#define atomic24_inc_return(v) __atomic24_add(1, (v)) - -#define atomic24_sub_and_test(i, v) (__atomic24_sub((i), (v)) == 0) -#define atomic24_dec_and_test(v) (__atomic24_sub(1, (v)) == 0) - -#define atomic24_inc(v) ((void)__atomic24_add(1, (v))) -#define atomic24_dec(v) ((void)__atomic24_sub(1, (v))) - -#define atomic24_add_negative(i, v) (__atomic24_add((i), (v)) < 0) - -/* Atomic operations are already serializing */ -#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() - -#endif /* !(__KERNEL__) */ - -#include <asm-generic/atomic.h> -#endif /* !(__ARCH_SPARC_ATOMIC__) */ |