diff options
Diffstat (limited to 'include/asm-mips/atomic.h')
| -rw-r--r-- | include/asm-mips/atomic.h | 801 |
1 files changed, 0 insertions, 801 deletions
diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h deleted file mode 100644 index 1232be3..0000000 --- a/include/asm-mips/atomic.h +++ /dev/null @@ -1,801 +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 much more slower - * than regular operations. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 1996, 97, 99, 2000, 03, 04, 06 by Ralf Baechle - */ -#ifndef _ASM_ATOMIC_H -#define _ASM_ATOMIC_H - -#include <linux/irqflags.h> -#include <asm/barrier.h> -#include <asm/cpu-features.h> -#include <asm/war.h> -#include <asm/system.h> - -typedef struct { volatile 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) -{ - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %0, %1 # atomic_add \n" - " addu %0, %2 \n" - " sc %0, %1 \n" - " beqzl %0, 1b \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %0, %1 # atomic_add \n" - " addu %0, %2 \n" - " sc %0, %1 \n" - " beqz %0, 2f \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - v->counter += i; - raw_local_irq_restore(flags); - } -} - -/* - * atomic_sub - subtract the 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) -{ - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %0, %1 # atomic_sub \n" - " subu %0, %2 \n" - " sc %0, %1 \n" - " beqzl %0, 1b \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %0, %1 # atomic_sub \n" - " subu %0, %2 \n" - " sc %0, %1 \n" - " beqz %0, 2f \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - v->counter -= i; - raw_local_irq_restore(flags); - } -} - -/* - * Same as above, but return the result value - */ -static __inline__ int atomic_add_return(int i, atomic_t * v) -{ - unsigned long result; - - smp_llsc_mb(); - - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %1, %2 # atomic_add_return \n" - " addu %0, %1, %3 \n" - " sc %0, %2 \n" - " beqzl %0, 1b \n" - " addu %0, %1, %3 \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %1, %2 # atomic_add_return \n" - " addu %0, %1, %3 \n" - " sc %0, %2 \n" - " beqz %0, 2f \n" - " addu %0, %1, %3 \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - result = v->counter; - result += i; - v->counter = result; - raw_local_irq_restore(flags); - } - - smp_llsc_mb(); - - return result; -} - -static __inline__ int atomic_sub_return(int i, atomic_t * v) -{ - unsigned long result; - - smp_llsc_mb(); - - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %1, %2 # atomic_sub_return \n" - " subu %0, %1, %3 \n" - " sc %0, %2 \n" - " beqzl %0, 1b \n" - " subu %0, %1, %3 \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %1, %2 # atomic_sub_return \n" - " subu %0, %1, %3 \n" - " sc %0, %2 \n" - " beqz %0, 2f \n" - " subu %0, %1, %3 \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - result = v->counter; - result -= i; - v->counter = result; - raw_local_irq_restore(flags); - } - - smp_llsc_mb(); - - 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) -{ - unsigned long result; - - smp_llsc_mb(); - - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %1, %2 # atomic_sub_if_positive\n" - " subu %0, %1, %3 \n" - " bltz %0, 1f \n" - " sc %0, %2 \n" - " .set noreorder \n" - " beqzl %0, 1b \n" - " subu %0, %1, %3 \n" - " .set reorder \n" - "1: \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: ll %1, %2 # atomic_sub_if_positive\n" - " subu %0, %1, %3 \n" - " bltz %0, 1f \n" - " sc %0, %2 \n" - " .set noreorder \n" - " beqz %0, 2f \n" - " subu %0, %1, %3 \n" - " .set reorder \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - "1: \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - result = v->counter; - result -= i; - if (result >= 0) - v->counter = result; - raw_local_irq_restore(flags); - } - - smp_llsc_mb(); - - return result; -} - -#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) -#define atomic_xchg(v, new) (xchg(&((v)->counter), (new))) - -/** - * 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 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_dec_return(v) atomic_sub_return(1, (v)) -#define atomic_inc_return(v) atomic_add_return(1, (v)) - -/* - * 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. - */ -#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (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) - -/* - * atomic_dec_and_test - decrement by 1 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. - */ -#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) - -/* - * atomic_dec_if_positive - decrement by 1 if old value positive - * @v: pointer of type atomic_t - */ -#define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v) - -/* - * atomic_inc - increment atomic variable - * @v: pointer of type atomic_t - * - * Atomically increments @v by 1. - */ -#define atomic_inc(v) atomic_add(1, (v)) - -/* - * atomic_dec - decrement and test - * @v: pointer of type atomic_t - * - * Atomically decrements @v by 1. - */ -#define atomic_dec(v) atomic_sub(1, (v)) - -/* - * 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. - */ -#define atomic_add_negative(i, v) (atomic_add_return(i, (v)) < 0) - -#ifdef CONFIG_64BIT - -typedef struct { volatile long counter; } atomic64_t; - -#define ATOMIC64_INIT(i) { (i) } - -/* - * atomic64_read - read atomic variable - * @v: pointer of type atomic64_t - * - */ -#define atomic64_read(v) ((v)->counter) - -/* - * atomic64_set - set atomic variable - * @v: pointer of type atomic64_t - * @i: required value - */ -#define atomic64_set(v, i) ((v)->counter = (i)) - -/* - * atomic64_add - add integer to atomic variable - * @i: integer value to add - * @v: pointer of type atomic64_t - * - * Atomically adds @i to @v. - */ -static __inline__ void atomic64_add(long i, atomic64_t * v) -{ - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %0, %1 # atomic64_add \n" - " addu %0, %2 \n" - " scd %0, %1 \n" - " beqzl %0, 1b \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %0, %1 # atomic64_add \n" - " addu %0, %2 \n" - " scd %0, %1 \n" - " beqz %0, 2f \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - v->counter += i; - raw_local_irq_restore(flags); - } -} - -/* - * atomic64_sub - subtract the atomic variable - * @i: integer value to subtract - * @v: pointer of type atomic64_t - * - * Atomically subtracts @i from @v. - */ -static __inline__ void atomic64_sub(long i, atomic64_t * v) -{ - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %0, %1 # atomic64_sub \n" - " subu %0, %2 \n" - " scd %0, %1 \n" - " beqzl %0, 1b \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %0, %1 # atomic64_sub \n" - " subu %0, %2 \n" - " scd %0, %1 \n" - " beqz %0, 2f \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter)); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - v->counter -= i; - raw_local_irq_restore(flags); - } -} - -/* - * Same as above, but return the result value - */ -static __inline__ long atomic64_add_return(long i, atomic64_t * v) -{ - unsigned long result; - - smp_llsc_mb(); - - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %1, %2 # atomic64_add_return \n" - " addu %0, %1, %3 \n" - " scd %0, %2 \n" - " beqzl %0, 1b \n" - " addu %0, %1, %3 \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %1, %2 # atomic64_add_return \n" - " addu %0, %1, %3 \n" - " scd %0, %2 \n" - " beqz %0, 2f \n" - " addu %0, %1, %3 \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - result = v->counter; - result += i; - v->counter = result; - raw_local_irq_restore(flags); - } - - smp_llsc_mb(); - - return result; -} - -static __inline__ long atomic64_sub_return(long i, atomic64_t * v) -{ - unsigned long result; - - smp_llsc_mb(); - - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %1, %2 # atomic64_sub_return \n" - " subu %0, %1, %3 \n" - " scd %0, %2 \n" - " beqzl %0, 1b \n" - " subu %0, %1, %3 \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %1, %2 # atomic64_sub_return \n" - " subu %0, %1, %3 \n" - " scd %0, %2 \n" - " beqz %0, 2f \n" - " subu %0, %1, %3 \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - result = v->counter; - result -= i; - v->counter = result; - raw_local_irq_restore(flags); - } - - smp_llsc_mb(); - - return result; -} - -/* - * atomic64_sub_if_positive - conditionally subtract integer from atomic variable - * @i: integer value to subtract - * @v: pointer of type atomic64_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__ long atomic64_sub_if_positive(long i, atomic64_t * v) -{ - unsigned long result; - - smp_llsc_mb(); - - if (cpu_has_llsc && R10000_LLSC_WAR) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %1, %2 # atomic64_sub_if_positive\n" - " dsubu %0, %1, %3 \n" - " bltz %0, 1f \n" - " scd %0, %2 \n" - " .set noreorder \n" - " beqzl %0, 1b \n" - " dsubu %0, %1, %3 \n" - " .set reorder \n" - "1: \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else if (cpu_has_llsc) { - unsigned long temp; - - __asm__ __volatile__( - " .set mips3 \n" - "1: lld %1, %2 # atomic64_sub_if_positive\n" - " dsubu %0, %1, %3 \n" - " bltz %0, 1f \n" - " scd %0, %2 \n" - " .set noreorder \n" - " beqz %0, 2f \n" - " dsubu %0, %1, %3 \n" - " .set reorder \n" - " .subsection 2 \n" - "2: b 1b \n" - " .previous \n" - "1: \n" - " .set mips0 \n" - : "=&r" (result), "=&r" (temp), "=m" (v->counter) - : "Ir" (i), "m" (v->counter) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - result = v->counter; - result -= i; - if (result >= 0) - v->counter = result; - raw_local_irq_restore(flags); - } - - smp_llsc_mb(); - - return result; -} - -#define atomic64_cmpxchg(v, o, n) \ - ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) -#define atomic64_xchg(v, new) (xchg(&((v)->counter), (new))) - -/** - * atomic64_add_unless - add unless the number is a given value - * @v: pointer of type atomic64_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 non-zero if @v was not @u, and zero otherwise. - */ -static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) -{ - long c, old; - c = atomic64_read(v); - for (;;) { - if (unlikely(c == (u))) - break; - old = atomic64_cmpxchg((v), c, c + (a)); - if (likely(old == c)) - break; - c = old; - } - return c != (u); -} - -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - -#define atomic64_dec_return(v) atomic64_sub_return(1, (v)) -#define atomic64_inc_return(v) atomic64_add_return(1, (v)) - -/* - * atomic64_sub_and_test - subtract value from variable and test result - * @i: integer value to subtract - * @v: pointer of type atomic64_t - * - * Atomically subtracts @i from @v and returns - * true if the result is zero, or false for all - * other cases. - */ -#define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v)) == 0) - -/* - * atomic64_inc_and_test - increment and test - * @v: pointer of type atomic64_t - * - * Atomically increments @v by 1 - * and returns true if the result is zero, or false for all - * other cases. - */ -#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) - -/* - * atomic64_dec_and_test - decrement by 1 and test - * @v: pointer of type atomic64_t - * - * Atomically decrements @v by 1 and - * returns true if the result is 0, or false for all other - * cases. - */ -#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) - -/* - * atomic64_dec_if_positive - decrement by 1 if old value positive - * @v: pointer of type atomic64_t - */ -#define atomic64_dec_if_positive(v) atomic64_sub_if_positive(1, v) - -/* - * atomic64_inc - increment atomic variable - * @v: pointer of type atomic64_t - * - * Atomically increments @v by 1. - */ -#define atomic64_inc(v) atomic64_add(1, (v)) - -/* - * atomic64_dec - decrement and test - * @v: pointer of type atomic64_t - * - * Atomically decrements @v by 1. - */ -#define atomic64_dec(v) atomic64_sub(1, (v)) - -/* - * atomic64_add_negative - add and test if negative - * @v: pointer of type atomic64_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. - */ -#define atomic64_add_negative(i, v) (atomic64_add_return(i, (v)) < 0) - -#endif /* CONFIG_64BIT */ - -/* - * atomic*_return operations are serializing but not the non-*_return - * versions. - */ -#define smp_mb__before_atomic_dec() smp_llsc_mb() -#define smp_mb__after_atomic_dec() smp_llsc_mb() -#define smp_mb__before_atomic_inc() smp_llsc_mb() -#define smp_mb__after_atomic_inc() smp_llsc_mb() - -#include <asm-generic/atomic.h> - -#endif /* _ASM_ATOMIC_H */ |