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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-mips/atomic.h | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-mips/atomic.h')
-rw-r--r-- | include/asm-mips/atomic.h | 653 |
1 files changed, 653 insertions, 0 deletions
diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h new file mode 100644 index 0000000..7d89e87 --- /dev/null +++ b/include/asm-mips/atomic.h @@ -0,0 +1,653 @@ +/* + * 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 by Ralf Baechle + */ + +/* + * As workaround for the ATOMIC_DEC_AND_LOCK / atomic_dec_and_lock mess in + * <linux/spinlock.h> we have to include <linux/spinlock.h> outside the + * main big wrapper ... + */ +#include <linux/config.h> +#include <linux/spinlock.h> + +#ifndef _ASM_ATOMIC_H +#define _ASM_ATOMIC_H + +#include <asm/cpu-features.h> +#include <asm/war.h> + +extern spinlock_t atomic_lock; + +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__( + "1: ll %0, %1 # atomic_add \n" + " addu %0, %2 \n" + " sc %0, %1 \n" + " beqzl %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: ll %0, %1 # atomic_add \n" + " addu %0, %2 \n" + " sc %0, %1 \n" + " beqz %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + v->counter += i; + spin_unlock_irqrestore(&atomic_lock, 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__( + "1: ll %0, %1 # atomic_sub \n" + " subu %0, %2 \n" + " sc %0, %1 \n" + " beqzl %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: ll %0, %1 # atomic_sub \n" + " subu %0, %2 \n" + " sc %0, %1 \n" + " beqz %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + v->counter -= i; + spin_unlock_irqrestore(&atomic_lock, flags); + } +} + +/* + * Same as above, but return the result value + */ +static __inline__ int atomic_add_return(int i, atomic_t * v) +{ + unsigned long result; + + if (cpu_has_llsc && R10000_LLSC_WAR) { + unsigned long temp; + + __asm__ __volatile__( + "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" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: ll %1, %2 # atomic_add_return \n" + " addu %0, %1, %3 \n" + " sc %0, %2 \n" + " beqz %0, 1b \n" + " addu %0, %1, %3 \n" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + result = v->counter; + result += i; + v->counter = result; + spin_unlock_irqrestore(&atomic_lock, flags); + } + + return result; +} + +static __inline__ int atomic_sub_return(int i, atomic_t * v) +{ + unsigned long result; + + if (cpu_has_llsc && R10000_LLSC_WAR) { + unsigned long temp; + + __asm__ __volatile__( + "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" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: ll %1, %2 # atomic_sub_return \n" + " subu %0, %1, %3 \n" + " sc %0, %2 \n" + " beqz %0, 1b \n" + " subu %0, %1, %3 \n" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + result = v->counter; + result -= i; + v->counter = result; + spin_unlock_irqrestore(&atomic_lock, flags); + } + + return result; +} + +/* + * atomic_sub_if_positive - add integer to atomic variable + * @v: pointer of type atomic_t + * + * Atomically test @v and decrement if it is greater than 0. + * The function returns the old value of @v minus 1. + */ +static __inline__ int atomic_sub_if_positive(int i, atomic_t * v) +{ + unsigned long result; + + if (cpu_has_llsc && R10000_LLSC_WAR) { + unsigned long temp; + + __asm__ __volatile__( + "1: ll %1, %2 # atomic_sub_if_positive\n" + " subu %0, %1, %3 \n" + " bltz %0, 1f \n" + " sc %0, %2 \n" + " beqzl %0, 1b \n" + " sync \n" + "1: \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: ll %1, %2 # atomic_sub_if_positive\n" + " subu %0, %1, %3 \n" + " bltz %0, 1f \n" + " sc %0, %2 \n" + " beqz %0, 1b \n" + " sync \n" + "1: \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + result = v->counter; + result -= i; + if (result >= 0) + v->counter = result; + spin_unlock_irqrestore(&atomic_lock, flags); + } + + return result; +} + +#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_MIPS64 + +typedef struct { volatile __s64 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__( + "1: lld %0, %1 # atomic64_add \n" + " addu %0, %2 \n" + " scd %0, %1 \n" + " beqzl %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: lld %0, %1 # atomic64_add \n" + " addu %0, %2 \n" + " scd %0, %1 \n" + " beqz %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + v->counter += i; + spin_unlock_irqrestore(&atomic_lock, 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__( + "1: lld %0, %1 # atomic64_sub \n" + " subu %0, %2 \n" + " scd %0, %1 \n" + " beqzl %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: lld %0, %1 # atomic64_sub \n" + " subu %0, %2 \n" + " scd %0, %1 \n" + " beqz %0, 1b \n" + : "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter)); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + v->counter -= i; + spin_unlock_irqrestore(&atomic_lock, flags); + } +} + +/* + * Same as above, but return the result value + */ +static __inline__ long atomic64_add_return(long i, atomic64_t * v) +{ + unsigned long result; + + if (cpu_has_llsc && R10000_LLSC_WAR) { + unsigned long temp; + + __asm__ __volatile__( + "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" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: lld %1, %2 # atomic64_add_return \n" + " addu %0, %1, %3 \n" + " scd %0, %2 \n" + " beqz %0, 1b \n" + " addu %0, %1, %3 \n" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + result = v->counter; + result += i; + v->counter = result; + spin_unlock_irqrestore(&atomic_lock, flags); + } + + return result; +} + +static __inline__ long atomic64_sub_return(long i, atomic64_t * v) +{ + unsigned long result; + + if (cpu_has_llsc && R10000_LLSC_WAR) { + unsigned long temp; + + __asm__ __volatile__( + "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" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: lld %1, %2 # atomic64_sub_return \n" + " subu %0, %1, %3 \n" + " scd %0, %2 \n" + " beqz %0, 1b \n" + " subu %0, %1, %3 \n" + " sync \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + result = v->counter; + result -= i; + v->counter = result; + spin_unlock_irqrestore(&atomic_lock, flags); + } + + return result; +} + +/* + * atomic64_sub_if_positive - add integer to atomic variable + * @v: pointer of type atomic64_t + * + * Atomically test @v and decrement if it is greater than 0. + * The function returns the old value of @v minus 1. + */ +static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v) +{ + unsigned long result; + + if (cpu_has_llsc && R10000_LLSC_WAR) { + unsigned long temp; + + __asm__ __volatile__( + "1: lld %1, %2 # atomic64_sub_if_positive\n" + " dsubu %0, %1, %3 \n" + " bltz %0, 1f \n" + " scd %0, %2 \n" + " beqzl %0, 1b \n" + " sync \n" + "1: \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else if (cpu_has_llsc) { + unsigned long temp; + + __asm__ __volatile__( + "1: lld %1, %2 # atomic64_sub_if_positive\n" + " dsubu %0, %1, %3 \n" + " bltz %0, 1f \n" + " scd %0, %2 \n" + " beqz %0, 1b \n" + " sync \n" + "1: \n" + : "=&r" (result), "=&r" (temp), "=m" (v->counter) + : "Ir" (i), "m" (v->counter) + : "memory"); + } else { + unsigned long flags; + + spin_lock_irqsave(&atomic_lock, flags); + result = v->counter; + result -= i; + if (result >= 0) + v->counter = result; + spin_unlock_irqrestore(&atomic_lock, flags); + } + + return result; +} + +#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_MIPS64 */ + +/* + * atomic*_return operations are serializing but not the non-*_return + * versions. + */ +#define smp_mb__before_atomic_dec() smp_mb() +#define smp_mb__after_atomic_dec() smp_mb() +#define smp_mb__before_atomic_inc() smp_mb() +#define smp_mb__after_atomic_inc() smp_mb() + +#endif /* _ASM_ATOMIC_H */ |