1a3b1d89ed
Split atomic64_t functions out into separate headers, since they will not be practical to merge between 32 and 64 bits. Signed-off-by: Brian Gerst <brgerst@gmail.com> LKML-Reference: <1262883215-4034-2-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
#ifndef _ASM_X86_ATOMIC64_32_H
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#define _ASM_X86_ATOMIC64_32_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/processor.h>
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//#include <asm/cmpxchg.h>
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/* An 64bit atomic type */
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typedef struct {
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u64 __aligned(8) counter;
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} atomic64_t;
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#define ATOMIC64_INIT(val) { (val) }
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extern u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val);
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/**
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* atomic64_xchg - xchg atomic64 variable
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* @ptr: pointer to type atomic64_t
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* @new_val: value to assign
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*
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* Atomically xchgs the value of @ptr to @new_val and returns
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* the old value.
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*/
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extern u64 atomic64_xchg(atomic64_t *ptr, u64 new_val);
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/**
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* atomic64_set - set atomic64 variable
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* @ptr: pointer to type atomic64_t
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* @new_val: value to assign
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*
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* Atomically sets the value of @ptr to @new_val.
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*/
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extern void atomic64_set(atomic64_t *ptr, u64 new_val);
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/**
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* atomic64_read - read atomic64 variable
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* @ptr: pointer to type atomic64_t
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*
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* Atomically reads the value of @ptr and returns it.
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*/
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static inline u64 atomic64_read(atomic64_t *ptr)
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{
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u64 res;
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/*
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* Note, we inline this atomic64_t primitive because
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* it only clobbers EAX/EDX and leaves the others
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* untouched. We also (somewhat subtly) rely on the
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* fact that cmpxchg8b returns the current 64-bit value
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* of the memory location we are touching:
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*/
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asm volatile(
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"mov %%ebx, %%eax\n\t"
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"mov %%ecx, %%edx\n\t"
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LOCK_PREFIX "cmpxchg8b %1\n"
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: "=&A" (res)
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: "m" (*ptr)
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);
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return res;
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}
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extern u64 atomic64_read(atomic64_t *ptr);
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/**
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* atomic64_add_return - add and return
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* @delta: integer value to add
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* @ptr: pointer to type atomic64_t
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*
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* Atomically adds @delta to @ptr and returns @delta + *@ptr
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*/
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extern u64 atomic64_add_return(u64 delta, atomic64_t *ptr);
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/*
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* Other variants with different arithmetic operators:
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*/
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extern u64 atomic64_sub_return(u64 delta, atomic64_t *ptr);
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extern u64 atomic64_inc_return(atomic64_t *ptr);
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extern u64 atomic64_dec_return(atomic64_t *ptr);
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/**
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* atomic64_add - add integer to atomic64 variable
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* @delta: integer value to add
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* @ptr: pointer to type atomic64_t
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*
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* Atomically adds @delta to @ptr.
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*/
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extern void atomic64_add(u64 delta, atomic64_t *ptr);
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/**
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* atomic64_sub - subtract the atomic64 variable
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* @delta: integer value to subtract
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* @ptr: pointer to type atomic64_t
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*
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* Atomically subtracts @delta from @ptr.
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*/
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extern void atomic64_sub(u64 delta, atomic64_t *ptr);
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/**
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* atomic64_sub_and_test - subtract value from variable and test result
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* @delta: integer value to subtract
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* @ptr: pointer to type atomic64_t
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*
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* Atomically subtracts @delta from @ptr and returns
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* true if the result is zero, or false for all
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* other cases.
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*/
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extern int atomic64_sub_and_test(u64 delta, atomic64_t *ptr);
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/**
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* atomic64_inc - increment atomic64 variable
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* @ptr: pointer to type atomic64_t
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*
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* Atomically increments @ptr by 1.
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*/
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extern void atomic64_inc(atomic64_t *ptr);
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/**
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* atomic64_dec - decrement atomic64 variable
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* @ptr: pointer to type atomic64_t
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*
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* Atomically decrements @ptr by 1.
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*/
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extern void atomic64_dec(atomic64_t *ptr);
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/**
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* atomic64_dec_and_test - decrement and test
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* @ptr: pointer to type atomic64_t
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*
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* Atomically decrements @ptr by 1 and
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* returns true if the result is 0, or false for all other
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* cases.
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*/
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extern int atomic64_dec_and_test(atomic64_t *ptr);
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/**
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* atomic64_inc_and_test - increment and test
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* @ptr: pointer to type atomic64_t
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*
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* Atomically increments @ptr by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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extern int atomic64_inc_and_test(atomic64_t *ptr);
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/**
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* atomic64_add_negative - add and test if negative
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* @delta: integer value to add
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* @ptr: pointer to type atomic64_t
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*
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* Atomically adds @delta to @ptr and returns true
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* if the result is negative, or false when
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* result is greater than or equal to zero.
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*/
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extern int atomic64_add_negative(u64 delta, atomic64_t *ptr);
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#endif /* _ASM_X86_ATOMIC64_32_H */
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