x86: Split atomic64_t functions into seperate headers
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>
This commit is contained in:
Brian Gerst
committed by
H. Peter Anvin
H. Peter Anvin
parent
7269e8812a
commit
1a3b1d89ed
160
arch/x86/include/asm/atomic64_32.h
Normal file
160
arch/x86/include/asm/atomic64_32.h
Normal file
@@ -0,0 +1,160 @@
|
||||
#ifndef _ASM_X86_ATOMIC64_32_H
|
||||
#define _ASM_X86_ATOMIC64_32_H
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/types.h>
|
||||
#include <asm/processor.h>
|
||||
//#include <asm/cmpxchg.h>
|
||||
|
||||
/* An 64bit atomic type */
|
||||
|
||||
typedef struct {
|
||||
u64 __aligned(8) counter;
|
||||
} atomic64_t;
|
||||
|
||||
#define ATOMIC64_INIT(val) { (val) }
|
||||
|
||||
extern u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val);
|
||||
|
||||
/**
|
||||
* atomic64_xchg - xchg atomic64 variable
|
||||
* @ptr: pointer to type atomic64_t
|
||||
* @new_val: value to assign
|
||||
*
|
||||
* Atomically xchgs the value of @ptr to @new_val and returns
|
||||
* the old value.
|
||||
*/
|
||||
extern u64 atomic64_xchg(atomic64_t *ptr, u64 new_val);
|
||||
|
||||
/**
|
||||
* atomic64_set - set atomic64 variable
|
||||
* @ptr: pointer to type atomic64_t
|
||||
* @new_val: value to assign
|
||||
*
|
||||
* Atomically sets the value of @ptr to @new_val.
|
||||
*/
|
||||
extern void atomic64_set(atomic64_t *ptr, u64 new_val);
|
||||
|
||||
/**
|
||||
* atomic64_read - read atomic64 variable
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically reads the value of @ptr and returns it.
|
||||
*/
|
||||
static inline u64 atomic64_read(atomic64_t *ptr)
|
||||
{
|
||||
u64 res;
|
||||
|
||||
/*
|
||||
* Note, we inline this atomic64_t primitive because
|
||||
* it only clobbers EAX/EDX and leaves the others
|
||||
* untouched. We also (somewhat subtly) rely on the
|
||||
* fact that cmpxchg8b returns the current 64-bit value
|
||||
* of the memory location we are touching:
|
||||
*/
|
||||
asm volatile(
|
||||
"mov %%ebx, %%eax\n\t"
|
||||
"mov %%ecx, %%edx\n\t"
|
||||
LOCK_PREFIX "cmpxchg8b %1\n"
|
||||
: "=&A" (res)
|
||||
: "m" (*ptr)
|
||||
);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
extern u64 atomic64_read(atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_add_return - add and return
|
||||
* @delta: integer value to add
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically adds @delta to @ptr and returns @delta + *@ptr
|
||||
*/
|
||||
extern u64 atomic64_add_return(u64 delta, atomic64_t *ptr);
|
||||
|
||||
/*
|
||||
* Other variants with different arithmetic operators:
|
||||
*/
|
||||
extern u64 atomic64_sub_return(u64 delta, atomic64_t *ptr);
|
||||
extern u64 atomic64_inc_return(atomic64_t *ptr);
|
||||
extern u64 atomic64_dec_return(atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_add - add integer to atomic64 variable
|
||||
* @delta: integer value to add
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically adds @delta to @ptr.
|
||||
*/
|
||||
extern void atomic64_add(u64 delta, atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_sub - subtract the atomic64 variable
|
||||
* @delta: integer value to subtract
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically subtracts @delta from @ptr.
|
||||
*/
|
||||
extern void atomic64_sub(u64 delta, atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_sub_and_test - subtract value from variable and test result
|
||||
* @delta: integer value to subtract
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically subtracts @delta from @ptr and returns
|
||||
* true if the result is zero, or false for all
|
||||
* other cases.
|
||||
*/
|
||||
extern int atomic64_sub_and_test(u64 delta, atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_inc - increment atomic64 variable
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically increments @ptr by 1.
|
||||
*/
|
||||
extern void atomic64_inc(atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_dec - decrement atomic64 variable
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically decrements @ptr by 1.
|
||||
*/
|
||||
extern void atomic64_dec(atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_dec_and_test - decrement and test
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically decrements @ptr by 1 and
|
||||
* returns true if the result is 0, or false for all other
|
||||
* cases.
|
||||
*/
|
||||
extern int atomic64_dec_and_test(atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_inc_and_test - increment and test
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically increments @ptr by 1
|
||||
* and returns true if the result is zero, or false for all
|
||||
* other cases.
|
||||
*/
|
||||
extern int atomic64_inc_and_test(atomic64_t *ptr);
|
||||
|
||||
/**
|
||||
* atomic64_add_negative - add and test if negative
|
||||
* @delta: integer value to add
|
||||
* @ptr: pointer to type atomic64_t
|
||||
*
|
||||
* Atomically adds @delta to @ptr and returns true
|
||||
* if the result is negative, or false when
|
||||
* result is greater than or equal to zero.
|
||||
*/
|
||||
extern int atomic64_add_negative(u64 delta, atomic64_t *ptr);
|
||||
|
||||
#endif /* _ASM_X86_ATOMIC64_32_H */
|
||||
Reference in New Issue
Block a user