275 lines
6.2 KiB
C
275 lines
6.2 KiB
C
#ifndef _ASM_M32R_ATOMIC_H
|
|
#define _ASM_M32R_ATOMIC_H
|
|
|
|
/*
|
|
* linux/include/asm-m32r/atomic.h
|
|
*
|
|
* M32R version:
|
|
* Copyright (C) 2001, 2002 Hitoshi Yamamoto
|
|
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/cmpxchg.h>
|
|
#include <asm/dcache_clear.h>
|
|
#include <asm/barrier.h>
|
|
|
|
/*
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
* resource counting etc..
|
|
*/
|
|
|
|
#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) READ_ONCE((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) WRITE_ONCE(((v)->counter), (i))
|
|
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
#define __ATOMIC_CLOBBER , "r4"
|
|
#else
|
|
#define __ATOMIC_CLOBBER
|
|
#endif
|
|
|
|
#define ATOMIC_OP(op) \
|
|
static __inline__ void atomic_##op(int i, atomic_t *v) \
|
|
{ \
|
|
unsigned long flags; \
|
|
int result; \
|
|
\
|
|
local_irq_save(flags); \
|
|
__asm__ __volatile__ ( \
|
|
"# atomic_" #op " \n\t" \
|
|
DCACHE_CLEAR("%0", "r4", "%1") \
|
|
M32R_LOCK" %0, @%1; \n\t" \
|
|
#op " %0, %2; \n\t" \
|
|
M32R_UNLOCK" %0, @%1; \n\t" \
|
|
: "=&r" (result) \
|
|
: "r" (&v->counter), "r" (i) \
|
|
: "memory" \
|
|
__ATOMIC_CLOBBER \
|
|
); \
|
|
local_irq_restore(flags); \
|
|
} \
|
|
|
|
#define ATOMIC_OP_RETURN(op) \
|
|
static __inline__ int atomic_##op##_return(int i, atomic_t *v) \
|
|
{ \
|
|
unsigned long flags; \
|
|
int result; \
|
|
\
|
|
local_irq_save(flags); \
|
|
__asm__ __volatile__ ( \
|
|
"# atomic_" #op "_return \n\t" \
|
|
DCACHE_CLEAR("%0", "r4", "%1") \
|
|
M32R_LOCK" %0, @%1; \n\t" \
|
|
#op " %0, %2; \n\t" \
|
|
M32R_UNLOCK" %0, @%1; \n\t" \
|
|
: "=&r" (result) \
|
|
: "r" (&v->counter), "r" (i) \
|
|
: "memory" \
|
|
__ATOMIC_CLOBBER \
|
|
); \
|
|
local_irq_restore(flags); \
|
|
\
|
|
return result; \
|
|
}
|
|
|
|
#define ATOMIC_FETCH_OP(op) \
|
|
static __inline__ int atomic_fetch_##op(int i, atomic_t *v) \
|
|
{ \
|
|
unsigned long flags; \
|
|
int result, val; \
|
|
\
|
|
local_irq_save(flags); \
|
|
__asm__ __volatile__ ( \
|
|
"# atomic_fetch_" #op " \n\t" \
|
|
DCACHE_CLEAR("%0", "r4", "%2") \
|
|
M32R_LOCK" %1, @%2; \n\t" \
|
|
"mv %0, %1 \n\t" \
|
|
#op " %1, %3; \n\t" \
|
|
M32R_UNLOCK" %1, @%2; \n\t" \
|
|
: "=&r" (result), "=&r" (val) \
|
|
: "r" (&v->counter), "r" (i) \
|
|
: "memory" \
|
|
__ATOMIC_CLOBBER \
|
|
); \
|
|
local_irq_restore(flags); \
|
|
\
|
|
return result; \
|
|
}
|
|
|
|
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
|
|
|
|
ATOMIC_OPS(add)
|
|
ATOMIC_OPS(sub)
|
|
|
|
#undef ATOMIC_OPS
|
|
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
|
|
|
|
ATOMIC_OPS(and)
|
|
ATOMIC_OPS(or)
|
|
ATOMIC_OPS(xor)
|
|
|
|
#undef ATOMIC_OPS
|
|
#undef ATOMIC_FETCH_OP
|
|
#undef ATOMIC_OP_RETURN
|
|
#undef ATOMIC_OP
|
|
|
|
/**
|
|
* 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_return - increment atomic variable and return it
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically increments @v by 1 and returns the result.
|
|
*/
|
|
static __inline__ int atomic_inc_return(atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
int result;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# atomic_inc_return \n\t"
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
M32R_LOCK" %0, @%1; \n\t"
|
|
"addi %0, #1; \n\t"
|
|
M32R_UNLOCK" %0, @%1; \n\t"
|
|
: "=&r" (result)
|
|
: "r" (&v->counter)
|
|
: "memory"
|
|
__ATOMIC_CLOBBER
|
|
);
|
|
local_irq_restore(flags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* atomic_dec_return - decrement atomic variable and return it
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically decrements @v by 1 and returns the result.
|
|
*/
|
|
static __inline__ int atomic_dec_return(atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
int result;
|
|
|
|
local_irq_save(flags);
|
|
__asm__ __volatile__ (
|
|
"# atomic_dec_return \n\t"
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
M32R_LOCK" %0, @%1; \n\t"
|
|
"addi %0, #-1; \n\t"
|
|
M32R_UNLOCK" %0, @%1; \n\t"
|
|
: "=&r" (result)
|
|
: "r" (&v->counter)
|
|
: "memory"
|
|
__ATOMIC_CLOBBER
|
|
);
|
|
local_irq_restore(flags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* atomic_inc - increment atomic variable
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically increments @v by 1.
|
|
*/
|
|
#define atomic_inc(v) ((void)atomic_inc_return(v))
|
|
|
|
/**
|
|
* atomic_dec - decrement atomic variable
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically decrements @v by 1.
|
|
*/
|
|
#define atomic_dec(v) ((void)atomic_dec_return(v))
|
|
|
|
/**
|
|
* 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 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_dec_return(v) == 0)
|
|
|
|
/**
|
|
* 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)
|
|
|
|
#define atomic_cmpxchg(v, o, n) ((int)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 the old value of @v.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
#endif /* _ASM_M32R_ATOMIC_H */
|