forked from luck/tmp_suning_uos_patched
f055affb89
Do atomic_add_unless natively instead of using cmpxchg. Improved register allocation idea from Joel Schopp. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
419 lines
7.9 KiB
C
419 lines
7.9 KiB
C
#ifndef _ASM_POWERPC_ATOMIC_H_
|
|
#define _ASM_POWERPC_ATOMIC_H_
|
|
|
|
/*
|
|
* PowerPC atomic operations
|
|
*/
|
|
|
|
typedef struct { volatile int counter; } atomic_t;
|
|
|
|
#ifdef __KERNEL__
|
|
#include <linux/compiler.h>
|
|
#include <asm/synch.h>
|
|
#include <asm/asm-compat.h>
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
#define atomic_read(v) ((v)->counter)
|
|
#define atomic_set(v,i) (((v)->counter) = (i))
|
|
|
|
static __inline__ void atomic_add(int a, atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: lwarx %0,0,%3 # atomic_add\n\
|
|
add %0,%2,%0\n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (a), "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ int atomic_add_return(int a, atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: lwarx %0,0,%2 # atomic_add_return\n\
|
|
add %0,%1,%0\n"
|
|
PPC405_ERR77(0,%2)
|
|
" stwcx. %0,0,%2 \n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (a), "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
|
|
|
|
static __inline__ void atomic_sub(int a, atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: lwarx %0,0,%3 # atomic_sub\n\
|
|
subf %0,%2,%0\n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (a), "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ int atomic_sub_return(int a, atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: lwarx %0,0,%2 # atomic_sub_return\n\
|
|
subf %0,%1,%0\n"
|
|
PPC405_ERR77(0,%2)
|
|
" stwcx. %0,0,%2 \n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (a), "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
static __inline__ void atomic_inc(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: lwarx %0,0,%2 # atomic_inc\n\
|
|
addic %0,%0,1\n"
|
|
PPC405_ERR77(0,%2)
|
|
" stwcx. %0,0,%2 \n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ int atomic_inc_return(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: lwarx %0,0,%1 # atomic_inc_return\n\
|
|
addic %0,%0,1\n"
|
|
PPC405_ERR77(0,%1)
|
|
" stwcx. %0,0,%1 \n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
|
|
static __inline__ void atomic_dec(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: lwarx %0,0,%2 # atomic_dec\n\
|
|
addic %0,%0,-1\n"
|
|
PPC405_ERR77(0,%2)\
|
|
" stwcx. %0,0,%2\n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ int atomic_dec_return(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: lwarx %0,0,%1 # atomic_dec_return\n\
|
|
addic %0,%0,-1\n"
|
|
PPC405_ERR77(0,%1)
|
|
" stwcx. %0,0,%1\n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
#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 non-zero if @v was not @u, and zero otherwise.
|
|
*/
|
|
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__ (
|
|
LWSYNC_ON_SMP
|
|
"1: lwarx %0,0,%1 # atomic_add_unless\n\
|
|
cmpw 0,%0,%3 \n\
|
|
beq- 2f \n\
|
|
add %0,%2,%0 \n"
|
|
PPC405_ERR77(0,%2)
|
|
" stwcx. %0,0,%1 \n\
|
|
bne- 1b \n"
|
|
ISYNC_ON_SMP
|
|
" subf %0,%2,%0 \n\
|
|
2:"
|
|
: "=&r" (t)
|
|
: "r" (&v->counter), "r" (a), "r" (u)
|
|
: "cc", "memory");
|
|
|
|
return t != u;
|
|
}
|
|
|
|
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
|
|
|
#define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
|
|
#define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
|
|
|
|
/*
|
|
* 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_dec_if_positive(atomic_t *v)
|
|
{
|
|
int t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: lwarx %0,0,%1 # atomic_dec_if_positive\n\
|
|
addic. %0,%0,-1\n\
|
|
blt- 2f\n"
|
|
PPC405_ERR77(0,%1)
|
|
" stwcx. %0,0,%1\n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
"\n\
|
|
2:" : "=&r" (t)
|
|
: "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
#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()
|
|
|
|
#ifdef __powerpc64__
|
|
|
|
typedef struct { volatile long counter; } atomic64_t;
|
|
|
|
#define ATOMIC64_INIT(i) { (i) }
|
|
|
|
#define atomic64_read(v) ((v)->counter)
|
|
#define atomic64_set(v,i) (((v)->counter) = (i))
|
|
|
|
static __inline__ void atomic64_add(long a, atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: ldarx %0,0,%3 # atomic64_add\n\
|
|
add %0,%2,%0\n\
|
|
stdcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (a), "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ long atomic64_add_return(long a, atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: ldarx %0,0,%2 # atomic64_add_return\n\
|
|
add %0,%1,%0\n\
|
|
stdcx. %0,0,%2 \n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (a), "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
|
|
|
|
static __inline__ void atomic64_sub(long a, atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: ldarx %0,0,%3 # atomic64_sub\n\
|
|
subf %0,%2,%0\n\
|
|
stdcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (a), "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ long atomic64_sub_return(long a, atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: ldarx %0,0,%2 # atomic64_sub_return\n\
|
|
subf %0,%1,%0\n\
|
|
stdcx. %0,0,%2 \n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (a), "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
static __inline__ void atomic64_inc(atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: ldarx %0,0,%2 # atomic64_inc\n\
|
|
addic %0,%0,1\n\
|
|
stdcx. %0,0,%2 \n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ long atomic64_inc_return(atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: ldarx %0,0,%1 # atomic64_inc_return\n\
|
|
addic %0,%0,1\n\
|
|
stdcx. %0,0,%1 \n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
|
|
static __inline__ void atomic64_dec(atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
"1: ldarx %0,0,%2 # atomic64_dec\n\
|
|
addic %0,%0,-1\n\
|
|
stdcx. %0,0,%2\n\
|
|
bne- 1b"
|
|
: "=&r" (t), "=m" (v->counter)
|
|
: "r" (&v->counter), "m" (v->counter)
|
|
: "cc");
|
|
}
|
|
|
|
static __inline__ long atomic64_dec_return(atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: ldarx %0,0,%1 # atomic64_dec_return\n\
|
|
addic %0,%0,-1\n\
|
|
stdcx. %0,0,%1\n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
: "=&r" (t)
|
|
: "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
|
|
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
|
|
|
|
/*
|
|
* 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_dec_if_positive(atomic64_t *v)
|
|
{
|
|
long t;
|
|
|
|
__asm__ __volatile__(
|
|
LWSYNC_ON_SMP
|
|
"1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\
|
|
addic. %0,%0,-1\n\
|
|
blt- 2f\n\
|
|
stdcx. %0,0,%1\n\
|
|
bne- 1b"
|
|
ISYNC_ON_SMP
|
|
"\n\
|
|
2:" : "=&r" (t)
|
|
: "r" (&v->counter)
|
|
: "cc", "memory");
|
|
|
|
return t;
|
|
}
|
|
|
|
#endif /* __powerpc64__ */
|
|
|
|
#include <asm-generic/atomic.h>
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_POWERPC_ATOMIC_H_ */
|