[thirdparty/linux.git] / arch / powerpc / include / asm / local.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ARCH_POWERPC_LOCAL_H
#define _ARCH_POWERPC_LOCAL_H

#include <linux/percpu.h>
#include <linux/atomic.h>

typedef struct
{
	atomic_long_t a;
} local_t;

#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }

#define local_read(l)	atomic_long_read(&(l)->a)
#define local_set(l,i)	atomic_long_set(&(l)->a, (i))

#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))
#define local_inc(l)	atomic_long_inc(&(l)->a)
#define local_dec(l)	atomic_long_dec(&(l)->a)

static __inline__ long local_add_return(long a, local_t *l)
{
	long t;

	__asm__ __volatile__(
"1:"	PPC_LLARX(%0,0,%2,0) "			# local_add_return\n\
	add	%0,%1,%0\n"
	PPC405_ERR77(0,%2)
	PPC_STLCX	"%0,0,%2 \n\
	bne-	1b"
	: "=&r" (t)
	: "r" (a), "r" (&(l->a.counter))
	: "cc", "memory");

	return t;
}

#define local_add_negative(a, l)	(local_add_return((a), (l)) < 0)

static __inline__ long local_sub_return(long a, local_t *l)
{
	long t;

	__asm__ __volatile__(
"1:"	PPC_LLARX(%0,0,%2,0) "			# local_sub_return\n\
	subf	%0,%1,%0\n"
	PPC405_ERR77(0,%2)
	PPC_STLCX	"%0,0,%2 \n\
	bne-	1b"
	: "=&r" (t)
	: "r" (a), "r" (&(l->a.counter))
	: "cc", "memory");

	return t;
}

static __inline__ long local_inc_return(local_t *l)
{
	long t;

	__asm__ __volatile__(
"1:"	PPC_LLARX(%0,0,%1,0) "			# local_inc_return\n\
	addic	%0,%0,1\n"
	PPC405_ERR77(0,%1)
	PPC_STLCX	"%0,0,%1 \n\
	bne-	1b"
	: "=&r" (t)
	: "r" (&(l->a.counter))
	: "cc", "xer", "memory");

	return t;
}

/*
 * local_inc_and_test - increment and test
 * @l: pointer of type local_t
 *
 * Atomically increments @l by 1
 * and returns true if the result is zero, or false for all
 * other cases.
 */
#define local_inc_and_test(l) (local_inc_return(l) == 0)

static __inline__ long local_dec_return(local_t *l)
{
	long t;

	__asm__ __volatile__(
"1:"	PPC_LLARX(%0,0,%1,0) "			# local_dec_return\n\
	addic	%0,%0,-1\n"
	PPC405_ERR77(0,%1)
	PPC_STLCX	"%0,0,%1\n\
	bne-	1b"
	: "=&r" (t)
	: "r" (&(l->a.counter))
	: "cc", "xer", "memory");

	return t;
}

#define local_cmpxchg(l, o, n) \
	(cmpxchg_local(&((l)->a.counter), (o), (n)))
#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))

/**
 * local_add_unless - add unless the number is a given value
 * @l: pointer of type local_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @l, so long as it was not @u.
 * Returns non-zero if @l was not @u, and zero otherwise.
 */
static __inline__ int local_add_unless(local_t *l, long a, long u)
{
	long t;

	__asm__ __volatile__ (
"1:"	PPC_LLARX(%0,0,%1,0) "			# local_add_unless\n\
	cmpw	0,%0,%3 \n\
	beq-	2f \n\
	add	%0,%2,%0 \n"
	PPC405_ERR77(0,%2)
	PPC_STLCX	"%0,0,%1 \n\
	bne-	1b \n"
"	subf	%0,%2,%0 \n\
2:"
	: "=&r" (t)
	: "r" (&(l->a.counter)), "r" (a), "r" (u)
	: "cc", "memory");

	return t != u;
}

#define local_inc_not_zero(l) local_add_unless((l), 1, 0)

#define local_sub_and_test(a, l)	(local_sub_return((a), (l)) == 0)
#define local_dec_and_test(l)		(local_dec_return((l)) == 0)

/*
 * Atomically test *l and decrement if it is greater than 0.
 * The function returns the old value of *l minus 1.
 */
static __inline__ long local_dec_if_positive(local_t *l)
{
	long t;

	__asm__ __volatile__(
"1:"	PPC_LLARX(%0,0,%1,0) "			# local_dec_if_positive\n\
	cmpwi	%0,1\n\
	addi	%0,%0,-1\n\
	blt-	2f\n"
	PPC405_ERR77(0,%1)
	PPC_STLCX	"%0,0,%1\n\
	bne-	1b"
	"\n\
2:"	: "=&b" (t)
	: "r" (&(l->a.counter))
	: "cc", "memory");

	return t;
}

/* Use these for per-cpu local_t variables: on some archs they are
 * much more efficient than these naive implementations.  Note they take
 * a variable, not an address.
 */

#define __local_inc(l)		((l)->a.counter++)
#define __local_dec(l)		((l)->a.counter++)
#define __local_add(i,l)	((l)->a.counter+=(i))
#define __local_sub(i,l)	((l)->a.counter-=(i))

#endif /* _ARCH_POWERPC_LOCAL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
6d8944a0 MD	2	#ifndef _ARCH_POWERPC_LOCAL_H
	3	#define _ARCH_POWERPC_LOCAL_H
	4
	5	#include <linux/percpu.h>
60063497	6	#include <linux/atomic.h>
6d8944a0 MD	7
	8	typedef struct
	9	{
	10	atomic_long_t a;
	11	} local_t;
	12
	13	#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
	14
	15	#define local_read(l) atomic_long_read(&(l)->a)
	16	#define local_set(l,i) atomic_long_set(&(l)->a, (i))
	17
	18	#define local_add(i,l) atomic_long_add((i),(&(l)->a))
	19	#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
	20	#define local_inc(l) atomic_long_inc(&(l)->a)
	21	#define local_dec(l) atomic_long_dec(&(l)->a)
	22
	23	static __inline__ long local_add_return(long a, local_t *l)
	24	{
	25	long t;
	26
	27	__asm__ __volatile__(
864b9e6f	28	"1:" PPC_LLARX(%0,0,%2,0) " # local_add_return\n\
6d8944a0 MD	29	add %0,%1,%0\n"
	30	PPC405_ERR77(0,%2)
	31	PPC_STLCX "%0,0,%2 \n\
	32	bne- 1b"
	33	: "=&r" (t)
	34	: "r" (a), "r" (&(l->a.counter))
	35	: "cc", "memory");
	36
	37	return t;
	38	}
	39
	40	#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
	41
	42	static __inline__ long local_sub_return(long a, local_t *l)
	43	{
	44	long t;
	45
	46	__asm__ __volatile__(
864b9e6f	47	"1:" PPC_LLARX(%0,0,%2,0) " # local_sub_return\n\
6d8944a0 MD	48	subf %0,%1,%0\n"
	49	PPC405_ERR77(0,%2)
	50	PPC_STLCX "%0,0,%2 \n\
	51	bne- 1b"
	52	: "=&r" (t)
	53	: "r" (a), "r" (&(l->a.counter))
	54	: "cc", "memory");
	55
	56	return t;
	57	}
	58
	59	static __inline__ long local_inc_return(local_t *l)
	60	{
	61	long t;
	62
	63	__asm__ __volatile__(
864b9e6f	64	"1:" PPC_LLARX(%0,0,%1,0) " # local_inc_return\n\
6d8944a0 MD	65	addic %0,%0,1\n"
	66	PPC405_ERR77(0,%1)
	67	PPC_STLCX "%0,0,%1 \n\
	68	bne- 1b"
	69	: "=&r" (t)
	70	: "r" (&(l->a.counter))
efc3624c	71	: "cc", "xer", "memory");
6d8944a0 MD	72
	73	return t;
	74	}
	75
	76	/*
	77	* local_inc_and_test - increment and test
	78	* @l: pointer of type local_t
	79	*
	80	* Atomically increments @l by 1
	81	* and returns true if the result is zero, or false for all
	82	* other cases.
	83	*/
	84	#define local_inc_and_test(l) (local_inc_return(l) == 0)
	85
	86	static __inline__ long local_dec_return(local_t *l)
	87	{
	88	long t;
	89
	90	__asm__ __volatile__(
864b9e6f	91	"1:" PPC_LLARX(%0,0,%1,0) " # local_dec_return\n\
6d8944a0 MD	92	addic %0,%0,-1\n"
	93	PPC405_ERR77(0,%1)
	94	PPC_STLCX "%0,0,%1\n\
	95	bne- 1b"
	96	: "=&r" (t)
	97	: "r" (&(l->a.counter))
efc3624c	98	: "cc", "xer", "memory");
6d8944a0 MD	99
	100	return t;
	101	}
	102
	103	#define local_cmpxchg(l, o, n) \
	104	(cmpxchg_local(&((l)->a.counter), (o), (n)))
	105	#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
	106
	107	/**
	108	* local_add_unless - add unless the number is a given value
	109	* @l: pointer of type local_t
	110	* @a: the amount to add to v...
	111	* @u: ...unless v is equal to u.
	112	*
	113	* Atomically adds @a to @l, so long as it was not @u.
	114	* Returns non-zero if @l was not @u, and zero otherwise.
	115	*/
	116	static __inline__ int local_add_unless(local_t *l, long a, long u)
	117	{
	118	long t;
	119
	120	__asm__ __volatile__ (
864b9e6f	121	"1:" PPC_LLARX(%0,0,%1,0) " # local_add_unless\n\
6d8944a0 MD	122	cmpw 0,%0,%3 \n\
	123	beq- 2f \n\
	124	add %0,%2,%0 \n"
	125	PPC405_ERR77(0,%2)
	126	PPC_STLCX "%0,0,%1 \n\
	127	bne- 1b \n"
	128	" subf %0,%2,%0 \n\
	129	2:"
	130	: "=&r" (t)
	131	: "r" (&(l->a.counter)), "r" (a), "r" (u)
	132	: "cc", "memory");
	133
	134	return t != u;
	135	}
	136
	137	#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
	138
	139	#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
	140	#define local_dec_and_test(l) (local_dec_return((l)) == 0)
	141
	142	/*
	143	* Atomically test *l and decrement if it is greater than 0.
	144	* The function returns the old value of *l minus 1.
	145	*/
	146	static __inline__ long local_dec_if_positive(local_t *l)
	147	{
	148	long t;
	149
	150	__asm__ __volatile__(
864b9e6f	151	"1:" PPC_LLARX(%0,0,%1,0) " # local_dec_if_positive\n\
6d8944a0 MD	152	cmpwi %0,1\n\
	153	addi %0,%0,-1\n\
	154	blt- 2f\n"
	155	PPC405_ERR77(0,%1)
	156	PPC_STLCX "%0,0,%1\n\
	157	bne- 1b"
	158	"\n\
	159	2:" : "=&b" (t)
	160	: "r" (&(l->a.counter))
	161	: "cc", "memory");
	162
	163	return t;
	164	}
	165
	166	/* Use these for per-cpu local_t variables: on some archs they are
	167	* much more efficient than these naive implementations. Note they take
	168	* a variable, not an address.
	169	*/
	170
	171	#define __local_inc(l) ((l)->a.counter++)
	172	#define __local_dec(l) ((l)->a.counter++)
	173	#define __local_add(i,l) ((l)->a.counter+=(i))
	174	#define __local_sub(i,l) ((l)->a.counter-=(i))
	175
6d8944a0	176	#endif /* _ARCH_POWERPC_LOCAL_H */