d0bdb11139
Summary: This is a more optimal way of doing atomic_compset_masked() than the fallback in sys/_atomic_subword.h. There's also an override for _atomic_fcmpset_masked_word(), which may or may not be necessary, and is unused for powerpc. Reviewed by: kevans, kib Differential Revision: https://reviews.freebsd.org/D22359
1030 lines
27 KiB
C
1030 lines
27 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2008 Marcel Moolenaar
|
|
* Copyright (c) 2001 Benno Rice
|
|
* Copyright (c) 2001 David E. O'Brien
|
|
* Copyright (c) 1998 Doug Rabson
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_ATOMIC_H_
|
|
#define _MACHINE_ATOMIC_H_
|
|
|
|
#ifndef _SYS_CDEFS_H_
|
|
#error this file needs sys/cdefs.h as a prerequisite
|
|
#endif
|
|
|
|
#include <sys/atomic_common.h>
|
|
|
|
/*
|
|
* The __ATOMIC_REL/ACQ() macros provide memory barriers only in conjunction
|
|
* with the atomic lXarx/stXcx. sequences below. They are not exposed outside
|
|
* of this file. See also Appendix B.2 of Book II of the architecture manual.
|
|
*
|
|
* Note that not all Book-E processors accept the light-weight sync variant.
|
|
* In particular, early models of E500 cores are known to wedge. Bank on all
|
|
* 64-bit capable CPUs to accept lwsync properly and pressimize 32-bit CPUs
|
|
* to use the heavier-weight sync.
|
|
*/
|
|
|
|
#ifdef __powerpc64__
|
|
#define mb() __asm __volatile("sync" : : : "memory")
|
|
#define rmb() __asm __volatile("lwsync" : : : "memory")
|
|
#define wmb() __asm __volatile("lwsync" : : : "memory")
|
|
#define __ATOMIC_REL() __asm __volatile("lwsync" : : : "memory")
|
|
#define __ATOMIC_ACQ() __asm __volatile("isync" : : : "memory")
|
|
#else
|
|
#define mb() __asm __volatile("sync" : : : "memory")
|
|
#define rmb() __asm __volatile("sync" : : : "memory")
|
|
#define wmb() __asm __volatile("sync" : : : "memory")
|
|
#define __ATOMIC_REL() __asm __volatile("sync" : : : "memory")
|
|
#define __ATOMIC_ACQ() __asm __volatile("isync" : : : "memory")
|
|
#endif
|
|
|
|
static __inline void
|
|
powerpc_lwsync(void)
|
|
{
|
|
|
|
#ifdef __powerpc64__
|
|
__asm __volatile("lwsync" : : : "memory");
|
|
#else
|
|
__asm __volatile("sync" : : : "memory");
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* atomic_add(p, v)
|
|
* { *p += v; }
|
|
*/
|
|
|
|
#define __atomic_add_int(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" add %0, %3, %0\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_add_int */
|
|
|
|
#ifdef __powerpc64__
|
|
#define __atomic_add_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: ldarx %0, 0, %2\n" \
|
|
" add %0, %3, %0\n" \
|
|
" stdcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_add_long */
|
|
#else
|
|
#define __atomic_add_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" add %0, %3, %0\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_add_long */
|
|
#endif
|
|
|
|
#define _ATOMIC_ADD(type) \
|
|
static __inline void \
|
|
atomic_add_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_add_##type(p, v, t); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_add_acq_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_add_##type(p, v, t); \
|
|
__ATOMIC_ACQ(); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_add_rel_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__ATOMIC_REL(); \
|
|
__atomic_add_##type(p, v, t); \
|
|
} \
|
|
/* _ATOMIC_ADD */
|
|
|
|
_ATOMIC_ADD(int)
|
|
_ATOMIC_ADD(long)
|
|
|
|
#define atomic_add_32 atomic_add_int
|
|
#define atomic_add_acq_32 atomic_add_acq_int
|
|
#define atomic_add_rel_32 atomic_add_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_add_64 atomic_add_long
|
|
#define atomic_add_acq_64 atomic_add_acq_long
|
|
#define atomic_add_rel_64 atomic_add_rel_long
|
|
|
|
#define atomic_add_ptr atomic_add_long
|
|
#define atomic_add_acq_ptr atomic_add_acq_long
|
|
#define atomic_add_rel_ptr atomic_add_rel_long
|
|
#else
|
|
#define atomic_add_ptr atomic_add_int
|
|
#define atomic_add_acq_ptr atomic_add_acq_int
|
|
#define atomic_add_rel_ptr atomic_add_rel_int
|
|
#endif
|
|
#undef _ATOMIC_ADD
|
|
#undef __atomic_add_long
|
|
#undef __atomic_add_int
|
|
|
|
/*
|
|
* atomic_clear(p, v)
|
|
* { *p &= ~v; }
|
|
*/
|
|
|
|
#define __atomic_clear_int(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" andc %0, %0, %3\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_clear_int */
|
|
|
|
#ifdef __powerpc64__
|
|
#define __atomic_clear_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: ldarx %0, 0, %2\n" \
|
|
" andc %0, %0, %3\n" \
|
|
" stdcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_clear_long */
|
|
#else
|
|
#define __atomic_clear_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" andc %0, %0, %3\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_clear_long */
|
|
#endif
|
|
|
|
#define _ATOMIC_CLEAR(type) \
|
|
static __inline void \
|
|
atomic_clear_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_clear_##type(p, v, t); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_clear_acq_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_clear_##type(p, v, t); \
|
|
__ATOMIC_ACQ(); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_clear_rel_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__ATOMIC_REL(); \
|
|
__atomic_clear_##type(p, v, t); \
|
|
} \
|
|
/* _ATOMIC_CLEAR */
|
|
|
|
|
|
_ATOMIC_CLEAR(int)
|
|
_ATOMIC_CLEAR(long)
|
|
|
|
#define atomic_clear_32 atomic_clear_int
|
|
#define atomic_clear_acq_32 atomic_clear_acq_int
|
|
#define atomic_clear_rel_32 atomic_clear_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_clear_64 atomic_clear_long
|
|
#define atomic_clear_acq_64 atomic_clear_acq_long
|
|
#define atomic_clear_rel_64 atomic_clear_rel_long
|
|
|
|
#define atomic_clear_ptr atomic_clear_long
|
|
#define atomic_clear_acq_ptr atomic_clear_acq_long
|
|
#define atomic_clear_rel_ptr atomic_clear_rel_long
|
|
#else
|
|
#define atomic_clear_ptr atomic_clear_int
|
|
#define atomic_clear_acq_ptr atomic_clear_acq_int
|
|
#define atomic_clear_rel_ptr atomic_clear_rel_int
|
|
#endif
|
|
#undef _ATOMIC_CLEAR
|
|
#undef __atomic_clear_long
|
|
#undef __atomic_clear_int
|
|
|
|
/*
|
|
* atomic_cmpset(p, o, n)
|
|
*/
|
|
/* TODO -- see below */
|
|
|
|
/*
|
|
* atomic_load_acq(p)
|
|
*/
|
|
/* TODO -- see below */
|
|
|
|
/*
|
|
* atomic_readandclear(p)
|
|
*/
|
|
/* TODO -- see below */
|
|
|
|
/*
|
|
* atomic_set(p, v)
|
|
* { *p |= v; }
|
|
*/
|
|
|
|
#define __atomic_set_int(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" or %0, %3, %0\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_set_int */
|
|
|
|
#ifdef __powerpc64__
|
|
#define __atomic_set_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: ldarx %0, 0, %2\n" \
|
|
" or %0, %3, %0\n" \
|
|
" stdcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_set_long */
|
|
#else
|
|
#define __atomic_set_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" or %0, %3, %0\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_set_long */
|
|
#endif
|
|
|
|
#define _ATOMIC_SET(type) \
|
|
static __inline void \
|
|
atomic_set_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_set_##type(p, v, t); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_set_acq_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_set_##type(p, v, t); \
|
|
__ATOMIC_ACQ(); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_set_rel_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__ATOMIC_REL(); \
|
|
__atomic_set_##type(p, v, t); \
|
|
} \
|
|
/* _ATOMIC_SET */
|
|
|
|
_ATOMIC_SET(int)
|
|
_ATOMIC_SET(long)
|
|
|
|
#define atomic_set_32 atomic_set_int
|
|
#define atomic_set_acq_32 atomic_set_acq_int
|
|
#define atomic_set_rel_32 atomic_set_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_set_64 atomic_set_long
|
|
#define atomic_set_acq_64 atomic_set_acq_long
|
|
#define atomic_set_rel_64 atomic_set_rel_long
|
|
|
|
#define atomic_set_ptr atomic_set_long
|
|
#define atomic_set_acq_ptr atomic_set_acq_long
|
|
#define atomic_set_rel_ptr atomic_set_rel_long
|
|
#else
|
|
#define atomic_set_ptr atomic_set_int
|
|
#define atomic_set_acq_ptr atomic_set_acq_int
|
|
#define atomic_set_rel_ptr atomic_set_rel_int
|
|
#endif
|
|
#undef _ATOMIC_SET
|
|
#undef __atomic_set_long
|
|
#undef __atomic_set_int
|
|
|
|
/*
|
|
* atomic_subtract(p, v)
|
|
* { *p -= v; }
|
|
*/
|
|
|
|
#define __atomic_subtract_int(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" subf %0, %3, %0\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_subtract_int */
|
|
|
|
#ifdef __powerpc64__
|
|
#define __atomic_subtract_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: ldarx %0, 0, %2\n" \
|
|
" subf %0, %3, %0\n" \
|
|
" stdcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_subtract_long */
|
|
#else
|
|
#define __atomic_subtract_long(p, v, t) \
|
|
__asm __volatile( \
|
|
"1: lwarx %0, 0, %2\n" \
|
|
" subf %0, %3, %0\n" \
|
|
" stwcx. %0, 0, %2\n" \
|
|
" bne- 1b\n" \
|
|
: "=&r" (t), "=m" (*p) \
|
|
: "r" (p), "r" (v), "m" (*p) \
|
|
: "cr0", "memory") \
|
|
/* __atomic_subtract_long */
|
|
#endif
|
|
|
|
#define _ATOMIC_SUBTRACT(type) \
|
|
static __inline void \
|
|
atomic_subtract_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_subtract_##type(p, v, t); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_subtract_acq_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__atomic_subtract_##type(p, v, t); \
|
|
__ATOMIC_ACQ(); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_subtract_rel_##type(volatile u_##type *p, u_##type v) { \
|
|
u_##type t; \
|
|
__ATOMIC_REL(); \
|
|
__atomic_subtract_##type(p, v, t); \
|
|
} \
|
|
/* _ATOMIC_SUBTRACT */
|
|
|
|
_ATOMIC_SUBTRACT(int)
|
|
_ATOMIC_SUBTRACT(long)
|
|
|
|
#define atomic_subtract_32 atomic_subtract_int
|
|
#define atomic_subtract_acq_32 atomic_subtract_acq_int
|
|
#define atomic_subtract_rel_32 atomic_subtract_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_subtract_64 atomic_subtract_long
|
|
#define atomic_subtract_acq_64 atomic_subract_acq_long
|
|
#define atomic_subtract_rel_64 atomic_subtract_rel_long
|
|
|
|
#define atomic_subtract_ptr atomic_subtract_long
|
|
#define atomic_subtract_acq_ptr atomic_subtract_acq_long
|
|
#define atomic_subtract_rel_ptr atomic_subtract_rel_long
|
|
#else
|
|
#define atomic_subtract_ptr atomic_subtract_int
|
|
#define atomic_subtract_acq_ptr atomic_subtract_acq_int
|
|
#define atomic_subtract_rel_ptr atomic_subtract_rel_int
|
|
#endif
|
|
#undef _ATOMIC_SUBTRACT
|
|
#undef __atomic_subtract_long
|
|
#undef __atomic_subtract_int
|
|
|
|
/*
|
|
* atomic_store_rel(p, v)
|
|
*/
|
|
/* TODO -- see below */
|
|
|
|
/*
|
|
* Old/original implementations that still need revisiting.
|
|
*/
|
|
|
|
static __inline u_int
|
|
atomic_readandclear_int(volatile u_int *addr)
|
|
{
|
|
u_int result,temp;
|
|
|
|
__asm __volatile (
|
|
"\tsync\n" /* drain writes */
|
|
"1:\tlwarx %0, 0, %3\n\t" /* load old value */
|
|
"li %1, 0\n\t" /* load new value */
|
|
"stwcx. %1, 0, %3\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
: "=&r"(result), "=&r"(temp), "=m" (*addr)
|
|
: "r" (addr), "m" (*addr)
|
|
: "cr0", "memory");
|
|
|
|
return (result);
|
|
}
|
|
|
|
#ifdef __powerpc64__
|
|
static __inline u_long
|
|
atomic_readandclear_long(volatile u_long *addr)
|
|
{
|
|
u_long result,temp;
|
|
|
|
__asm __volatile (
|
|
"\tsync\n" /* drain writes */
|
|
"1:\tldarx %0, 0, %3\n\t" /* load old value */
|
|
"li %1, 0\n\t" /* load new value */
|
|
"stdcx. %1, 0, %3\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
: "=&r"(result), "=&r"(temp), "=m" (*addr)
|
|
: "r" (addr), "m" (*addr)
|
|
: "cr0", "memory");
|
|
|
|
return (result);
|
|
}
|
|
#endif
|
|
|
|
#define atomic_readandclear_32 atomic_readandclear_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_readandclear_64 atomic_readandclear_long
|
|
|
|
#define atomic_readandclear_ptr atomic_readandclear_long
|
|
#else
|
|
static __inline u_long
|
|
atomic_readandclear_long(volatile u_long *addr)
|
|
{
|
|
|
|
return ((u_long)atomic_readandclear_int((volatile u_int *)addr));
|
|
}
|
|
|
|
#define atomic_readandclear_ptr atomic_readandclear_int
|
|
#endif
|
|
|
|
/*
|
|
* We assume that a = b will do atomic loads and stores.
|
|
*/
|
|
#define ATOMIC_STORE_LOAD(TYPE) \
|
|
static __inline u_##TYPE \
|
|
atomic_load_acq_##TYPE(volatile u_##TYPE *p) \
|
|
{ \
|
|
u_##TYPE v; \
|
|
\
|
|
v = *p; \
|
|
powerpc_lwsync(); \
|
|
return (v); \
|
|
} \
|
|
\
|
|
static __inline void \
|
|
atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) \
|
|
{ \
|
|
\
|
|
powerpc_lwsync(); \
|
|
*p = v; \
|
|
}
|
|
|
|
ATOMIC_STORE_LOAD(int)
|
|
|
|
#define atomic_load_acq_32 atomic_load_acq_int
|
|
#define atomic_store_rel_32 atomic_store_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
ATOMIC_STORE_LOAD(long)
|
|
|
|
#define atomic_load_acq_64 atomic_load_acq_long
|
|
#define atomic_store_rel_64 atomic_store_rel_long
|
|
|
|
#define atomic_load_acq_ptr atomic_load_acq_long
|
|
#define atomic_store_rel_ptr atomic_store_rel_long
|
|
#else
|
|
static __inline u_long
|
|
atomic_load_acq_long(volatile u_long *addr)
|
|
{
|
|
|
|
return ((u_long)atomic_load_acq_int((volatile u_int *)addr));
|
|
}
|
|
|
|
static __inline void
|
|
atomic_store_rel_long(volatile u_long *addr, u_long val)
|
|
{
|
|
|
|
atomic_store_rel_int((volatile u_int *)addr, (u_int)val);
|
|
}
|
|
|
|
#define atomic_load_acq_ptr atomic_load_acq_int
|
|
#define atomic_store_rel_ptr atomic_store_rel_int
|
|
#endif
|
|
#undef ATOMIC_STORE_LOAD
|
|
|
|
/*
|
|
* Atomically compare the value stored at *p with cmpval and if the
|
|
* two values are equal, update the value of *p with newval. Returns
|
|
* zero if the compare failed, nonzero otherwise.
|
|
*/
|
|
#ifdef ISA_206_ATOMICS
|
|
static __inline int
|
|
atomic_cmpset_char(volatile u_char *p, u_char cmpval, u_char newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
"1:\tlbarx %0, 0, %2\n\t" /* load old value */
|
|
"cmplw %3, %0\n\t" /* compare */
|
|
"bne- 2f\n\t" /* exit if not equal */
|
|
"stbcx. %4, 0, %2\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
"stbcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"3:\n\t"
|
|
: "=&r" (ret), "=m" (*p)
|
|
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static __inline int
|
|
atomic_cmpset_short(volatile u_short *p, u_short cmpval, u_short newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
"1:\tlharx %0, 0, %2\n\t" /* load old value */
|
|
"cmplw %3, %0\n\t" /* compare */
|
|
"bne- 2f\n\t" /* exit if not equal */
|
|
"sthcx. %4, 0, %2\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
"sthcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"3:\n\t"
|
|
: "=&r" (ret), "=m" (*p)
|
|
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
#else
|
|
static __inline int
|
|
atomic_cmpset_masked(uint32_t *p, uint32_t cmpval, uint32_t newval,
|
|
uint32_t mask)
|
|
{
|
|
int ret;
|
|
uint32_t tmp;
|
|
|
|
__asm __volatile (
|
|
"1:\tlwarx %2, 0, %2\n\t" /* load old value */
|
|
"and %0, %2, %7\n\t"
|
|
"cmplw %4, %0\n\t" /* compare */
|
|
"bne- 2f\n\t" /* exit if not equal */
|
|
"andc %2, %2, %7\n\t"
|
|
"or %2, %2, %5\n\t"
|
|
"stwcx. %2, 0, %3\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
"stwcx. %2, 0, %3\n\t" /* clear reservation (74xx) */
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"3:\n\t"
|
|
: "=&r" (ret), "=m" (*p), "+&r" (tmp)
|
|
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p),
|
|
"r" (mask)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
|
|
#define _atomic_cmpset_masked_word(a,o,v,m) atomic_cmpset_masked(a, o, v, m)
|
|
#endif
|
|
|
|
static __inline int
|
|
atomic_cmpset_int(volatile u_int* p, u_int cmpval, u_int newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
"1:\tlwarx %0, 0, %2\n\t" /* load old value */
|
|
"cmplw %3, %0\n\t" /* compare */
|
|
"bne- 2f\n\t" /* exit if not equal */
|
|
"stwcx. %4, 0, %2\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"3:\n\t"
|
|
: "=&r" (ret), "=m" (*p)
|
|
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
static __inline int
|
|
atomic_cmpset_long(volatile u_long* p, u_long cmpval, u_long newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
#ifdef __powerpc64__
|
|
"1:\tldarx %0, 0, %2\n\t" /* load old value */
|
|
"cmpld %3, %0\n\t" /* compare */
|
|
"bne- 2f\n\t" /* exit if not equal */
|
|
"stdcx. %4, 0, %2\n\t" /* attempt to store */
|
|
#else
|
|
"1:\tlwarx %0, 0, %2\n\t" /* load old value */
|
|
"cmplw %3, %0\n\t" /* compare */
|
|
"bne- 2f\n\t" /* exit if not equal */
|
|
"stwcx. %4, 0, %2\n\t" /* attempt to store */
|
|
#endif
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
#ifdef __powerpc64__
|
|
"stdcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
#else
|
|
"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
#endif
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"3:\n\t"
|
|
: "=&r" (ret), "=m" (*p)
|
|
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
|
|
#define ATOMIC_CMPSET_ACQ_REL(type) \
|
|
static __inline int \
|
|
atomic_cmpset_acq_##type(volatile u_##type *p, \
|
|
u_##type cmpval, u_##type newval)\
|
|
{\
|
|
u_##type retval; \
|
|
retval = atomic_cmpset_##type(p, cmpval, newval);\
|
|
__ATOMIC_ACQ();\
|
|
return (retval);\
|
|
}\
|
|
static __inline int \
|
|
atomic_cmpset_rel_##type(volatile u_##type *p, \
|
|
u_##type cmpval, u_##type newval)\
|
|
{\
|
|
__ATOMIC_REL();\
|
|
return (atomic_cmpset_##type(p, cmpval, newval));\
|
|
}\
|
|
struct hack
|
|
|
|
ATOMIC_CMPSET_ACQ_REL(int);
|
|
ATOMIC_CMPSET_ACQ_REL(long);
|
|
|
|
|
|
#define atomic_cmpset_8 atomic_cmpset_char
|
|
#define atomic_cmpset_acq_8 atomic_cmpset_acq_char
|
|
#define atomic_cmpset_rel_8 atomic_cmpset_rel_char
|
|
|
|
#define atomic_cmpset_16 atomic_cmpset_short
|
|
#define atomic_cmpset_acq_16 atomic_cmpset_acq_short
|
|
#define atomic_cmpset_rel_16 atomic_cmpset_rel_short
|
|
|
|
#define atomic_cmpset_32 atomic_cmpset_int
|
|
#define atomic_cmpset_acq_32 atomic_cmpset_acq_int
|
|
#define atomic_cmpset_rel_32 atomic_cmpset_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_cmpset_64 atomic_cmpset_long
|
|
#define atomic_cmpset_acq_64 atomic_cmpset_acq_long
|
|
#define atomic_cmpset_rel_64 atomic_cmpset_rel_long
|
|
|
|
#define atomic_cmpset_ptr atomic_cmpset_long
|
|
#define atomic_cmpset_acq_ptr atomic_cmpset_acq_long
|
|
#define atomic_cmpset_rel_ptr atomic_cmpset_rel_long
|
|
#else
|
|
#define atomic_cmpset_ptr atomic_cmpset_int
|
|
#define atomic_cmpset_acq_ptr atomic_cmpset_acq_int
|
|
#define atomic_cmpset_rel_ptr atomic_cmpset_rel_int
|
|
#endif
|
|
|
|
/*
|
|
* Atomically compare the value stored at *p with *cmpval and if the
|
|
* two values are equal, update the value of *p with newval. Returns
|
|
* zero if the compare failed and sets *cmpval to the read value from *p,
|
|
* nonzero otherwise.
|
|
*/
|
|
#ifdef ISA_206_ATOMICS
|
|
static __inline int
|
|
atomic_fcmpset_char(volatile u_char *p, u_char *cmpval, u_char newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
"lbarx %0, 0, %3\n\t" /* load old value */
|
|
"cmplw %4, %0\n\t" /* compare */
|
|
"bne- 1f\n\t" /* exit if not equal */
|
|
"stbcx. %5, 0, %3\n\t" /* attempt to store */
|
|
"bne- 1f\n\t" /* exit if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 2f\n\t" /* we've succeeded */
|
|
"1:\n\t"
|
|
"stbcx. %0, 0, %3\n\t" /* clear reservation (74xx) */
|
|
"stwx %0, 0, %7\n\t"
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"2:\n\t"
|
|
: "=&r" (ret), "=m" (*p), "=m" (*cmpval)
|
|
: "r" (p), "r" (*cmpval), "r" (newval), "m" (*p), "r"(cmpval)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static __inline int
|
|
atomic_fcmpset_short(volatile u_short *p, u_short *cmpval, u_short newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
"lharx %0, 0, %3\n\t" /* load old value */
|
|
"cmplw %4, %0\n\t" /* compare */
|
|
"bne- 1f\n\t" /* exit if not equal */
|
|
"sthcx. %5, 0, %3\n\t" /* attempt to store */
|
|
"bne- 1f\n\t" /* exit if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 2f\n\t" /* we've succeeded */
|
|
"1:\n\t"
|
|
"sthcx. %0, 0, %3\n\t" /* clear reservation (74xx) */
|
|
"stwx %0, 0, %7\n\t"
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"2:\n\t"
|
|
: "=&r" (ret), "=m" (*p), "=m" (*cmpval)
|
|
: "r" (p), "r" (*cmpval), "r" (newval), "m" (*p), "r"(cmpval)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
#endif /* ISA_206_ATOMICS */
|
|
|
|
static __inline int
|
|
atomic_fcmpset_int(volatile u_int *p, u_int *cmpval, u_int newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
"lwarx %0, 0, %3\n\t" /* load old value */
|
|
"cmplw %4, %0\n\t" /* compare */
|
|
"bne- 1f\n\t" /* exit if not equal */
|
|
"stwcx. %5, 0, %3\n\t" /* attempt to store */
|
|
"bne- 1f\n\t" /* exit if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 2f\n\t" /* we've succeeded */
|
|
"1:\n\t"
|
|
"stwcx. %0, 0, %3\n\t" /* clear reservation (74xx) */
|
|
"stwx %0, 0, %7\n\t"
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"2:\n\t"
|
|
: "=&r" (ret), "=m" (*p), "=m" (*cmpval)
|
|
: "r" (p), "r" (*cmpval), "r" (newval), "m" (*p), "r"(cmpval)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
static __inline int
|
|
atomic_fcmpset_long(volatile u_long *p, u_long *cmpval, u_long newval)
|
|
{
|
|
int ret;
|
|
|
|
__asm __volatile (
|
|
#ifdef __powerpc64__
|
|
"ldarx %0, 0, %3\n\t" /* load old value */
|
|
"cmpld %4, %0\n\t" /* compare */
|
|
"bne- 1f\n\t" /* exit if not equal */
|
|
"stdcx. %5, 0, %3\n\t" /* attempt to store */
|
|
#else
|
|
"lwarx %0, 0, %3\n\t" /* load old value */
|
|
"cmplw %4, %0\n\t" /* compare */
|
|
"bne- 1f\n\t" /* exit if not equal */
|
|
"stwcx. %5, 0, %3\n\t" /* attempt to store */
|
|
#endif
|
|
"bne- 1f\n\t" /* exit if failed */
|
|
"li %0, 1\n\t" /* success - retval = 1 */
|
|
"b 2f\n\t" /* we've succeeded */
|
|
"1:\n\t"
|
|
#ifdef __powerpc64__
|
|
"stdcx. %0, 0, %3\n\t" /* clear reservation (74xx) */
|
|
"stdx %0, 0, %7\n\t"
|
|
#else
|
|
"stwcx. %0, 0, %3\n\t" /* clear reservation (74xx) */
|
|
"stwx %0, 0, %7\n\t"
|
|
#endif
|
|
"li %0, 0\n\t" /* failure - retval = 0 */
|
|
"2:\n\t"
|
|
: "=&r" (ret), "=m" (*p), "=m" (*cmpval)
|
|
: "r" (p), "r" (*cmpval), "r" (newval), "m" (*p), "r"(cmpval)
|
|
: "cr0", "memory");
|
|
|
|
return (ret);
|
|
}
|
|
|
|
#define ATOMIC_FCMPSET_ACQ_REL(type) \
|
|
static __inline int \
|
|
atomic_fcmpset_acq_##type(volatile u_##type *p, \
|
|
u_##type *cmpval, u_##type newval)\
|
|
{\
|
|
u_##type retval; \
|
|
retval = atomic_fcmpset_##type(p, cmpval, newval);\
|
|
__ATOMIC_ACQ();\
|
|
return (retval);\
|
|
}\
|
|
static __inline int \
|
|
atomic_fcmpset_rel_##type(volatile u_##type *p, \
|
|
u_##type *cmpval, u_##type newval)\
|
|
{\
|
|
__ATOMIC_REL();\
|
|
return (atomic_fcmpset_##type(p, cmpval, newval));\
|
|
}\
|
|
struct hack
|
|
|
|
ATOMIC_FCMPSET_ACQ_REL(int);
|
|
ATOMIC_FCMPSET_ACQ_REL(long);
|
|
|
|
#define atomic_fcmpset_8 atomic_fcmpset_char
|
|
#define atomic_fcmpset_acq_8 atomic_fcmpset_acq_char
|
|
#define atomic_fcmpset_rel_8 atomic_fcmpset_rel_char
|
|
|
|
#define atomic_fcmpset_16 atomic_fcmpset_short
|
|
#define atomic_fcmpset_acq_16 atomic_fcmpset_acq_short
|
|
#define atomic_fcmpset_rel_16 atomic_fcmpset_rel_short
|
|
|
|
#define atomic_fcmpset_32 atomic_fcmpset_int
|
|
#define atomic_fcmpset_acq_32 atomic_fcmpset_acq_int
|
|
#define atomic_fcmpset_rel_32 atomic_fcmpset_rel_int
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_fcmpset_64 atomic_fcmpset_long
|
|
#define atomic_fcmpset_acq_64 atomic_fcmpset_acq_long
|
|
#define atomic_fcmpset_rel_64 atomic_fcmpset_rel_long
|
|
|
|
#define atomic_fcmpset_ptr atomic_fcmpset_long
|
|
#define atomic_fcmpset_acq_ptr atomic_fcmpset_acq_long
|
|
#define atomic_fcmpset_rel_ptr atomic_fcmpset_rel_long
|
|
#else
|
|
#define atomic_fcmpset_ptr atomic_fcmpset_int
|
|
#define atomic_fcmpset_acq_ptr atomic_fcmpset_acq_int
|
|
#define atomic_fcmpset_rel_ptr atomic_fcmpset_rel_int
|
|
#endif
|
|
|
|
static __inline u_int
|
|
atomic_fetchadd_int(volatile u_int *p, u_int v)
|
|
{
|
|
u_int value;
|
|
|
|
do {
|
|
value = *p;
|
|
} while (!atomic_cmpset_int(p, value, value + v));
|
|
return (value);
|
|
}
|
|
|
|
static __inline u_long
|
|
atomic_fetchadd_long(volatile u_long *p, u_long v)
|
|
{
|
|
u_long value;
|
|
|
|
do {
|
|
value = *p;
|
|
} while (!atomic_cmpset_long(p, value, value + v));
|
|
return (value);
|
|
}
|
|
|
|
static __inline u_int
|
|
atomic_swap_32(volatile u_int *p, u_int v)
|
|
{
|
|
u_int prev;
|
|
|
|
__asm __volatile(
|
|
"1: lwarx %0,0,%2\n"
|
|
" stwcx. %3,0,%2\n"
|
|
" bne- 1b\n"
|
|
: "=&r" (prev), "+m" (*(volatile u_int *)p)
|
|
: "r" (p), "r" (v)
|
|
: "cr0", "memory");
|
|
|
|
return (prev);
|
|
}
|
|
|
|
#ifdef __powerpc64__
|
|
static __inline u_long
|
|
atomic_swap_64(volatile u_long *p, u_long v)
|
|
{
|
|
u_long prev;
|
|
|
|
__asm __volatile(
|
|
"1: ldarx %0,0,%2\n"
|
|
" stdcx. %3,0,%2\n"
|
|
" bne- 1b\n"
|
|
: "=&r" (prev), "+m" (*(volatile u_long *)p)
|
|
: "r" (p), "r" (v)
|
|
: "cr0", "memory");
|
|
|
|
return (prev);
|
|
}
|
|
#endif
|
|
|
|
#define atomic_fetchadd_32 atomic_fetchadd_int
|
|
#define atomic_swap_int atomic_swap_32
|
|
|
|
#ifdef __powerpc64__
|
|
#define atomic_fetchadd_64 atomic_fetchadd_long
|
|
#define atomic_swap_long atomic_swap_64
|
|
#define atomic_swap_ptr atomic_swap_64
|
|
#else
|
|
#define atomic_swap_long(p,v) atomic_swap_32((volatile u_int *)(p), v)
|
|
#define atomic_swap_ptr(p,v) atomic_swap_32((volatile u_int *)(p), v)
|
|
#endif
|
|
|
|
static __inline void
|
|
atomic_thread_fence_acq(void)
|
|
{
|
|
|
|
powerpc_lwsync();
|
|
}
|
|
|
|
static __inline void
|
|
atomic_thread_fence_rel(void)
|
|
{
|
|
|
|
powerpc_lwsync();
|
|
}
|
|
|
|
static __inline void
|
|
atomic_thread_fence_acq_rel(void)
|
|
{
|
|
|
|
powerpc_lwsync();
|
|
}
|
|
|
|
static __inline void
|
|
atomic_thread_fence_seq_cst(void)
|
|
{
|
|
|
|
__asm __volatile("sync" : : : "memory");
|
|
}
|
|
|
|
#ifndef ISA_206_ATOMICS
|
|
#include <sys/_atomic_subword.h>
|
|
#endif
|
|
|
|
/* These need sys/_atomic_subword.h on non-ISA-2.06-atomic platforms. */
|
|
ATOMIC_CMPSET_ACQ_REL(char);
|
|
ATOMIC_CMPSET_ACQ_REL(short);
|
|
|
|
ATOMIC_FCMPSET_ACQ_REL(char);
|
|
ATOMIC_FCMPSET_ACQ_REL(short);
|
|
|
|
#undef __ATOMIC_REL
|
|
#undef __ATOMIC_ACQ
|
|
|
|
#endif /* ! _MACHINE_ATOMIC_H_ */
|