ca0ec73c11
The goal of this change is to make the atomic_load_acq_{8,16},
atomic_testandset{,_acq}_long, and atomic_testandclear_long primitives
available in MI-namespace.
The second goal is to get this draft out of my local tree, as anything that
requires a full tinderbox is a big burden out of tree. MD specifics can be
refined individually afterwards.
The generic implementations may not be ideal for your architecture; feel
free to implement better versions. If no subword_atomic definitions are
needed, the include can be removed from your arch's machine/atomic.h.
Generic definitions are guarded by defined macros of the same name. To
avoid picking up conflicting generic definitions, some macro defines are
added to various MD machine/atomic.h to register an existing implementation.
Include _atomic_subword.h in arm and arm64 machine/atomic.h.
For some odd reason, KCSAN only generates some versions of primitives.
Generate the _acq variants of atomic_load.*_8, atomic_load.*_16, and
atomic_testandset.*_long. There are other questionably disabled primitives,
but I didn't run into them, so I left them alone. KCSAN is only built for
amd64 in tinderbox for now.
Add atomic_subword implementations of atomic_load_acq_{8,16} implemented
using masking and atomic_load_acq_32.
Add generic atomic_subword implementations of atomic_testandset_long(),
atomic_testandclear_long(), and atomic_testandset_acq_long(), using
atomic_fcmpset_long() and atomic_fcmpset_acq_long().
On x86, add atomic_testandset_acq_long as an alias for
atomic_testandset_long.
Reviewed by: kevans, rlibby (previous versions both)
Differential Revision: https://reviews.freebsd.org/D22963
663 lines
15 KiB
C
663 lines
15 KiB
C
/* $NetBSD: atomic.h,v 1.1 2002/10/19 12:22:34 bsh Exp $ */
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/*-
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* Copyright (C) 2003-2004 Olivier Houchard
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* Copyright (C) 1994-1997 Mark Brinicombe
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* Copyright (C) 1994 Brini
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of Brini may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ATOMIC_V4_H_
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#define _MACHINE_ATOMIC_V4_H_
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#ifndef _MACHINE_ATOMIC_H_
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#error Do not include this file directly, use <machine/atomic.h>
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#endif
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#if __ARM_ARCH <= 5
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#define isb() __asm __volatile("mcr p15, 0, %0, c7, c5, 4" : : "r" (0) : "memory")
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#define dsb() __asm __volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (0) : "memory")
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#define dmb() dsb()
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#else
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#error Only use this file with ARMv5 and earlier
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#endif
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#define mb() dmb()
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#define wmb() dmb()
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#define rmb() dmb()
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#define __with_interrupts_disabled(expr) \
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do { \
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u_int cpsr_save, tmp; \
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\
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__asm __volatile( \
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"mrs %0, cpsr;" \
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"orr %1, %0, %2;" \
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"msr cpsr_fsxc, %1;" \
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: "=r" (cpsr_save), "=r" (tmp) \
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: "I" (PSR_I | PSR_F) \
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: "cc" ); \
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(expr); \
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__asm __volatile( \
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"msr cpsr_fsxc, %0" \
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: /* no output */ \
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: "r" (cpsr_save) \
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: "cc" ); \
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} while(0)
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static __inline uint32_t
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__swp(uint32_t val, volatile uint32_t *ptr)
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{
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__asm __volatile("swp %0, %2, [%3]"
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: "=&r" (val), "=m" (*ptr)
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: "r" (val), "r" (ptr), "m" (*ptr)
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: "memory");
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return (val);
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}
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#ifdef _KERNEL
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#define ARM_HAVE_ATOMIC64
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static __inline void
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atomic_add_32(volatile u_int32_t *p, u_int32_t val)
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{
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__with_interrupts_disabled(*p += val);
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}
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static __inline void
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atomic_add_64(volatile u_int64_t *p, u_int64_t val)
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{
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__with_interrupts_disabled(*p += val);
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}
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static __inline void
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atomic_clear_32(volatile uint32_t *address, uint32_t clearmask)
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{
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__with_interrupts_disabled(*address &= ~clearmask);
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}
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static __inline void
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atomic_clear_64(volatile uint64_t *address, uint64_t clearmask)
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{
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__with_interrupts_disabled(*address &= ~clearmask);
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}
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static __inline int
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atomic_fcmpset_8(volatile uint8_t *p, volatile uint8_t *cmpval, volatile uint8_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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ret = *p;
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if (*p == *cmpval) {
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*p = newval;
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ret = 1;
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} else {
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*cmpval = *p;
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_fcmpset_16(volatile uint16_t *p, volatile uint16_t *cmpval, volatile uint16_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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ret = *p;
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if (*p == *cmpval) {
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*p = newval;
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ret = 1;
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} else {
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*cmpval = *p;
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_fcmpset_32(volatile u_int32_t *p, volatile u_int32_t *cmpval, volatile u_int32_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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ret = *p;
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if (*p == *cmpval) {
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*p = newval;
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ret = 1;
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} else {
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*cmpval = *p;
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_fcmpset_64(volatile u_int64_t *p, volatile u_int64_t *cmpval, volatile u_int64_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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if (*p == *cmpval) {
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*p = newval;
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ret = 1;
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} else {
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*cmpval = *p;
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_cmpset_8(volatile uint8_t *p, volatile uint8_t cmpval, volatile uint8_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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if (*p == cmpval) {
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*p = newval;
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ret = 1;
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} else {
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_cmpset_16(volatile uint16_t *p, volatile uint16_t cmpval, volatile uint16_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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if (*p == cmpval) {
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*p = newval;
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ret = 1;
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} else {
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_cmpset_32(volatile u_int32_t *p, volatile u_int32_t cmpval, volatile u_int32_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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if (*p == cmpval) {
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*p = newval;
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ret = 1;
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} else {
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline int
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atomic_cmpset_64(volatile u_int64_t *p, volatile u_int64_t cmpval, volatile u_int64_t newval)
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{
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int ret;
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__with_interrupts_disabled(
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{
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if (*p == cmpval) {
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*p = newval;
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ret = 1;
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} else {
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ret = 0;
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}
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});
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return (ret);
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}
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static __inline uint32_t
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atomic_fetchadd_32(volatile uint32_t *p, uint32_t v)
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{
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uint32_t value;
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__with_interrupts_disabled(
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{
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value = *p;
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*p += v;
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});
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return (value);
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}
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static __inline uint64_t
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atomic_fetchadd_64(volatile uint64_t *p, uint64_t v)
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{
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uint64_t value;
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__with_interrupts_disabled(
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{
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value = *p;
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*p += v;
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});
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return (value);
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}
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static __inline uint64_t
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atomic_load_64(volatile uint64_t *p)
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{
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uint64_t value;
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__with_interrupts_disabled(value = *p);
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return (value);
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}
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static __inline void
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atomic_set_32(volatile uint32_t *address, uint32_t setmask)
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{
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__with_interrupts_disabled(*address |= setmask);
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}
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static __inline void
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atomic_set_64(volatile uint64_t *address, uint64_t setmask)
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{
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__with_interrupts_disabled(*address |= setmask);
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}
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static __inline void
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atomic_store_64(volatile uint64_t *p, uint64_t value)
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{
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__with_interrupts_disabled(*p = value);
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}
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static __inline void
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atomic_subtract_32(volatile u_int32_t *p, u_int32_t val)
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{
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__with_interrupts_disabled(*p -= val);
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}
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static __inline void
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atomic_subtract_64(volatile u_int64_t *p, u_int64_t val)
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{
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__with_interrupts_disabled(*p -= val);
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}
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static __inline uint64_t
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atomic_swap_64(volatile uint64_t *p, uint64_t v)
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{
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uint64_t value;
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__with_interrupts_disabled(
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{
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value = *p;
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*p = v;
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});
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return (value);
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}
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#else /* !_KERNEL */
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static __inline void
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atomic_add_32(volatile u_int32_t *p, u_int32_t val)
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{
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int start, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%2]\n"
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"add %1, %1, %3\n"
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"str %1, [%2]\n"
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"2:\n"
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"mov %1, #0\n"
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"str %1, [%0]\n"
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"mov %1, #0xffffffff\n"
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"str %1, [%0, #4]\n"
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: "+r" (ras_start), "=r" (start), "+r" (p), "+r" (val)
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: : "memory");
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}
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static __inline void
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atomic_clear_32(volatile uint32_t *address, uint32_t clearmask)
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{
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int start, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%2]\n"
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"bic %1, %1, %3\n"
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"str %1, [%2]\n"
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"2:\n"
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"mov %1, #0\n"
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"str %1, [%0]\n"
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"mov %1, #0xffffffff\n"
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"str %1, [%0, #4]\n"
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: "+r" (ras_start), "=r" (start), "+r" (address), "+r" (clearmask)
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: : "memory");
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}
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static __inline int
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atomic_cmpset_32(volatile u_int32_t *p, volatile u_int32_t cmpval, volatile u_int32_t newval)
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{
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int done, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%2]\n"
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"cmp %1, %3\n"
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"streq %4, [%2]\n"
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"2:\n"
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"mov %1, #0\n"
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"str %1, [%0]\n"
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"mov %1, #0xffffffff\n"
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"str %1, [%0, #4]\n"
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"moveq %1, #1\n"
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"movne %1, #0\n"
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: "+r" (ras_start), "=r" (done)
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,"+r" (p), "+r" (cmpval), "+r" (newval) : : "cc", "memory");
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return (done);
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}
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static __inline int
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atomic_fcmpset_32(volatile u_int32_t *p, volatile u_int32_t *cmpval, volatile u_int32_t newval)
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{
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int done, oldval, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%2]\n"
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"ldr %5, [%3]\n"
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"cmp %1, %5\n"
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"streq %4, [%2]\n"
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"2:\n"
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"mov %5, #0\n"
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"str %5, [%0]\n"
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"mov %5, #0xffffffff\n"
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"str %5, [%0, #4]\n"
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"strne %1, [%3]\n"
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"moveq %1, #1\n"
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"movne %1, #0\n"
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: "+r" (ras_start), "=r" (done) ,"+r" (p)
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, "+r" (cmpval), "+r" (newval), "+r" (oldval) : : "cc", "memory");
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return (done);
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}
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static __inline uint32_t
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atomic_fetchadd_32(volatile uint32_t *p, uint32_t v)
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{
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uint32_t start, tmp, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%3]\n"
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"mov %2, %1\n"
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"add %2, %2, %4\n"
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"str %2, [%3]\n"
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"2:\n"
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"mov %2, #0\n"
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"str %2, [%0]\n"
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"mov %2, #0xffffffff\n"
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"str %2, [%0, #4]\n"
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: "+r" (ras_start), "=r" (start), "=r" (tmp), "+r" (p), "+r" (v)
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: : "memory");
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return (start);
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}
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static __inline void
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atomic_set_32(volatile uint32_t *address, uint32_t setmask)
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{
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int start, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%2]\n"
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"orr %1, %1, %3\n"
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"str %1, [%2]\n"
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"2:\n"
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"mov %1, #0\n"
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"str %1, [%0]\n"
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"mov %1, #0xffffffff\n"
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"str %1, [%0, #4]\n"
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: "+r" (ras_start), "=r" (start), "+r" (address), "+r" (setmask)
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: : "memory");
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}
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static __inline void
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atomic_subtract_32(volatile u_int32_t *p, u_int32_t val)
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{
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int start, ras_start = ARM_RAS_START;
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__asm __volatile("1:\n"
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"adr %1, 1b\n"
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"str %1, [%0]\n"
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"adr %1, 2f\n"
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"str %1, [%0, #4]\n"
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"ldr %1, [%2]\n"
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"sub %1, %1, %3\n"
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"str %1, [%2]\n"
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"2:\n"
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"mov %1, #0\n"
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|
"str %1, [%0]\n"
|
|
"mov %1, #0xffffffff\n"
|
|
"str %1, [%0, #4]\n"
|
|
|
|
: "+r" (ras_start), "=r" (start), "+r" (p), "+r" (val)
|
|
: : "memory");
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
static __inline uint32_t
|
|
atomic_readandclear_32(volatile u_int32_t *p)
|
|
{
|
|
|
|
return (__swp(0, p));
|
|
}
|
|
|
|
static __inline uint32_t
|
|
atomic_swap_32(volatile u_int32_t *p, u_int32_t v)
|
|
{
|
|
|
|
return (__swp(v, p));
|
|
}
|
|
|
|
#define atomic_fcmpset_rel_32 atomic_fcmpset_32
|
|
#define atomic_fcmpset_acq_32 atomic_fcmpset_32
|
|
#ifdef _KERNEL
|
|
#define atomic_fcmpset_8 atomic_fcmpset_8
|
|
#define atomic_fcmpset_rel_8 atomic_fcmpset_8
|
|
#define atomic_fcmpset_acq_8 atomic_fcmpset_8
|
|
#define atomic_fcmpset_16 atomic_fcmpset_16
|
|
#define atomic_fcmpset_rel_16 atomic_fcmpset_16
|
|
#define atomic_fcmpset_acq_16 atomic_fcmpset_16
|
|
#define atomic_fcmpset_rel_64 atomic_fcmpset_64
|
|
#define atomic_fcmpset_acq_64 atomic_fcmpset_64
|
|
#endif
|
|
#define atomic_fcmpset_acq_long atomic_fcmpset_long
|
|
#define atomic_fcmpset_rel_long atomic_fcmpset_long
|
|
#define atomic_cmpset_rel_32 atomic_cmpset_32
|
|
#define atomic_cmpset_acq_32 atomic_cmpset_32
|
|
#ifdef _KERNEL
|
|
#define atomic_cmpset_8 atomic_cmpset_8
|
|
#define atomic_cmpset_rel_8 atomic_cmpset_8
|
|
#define atomic_cmpset_acq_8 atomic_cmpset_8
|
|
#define atomic_cmpset_16 atomic_cmpset_16
|
|
#define atomic_cmpset_rel_16 atomic_cmpset_16
|
|
#define atomic_cmpset_acq_16 atomic_cmpset_16
|
|
#define atomic_cmpset_rel_64 atomic_cmpset_64
|
|
#define atomic_cmpset_acq_64 atomic_cmpset_64
|
|
#endif
|
|
#define atomic_set_rel_32 atomic_set_32
|
|
#define atomic_set_acq_32 atomic_set_32
|
|
#define atomic_clear_rel_32 atomic_clear_32
|
|
#define atomic_clear_acq_32 atomic_clear_32
|
|
#define atomic_add_rel_32 atomic_add_32
|
|
#define atomic_add_acq_32 atomic_add_32
|
|
#define atomic_subtract_rel_32 atomic_subtract_32
|
|
#define atomic_subtract_acq_32 atomic_subtract_32
|
|
#define atomic_store_rel_32 atomic_store_32
|
|
#define atomic_store_rel_long atomic_store_long
|
|
#define atomic_load_acq_32 atomic_load_32
|
|
#define atomic_load_acq_long atomic_load_long
|
|
#define atomic_add_acq_long atomic_add_long
|
|
#define atomic_add_rel_long atomic_add_long
|
|
#define atomic_subtract_acq_long atomic_subtract_long
|
|
#define atomic_subtract_rel_long atomic_subtract_long
|
|
#define atomic_clear_acq_long atomic_clear_long
|
|
#define atomic_clear_rel_long atomic_clear_long
|
|
#define atomic_set_acq_long atomic_set_long
|
|
#define atomic_set_rel_long atomic_set_long
|
|
#define atomic_cmpset_acq_long atomic_cmpset_long
|
|
#define atomic_cmpset_rel_long atomic_cmpset_long
|
|
#define atomic_load_acq_long atomic_load_long
|
|
#undef __with_interrupts_disabled
|
|
|
|
static __inline void
|
|
atomic_add_long(volatile u_long *p, u_long v)
|
|
{
|
|
|
|
atomic_add_32((volatile uint32_t *)p, v);
|
|
}
|
|
|
|
static __inline void
|
|
atomic_clear_long(volatile u_long *p, u_long v)
|
|
{
|
|
|
|
atomic_clear_32((volatile uint32_t *)p, v);
|
|
}
|
|
|
|
static __inline int
|
|
atomic_cmpset_long(volatile u_long *dst, u_long old, u_long newe)
|
|
{
|
|
|
|
return (atomic_cmpset_32((volatile uint32_t *)dst, old, newe));
|
|
}
|
|
|
|
static __inline u_long
|
|
atomic_fcmpset_long(volatile u_long *dst, u_long *old, u_long newe)
|
|
{
|
|
|
|
return (atomic_fcmpset_32((volatile uint32_t *)dst,
|
|
(uint32_t *)old, newe));
|
|
}
|
|
|
|
static __inline u_long
|
|
atomic_fetchadd_long(volatile u_long *p, u_long v)
|
|
{
|
|
|
|
return (atomic_fetchadd_32((volatile uint32_t *)p, v));
|
|
}
|
|
|
|
static __inline void
|
|
atomic_readandclear_long(volatile u_long *p)
|
|
{
|
|
|
|
atomic_readandclear_32((volatile uint32_t *)p);
|
|
}
|
|
|
|
static __inline void
|
|
atomic_set_long(volatile u_long *p, u_long v)
|
|
{
|
|
|
|
atomic_set_32((volatile uint32_t *)p, v);
|
|
}
|
|
|
|
static __inline void
|
|
atomic_subtract_long(volatile u_long *p, u_long v)
|
|
{
|
|
|
|
atomic_subtract_32((volatile uint32_t *)p, v);
|
|
}
|
|
|
|
/*
|
|
* ARMv5 does not support SMP. For both kernel and user modes, only a
|
|
* compiler barrier is needed for fences, since CPU is always
|
|
* self-consistent.
|
|
*/
|
|
static __inline void
|
|
atomic_thread_fence_acq(void)
|
|
{
|
|
|
|
__compiler_membar();
|
|
}
|
|
|
|
static __inline void
|
|
atomic_thread_fence_rel(void)
|
|
{
|
|
|
|
__compiler_membar();
|
|
}
|
|
|
|
static __inline void
|
|
atomic_thread_fence_acq_rel(void)
|
|
{
|
|
|
|
__compiler_membar();
|
|
}
|
|
|
|
static __inline void
|
|
atomic_thread_fence_seq_cst(void)
|
|
{
|
|
|
|
__compiler_membar();
|
|
}
|
|
|
|
#endif /* _MACHINE_ATOMIC_H_ */
|