e544d50473
New fixup code. New common SPL code. New common interrupt code. Move related variables into structures. Cleanup locore (move MD variable into it). Kill StudlyCaps Use PCU for FPU
192 lines
4.2 KiB
C
192 lines
4.2 KiB
C
/* $NetBSD: lock.h,v 1.18 2011/02/20 07:45:47 matt Exp $ */
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/*-
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* Copyright (c) 2001, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Wayne Knowles and Andrew Doran.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Machine-dependent spin lock operations for MIPS processors.
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*
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* Note: R2000/R3000 doesn't have any atomic update instructions; this
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* will cause problems for user applications using this header.
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*/
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#ifndef _MIPS_LOCK_H_
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#define _MIPS_LOCK_H_
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#include <sys/param.h>
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static __inline int
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__SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr)
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{
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return *__ptr != __SIMPLELOCK_UNLOCKED;
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}
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static __inline int
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__SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr)
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{
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return *__ptr == __SIMPLELOCK_UNLOCKED;
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}
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static __inline void
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__cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
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{
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*__ptr = __SIMPLELOCK_UNLOCKED;
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}
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static __inline void
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__cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
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{
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*__ptr = __SIMPLELOCK_LOCKED;
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}
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#ifndef _HARDKERNEL
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static __inline int
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__cpu_simple_lock_try(__cpu_simple_lock_t *lp)
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{
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unsigned long t0, v0;
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__asm volatile(
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"# -- BEGIN __cpu_simple_lock_try\n"
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" .set push \n"
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" .set mips2 \n"
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"1: ll %0, %4 \n"
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" bnez %0, 2f \n"
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" nop # BDslot \n"
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" li %0, %3 \n"
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" sc %0, %2 \n"
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" beqz %0, 2f \n"
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" nop # BDslot \n"
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" li %1, 1 \n"
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" sync \n"
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" j 3f \n"
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" nop \n"
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" nop \n"
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"2: li %1, 0 \n"
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"3: \n"
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" .set pop \n"
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"# -- END __cpu_simple_lock_try \n"
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: "=r" (t0), "=r" (v0), "+m" (*lp)
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: "i" (__SIMPLELOCK_LOCKED), "m" (*lp));
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return (v0 != 0);
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}
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#ifdef MIPS1
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static __inline void
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mb_read(void)
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{
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__insn_barrier();
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}
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static __inline void
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mb_write(void)
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{
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__insn_barrier();
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}
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static __inline void
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mb_memory(void)
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{
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__insn_barrier();
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}
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#else /* MIPS1*/
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static __inline void
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mb_read(void)
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{
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__asm volatile(
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" .set push\n"
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" .set mips2\n"
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" sync\n"
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" .set pop"
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::: "memory"
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);
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}
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static __inline void
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mb_write(void)
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{
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mb_read();
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}
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static __inline void
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mb_memory(void)
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{
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mb_read();
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}
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#endif /* MIPS1 */
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#else /* !_HARDKERNEL */
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u_int _atomic_cas_uint(volatile u_int *, u_int, u_int);
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u_long _atomic_cas_ulong(volatile u_long *, u_long, u_long);
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void * _atomic_cas_ptr(volatile void *, void *, void *);
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void mb_read(void);
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void mb_write(void);
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void mb_memory(void);
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static __inline int
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__cpu_simple_lock_try(__cpu_simple_lock_t *lp)
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{
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return _atomic_cas_uint(lp,
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__SIMPLELOCK_UNLOCKED, __SIMPLELOCK_LOCKED) ==
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__SIMPLELOCK_UNLOCKED;
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}
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#endif /* _HARDKERNEL */
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static __inline void
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__cpu_simple_lock_init(__cpu_simple_lock_t *lp)
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{
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*lp = __SIMPLELOCK_UNLOCKED;
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mb_memory();
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}
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static __inline void
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__cpu_simple_lock(__cpu_simple_lock_t *lp)
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{
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while (!__cpu_simple_lock_try(lp)) {
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while (*lp == __SIMPLELOCK_LOCKED)
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/* spin */;
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}
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}
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static __inline void
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__cpu_simple_unlock(__cpu_simple_lock_t *lp)
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{
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mb_memory();
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*lp = __SIMPLELOCK_UNLOCKED;
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}
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#endif /* _MIPS_LOCK_H_ */
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