319 lines
9.3 KiB
C
319 lines
9.3 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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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. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MUTEX_H_
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#define _MACHINE_MUTEX_H_
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#ifndef LOCORE
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#ifdef _KERNEL
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#include <machine/psl.h>
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/* Global locks */
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extern struct mtx clock_lock;
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#define mtx_legal2block() (read_eflags() & PSL_I)
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#define mtx_intr_enable(mutex) (mutex)->mtx_saveintr |= PSL_I
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/*
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* Assembly macros (for internal use only)
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*------------------------------------------------------------------------------
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*/
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#define _V(x) __STRING(x)
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#if 0
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/* #ifndef I386_CPU */
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/*
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* For 486 and newer processors.
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*/
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/* Get a sleep lock, deal with recursion inline. */
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#define _getlock_sleep(mtxp, tid, type) ({ \
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int _res = MTX_UNOWNED; \
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\
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__asm __volatile ( \
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" " MPLOCKED "" \
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" cmpxchgl %3,%1;" /* Try */ \
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" jz 1f;" /* Got it */ \
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" andl $" _V(MTX_FLAGMASK) ",%0;" /* turn off spec bits */ \
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" cmpl %0,%3;" /* already have it? */ \
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" je 2f;" /* yes, recurse */ \
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" pushl %4;" \
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" pushl %5;" \
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" call mtx_enter_hard;" \
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" addl $8,%%esp;" \
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" jmp 1f;" \
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"2:" \
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" " MPLOCKED "" \
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" orl $" _V(MTX_RECURSE) ",%1;" \
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" incl %2;" \
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"1:" \
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"# getlock_sleep" \
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: "+a" (_res), /* 0 */ \
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"+m" (mtxp->mtx_lock), /* 1 */ \
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"+m" (mtxp->mtx_recurse) /* 2 */ \
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: "r" (tid), /* 3 (input) */ \
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"gi" (type), /* 4 */ \
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"g" (mtxp) /* 5 */ \
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: "cc", "memory", "ecx", "edx" /* used */ ); \
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})
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/* Get a spin lock, handle recursion inline (as the less common case) */
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#define _getlock_spin_block(mtxp, tid, type) ({ \
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int _res = MTX_UNOWNED; \
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\
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__asm __volatile ( \
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" pushfl;" \
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" cli;" \
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" " MPLOCKED "" \
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" cmpxchgl %3,%1;" /* Try */ \
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" jz 2f;" /* got it */ \
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" pushl %4;" \
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" pushl %5;" \
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" call mtx_enter_hard;" /* mtx_enter_hard(mtxp, type, oflags) */ \
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" addl $12,%%esp;" \
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" jmp 1f;" \
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"2: popl %2;" /* save flags */ \
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"1:" \
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"# getlock_spin_block" \
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: "+a" (_res), /* 0 */ \
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"+m" (mtxp->mtx_lock), /* 1 */ \
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"=m" (mtxp->mtx_saveintr) /* 2 */ \
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: "r" (tid), /* 3 (input) */ \
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"gi" (type), /* 4 */ \
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"g" (mtxp) /* 5 */ \
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: "cc", "memory", "ecx", "edx" /* used */ ); \
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})
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/*
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* Get a lock without any recursion handling. Calls the hard enter function if
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* we can't get it inline.
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*/
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#define _getlock_norecurse(mtxp, tid, type) ({ \
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int _res = MTX_UNOWNED; \
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\
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__asm __volatile ( \
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" " MPLOCKED "" \
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" cmpxchgl %2,%1;" /* Try */ \
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" jz 1f;" /* got it */ \
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" pushl %3;" \
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" pushl %4;" \
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" call mtx_enter_hard;" /* mtx_enter_hard(mtxp, type) */ \
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" addl $8,%%esp;" \
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"1:" \
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"# getlock_norecurse" \
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: "+a" (_res), /* 0 */ \
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"+m" (mtxp->mtx_lock) /* 1 */ \
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: "r" (tid), /* 2 (input) */ \
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"gi" (type), /* 3 */ \
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"g" (mtxp) /* 4 */ \
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: "cc", "memory", "ecx", "edx" /* used */ ); \
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})
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/*
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* Release a sleep lock assuming we haven't recursed on it, recursion is handled
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* in the hard function.
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*/
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#define _exitlock_norecurse(mtxp, tid, type) ({ \
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int _tid = (int)(tid); \
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\
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__asm __volatile ( \
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" " MPLOCKED "" \
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" cmpxchgl %4,%0;" /* try easy rel */ \
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" jz 1f;" /* released! */ \
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" pushl %2;" \
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" pushl %3;" \
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" call mtx_exit_hard;" \
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" addl $8,%%esp;" \
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"1:" \
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"# exitlock_norecurse" \
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: "+m" (mtxp->mtx_lock), /* 0 */ \
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"+a" (_tid) /* 1 */ \
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: "gi" (type), /* 2 (input) */ \
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"g" (mtxp), /* 3 */ \
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"r" (MTX_UNOWNED) /* 4 */ \
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: "cc", "memory", "ecx", "edx" /* used */ ); \
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})
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/*
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* Release a sleep lock when its likely we recursed (the code to
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* deal with simple recursion is inline).
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*/
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#define _exitlock(mtxp, tid, type) ({ \
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int _tid = (int)(tid); \
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\
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__asm __volatile ( \
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" " MPLOCKED "" \
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" cmpxchgl %5,%0;" /* try easy rel */ \
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" jz 1f;" /* released! */ \
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" testl $" _V(MTX_RECURSE) ",%%eax;" /* recursed? */ \
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" jnz 3f;" /* handle recursion */ \
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/* Lock not recursed and contested: do the hard way */ \
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" pushl %3;" \
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" pushl %4;" \
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" call mtx_exit_hard;" /* mtx_exit_hard(mtxp,type) */ \
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" addl $8,%%esp;" \
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" jmp 1f;" \
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/* lock recursed, lower recursion level */ \
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"3: decl %1;" /* one less level */ \
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" jnz 1f;" /* still recursed, done */ \
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" lock; andl $~" _V(MTX_RECURSE) ",%0;" /* turn off recurse flag */ \
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"1:" \
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"# exitlock" \
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: "+m" (mtxp->mtx_lock), /* 0 */ \
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"+m" (mtxp->mtx_recurse), /* 1 */ \
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"+a" (_tid) /* 2 */ \
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: "gi" (type), /* 3 (input) */ \
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"g" (mtxp), /* 4 */ \
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"r" (MTX_UNOWNED) /* 5 */ \
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: "cc", "memory", "ecx", "edx" /* used */ ); \
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})
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/*
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* Release a spin lock (with possible recursion).
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*
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* We use xchgl to clear lock (instead of simple store) to flush posting
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* buffers and make the change visible to other CPU's.
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*/
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#define _exitlock_spin(mtxp) ({ \
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int _res; \
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\
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__asm __volatile ( \
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" movl %1,%2;" \
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" decl %2;" \
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" js 1f;" \
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" movl %2,%1;" \
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" jmp 2f;" \
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"1: movl $ " _V(MTX_UNOWNED) ",%2;" \
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" pushl %3;" \
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" xchgl %2,%0;" \
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" popfl;" \
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"2:" \
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"# exitlock_spin" \
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: "+m" (mtxp->mtx_lock), /* 0 */ \
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"+m" (mtxp->mtx_recurse), /* 1 */ \
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"=r" (_res) /* 2 */ \
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: "g" (mtxp->mtx_saveintr) /* 3 */ \
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: "cc", "memory", "ecx" /* used */ ); \
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})
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#endif /* I386_CPU */
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#undef _V
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#endif /* _KERNEL */
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#else /* !LOCORE */
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/*
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* Simple assembly macros to get and release mutexes.
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*
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* Note: All of these macros accept a "flags" argument and are analoguous
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* to the mtx_lock_flags and mtx_unlock_flags general macros. If one
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* desires to not pass a flag, the value 0 may be passed as second
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* argument.
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*
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* XXX: We only have MTX_LOCK_SPIN and MTX_UNLOCK_SPIN for now, since that's
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* all we use right now. We should add MTX_LOCK and MTX_UNLOCK (for sleep
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* locks) in the near future, however.
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*/
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#define MTX_LOCK_SPIN(lck, flags) \
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pushl %eax ; \
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pushl %ecx ; \
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pushl %ebx ; \
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movl $(MTX_UNOWNED) , %eax ; \
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movl PCPU(CURPROC), %ebx ; \
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pushfl ; \
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popl %ecx ; \
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cli ; \
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MPLOCKED cmpxchgl %ebx, lck+MTX_LOCK ; \
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jz 2f ; \
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cmpl lck+MTX_LOCK, %ebx ; \
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je 3f ; \
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pushl $0 ; \
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pushl $0 ; \
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pushl %ecx ; \
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pushl $flags ; \
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pushl $lck ; \
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call _mtx_lock_spin ; \
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addl $0x14, %esp ; \
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jmp 1f ; \
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3: movl lck+MTX_RECURSECNT, %ebx ; \
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incl %ebx ; \
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movl %ebx, lck+MTX_RECURSECNT ; \
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jmp 1f ; \
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2: movl %ecx, lck+MTX_SAVEINTR ; \
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1: popl %ebx ; \
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popl %ecx ; \
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popl %eax
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#define MTX_UNLOCK_SPIN(lck) \
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pushl %edx ; \
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pushl %eax ; \
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movl lck+MTX_SAVEINTR, %edx ; \
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movl lck+MTX_RECURSECNT, %eax ; \
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testl %eax, %eax ; \
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jne 2f ; \
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movl $(MTX_UNOWNED), %eax ; \
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xchgl %eax, lck+MTX_LOCK ; \
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pushl %edx ; \
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popfl ; \
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jmp 1f ; \
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2: decl %eax ; \
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movl %eax, lck+MTX_RECURSECNT ; \
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1: popl %eax ; \
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popl %edx
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/*
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* XXX: These two are broken right now and need to be made to work for
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* XXX: sleep locks, as the above two work for spin locks. We're not in
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* XXX: too much of a rush to do these as we do not use them right now.
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*/
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#define MTX_ENTER(lck, type) \
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pushl $0 ; /* dummy __LINE__ */ \
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pushl $0 ; /* dummy __FILE__ */ \
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pushl $type ; \
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pushl $lck ; \
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call _mtx_lock_XXX ; \
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addl $16,%esp
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#define MTX_EXIT(lck, type) \
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pushl $0 ; /* dummy __LINE__ */ \
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pushl $0 ; /* dummy __FILE__ */ \
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pushl $type ; \
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pushl $lck ; \
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call _mtx_unlock_XXX ; \
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addl $16,%esp
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#endif /* !LOCORE */
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#endif /* __MACHINE_MUTEX_H */
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