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Implement fast-path mutex_enter and mutex_exit stubs.

This commit is contained in:
uwe 2007-03-14 01:14:25 +00:00
parent 21a60be327
commit 8e5c3b9886
2 changed files with 48 additions and 3 deletions
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4
sys/arch/sh3/include/mutex.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: mutex.h,v 1.5 2007/03/12 00:57:13 uwe Exp $ */
/* $NetBSD: mutex.h,v 1.6 2007/03/14 01:14:25 uwe Exp $ */
/*-
* Copyright (c) 2002, 2007 The NetBSD Foundation, Inc.
@ -68,8 +68,8 @@ struct kmutex {
#define mtx_ipl u.s.mtxs_ipl
#define mtx_lock u.s.mtxs_lock
#undef __HAVE_MUTEX_STUBS
#define __HAVE_SIMPLE_MUTEXES 1
#define __HAVE_MUTEX_STUBS 1
/*
* MUTEX_RECEIVE: no memory barrier required; we're synchronizing against

47
sys/arch/sh3/sh3/lock_stubs.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: lock_stubs.S,v 1.2 2007/02/23 03:24:47 uwe Exp $ */
/* $NetBSD: lock_stubs.S,v 1.3 2007/03/14 01:14:25 uwe Exp $ */
/*
* Copyright (c) 2007 Valeriy E. Ushakov
@ -57,3 +57,48 @@ NENTRY(_lock_cas)
ldc r7, sr ! restore SR (cannot be in delay slot)
rts
nop
/*
* LINTSTUB: Func: void mutex_enter(kmutex_t *mtx);
*/
NENTRY(mutex_enter)
sts.l pr, @-sp
mov.l .L_curlwp, r6
mov #0, r5
bsr _lock_cas ! _lock_cas(&mtx->mtx_owner, 0, curlwp)
mov.l @r6, r6
tst r0, r0
bf.s 1f ! return if success
lds.l @sp+, pr
mov.l .L_mutex_vector_enter, r0
jmp @r0 ! otherwise - hard case
nop
/* NOTREACHED */
1: rts
nop
/*
* LINTSTUB: Func: void mutex_exit(kmutex_t *mtx);
*/
NENTRY(mutex_exit)
sts.l pr, @-sp
mov.l .L_curlwp, r5
mov #0, r6
bsr _lock_cas ! _lock_cas(&mtx->mtx_owner, curlwp, 0)
mov.l @r5, r5
tst r0, r0
bf.s 1f ! return if success
lds.l @sp+, pr
mov.l .L_mutex_vector_exit, r0
jmp @r0 ! otherwise - hard case
nop
/* NOTREACHED */
1: rts
nop
.align 2
.L_curlwp: .long _C_LABEL(curlwp)
.L_mutex_vector_enter: .long _C_LABEL(mutex_vector_enter)
.L_mutex_vector_exit: .long _C_LABEL(mutex_vector_exit)