diff options
Diffstat (limited to 'sys/arch/i386/i386/softintr.c')
| -rw-r--r-- | sys/arch/i386/i386/softintr.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sys/arch/i386/i386/softintr.c b/sys/arch/i386/i386/softintr.c new file mode 100644 index 00000000000..c071c3ef36d --- /dev/null +++ b/sys/arch/i386/i386/softintr.c @@ -0,0 +1,168 @@ +/* $OpenBSD: softintr.c,v 1.1 2008/05/07 20:42:02 kettenis Exp $ */ +/* $NetBSD: softintr.c,v 1.1 2003/02/26 21:26:12 fvdl Exp $ */ + +/*- + * Copyright (c) 2000, 2001 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Jason R. Thorpe. + * + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. + */ + +/* + * Generic soft interrupt implementation for NetBSD/x86. + */ + +#include <sys/param.h> +#include <sys/malloc.h> + +#include <machine/intr.h> + +#include <uvm/uvm_extern.h> + +struct i386_soft_intr i386_soft_intrs[I386_NSOFTINTR]; + +const int i386_soft_intr_to_ssir[I386_NSOFTINTR] = { + SIR_CLOCK, + SIR_NET, + SIR_TTY, +}; + +/* + * softintr_init: + * + * Initialize the software interrupt system. + */ +void +softintr_init(void) +{ + struct i386_soft_intr *si; + int i; + + for (i = 0; i < I386_NSOFTINTR; i++) { + si = &i386_soft_intrs[i]; + TAILQ_INIT(&si->softintr_q); + simple_lock_init(&si->softintr_slock); + si->softintr_ssir = i386_soft_intr_to_ssir[i]; + } +} + +/* + * softintr_dispatch: + * + * Process pending software interrupts. + */ +void +softintr_dispatch(int which) +{ + struct i386_soft_intr *si = &i386_soft_intrs[which]; + struct i386_soft_intrhand *sih; + int s; + + for (;;) { + i386_softintr_lock(si, s); + sih = TAILQ_FIRST(&si->softintr_q); + if (sih == NULL) { + i386_softintr_unlock(si, s); + break; + } + TAILQ_REMOVE(&si->softintr_q, sih, sih_q); + sih->sih_pending = 0; + i386_softintr_unlock(si, s); + + uvmexp.softs++; + (*sih->sih_fn)(sih->sih_arg); + } +} + +/* + * softintr_establish: [interface] + * + * Register a software interrupt handler. + */ +void * +softintr_establish(int ipl, void (*func)(void *), void *arg) +{ + struct i386_soft_intr *si; + struct i386_soft_intrhand *sih; + int which; + + switch (ipl) { + case IPL_SOFTCLOCK: + which = I386_SOFTINTR_SOFTCLOCK; + break; + + case IPL_SOFTNET: + which = I386_SOFTINTR_SOFTNET; + break; + + case IPL_TTY: + case IPL_SOFTTTY: + which = I386_SOFTINTR_SOFTTTY; + break; + + default: + panic("softintr_establish"); + } + + si = &i386_soft_intrs[which]; + + sih = malloc(sizeof(*sih), M_DEVBUF, M_NOWAIT); + if (__predict_true(sih != NULL)) { + sih->sih_intrhead = si; + sih->sih_fn = func; + sih->sih_arg = arg; + sih->sih_pending = 0; + } + return (sih); +} + +/* + * softintr_disestablish: [interface] + * + * Unregister a software interrupt handler. + */ +void +softintr_disestablish(void *arg) +{ + struct i386_soft_intrhand *sih = arg; + struct i386_soft_intr *si = sih->sih_intrhead; + int s; + + i386_softintr_lock(si, s); + if (sih->sih_pending) { + TAILQ_REMOVE(&si->softintr_q, sih, sih_q); + sih->sih_pending = 0; + } + i386_softintr_unlock(si, s); + + free(sih, M_DEVBUF); +} |