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kern_softint.c revision 1.3.6.1 
      1 /*	$NetBSD: kern_softint.c,v 1.3.6.1 2007/11/19 00:48:42 mjf Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Stub for code to be merged from the vmlocking CVS branch.
     41  */
     42 
     43 #include <sys/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.3.6.1 2007/11/19 00:48:42 mjf Exp $");
     45 
     46 #include <sys/param.h>
     47 #include <sys/intr.h>
     48 
     49 u_int	softint_timing;
     50 
     51 /*
     52  * softint_init:
     53  *
     54  *	Initialize per-CPU data structures.  Called from mi_cpu_attach().
     55  */
     56 void
     57 softint_init(struct cpu_info *ci)
     58 {
     59 
     60 	/* nothing yet */
     61 }
     62 
     63 /*
     64  * softint_establish:
     65  *
     66  *	Register a software interrupt handler.
     67  */
     68 void *
     69 softint_establish(u_int flags, void (*func)(void *), void *arg)
     70 {
     71 	u_int level;
     72 
     73 	level = (flags & SOFTINT_LVLMASK);
     74 	KASSERT(level < SOFTINT_COUNT);
     75 
     76 	switch (level) {
     77 	case SOFTINT_CLOCK:
     78 		level = IPL_SOFTCLOCK;
     79 		break;
     80 	case SOFTINT_NET:
     81 	case SOFTINT_BIO:
     82 		level = IPL_SOFTNET;
     83 		break;
     84 	case SOFTINT_SERIAL:
     85 #ifdef IPL_SOFTSERIAL
     86 		level = IPL_SOFTSERIAL;
     87 #else
     88 		level = IPL_SOFTNET;
     89 #endif
     90 		break;
     91 	default:
     92 		panic("softint_establish");
     93 	}
     94 
     95 	return softintr_establish(level, func, arg);
     96 }
     97 
     98 /*
     99  * softint_disestablish:
    100  *
    101  *	Unregister a software interrupt handler.
    102  */
    103 void
    104 softint_disestablish(void *arg)
    105 {
    106 
    107 	softintr_disestablish(arg);
    108 }
    109 
    110 /*
    111  * softint_schedule:
    112  *
    113  *	Trigger a software interrupt.  Must be called from a hardware
    114  *	interrupt handler, or with preemption disabled (since we are
    115  *	using the value of curcpu()).
    116  */
    117 void
    118 softint_schedule(void *arg)
    119 {
    120 
    121 	softintr_schedule(arg);
    122 }
    123 
    124 /*
    125  * softint_block:
    126  *
    127  *	Update statistics when the soft interrupt blocks.
    128  */
    129 void
    130 softint_block(lwp_t *l)
    131 {
    132 
    133 	/* nothing yet */
    134 }
    135 
    136 /*
    137  * softint_picklwp:
    138  *
    139  *	Slow path: called from mi_switch() to pick the highest priority
    140  *	soft interrupt LWP that needs to run.
    141  */
    142 lwp_t *
    143 softint_picklwp(void)
    144 {
    145 
    146 	panic("softint_picklwp");
    147 }
    148 
    149 /*
    150  * softint_overlay:
    151  *
    152  *	Slow path: called from lwp_userret() to run a soft interrupt
    153  *	within the context of a user thread.  If the LWP blocks,
    154  *	priority will be elevated in sched_kpri().
    155  */
    156 void
    157 softint_overlay(void)
    158 {
    159 
    160 	panic("softint_overlay");
    161 }
    162 
    163 /*
    164  * softint_kpri:
    165  *
    166  *	Adjust priority for a blocking user LWP that is handling a
    167  *	soft interrupt.
    168  */
    169 pri_t
    170 softint_kpri(lwp_t *l)
    171 {
    172 
    173 	/* No point doing anything more fair / complicated. */
    174 	return PRI_SOFTSERIAL;
    175 }
    176