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Annotation of src/sys/kern/kern_softint.c, Revision 1.4.2.2

1.4.2.2 ! matt        1: /*     $NetBSD: kern_softint.c,v 1.4 2007/11/06 00:42:42 ad 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 1.4 2007/11/06 00:42:42 ad 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: }