139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/* $NetBSD: intrctl_io.c,v 1.5 2019/09/23 09:17:19 mrg Exp $ */
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/*
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* Copyright (c) 2015 Internet Initiative Japan Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: intrctl_io.c,v 1.5 2019/09/23 09:17:19 mrg Exp $");
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#include <sys/sysctl.h>
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#include <sys/intrio.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "intrctl_io.h"
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/*
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* To support increasing the number of interrupts (devices are dynamically
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* attached), retry sysctl(3) "retry" times.
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*/
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void *
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intrctl_io_alloc(int retry)
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{
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size_t buf_size;
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int i, error;
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void *buf = NULL;
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error = sysctlbyname("kern.intr.list", NULL, &buf_size, NULL, 0);
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if (error < 0) {
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goto error;
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}
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buf = malloc(buf_size);
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if (buf == NULL) {
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goto error;
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}
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for (i = 0; i < retry; i++) {
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error = sysctlbyname("kern.intr.list", buf, &buf_size, NULL, 0);
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if (error >= 0)
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return buf;
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else if (errno == ENOMEM) {
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void *temp;
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temp = realloc(buf, buf_size);
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if (temp == NULL) {
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goto error;
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}
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buf = temp;
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} else {
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goto error;
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}
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}
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error:
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free(buf);
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return NULL;
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}
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void
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intrctl_io_free(void *handle)
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{
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free(handle);
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}
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int
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intrctl_io_ncpus(void *handle)
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{
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struct intrio_list *list = handle;
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return list->il_ncpus;
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}
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int
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intrctl_io_nintrs(void *handle)
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{
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struct intrio_list *list = handle;
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return list->il_nintrs;
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}
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struct intrio_list_line *
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intrctl_io_firstline(void *handle)
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{
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struct intrio_list *list = handle;
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struct intrio_list_line *next;
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char *buf_end;
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buf_end = (char *)list + list->il_bufsize;
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next = (struct intrio_list_line *)((char *)list + list->il_lineoffset);
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if ((char *)next >= buf_end)
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return NULL;
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return next;
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}
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struct intrio_list_line *
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intrctl_io_nextline(void *handle, struct intrio_list_line *cur)
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{
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struct intrio_list *list;
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struct intrio_list_line *next;
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size_t line_size;
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char *buf_end;
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list = handle;
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buf_end = (char *)list + list->il_bufsize;
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line_size = list->il_linesize;
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next = (struct intrio_list_line *)((char *)cur + line_size);
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if ((char *)next >= buf_end)
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return NULL;
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return next;
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}
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