435 lines
11 KiB
C
435 lines
11 KiB
C
/* $NetBSD: subr_autoconf.c,v 1.18 1996/02/27 21:45:46 cgd Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratories.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL)
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*
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* @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <machine/limits.h>
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/*
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* Autoconfiguration subroutines.
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*/
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/*
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* ioconf.c exports exactly two names: cfdata and cfroots. All system
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* devices and drivers are found via these tables.
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*/
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extern struct cfdata cfdata[];
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extern short cfroots[];
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#define ROOT ((struct device *)NULL)
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struct device *config_make_softc __P((struct device *, struct cfdata *));
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struct matchinfo {
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cfmatch_t fn;
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struct device *parent;
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void *match, *aux;
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int indirect, pri;
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};
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static char *number __P((char *, int));
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static void mapply __P((struct matchinfo *, struct cfdata *));
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/*
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* Apply the matching function and choose the best. This is used
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* a few times and we want to keep the code small.
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*/
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static void
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mapply(m, cf)
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register struct matchinfo *m;
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register struct cfdata *cf;
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{
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register int pri;
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void *match;
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if (m->indirect)
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match = config_make_softc(m->parent, cf);
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else
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match = cf;
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if (m->fn != NULL)
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pri = (*m->fn)(m->parent, match, m->aux);
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else {
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if (cf->cf_driver->cd_match == NULL) {
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panic("mapply: no match function for '%s' device\n",
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cf->cf_driver->cd_name);
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}
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pri = (*cf->cf_driver->cd_match)(m->parent, match, m->aux);
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}
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if (pri > m->pri) {
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if (m->indirect && m->match)
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free(m->match, M_DEVBUF);
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m->match = match;
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m->pri = pri;
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} else {
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if (m->indirect)
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free(match, M_DEVBUF);
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}
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}
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/*
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* Iterate over all potential children of some device, calling the given
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* function (default being the child's match function) for each one.
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* Nonzero returns are matches; the highest value returned is considered
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* the best match. Return the `found child' if we got a match, or NULL
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* otherwise. The `aux' pointer is simply passed on through.
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*
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* Note that this function is designed so that it can be used to apply
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* an arbitrary function to all potential children (its return value
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* can be ignored).
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*/
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void *
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config_search(fn, parent, aux)
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cfmatch_t fn;
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register struct device *parent;
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void *aux;
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{
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register struct cfdata *cf;
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register short *p;
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struct matchinfo m;
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m.fn = fn;
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m.parent = parent;
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m.match = NULL;
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m.aux = aux;
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m.indirect = parent && parent->dv_cfdata->cf_driver->cd_indirect;
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m.pri = 0;
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for (cf = cfdata; cf->cf_driver; cf++) {
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/*
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* Skip cf if no longer eligible, otherwise scan through
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* parents for one matching `parent', and try match function.
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*/
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if (cf->cf_fstate == FSTATE_FOUND)
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continue;
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for (p = cf->cf_parents; *p >= 0; p++)
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if (parent->dv_cfdata == &cfdata[*p])
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mapply(&m, cf);
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}
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return (m.match);
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}
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/*
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* Iterate over all potential children of some device, calling the given
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* function for each one.
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*
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* Note that this function is designed so that it can be used to apply
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* an arbitrary function to all potential children (its return value
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* can be ignored).
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*/
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void
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config_scan(fn, parent)
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cfscan_t fn;
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register struct device *parent;
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{
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register struct cfdata *cf;
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register short *p;
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void *match;
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int indirect;
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indirect = parent && parent->dv_cfdata->cf_driver->cd_indirect;
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for (cf = cfdata; cf->cf_driver; cf++) {
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/*
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* Skip cf if no longer eligible, otherwise scan through
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* parents for one matching `parent', and try match function.
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*/
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if (cf->cf_fstate == FSTATE_FOUND)
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continue;
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for (p = cf->cf_parents; *p >= 0; p++)
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if (parent->dv_cfdata == &cfdata[*p]) {
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if (indirect)
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match = config_make_softc(parent, cf);
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else
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match = cf;
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(*fn)(parent, match);
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}
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}
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}
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/*
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* Find the given root device.
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* This is much like config_search, but there is no parent.
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*/
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void *
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config_rootsearch(fn, rootname, aux)
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register cfmatch_t fn;
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register char *rootname;
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register void *aux;
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{
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register struct cfdata *cf;
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register short *p;
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struct matchinfo m;
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m.fn = fn;
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m.parent = ROOT;
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m.match = NULL;
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m.aux = aux;
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m.indirect = 0;
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m.pri = 0;
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/*
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* Look at root entries for matching name. We do not bother
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* with found-state here since only one root should ever be
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* searched (and it must be done first).
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*/
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for (p = cfroots; *p >= 0; p++) {
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cf = &cfdata[*p];
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if (strcmp(cf->cf_driver->cd_name, rootname) == 0)
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mapply(&m, cf);
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}
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return (m.match);
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}
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static char *msgs[3] = { "", " not configured\n", " unsupported\n" };
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/*
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* The given `aux' argument describes a device that has been found
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* on the given parent, but not necessarily configured. Locate the
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* configuration data for that device (using the submatch function
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* provided, or using candidates' cd_match configuration driver
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* functions) and attach it, and return true. If the device was
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* not configured, call the given `print' function and return 0.
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*/
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int
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config_found_sm(parent, aux, print, submatch)
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struct device *parent;
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void *aux;
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cfprint_t print;
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cfmatch_t submatch;
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{
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void *match;
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if ((match = config_search(submatch, parent, aux)) != NULL) {
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config_attach(parent, match, aux, print);
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return (1);
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}
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if (print)
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printf(msgs[(*print)(aux, parent->dv_xname)]);
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return (0);
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}
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/*
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* As above, but for root devices.
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*/
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int
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config_rootfound(rootname, aux)
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char *rootname;
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void *aux;
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{
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void *match;
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if ((match = config_rootsearch((cfmatch_t)NULL, rootname, aux))
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!= NULL) {
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config_attach(ROOT, match, aux, (cfprint_t)NULL);
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return (1);
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}
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printf("root device %s not configured\n", rootname);
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return (0);
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}
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/* just like sprintf(buf, "%d") except that it works from the end */
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static char *
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number(ep, n)
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register char *ep;
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register int n;
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{
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*--ep = 0;
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while (n >= 10) {
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*--ep = (n % 10) + '0';
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n /= 10;
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}
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*--ep = n + '0';
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return (ep);
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}
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/*
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* Attach a found device. Allocates memory for device variables.
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*/
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void
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config_attach(parent, match, aux, print)
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register struct device *parent;
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void *match;
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register void *aux;
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cfprint_t print;
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{
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register struct cfdata *cf;
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register struct device *dev;
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register struct cfdriver *cd;
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static struct device **nextp = &alldevs;
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if (parent && parent->dv_cfdata->cf_driver->cd_indirect) {
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dev = match;
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cf = dev->dv_cfdata;
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} else {
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cf = match;
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dev = config_make_softc(parent, cf);
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}
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cd = cf->cf_driver;
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cd->cd_devs[cf->cf_unit] = dev;
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if (cf->cf_fstate == FSTATE_STAR)
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cf->cf_unit++;
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else
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cf->cf_fstate = FSTATE_FOUND;
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*nextp = dev; /* link up */
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nextp = &dev->dv_next;
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if (parent == ROOT)
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printf("%s (root)", dev->dv_xname);
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else {
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printf("%s at %s", dev->dv_xname, parent->dv_xname);
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if (print)
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(void) (*print)(aux, (char *)0);
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}
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/*
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* Before attaching, clobber any unfound devices that are
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* otherwise identical.
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*/
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for (cf = cfdata; cf->cf_driver; cf++)
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if (cf->cf_driver == cd && cf->cf_unit == dev->dv_unit &&
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cf->cf_fstate == FSTATE_NOTFOUND)
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cf->cf_fstate = FSTATE_FOUND;
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(*cd->cd_attach)(parent, dev, aux);
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}
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struct device *
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config_make_softc(parent, cf)
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struct device *parent;
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struct cfdata *cf;
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{
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register struct device *dev;
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register struct cfdriver *cd;
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register size_t lname, lunit;
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register char *xunit;
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char num[10];
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cd = cf->cf_driver;
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if (cd->cd_devsize < sizeof(struct device))
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panic("config_make_softc");
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/* compute length of name and decimal expansion of unit number */
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lname = strlen(cd->cd_name);
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xunit = number(&num[sizeof num], cf->cf_unit);
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lunit = &num[sizeof num] - xunit;
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if (lname + lunit >= sizeof(dev->dv_xname))
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panic("config_attach: device name too long");
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/* get memory for all device vars */
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dev = (struct device *)malloc(cd->cd_devsize, M_DEVBUF, M_NOWAIT);
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if (!dev)
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panic("config_attach: memory allocation for device softc failed");
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bzero(dev, cd->cd_devsize);
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dev->dv_class = cd->cd_class;
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dev->dv_cfdata = cf;
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dev->dv_unit = cf->cf_unit;
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bcopy(cd->cd_name, dev->dv_xname, lname);
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bcopy(xunit, dev->dv_xname + lname, lunit);
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dev->dv_parent = parent;
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/* put this device in the devices array */
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if (dev->dv_unit >= cd->cd_ndevs) {
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/*
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* Need to expand the array.
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*/
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int old = cd->cd_ndevs, new;
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void **nsp;
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if (old == 0)
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new = MINALLOCSIZE / sizeof(void *);
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else
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new = old * 2;
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while (new <= dev->dv_unit)
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new *= 2;
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cd->cd_ndevs = new;
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nsp = malloc(new * sizeof(void *), M_DEVBUF, M_NOWAIT);
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if (nsp == 0)
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panic("config_attach: %sing dev array",
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old != 0 ? "expand" : "creat");
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bzero(nsp + old, (new - old) * sizeof(void *));
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if (old != 0) {
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bcopy(cd->cd_devs, nsp, old * sizeof(void *));
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free(cd->cd_devs, M_DEVBUF);
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}
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cd->cd_devs = nsp;
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}
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if (cd->cd_devs[dev->dv_unit])
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panic("config_attach: duplicate %s", dev->dv_xname);
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return (dev);
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}
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/*
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* Attach an event. These must come from initially-zero space (see
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* commented-out assignments below), but that occurs naturally for
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* device instance variables.
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*/
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void
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evcnt_attach(dev, name, ev)
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struct device *dev;
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const char *name;
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struct evcnt *ev;
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{
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static struct evcnt **nextp = &allevents;
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#ifdef DIAGNOSTIC
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if (strlen(name) >= sizeof(ev->ev_name))
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panic("evcnt_attach");
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#endif
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/* ev->ev_next = NULL; */
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ev->ev_dev = dev;
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/* ev->ev_count = 0; */
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strcpy(ev->ev_name, name);
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*nextp = ev;
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nextp = &ev->ev_next;
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}
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