The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/isa/isahint.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1999 Doug Rabson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/isa/isahint.c 326272 2017-11-27 15:23:17Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/bus.h>
   36 #include <sys/module.h>
   37 #include <isa/isavar.h>
   38 #include <isa/isa_common.h>
   39 #include <machine/resource.h>
   40 
   41 void
   42 isa_hinted_child(device_t parent, const char *name, int unit)
   43 {
   44         device_t        child;
   45         int             sensitive, start, count;
   46         int             order;
   47 
   48         /* device-specific flag overrides any wildcard */
   49         sensitive = 0;
   50         if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
   51                 resource_int_value(name, -1, "sensitive", &sensitive);
   52 
   53         if (sensitive)
   54                 order = ISA_ORDER_SENSITIVE;
   55         else
   56                 order = ISA_ORDER_SPECULATIVE;
   57 
   58         child = BUS_ADD_CHILD(parent, order, name, unit);
   59         if (child == 0)
   60                 return;
   61 
   62         start = 0;
   63         count = 0;
   64         resource_int_value(name, unit, "port", &start);
   65         resource_int_value(name, unit, "portsize", &count);
   66         if (start > 0 || count > 0)
   67                 bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);
   68 
   69         start = 0;
   70         count = 0;
   71         resource_int_value(name, unit, "maddr", &start);
   72         resource_int_value(name, unit, "msize", &count);
   73         if (start > 0 || count > 0)
   74                 bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);
   75 
   76         if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
   77                 bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);
   78 
   79         if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
   80                 bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);
   81 
   82         if (resource_disabled(name, unit))
   83                 device_disable(child);
   84 
   85         isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
   86 }
   87 
   88 static int
   89 isa_match_resource_hint(device_t dev, int type, long value)
   90 {
   91         struct isa_device* idev = DEVTOISA(dev);
   92         struct resource_list *rl = &idev->id_resources;
   93         struct resource_list_entry *rle;
   94 
   95         STAILQ_FOREACH(rle, rl, link) {
   96                 if (rle->type != type)
   97                         continue;
   98                 if (rle->start <= value && rle->end >= value)
   99                         return (1);
  100         }
  101         return (0);
  102 }
  103 
  104 void
  105 isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
  106 {
  107         const char *s;
  108         long value;
  109         int line, matches, unit;
  110 
  111         line = 0;
  112         for (;;) {
  113                 if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
  114                         break;
  115 
  116                 /* Must have an "at" for isa. */
  117                 resource_string_value(name, unit, "at", &s);
  118                 if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
  119                     strcmp(s, device_get_name(bus)) == 0))
  120                         continue;
  121 
  122                 /*
  123                  * Check for matching resources.  We must have at
  124                  * least one match.  Since I/O and memory resources
  125                  * cannot be shared, if we get a match on either of
  126                  * those, ignore any mismatches in IRQs or DRQs.
  127                  *
  128                  * XXX: We may want to revisit this to be more lenient
  129                  * and wire as long as it gets one match.
  130                  */
  131                 matches = 0;
  132                 if (resource_long_value(name, unit, "port", &value) == 0) {
  133                         /*
  134                          * Floppy drive controllers are notorious for
  135                          * having a wide variety of resources not all
  136                          * of which include the first port that is
  137                          * specified by the hint (typically 0x3f0)
  138                          * (see the comment above
  139                          * fdc_isa_alloc_resources() in fdc_isa.c).
  140                          * However, they do all seem to include port +
  141                          * 2 (e.g. 0x3f2) so for a floppy device, look
  142                          * for 'value + 2' in the port resources
  143                          * instead of the hint value.
  144                          */
  145                         if (strcmp(name, "fdc") == 0)
  146                                 value += 2;
  147                         if (isa_match_resource_hint(child, SYS_RES_IOPORT,
  148                             value))
  149                                 matches++;
  150                         else
  151                                 continue;
  152                 }
  153                 if (resource_long_value(name, unit, "maddr", &value) == 0) {
  154                         if (isa_match_resource_hint(child, SYS_RES_MEMORY,
  155                             value))
  156                                 matches++;
  157                         else
  158                                 continue;
  159                 }
  160                 if (matches > 0)
  161                         goto matched;
  162                 if (resource_long_value(name, unit, "irq", &value) == 0) {
  163                         if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
  164                                 matches++;
  165                         else
  166                                 continue;
  167                 }
  168                 if (resource_long_value(name, unit, "drq", &value) == 0) {
  169                         if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
  170                                 matches++;
  171                         else
  172                                 continue;
  173                 }
  174 
  175         matched:
  176                 if (matches > 0) {
  177                         /* We have a winner! */
  178                         *unitp = unit;
  179                         break;
  180                 }
  181         }
  182 }

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