isa.c

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    1 /*-
    2  * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND ISC)
    3  *
    4  * Copyright (c) 1998 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("$FreeBSD$");
   31 
   32 /*-
   33  * Modifications for Intel architecture by Garrett A. Wollman.
   34  * Copyright 1998 Massachusetts Institute of Technology
   35  *
   36  * Permission to use, copy, modify, and distribute this software and
   37  * its documentation for any purpose and without fee is hereby
   38  * granted, provided that both the above copyright notice and this
   39  * permission notice appear in all copies, that both the above
   40  * copyright notice and this permission notice appear in all
   41  * supporting documentation, and that the name of M.I.T. not be used
   42  * in advertising or publicity pertaining to distribution of the
   43  * software without specific, written prior permission.  M.I.T. makes
   44  * no representations about the suitability of this software for any
   45  * purpose.  It is provided "as is" without express or implied
   46  * warranty.
   47  * 
   48  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   49  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   50  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   51  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   52  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   53  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   54  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   55  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   56  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   57  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   58  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  */
   61 
   62 #include <sys/param.h>
   63 #include <sys/bus.h>
   64 #include <sys/kernel.h>
   65 #include <sys/malloc.h>
   66 #include <sys/module.h>
   67 #include <machine/bus.h>
   68 #include <sys/rman.h>
   69 
   70 #include <machine/resource.h>
   71 
   72 #include <isa/isavar.h>
   73 #include <isa/isa_common.h>
   74 
   75 void
   76 isa_init(device_t dev)
   77 {
   78 }
   79 
   80 /*
   81  * This implementation simply passes the request up to the parent
   82  * bus, which in our case is the special i386 nexus, substituting any
   83  * configured values if the caller defaulted.  We can get away with
   84  * this because there is no special mapping for ISA resources on an Intel
   85  * platform.  When porting this code to another architecture, it may be
   86  * necessary to interpose a mapping layer here.
   87  */
   88 struct resource *
   89 isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
   90                    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
   91 {
   92         /*
   93          * Consider adding a resource definition.
   94          */
   95         int passthrough = (device_get_parent(child) != bus);
   96         int isdefault = RMAN_IS_DEFAULT_RANGE(start, end);
   97         struct isa_device* idev = DEVTOISA(child);
   98         struct resource_list *rl = &idev->id_resources;
   99         struct resource_list_entry *rle;
  100         
  101         if (!passthrough && !isdefault) {
  102                 rle = resource_list_find(rl, type, *rid);
  103                 if (!rle) {
  104                         if (*rid < 0)
  105                                 return 0;
  106                         switch (type) {
  107                         case SYS_RES_IRQ:
  108                                 if (*rid >= ISA_NIRQ)
  109                                         return 0;
  110                                 break;
  111                         case SYS_RES_DRQ:
  112                                 if (*rid >= ISA_NDRQ)
  113                                         return 0;
  114                                 break;
  115                         case SYS_RES_MEMORY:
  116                                 if (*rid >= ISA_NMEM)
  117                                         return 0;
  118                                 break;
  119                         case SYS_RES_IOPORT:
  120                                 if (*rid >= ISA_NPORT)
  121                                         return 0;
  122                                 break;
  123                         default:
  124                                 return 0;
  125                         }
  126                         resource_list_add(rl, type, *rid, start, end, count);
  127                 }
  128         }
  129 
  130         return resource_list_alloc(rl, bus, child, type, rid,
  131                                    start, end, count, flags);
  132 }
  133 
  134 int
  135 isa_release_resource(device_t bus, device_t child, int type, int rid,
  136                      struct resource *r)
  137 {
  138         struct isa_device* idev = DEVTOISA(child);
  139         struct resource_list *rl = &idev->id_resources;
  140 
  141         return resource_list_release(rl, bus, child, type, rid, r);
  142 }
  143 
  144 /*
  145  * On this platform, isa can also attach to the legacy bus.
  146  */
  147 DRIVER_MODULE(isa, legacy, isa_driver, isa_devclass, 0, 0);
  148 
  149 /*
  150  * Attach the ISA bus to the xenpv bus in order to get syscons.
  151  */
  152 DRIVER_MODULE(isa, xenpv, isa_driver, isa_devclass, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/x86/isa/isa.c

FreeBSD/Linux Kernel Cross Reference
sys/x86/isa/isa.c