sys/bus/isa/pnpeat.c

   1 /*
   2  * Copyright 1998 Massachusetts Institute of Technology
   3  *
   4  * Permission to use, copy, modify, and distribute this software and
   5  * its documentation for any purpose and without fee is hereby
   6  * granted, provided that both the above copyright notice and this
   7  * permission notice appear in all copies, that both the above
   8  * copyright notice and this permission notice appear in all
   9  * supporting documentation, and that the name of M.I.T. not be used
  10  * in advertising or publicity pertaining to distribution of the
  11  * software without specific, written prior permission.  M.I.T. makes
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied
  14  * warranty.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sys/i386/i386/nexus.c,v 1.26.2.10 2003/02/22 13:16:45 imp Exp $
  30  */
  31
  32 /*
  33  * This code implements a `root nexus' for Intel Architecture
  34  * machines.  The function of the root nexus is to serve as an
  35  * attachment point for both processors and buses, and to manage
  36  * resources which are common to all of them.  In particular,
  37  * this code implements the core resource managers for interrupt
  38  * requests, DMA requests (which rightfully should be a part of the
  39  * ISA code but it's easier to do it here for now), I/O port addresses,
  40  * and I/O memory address space.
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/bus.h>
  46 #include <sys/kernel.h>
  47 #include <sys/malloc.h>
  48 #include <sys/module.h>
  49 #include <sys/rman.h>
  50
  51 #include <bus/isa/isavar.h>
  52 #include <bus/isa/isa.h>
  53
  54 /*
  55  * Placeholder which claims PnP 'devices' which describe system
  56  * resources.
  57  */
  58 static struct isa_pnp_id sysresource_ids[] = {
  59         { 0x010cd041 /* PNP0c01 */, "System Memory" },
  60         { 0x020cd041 /* PNP0c02 */, "System Resource" },
  61         { 0 }
  62 };
  63
  64 static int
  65 sysresource_probe(device_t dev)
  66 {
  67         int     result;
  68
  69         if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) >= 0) {
  70                 device_quiet(dev);
  71         }
  72         return (result);
  73 }
  74
  75 static int
  76 sysresource_attach(device_t dev)
  77 {
  78         return (0);
  79 }
  80
  81 static device_method_t sysresource_methods[] = {
  82         /* Device interface */
  83         DEVMETHOD(device_probe,         sysresource_probe),
  84         DEVMETHOD(device_attach,        sysresource_attach),
  85         DEVMETHOD(device_detach,        bus_generic_detach),
  86         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  87         DEVMETHOD(device_suspend,       bus_generic_suspend),
  88         DEVMETHOD(device_resume,        bus_generic_resume),
  89         DEVMETHOD_END
  90 };
  91
  92 static driver_t sysresource_driver = {
  93         "sysresource",
  94         sysresource_methods,
  95         1,              /* no softc */
  96 };
  97
  98 static devclass_t sysresource_devclass;
  99
 100 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, NULL, NULL);