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/i386/i386/autoconf.c

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)autoconf.c    7.1 (Berkeley) 5/9/91
   37  * $FreeBSD: releng/5.0/sys/i386/i386/autoconf.c 103770 2002-09-22 00:59:02Z jake $
   38  */
   39 
   40 /*
   41  * Setup the system to run on the current machine.
   42  *
   43  * Configure() is called at boot time and initializes the vba
   44  * device tables and the memory controller monitoring.  Available
   45  * devices are determined (from possibilities mentioned in ioconf.c),
   46  * and the drivers are initialized.
   47  */
   48 #include "opt_bootp.h"
   49 #include "opt_isa.h"
   50 #include "opt_nfs.h"
   51 #include "opt_nfsroot.h"
   52 #include "opt_bus.h"
   53 
   54 #include <sys/param.h>
   55 #include <sys/systm.h>
   56 #include <sys/bus.h>
   57 #include <sys/conf.h>
   58 #include <sys/reboot.h>
   59 #include <sys/kernel.h>
   60 #include <sys/malloc.h>
   61 #include <sys/mount.h>
   62 #include <sys/cons.h>
   63 
   64 #include <sys/socket.h>
   65 #include <net/if.h>
   66 #include <net/if_dl.h>
   67 #include <net/if_types.h>
   68 #include <net/if_var.h>
   69 #include <net/ethernet.h>
   70 #include <netinet/in.h>
   71 #include <nfs/rpcv2.h>
   72 #include <nfs/nfsproto.h>
   73 #include <nfsclient/nfs.h>
   74 #include <nfsclient/nfsdiskless.h>
   75 
   76 #include <machine/bootinfo.h>
   77 #include <machine/md_var.h>
   78 #ifdef APIC_IO
   79 #include <machine/smp.h>
   80 #else
   81 #include <i386/isa/icu.h>
   82 #endif /* APIC_IO */
   83 
   84 #ifdef DEV_ISA
   85 #include <isa/isavar.h>
   86 
   87 device_t isa_bus_device = 0;
   88 #endif
   89 
   90 static void     configure_first(void *);
   91 static void     configure(void *);
   92 static void     configure_final(void *);
   93 
   94 SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
   95 /* SI_ORDER_SECOND is hookable */
   96 SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
   97 /* SI_ORDER_MIDDLE is hookable */
   98 SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
   99 
  100 device_t nexus_dev;
  101 
  102 /*
  103  * Determine i/o configuration for a machine.
  104  */
  105 static void
  106 configure_first(dummy)
  107         void *dummy;
  108 {
  109 }
  110 
  111 static void
  112 configure(dummy)
  113         void *dummy;
  114 {
  115 
  116         /*
  117          * Activate the ICU's.  Note that we are explicitly at splhigh()
  118          * at present as we have no way to disable stray PCI level triggered
  119          * interrupts until the devices have had a driver attached.  This
  120          * is particularly a problem when the interrupts are shared.  For
  121          * example, if IRQ 10 is shared between a disk and network device
  122          * and the disk device generates an interrupt, if we "activate"
  123          * IRQ 10 when the network driver is set up, then we will get
  124          * recursive interrupt 10's as nothing will know how to turn off
  125          * the disk device's interrupt.
  126          *
  127          * Having the ICU's active means we can probe interrupt routing to
  128          * see if a device causes the corresponding pending bit to be set.
  129          *
  130          * This is all rather inconvenient.
  131          */
  132 #ifdef APIC_IO
  133         bsp_apic_configure();
  134         enable_intr();
  135 #else
  136         enable_intr();
  137         INTREN(IRQ_SLAVE);
  138 #endif /* APIC_IO */
  139 
  140         /* nexus0 is the top of the i386 device tree */
  141         device_add_child(root_bus, "nexus", 0);
  142 
  143         /* initialize new bus architecture */
  144         root_bus_configure();
  145 
  146 #ifdef DEV_ISA
  147         /*
  148          * Explicitly probe and attach ISA last.  The isa bus saves
  149          * it's device node at attach time for us here.
  150          */
  151         if (isa_bus_device)
  152                 isa_probe_children(isa_bus_device);
  153 #endif
  154 
  155         /*
  156          * Now we're ready to handle (pending) interrupts.
  157          * XXX this is slightly misplaced.
  158          */
  159         spl0();
  160 }
  161 
  162 static void
  163 configure_final(dummy)
  164         void *dummy;
  165 {
  166         int i;
  167 
  168         cninit_finish(); 
  169 
  170         if (bootverbose) {
  171 
  172 #ifdef APIC_IO
  173                 imen_dump();
  174 #endif /* APIC_IO */
  175 
  176                 /*
  177                  * Print out the BIOS's idea of the disk geometries.
  178                  */
  179                 printf("BIOS Geometries:\n");
  180                 for (i = 0; i < N_BIOS_GEOM; i++) {
  181                         unsigned long bios_geom;
  182                         int max_cylinder, max_head, max_sector;
  183 
  184                         bios_geom = bootinfo.bi_bios_geom[i];
  185 
  186                         /*
  187                          * XXX the bootstrap punts a 1200K floppy geometry
  188                          * when the get-disk-geometry interrupt fails.  Skip
  189                          * drives that have this geometry.
  190                          */
  191                         if (bios_geom == 0x4f010f)
  192                                 continue;
  193 
  194                         printf(" %x:%08lx ", i, bios_geom);
  195                         max_cylinder = bios_geom >> 16;
  196                         max_head = (bios_geom >> 8) & 0xff;
  197                         max_sector = bios_geom & 0xff;
  198                         printf(
  199                 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n",
  200                                max_cylinder, max_cylinder + 1,
  201                                max_head, max_head + 1,
  202                                max_sector, max_sector);
  203                 }
  204                 printf(" %d accounted for\n", bootinfo.bi_n_bios_used);
  205 
  206                 printf("Device configuration finished.\n");
  207         }
  208         cold = 0;
  209 }
  210 
  211 /*
  212  * Do legacy root filesystem discovery.
  213  */
  214 void
  215 cpu_rootconf()
  216 {
  217 #ifdef BOOTP
  218         bootpc_init();
  219 #endif
  220 #if defined(NFSCLIENT) && defined(NFS_ROOT)
  221 #if !defined(BOOTP_NFSROOT)
  222         nfs_setup_diskless();
  223         if (nfs_diskless_valid)
  224 #endif
  225                 rootdevnames[0] = "nfs:";
  226 #endif
  227 }
  228 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, cpu_rootconf, NULL)

Cache object: eb8659c476dae7a72a939a27eafbcad1


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