FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/autoconf.c

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)autoconf.c    7.1 (Berkeley) 5/9/91
     * $FreeBSD: releng/5.0/sys/i386/i386/autoconf.c 103770 2002-09-22 00:59:02Z jake $
     */
    
    /*
     * Setup the system to run on the current machine.
     *
     * Configure() is called at boot time and initializes the vba
     * device tables and the memory controller monitoring.  Available
     * devices are determined (from possibilities mentioned in ioconf.c),
     * and the drivers are initialized.
     */
    #include "opt_bootp.h"
    #include "opt_isa.h"
    #include "opt_nfs.h"
    #include "opt_nfsroot.h"
    #include "opt_bus.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/reboot.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mount.h>
    #include <sys/cons.h>
    
    #include <sys/socket.h>
    #include <net/if.h>
    #include <net/if_dl.h>
    #include <net/if_types.h>
    #include <net/if_var.h>
    #include <net/ethernet.h>
    #include <netinet/in.h>
    #include <nfs/rpcv2.h>
    #include <nfs/nfsproto.h>
    #include <nfsclient/nfs.h>
    #include <nfsclient/nfsdiskless.h>
    
    #include <machine/bootinfo.h>
    #include <machine/md_var.h>
    #ifdef APIC_IO
    #include <machine/smp.h>
    #else
    #include <i386/isa/icu.h>
    #endif /* APIC_IO */
    
    #ifdef DEV_ISA
    #include <isa/isavar.h>
    
    device_t isa_bus_device = 0;
    #endif
    
    static void     configure_first(void *);
    static void     configure(void *);
    static void     configure_final(void *);
    
    SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
    /* SI_ORDER_SECOND is hookable */
    SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
    /* SI_ORDER_MIDDLE is hookable */
    SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
    
   device_t nexus_dev;
   
   /*
    * Determine i/o configuration for a machine.
    */
   static void
   configure_first(dummy)
           void *dummy;
   {
   }
   
   static void
   configure(dummy)
           void *dummy;
   {
   
           /*
            * Activate the ICU's.  Note that we are explicitly at splhigh()
            * at present as we have no way to disable stray PCI level triggered
            * interrupts until the devices have had a driver attached.  This
            * is particularly a problem when the interrupts are shared.  For
            * example, if IRQ 10 is shared between a disk and network device
            * and the disk device generates an interrupt, if we "activate"
            * IRQ 10 when the network driver is set up, then we will get
            * recursive interrupt 10's as nothing will know how to turn off
            * the disk device's interrupt.
            *
            * Having the ICU's active means we can probe interrupt routing to
            * see if a device causes the corresponding pending bit to be set.
            *
            * This is all rather inconvenient.
            */
   #ifdef APIC_IO
           bsp_apic_configure();
           enable_intr();
   #else
           enable_intr();
           INTREN(IRQ_SLAVE);
   #endif /* APIC_IO */
   
           /* nexus0 is the top of the i386 device tree */
           device_add_child(root_bus, "nexus", 0);
   
           /* initialize new bus architecture */
           root_bus_configure();
   
   #ifdef DEV_ISA
           /*
            * Explicitly probe and attach ISA last.  The isa bus saves
            * it's device node at attach time for us here.
            */
           if (isa_bus_device)
                   isa_probe_children(isa_bus_device);
   #endif
   
           /*
            * Now we're ready to handle (pending) interrupts.
            * XXX this is slightly misplaced.
            */
           spl0();
   }
   
   static void
   configure_final(dummy)
           void *dummy;
   {
           int i;
   
           cninit_finish(); 
   
           if (bootverbose) {
   
   #ifdef APIC_IO
                   imen_dump();
   #endif /* APIC_IO */
   
                   /*
                    * Print out the BIOS's idea of the disk geometries.
                    */
                   printf("BIOS Geometries:\n");
                   for (i = 0; i < N_BIOS_GEOM; i++) {
                           unsigned long bios_geom;
                           int max_cylinder, max_head, max_sector;
   
                           bios_geom = bootinfo.bi_bios_geom[i];
   
                           /*
                            * XXX the bootstrap punts a 1200K floppy geometry
                            * when the get-disk-geometry interrupt fails.  Skip
                            * drives that have this geometry.
                            */
                           if (bios_geom == 0x4f010f)
                                   continue;
   
                           printf(" %x:%08lx ", i, bios_geom);
                           max_cylinder = bios_geom >> 16;
                           max_head = (bios_geom >> 8) & 0xff;
                           max_sector = bios_geom & 0xff;
                           printf(
                   "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n",
                                  max_cylinder, max_cylinder + 1,
                                  max_head, max_head + 1,
                                  max_sector, max_sector);
                   }
                   printf(" %d accounted for\n", bootinfo.bi_n_bios_used);
   
                   printf("Device configuration finished.\n");
           }
           cold = 0;
   }
   
   /*
    * Do legacy root filesystem discovery.
    */
   void
   cpu_rootconf()
   {
   #ifdef BOOTP
           bootpc_init();
   #endif
   #if defined(NFSCLIENT) && defined(NFS_ROOT)
   #if !defined(BOOTP_NFSROOT)
           nfs_setup_diskless();
           if (nfs_diskless_valid)
   #endif
                   rootdevnames[0] = "nfs:";
   #endif
   }
   SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, cpu_rootconf, NULL)

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