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: stable/4/sys/i386/i386/autoconf.c 77863 2001-06-07 06:05:58Z dd $
   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_ffs.h"
   50 #include "opt_cd9660.h"
   51 #include "opt_nfs.h"
   52 #include "opt_nfsroot.h"
   53 #include "opt_bus.h"
   54 #include "opt_rootdevname.h"
   55 
   56 #include "isa.h"
   57 
   58 #include <sys/param.h>
   59 #include <sys/systm.h>
   60 #include <sys/bus.h>
   61 #include <sys/conf.h>
   62 #include <sys/disklabel.h>
   63 #include <sys/diskslice.h>
   64 #include <sys/reboot.h>
   65 #include <sys/kernel.h>
   66 #include <sys/malloc.h>
   67 #include <sys/mount.h>
   68 #include <sys/cons.h>
   69 
   70 #include <machine/bootinfo.h>
   71 #include <machine/ipl.h>
   72 #include <machine/md_var.h>
   73 #ifdef APIC_IO
   74 #include <machine/smp.h>
   75 #else
   76 #include <i386/isa/icu.h>
   77 #endif /* APIC_IO */
   78 
   79 #if NISA > 0
   80 #include <isa/isavar.h>
   81 
   82 device_t isa_bus_device = 0;
   83 #endif
   84 
   85 static void     configure_first __P((void *));
   86 static void     configure __P((void *));
   87 static void     configure_final __P((void *));
   88 
   89 #if defined(FFS) && defined(FFS_ROOT)
   90 static void     setroot __P((void));
   91 #endif
   92 
   93 #if defined(NFS) && defined(NFS_ROOT)
   94 static void     pxe_setup_nfsdiskless(void);
   95 #endif
   96 
   97 SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
   98 /* SI_ORDER_SECOND is hookable */
   99 SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
  100 /* SI_ORDER_MIDDLE is hookable */
  101 SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
  102 
  103 dev_t   rootdev = NODEV;
  104 dev_t   dumpdev = NODEV;
  105 
  106 device_t nexus_dev;
  107 
  108 /*
  109  * Determine i/o configuration for a machine.
  110  */
  111 static void
  112 configure_first(dummy)
  113         void *dummy;
  114 {
  115 }
  116 
  117 static void
  118 configure(dummy)
  119         void *dummy;
  120 {
  121 
  122         /*
  123          * Activate the ICU's.  Note that we are explicitly at splhigh()
  124          * at present as we have no way to disable stray PCI level triggered
  125          * interrupts until the devices have had a driver attached.  This
  126          * is particularly a problem when the interrupts are shared.  For
  127          * example, if IRQ 10 is shared between a disk and network device
  128          * and the disk device generates an interrupt, if we "activate"
  129          * IRQ 10 when the network driver is set up, then we will get
  130          * recursive interrupt 10's as nothing will know how to turn off
  131          * the disk device's interrupt.
  132          *
  133          * Having the ICU's active means we can probe interrupt routing to
  134          * see if a device causes the corresponding pending bit to be set.
  135          *
  136          * This is all rather inconvenient.
  137          */
  138 #ifdef APIC_IO
  139         bsp_apic_configure();
  140         enable_intr();
  141 #else
  142         enable_intr();
  143         INTREN(IRQ_SLAVE);
  144 #endif /* APIC_IO */
  145 
  146         /* nexus0 is the top of the i386 device tree */
  147         device_add_child(root_bus, "nexus", 0);
  148 
  149         /* initialize new bus architecture */
  150         root_bus_configure();
  151 
  152 #if NISA > 0
  153         /*
  154          * Explicitly probe and attach ISA last.  The isa bus saves
  155          * it's device node at attach time for us here.
  156          */
  157         if (isa_bus_device)
  158                 isa_probe_children(isa_bus_device);
  159 #endif
  160 
  161         /*
  162          * Now we're ready to handle (pending) interrupts.
  163          * XXX this is slightly misplaced.
  164          */
  165         spl0();
  166 
  167         /*
  168          * Allow lowering of the ipl to the lowest kernel level if we
  169          * panic (or call tsleep() before clearing `cold').  No level is
  170          * completely safe (since a panic may occur in a critical region
  171          * at splhigh()), but we want at least bio interrupts to work.
  172          */
  173         safepri = cpl;
  174 }
  175 
  176 static void
  177 configure_final(dummy)
  178         void *dummy;
  179 {
  180         int i;
  181 
  182         cninit_finish();
  183 
  184         if (bootverbose) {
  185 
  186 #ifdef APIC_IO
  187                 imen_dump();
  188 #endif /* APIC_IO */
  189 
  190                 /*
  191                  * Print out the BIOS's idea of the disk geometries.
  192                  */
  193                 printf("BIOS Geometries:\n");
  194                 for (i = 0; i < N_BIOS_GEOM; i++) {
  195                         unsigned long bios_geom;
  196                         int max_cylinder, max_head, max_sector;
  197 
  198                         bios_geom = bootinfo.bi_bios_geom[i];
  199 
  200                         /*
  201                          * XXX the bootstrap punts a 1200K floppy geometry
  202                          * when the get-disk-geometry interrupt fails.  Skip
  203                          * drives that have this geometry.
  204                          */
  205                         if (bios_geom == 0x4f010f)
  206                                 continue;
  207 
  208                         printf(" %x:%08lx ", i, bios_geom);
  209                         max_cylinder = bios_geom >> 16;
  210                         max_head = (bios_geom >> 8) & 0xff;
  211                         max_sector = bios_geom & 0xff;
  212                         printf(
  213                 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n",
  214                                max_cylinder, max_cylinder + 1,
  215                                max_head, max_head + 1,
  216                                max_sector, max_sector);
  217                 }
  218                 printf(" %d accounted for\n", bootinfo.bi_n_bios_used);
  219 
  220                 printf("Device configuration finished.\n");
  221         }
  222         cold = 0;
  223 }
  224 
  225 #ifdef BOOTP
  226 extern void bootpc_init(void);
  227 #endif
  228 /*
  229  * Do legacy root filesystem discovery.
  230  */
  231 void
  232 cpu_rootconf()
  233 {
  234 #ifdef BOOTP
  235         bootpc_init();
  236 #endif
  237 #if defined(NFS) && defined(NFS_ROOT)
  238 #if !defined(BOOTP_NFSROOT)
  239         pxe_setup_nfsdiskless();
  240         if (nfs_diskless_valid)
  241 #endif
  242                 rootdevnames[0] = "nfs:";
  243 #endif
  244 #if defined(FFS) && defined(FFS_ROOT)
  245         if (!rootdevnames[0])
  246                 setroot();
  247 #endif
  248 }
  249 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, cpu_rootconf, NULL)
  250 
  251 u_long  bootdev = 0;            /* not a dev_t - encoding is different */
  252 
  253 #if defined(FFS) && defined(FFS_ROOT)
  254 #define FDMAJOR         2
  255 #define FDUNITSHIFT     6
  256 
  257 /*
  258  * Attempt to find the device from which we were booted.
  259  * If we can do so, and not instructed not to do so,
  260  * set rootdevs[] and rootdevnames[] to correspond to the
  261  * boot device(s).
  262  *
  263  * This code survives in order to allow the system to be 
  264  * booted from legacy environments that do not correctly
  265  * populate the kernel environment. There are significant
  266  * restrictions on the bootability of the system in this
  267  * situation; it can only be mounting root from a 'da'
  268  * 'wd' or 'fd' device, and the root filesystem must be ufs.
  269  */
  270 static void
  271 setroot()
  272 {
  273         int majdev, mindev, unit, slice, part;
  274         dev_t newrootdev, dev;
  275         char partname[2];
  276         char *sname;
  277 
  278         if ((bootdev & B_MAGICMASK) != B_DEVMAGIC) {
  279                 printf("no B_DEVMAGIC (bootdev=%#lx)\n", bootdev);
  280                 return;
  281         }
  282         majdev = B_TYPE(bootdev);
  283         dev = makebdev(majdev, 0);
  284         if (devsw(dev) == NULL)
  285                 return;
  286         unit = B_UNIT(bootdev);
  287         slice = B_SLICE(bootdev);
  288         if (slice == WHOLE_DISK_SLICE)
  289                 slice = COMPATIBILITY_SLICE;
  290         if (slice < 0 || slice >= MAX_SLICES) {
  291                 printf("bad slice\n");
  292                 return;
  293         }
  294 
  295         /*
  296          * XXX kludge for inconsistent unit numbering and lack of slice
  297          * support for floppies.
  298          */
  299         if (majdev == FDMAJOR) {
  300                 slice = COMPATIBILITY_SLICE;
  301                 part = RAW_PART;
  302                 mindev = unit << FDUNITSHIFT;
  303         } else {
  304                 part = B_PARTITION(bootdev);
  305                 mindev = dkmakeminor(unit, slice, part);
  306         }
  307 
  308         newrootdev = makebdev(majdev, mindev);
  309         sname = dsname(newrootdev, unit, slice, part, partname);
  310         rootdevnames[0] = malloc(strlen(sname) + 6, M_DEVBUF, M_NOWAIT);
  311         sprintf(rootdevnames[0], "ufs:%s%s", sname, partname);
  312 
  313         /*
  314          * For properly dangerously dedicated disks (ones with a historical
  315          * bogus partition table), the boot blocks will give slice = 4, but
  316          * the kernel will only provide the compatibility slice since it
  317          * knows that slice 4 is not a real slice.  Arrange to try mounting
  318          * the compatibility slice as root if mounting the slice passed by
  319          * the boot blocks fails.  This handles the dangerously dedicated
  320          * case and perhaps others.
  321          */
  322         if (slice == COMPATIBILITY_SLICE)
  323                 return;
  324         slice = COMPATIBILITY_SLICE;
  325         sname = dsname(newrootdev, unit, slice, part, partname);
  326         rootdevnames[1] = malloc(strlen(sname) + 6, M_DEVBUF, M_NOWAIT);
  327         sprintf(rootdevnames[1], "ufs:%s%s", sname, partname);
  328 }
  329 #endif
  330 
  331 #if defined(NFS) && defined(NFS_ROOT)
  332 
  333 #include <sys/socket.h>
  334 #include <net/if.h>
  335 #include <net/if_dl.h>
  336 #include <net/if_types.h>
  337 #include <net/if_var.h>
  338 #include <net/ethernet.h>
  339 #include <netinet/in.h>
  340 #include <nfs/rpcv2.h>
  341 #include <nfs/nfsproto.h>
  342 #include <nfs/nfs.h>
  343 #include <nfs/nfsdiskless.h>
  344 
  345 extern struct nfs_diskless      nfs_diskless;
  346 
  347 static int
  348 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  349 {
  350         u_int32_t       a[4];
  351         char            *cp;
  352 
  353         bzero(sa, sizeof(*sa));
  354         sa->sin_len = sizeof(*sa);
  355         sa->sin_family = AF_INET;
  356 
  357         if ((cp = getenv(ev)) == NULL)
  358                 return(1);
  359         if (sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]) != 4)
  360                 return(1);
  361         /* XXX is this ordering correct? */
  362         sa->sin_addr.s_addr = (a[3] << 24) + (a[2] << 16) + (a[1] << 8) + a[0];
  363         return(0);
  364 }
  365 
  366 static int
  367 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  368 {
  369         char            *cp;
  370         u_int32_t       a[6];
  371 
  372         bzero(sa, sizeof(*sa));
  373         sa->sdl_len = sizeof(*sa);
  374         sa->sdl_family = AF_LINK;
  375         sa->sdl_type = IFT_ETHER;
  376         sa->sdl_alen = ETHER_ADDR_LEN;
  377         if ((cp = getenv(ev)) == NULL)
  378                 return(1);
  379         if (sscanf(cp, "%x:%x:%x:%x:%x:%x", &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]) != 6)
  380                 return(1);
  381         sa->sdl_data[0] = a[0];
  382         sa->sdl_data[1] = a[1];
  383         sa->sdl_data[2] = a[2];
  384         sa->sdl_data[3] = a[3];
  385         sa->sdl_data[4] = a[4];
  386         sa->sdl_data[5] = a[5];
  387         return(0);
  388 }
  389 
  390 static int
  391 decode_nfshandle(char *ev, u_char *fh) 
  392 {
  393         u_char  *cp;
  394         int     len, val;
  395 
  396         if (((cp = getenv(ev)) == NULL) || (strlen(cp) < 2) || (*cp != 'X'))
  397                 return(0);
  398         len = 0;
  399         cp++;
  400         for (;;) {
  401                 if (*cp == 'X')
  402                         return(len);
  403                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff))
  404                         return(0);
  405                 *(fh++) = val;
  406                 len++;
  407                 cp += 2;
  408                 if (len > NFSX_V2FH)
  409                     return(0);
  410         }
  411 }
  412 
  413 /*
  414  * Populate the essential fields in the nfsv3_diskless structure.
  415  *
  416  * The loader is expected to export the following environment variables:
  417  *
  418  * boot.netif.ip                IP address on boot interface
  419  * boot.netif.netmask           netmask on boot interface
  420  * boot.netif.gateway           default gateway (optional)
  421  * boot.netif.hwaddr            hardware address of boot interface
  422  * boot.nfsroot.server          IP address of root filesystem server
  423  * boot.nfsroot.path            path of the root filesystem on server
  424  * boot.nfsroot.nfshandle       NFS handle for root filesystem on server
  425  */
  426 static void
  427 pxe_setup_nfsdiskless()
  428 {
  429         struct nfs_diskless     *nd = &nfs_diskless;
  430         struct ifnet            *ifp;
  431         struct ifaddr           *ifa;
  432         struct sockaddr_dl      *sdl, ourdl;
  433         struct sockaddr_in      myaddr, netmask;
  434         char                    *cp;
  435 
  436         /* set up interface */
  437         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
  438                 return;
  439         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
  440                 printf("PXE: no netmask\n");
  441                 return;
  442         }
  443         bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
  444         bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
  445         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
  446                 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  447         bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
  448 
  449         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  450                 printf("PXE: no hardware address\n");
  451                 return;
  452         }
  453         ifa = NULL;
  454         ifp = TAILQ_FIRST(&ifnet);
  455         TAILQ_FOREACH(ifp, &ifnet, if_link) {
  456                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  457                         if ((ifa->ifa_addr->sa_family == AF_LINK) &&
  458                             (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
  459                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  460                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  461                                     !bcmp(sdl->sdl_data + sdl->sdl_nlen,
  462                                           ourdl.sdl_data + ourdl.sdl_nlen, 
  463                                           sdl->sdl_alen))
  464                                     goto match_done;
  465                         }
  466                 }
  467         }
  468         printf("PXE: no interface\n");
  469         return; /* no matching interface */
  470 match_done:
  471         sprintf(nd->myif.ifra_name, "%s%d", ifp->if_name, ifp->if_unit);
  472 
  473         
  474         /* set up gateway */
  475         inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  476 
  477         /* XXX set up swap? */
  478 
  479         /* set up root mount */
  480         nd->root_args.rsize = 8192;             /* XXX tunable? */
  481         nd->root_args.wsize = 8192;
  482         nd->root_args.sotype = SOCK_DGRAM;
  483         nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
  484         if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
  485                 printf("PXE: no server\n");
  486                 return;
  487         }
  488         nd->root_saddr.sin_port = htons(NFS_PORT);
  489         if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
  490                 printf("PXE: no NFS handle\n");
  491                 return;
  492         }
  493         if ((cp = getenv("boot.nfsroot.path")) != NULL)
  494                 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  495 
  496         nfs_diskless_valid = 1;
  497 }
  498 #endif

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