usr/src/boot/sys/boot/i386/loader/main.c

   1 /*
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28
  29 /*
  30  * MD bootstrap main() and assorted miscellaneous
  31  * commands.
  32  */
  33
  34 #include <stand.h>
  35 #include <stddef.h>
  36 #include <string.h>
  37 #include <machine/bootinfo.h>
  38 #include <machine/cpufunc.h>
  39 #include <machine/psl.h>
  40 #include <sys/disk.h>
  41 #include <sys/param.h>
  42 #include <sys/reboot.h>
  43
  44 #include "bootstrap.h"
  45 #include "common/bootargs.h"
  46 #include "libi386/libi386.h"
  47 #include "libi386/smbios.h"
  48 #include "btxv86.h"
  49 #include "libzfs.h"
  50
  51 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
  52 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
  53 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
  54 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
  55
  56 /* Arguments passed in from the boot1/boot2 loader */
  57 static struct bootargs *kargs;
  58
  59 static u_int32_t        initial_howto;
  60 static u_int32_t        initial_bootdev;
  61 static struct bootinfo  *initial_bootinfo;
  62
  63 struct arch_switch      archsw;         /* MI/MD interface boundary */
  64
  65 static void             extract_currdev(void);
  66 static int              isa_inb(int port);
  67 static void             isa_outb(int port, int value);
  68 void                    exit(int code);
  69 static void             i386_zfs_probe(void);
  70
  71 /* XXX debugging */
  72 extern char end[];
  73
  74 static void *heap_top;
  75 static void *heap_bottom;
  76
  77 int
  78 main(void)
  79 {
  80     int                 i;
  81
  82     /* Pick up arguments */
  83     kargs = (void *)__args;
  84     initial_howto = kargs->howto;
  85     initial_bootdev = kargs->bootdev;
  86     initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
  87
  88     /* Initialize the v86 register set to a known-good state. */
  89     bzero(&v86, sizeof(v86));
  90     v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
  91
  92     /*
  93      * Initialise the heap as early as possible.  Once this is done, malloc() is usable.
  94      */
  95     bios_getmem();
  96
  97     if (high_heap_size > 0) {
  98         heap_top = PTOV(high_heap_base + high_heap_size);
  99         heap_bottom = PTOV(high_heap_base);
 100         if (high_heap_base < memtop_copyin)
 101             memtop_copyin = high_heap_base;
 102     } else {
 103         heap_top = (void *)PTOV(bios_basemem);
 104         heap_bottom = (void *)end;
 105     }
 106     setheap(heap_bottom, heap_top);
 107
 108     /*
 109      * XXX Chicken-and-egg problem; we want to have console output early, but some
 110      * console attributes may depend on reading from eg. the boot device, which we
 111      * can't do yet.
 112      *
 113      * We can use printf() etc. once this is done.
 114      * If the previous boot stage has requested a serial console, prefer that.
 115      */
 116     bi_setboothowto(initial_howto);
 117     if (initial_howto & RB_MULTIPLE) {
 118         if (initial_howto & RB_SERIAL)
 119             setenv("console", "ttya text", 1);
 120         else
 121             setenv("console", "text ttya", 1);
 122     } else if (initial_howto & RB_SERIAL)
 123         setenv("console", "ttya", 1);
 124     else if (initial_howto & RB_MUTE)
 125         setenv("console", "null", 1);
 126     cons_probe();
 127
 128     /*
 129      * Initialise the block cache. Set the upper limit.
 130      */
 131     bcache_init(32768, 512);
 132
 133     /*
 134      * Special handling for PXE and CD booting.
 135      */
 136     if (kargs->bootinfo == 0) {
 137         /*
 138          * We only want the PXE disk to try to init itself in the below
 139          * walk through devsw if we actually booted off of PXE.
 140          */
 141         if (kargs->bootflags & KARGS_FLAGS_PXE)
 142             pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
 143         else if (kargs->bootflags & KARGS_FLAGS_CD)
 144             bc_add(initial_bootdev);
 145     }
 146
 147     archsw.arch_autoload = i386_autoload;
 148     archsw.arch_getdev = i386_getdev;
 149     archsw.arch_copyin = i386_copyin;
 150     archsw.arch_copyout = i386_copyout;
 151     archsw.arch_readin = i386_readin;
 152     archsw.arch_isainb = isa_inb;
 153     archsw.arch_isaoutb = isa_outb;
 154     archsw.arch_loadaddr = i386_loadaddr;
 155     archsw.arch_zfs_probe = i386_zfs_probe;
 156
 157     /*
 158      * March through the device switch probing for things.
 159      */
 160     for (i = 0; devsw[i] != NULL; i++)
 161         if (devsw[i]->dv_init != NULL)
 162             (devsw[i]->dv_init)();
 163
 164     printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
 165     if (initial_bootinfo != NULL) {
 166         initial_bootinfo->bi_basemem = bios_basemem / 1024;
 167         initial_bootinfo->bi_extmem = bios_extmem / 1024;
 168     }
 169
 170     /* detect ACPI for future reference */
 171     biosacpi_detect();
 172
 173     /* detect SMBIOS for future reference */
 174     smbios_detect(NULL);
 175
 176     /* detect PCI BIOS for future reference */
 177     biospci_detect();
 178
 179     printf("\n%s", bootprog_info);
 180
 181     extract_currdev();                  /* set $currdev and $loaddev */
 182     autoload_font();                    /* Set up the font list for console. */
 183
 184     bi_isadir();
 185     bios_getsmap();
 186
 187     interact(NULL);
 188
 189     /* if we ever get here, it is an error */
 190     return (1);
 191 }
 192
 193 /*
 194  * Set the 'current device' by (if possible) recovering the boot device as
 195  * supplied by the initial bootstrap.
 196  *
 197  * XXX should be extended for netbooting.
 198  */
 199 static void
 200 extract_currdev(void)
 201 {
 202     struct i386_devdesc         new_currdev;
 203     struct zfs_boot_args        *zargs;
 204     int                         biosdev = -1;
 205
 206     /* Assume we are booting from a BIOS disk by default */
 207     new_currdev.dd.d_dev = &bioshd;
 208
 209     /* new-style boot loaders such as pxeldr and cdldr */
 210     if (kargs->bootinfo == 0) {
 211         if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
 212             /* we are booting from a CD with cdboot */
 213             new_currdev.dd.d_dev = &bioscd;
 214             new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
 215         } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
 216             /* we are booting from pxeldr */
 217             new_currdev.dd.d_dev = &pxedisk;
 218             new_currdev.dd.d_unit = 0;
 219         } else {
 220             /* we don't know what our boot device is */
 221             new_currdev.d_kind.biosdisk.slice = -1;
 222             new_currdev.d_kind.biosdisk.partition = 0;
 223             biosdev = -1;
 224         }
 225     } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
 226         zargs = NULL;
 227         /* check for new style extended argument */
 228         if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0)
 229             zargs = (struct zfs_boot_args *)(kargs + 1);
 230
 231         if (zargs != NULL &&
 232             zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
 233             /* sufficient data is provided */
 234             new_currdev.d_kind.zfs.pool_guid = zargs->pool;
 235             new_currdev.d_kind.zfs.root_guid = zargs->root;
 236         } else {
 237             /* old style zfsboot block */
 238             new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
 239             new_currdev.d_kind.zfs.root_guid = 0;
 240         }
 241         new_currdev.dd.d_dev = &zfs_dev;
 242     } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
 243         /* The passed-in boot device is bad */
 244         new_currdev.d_kind.biosdisk.slice = -1;
 245         new_currdev.d_kind.biosdisk.partition = 0;
 246         biosdev = -1;
 247     } else {
 248         new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
 249         new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
 250         biosdev = initial_bootinfo->bi_bios_dev;
 251
 252         /*
 253          * If we are booted by an old bootstrap, we have to guess at the BIOS
 254          * unit number.  We will lose if there is more than one disk type
 255          * and we are not booting from the lowest-numbered disk type
 256          * (ie. SCSI when IDE also exists).
 257          */
 258         if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2))   /* biosdev doesn't match major */
 259             biosdev = 0x80 + B_UNIT(initial_bootdev);           /* assume harddisk */
 260     }
 261
 262     /*
 263      * If we are booting off of a BIOS disk and we didn't succeed in determining
 264      * which one we booted off of, just use disk0: as a reasonable default.
 265      */
 266     if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) &&
 267         ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
 268         printf("Can't work out which disk we are booting from.\n"
 269                "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
 270         new_currdev.dd.d_unit = 0;
 271     }
 272
 273     env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
 274                i386_setcurrdev, env_nounset);
 275     env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
 276                env_nounset);
 277 }
 278
 279 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
 280
 281 static int
 282 command_reboot(int argc, char *argv[])
 283 {
 284     int i;
 285
 286     for (i = 0; devsw[i] != NULL; ++i)
 287         if (devsw[i]->dv_cleanup != NULL)
 288             (devsw[i]->dv_cleanup)();
 289
 290     printf("Rebooting...\n");
 291     delay(1000000);
 292     __exit(0);
 293 }
 294
 295 /* provide this for panic, as it's not in the startup code */
 296 void
 297 exit(int code)
 298 {
 299     __exit(code);
 300 }
 301
 302 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
 303
 304 static int
 305 command_heap(int argc, char *argv[])
 306 {
 307     mallocstats();
 308     printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
 309       sbrk(0), heap_top);
 310     return(CMD_OK);
 311 }
 312
 313 /* ISA bus access functions for PnP. */
 314 static int
 315 isa_inb(int port)
 316 {
 317
 318     return (inb(port));
 319 }
 320
 321 static void
 322 isa_outb(int port, int value)
 323 {
 324
 325     outb(port, value);
 326 }
 327
 328 static void
 329 i386_zfs_probe(void)
 330 {
 331     char devname[32];
 332     struct i386_devdesc dev;
 333
 334     /*
 335      * Open all the disks we can find and see if we can reconstruct
 336      * ZFS pools from them.
 337      */
 338     dev.dd.d_dev = &bioshd;
 339     for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
 340         snprintf(devname, sizeof (devname), "%s%d:", bioshd.dv_name,
 341             dev.dd.d_unit);
 342         zfs_probe_dev(devname, NULL);
 343     }
 344 }