main.c revision 235158
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__FBSDID("$FreeBSD: head/sys/boot/i386/loader/main.c 235158 2012-05-09 08:23:24Z avg $"); 29 30/* 31 * MD bootstrap main() and assorted miscellaneous 32 * commands. 33 */ 34 35#include <stand.h> 36#include <stddef.h> 37#include <string.h> 38#include <machine/bootinfo.h> 39#include <machine/psl.h> 40#include <sys/reboot.h> 41 42#include "bootstrap.h" 43#include "common/bootargs.h" 44#include "libi386/libi386.h" 45#include "btxv86.h" 46 47CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE); 48CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO); 49CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS); 50CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE); 51 52/* Arguments passed in from the boot1/boot2 loader */ 53static struct bootargs *kargs; 54 55static u_int32_t initial_howto; 56static u_int32_t initial_bootdev; 57static struct bootinfo *initial_bootinfo; 58 59struct arch_switch archsw; /* MI/MD interface boundary */ 60 61static void extract_currdev(void); 62static int isa_inb(int port); 63static void isa_outb(int port, int value); 64void exit(int code); 65 66/* from vers.c */ 67extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 68 69/* XXX debugging */ 70extern char end[]; 71 72static void *heap_top; 73static void *heap_bottom; 74 75int 76main(void) 77{ 78 int i; 79 80 /* Pick up arguments */ 81 kargs = (void *)__args; 82 initial_howto = kargs->howto; 83 initial_bootdev = kargs->bootdev; 84 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 85 86 /* Initialize the v86 register set to a known-good state. */ 87 bzero(&v86, sizeof(v86)); 88 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 89 90 /* 91 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 92 */ 93 bios_getmem(); 94 95#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \ 96 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) 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#endif 104 { 105 heap_top = (void *)PTOV(bios_basemem); 106 heap_bottom = (void *)end; 107 } 108 setheap(heap_bottom, heap_top); 109 110 /* 111 * XXX Chicken-and-egg problem; we want to have console output early, but some 112 * console attributes may depend on reading from eg. the boot device, which we 113 * can't do yet. 114 * 115 * We can use printf() etc. once this is done. 116 * If the previous boot stage has requested a serial console, prefer that. 117 */ 118 bi_setboothowto(initial_howto); 119 if (initial_howto & RB_MULTIPLE) { 120 if (initial_howto & RB_SERIAL) 121 setenv("console", "comconsole vidconsole", 1); 122 else 123 setenv("console", "vidconsole comconsole", 1); 124 } else if (initial_howto & RB_SERIAL) 125 setenv("console", "comconsole", 1); 126 else if (initial_howto & RB_MUTE) 127 setenv("console", "nullconsole", 1); 128 cons_probe(); 129 130 /* 131 * Initialise the block cache 132 */ 133 bcache_init(32, 512); /* 16k cache XXX tune this */ 134 135 /* 136 * Special handling for PXE and CD booting. 137 */ 138 if (kargs->bootinfo == 0) { 139 /* 140 * We only want the PXE disk to try to init itself in the below 141 * walk through devsw if we actually booted off of PXE. 142 */ 143 if (kargs->bootflags & KARGS_FLAGS_PXE) 144 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 145 else if (kargs->bootflags & KARGS_FLAGS_CD) 146 bc_add(initial_bootdev); 147 } 148 149 archsw.arch_autoload = i386_autoload; 150 archsw.arch_getdev = i386_getdev; 151 archsw.arch_copyin = i386_copyin; 152 archsw.arch_copyout = i386_copyout; 153 archsw.arch_readin = i386_readin; 154 archsw.arch_isainb = isa_inb; 155 archsw.arch_isaoutb = isa_outb; 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 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 164 if (initial_bootinfo != NULL) { 165 initial_bootinfo->bi_basemem = bios_basemem / 1024; 166 initial_bootinfo->bi_extmem = bios_extmem / 1024; 167 } 168 169 /* detect ACPI for future reference */ 170 biosacpi_detect(); 171 172 /* detect SMBIOS for future reference */ 173 smbios_detect(); 174 175 printf("\n"); 176 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 177 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 178 179 extract_currdev(); /* set $currdev and $loaddev */ 180 setenv("LINES", "24", 1); /* optional */ 181 182 bios_getsmap(); 183 184 interact(); /* doesn't return */ 185 186 /* if we ever get here, it is an error */ 187 return (1); 188} 189 190/* 191 * Set the 'current device' by (if possible) recovering the boot device as 192 * supplied by the initial bootstrap. 193 * 194 * XXX should be extended for netbooting. 195 */ 196static void 197extract_currdev(void) 198{ 199 struct i386_devdesc new_currdev; 200 int biosdev = -1; 201 202 /* Assume we are booting from a BIOS disk by default */ 203 new_currdev.d_dev = &biosdisk; 204 205 /* new-style boot loaders such as pxeldr and cdldr */ 206 if (kargs->bootinfo == 0) { 207 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 208 /* we are booting from a CD with cdboot */ 209 new_currdev.d_dev = &bioscd; 210 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 211 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 212 /* we are booting from pxeldr */ 213 new_currdev.d_dev = &pxedisk; 214 new_currdev.d_unit = 0; 215 } else { 216 /* we don't know what our boot device is */ 217 new_currdev.d_kind.biosdisk.slice = -1; 218 new_currdev.d_kind.biosdisk.partition = 0; 219 biosdev = -1; 220 } 221 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 222 /* The passed-in boot device is bad */ 223 new_currdev.d_kind.biosdisk.slice = -1; 224 new_currdev.d_kind.biosdisk.partition = 0; 225 biosdev = -1; 226 } else { 227 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 228 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 229 biosdev = initial_bootinfo->bi_bios_dev; 230 231 /* 232 * If we are booted by an old bootstrap, we have to guess at the BIOS 233 * unit number. We will lose if there is more than one disk type 234 * and we are not booting from the lowest-numbered disk type 235 * (ie. SCSI when IDE also exists). 236 */ 237 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 238 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 239 } 240 new_currdev.d_type = new_currdev.d_dev->dv_type; 241 242 /* 243 * If we are booting off of a BIOS disk and we didn't succeed in determining 244 * which one we booted off of, just use disk0: as a reasonable default. 245 */ 246 if ((new_currdev.d_type == biosdisk.dv_type) && 247 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 248 printf("Can't work out which disk we are booting from.\n" 249 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 250 new_currdev.d_unit = 0; 251 } 252 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 253 i386_setcurrdev, env_nounset); 254 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 255 env_nounset); 256 257#ifdef LOADER_ZFS_SUPPORT 258 /* 259 * If we were started from a ZFS-aware boot2, we can work out 260 * which ZFS pool we are booting from. 261 */ 262 if (kargs->bootflags & KARGS_FLAGS_ZFS) { 263 /* 264 * Dig out the pool guid and convert it to a 'unit number' 265 */ 266 uint64_t guid; 267 int unit; 268 char devname[32]; 269 extern int zfs_guid_to_unit(uint64_t); 270 271 guid = kargs->zfspool; 272 unit = zfs_guid_to_unit(guid); 273 if (unit >= 0) { 274 sprintf(devname, "zfs%d", unit); 275 setenv("currdev", devname, 1); 276 } 277 } 278#endif 279} 280 281COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 282 283static int 284command_reboot(int argc, char *argv[]) 285{ 286 int i; 287 288 for (i = 0; devsw[i] != NULL; ++i) 289 if (devsw[i]->dv_cleanup != NULL) 290 (devsw[i]->dv_cleanup)(); 291 292 printf("Rebooting...\n"); 293 delay(1000000); 294 __exit(0); 295} 296 297/* provide this for panic, as it's not in the startup code */ 298void 299exit(int code) 300{ 301 __exit(code); 302} 303 304COMMAND_SET(heap, "heap", "show heap usage", command_heap); 305 306static int 307command_heap(int argc, char *argv[]) 308{ 309 mallocstats(); 310 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 311 sbrk(0), heap_top); 312 return(CMD_OK); 313} 314 315/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 316static int 317isa_inb(int port) 318{ 319 u_char data; 320 321 if (__builtin_constant_p(port) && 322 (((port) & 0xffff) < 0x100) && 323 ((port) < 0x10000)) { 324 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 325 } else { 326 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 327 } 328 return(data); 329} 330 331static void 332isa_outb(int port, int value) 333{ 334 u_char al = value; 335 336 if (__builtin_constant_p(port) && 337 (((port) & 0xffff) < 0x100) && 338 ((port) < 0x10000)) { 339 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 340 } else { 341 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 342 } 343} 344 345