main.c revision 200216
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 200216 2009-12-07 16:00:59Z jhb $"); 29 30/* 31 * MD bootstrap main() and assorted miscellaneous 32 * commands. 33 */ 34 35#include <stand.h> 36#include <string.h> 37#include <machine/bootinfo.h> 38#include <machine/psl.h> 39#include <sys/reboot.h> 40 41#include "bootstrap.h" 42#include "libi386/libi386.h" 43#include "btxv86.h" 44 45#define KARGS_FLAGS_CD 0x1 46#define KARGS_FLAGS_PXE 0x2 47#define KARGS_FLAGS_ZFS 0x4 48 49/* Arguments passed in from the boot1/boot2 loader */ 50static struct 51{ 52 u_int32_t howto; 53 u_int32_t bootdev; 54 u_int32_t bootflags; 55 union { 56 struct { 57 u_int32_t pxeinfo; 58 u_int32_t res2; 59 }; 60 uint64_t zfspool; 61 }; 62 u_int32_t bootinfo; 63} *kargs; 64 65static u_int32_t initial_howto; 66static u_int32_t initial_bootdev; 67static struct bootinfo *initial_bootinfo; 68 69struct arch_switch archsw; /* MI/MD interface boundary */ 70 71static void extract_currdev(void); 72static int isa_inb(int port); 73static void isa_outb(int port, int value); 74void exit(int code); 75 76/* from vers.c */ 77extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 78 79/* XXX debugging */ 80extern char end[]; 81 82static void *heap_top; 83static void *heap_bottom; 84 85int 86main(void) 87{ 88 int i; 89 90 /* Pick up arguments */ 91 kargs = (void *)__args; 92 initial_howto = kargs->howto; 93 initial_bootdev = kargs->bootdev; 94 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 95 96 /* Initialize the v86 register set to a known-good state. */ 97 bzero(&v86, sizeof(v86)); 98 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 99 100 /* 101 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 102 */ 103 bios_getmem(); 104 105#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \ 106 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) 107 heap_top = PTOV(memtop_copyin); 108 memtop_copyin -= 0x300000; 109 heap_bottom = PTOV(memtop_copyin); 110#else 111 heap_top = (void *)bios_basemem; 112 heap_bottom = (void *)end; 113#endif 114 setheap(heap_bottom, heap_top); 115 116 /* 117 * XXX Chicken-and-egg problem; we want to have console output early, but some 118 * console attributes may depend on reading from eg. the boot device, which we 119 * can't do yet. 120 * 121 * We can use printf() etc. once this is done. 122 * If the previous boot stage has requested a serial console, prefer that. 123 */ 124 bi_setboothowto(initial_howto); 125 if (initial_howto & RB_MULTIPLE) { 126 if (initial_howto & RB_SERIAL) 127 setenv("console", "comconsole vidconsole", 1); 128 else 129 setenv("console", "vidconsole comconsole", 1); 130 } else if (initial_howto & RB_SERIAL) 131 setenv("console", "comconsole", 1); 132 else if (initial_howto & RB_MUTE) 133 setenv("console", "nullconsole", 1); 134 cons_probe(); 135 136 /* 137 * Initialise the block cache 138 */ 139 bcache_init(32, 512); /* 16k cache XXX tune this */ 140 141 /* 142 * Special handling for PXE and CD booting. 143 */ 144 if (kargs->bootinfo == 0) { 145 /* 146 * We only want the PXE disk to try to init itself in the below 147 * walk through devsw if we actually booted off of PXE. 148 */ 149 if (kargs->bootflags & KARGS_FLAGS_PXE) 150 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 151 else if (kargs->bootflags & KARGS_FLAGS_CD) 152 bc_add(initial_bootdev); 153 } 154 155 archsw.arch_autoload = i386_autoload; 156 archsw.arch_getdev = i386_getdev; 157 archsw.arch_copyin = i386_copyin; 158 archsw.arch_copyout = i386_copyout; 159 archsw.arch_readin = i386_readin; 160 archsw.arch_isainb = isa_inb; 161 archsw.arch_isaoutb = isa_outb; 162 163 /* 164 * March through the device switch probing for things. 165 */ 166 for (i = 0; devsw[i] != NULL; i++) 167 if (devsw[i]->dv_init != NULL) 168 (devsw[i]->dv_init)(); 169 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 170 if (initial_bootinfo != NULL) { 171 initial_bootinfo->bi_basemem = bios_basemem / 1024; 172 initial_bootinfo->bi_extmem = bios_extmem / 1024; 173 } 174 175 /* detect ACPI for future reference */ 176 biosacpi_detect(); 177 178 /* detect SMBIOS for future reference */ 179 smbios_detect(); 180 181 printf("\n"); 182 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 183 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 184 185 extract_currdev(); /* set $currdev and $loaddev */ 186 setenv("LINES", "24", 1); /* optional */ 187 188 bios_getsmap(); 189 190 interact(); /* doesn't return */ 191 192 /* if we ever get here, it is an error */ 193 return (1); 194} 195 196/* 197 * Set the 'current device' by (if possible) recovering the boot device as 198 * supplied by the initial bootstrap. 199 * 200 * XXX should be extended for netbooting. 201 */ 202static void 203extract_currdev(void) 204{ 205 struct i386_devdesc new_currdev; 206 int biosdev = -1; 207 208 /* Assume we are booting from a BIOS disk by default */ 209 new_currdev.d_dev = &biosdisk; 210 211 /* new-style boot loaders such as pxeldr and cdldr */ 212 if (kargs->bootinfo == 0) { 213 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 214 /* we are booting from a CD with cdboot */ 215 new_currdev.d_dev = &bioscd; 216 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 217 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 218 /* we are booting from pxeldr */ 219 new_currdev.d_dev = &pxedisk; 220 new_currdev.d_unit = 0; 221 } else { 222 /* we don't know what our boot device is */ 223 new_currdev.d_kind.biosdisk.slice = -1; 224 new_currdev.d_kind.biosdisk.partition = 0; 225 biosdev = -1; 226 } 227 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 228 /* The passed-in boot device is bad */ 229 new_currdev.d_kind.biosdisk.slice = -1; 230 new_currdev.d_kind.biosdisk.partition = 0; 231 biosdev = -1; 232 } else { 233 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 234 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 235 biosdev = initial_bootinfo->bi_bios_dev; 236 237 /* 238 * If we are booted by an old bootstrap, we have to guess at the BIOS 239 * unit number. We will lose if there is more than one disk type 240 * and we are not booting from the lowest-numbered disk type 241 * (ie. SCSI when IDE also exists). 242 */ 243 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 244 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 245 } 246 new_currdev.d_type = new_currdev.d_dev->dv_type; 247 248 /* 249 * If we are booting off of a BIOS disk and we didn't succeed in determining 250 * which one we booted off of, just use disk0: as a reasonable default. 251 */ 252 if ((new_currdev.d_type == biosdisk.dv_type) && 253 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 254 printf("Can't work out which disk we are booting from.\n" 255 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 256 new_currdev.d_unit = 0; 257 } 258 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 259 i386_setcurrdev, env_nounset); 260 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 261 env_nounset); 262 263#ifdef LOADER_ZFS_SUPPORT 264 /* 265 * If we were started from a ZFS-aware boot2, we can work out 266 * which ZFS pool we are booting from. 267 */ 268 if (kargs->bootflags & KARGS_FLAGS_ZFS) { 269 /* 270 * Dig out the pool guid and convert it to a 'unit number' 271 */ 272 uint64_t guid; 273 int unit; 274 char devname[32]; 275 extern int zfs_guid_to_unit(uint64_t); 276 277 guid = kargs->zfspool; 278 unit = zfs_guid_to_unit(guid); 279 if (unit >= 0) { 280 sprintf(devname, "zfs%d", unit); 281 setenv("currdev", devname, 1); 282 } 283 } 284#endif 285} 286 287COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 288 289static int 290command_reboot(int argc, char *argv[]) 291{ 292 int i; 293 294 for (i = 0; devsw[i] != NULL; ++i) 295 if (devsw[i]->dv_cleanup != NULL) 296 (devsw[i]->dv_cleanup)(); 297 298 printf("Rebooting...\n"); 299 delay(1000000); 300 __exit(0); 301} 302 303/* provide this for panic, as it's not in the startup code */ 304void 305exit(int code) 306{ 307 __exit(code); 308} 309 310COMMAND_SET(heap, "heap", "show heap usage", command_heap); 311 312static int 313command_heap(int argc, char *argv[]) 314{ 315 mallocstats(); 316 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 317 sbrk(0), heap_top); 318 return(CMD_OK); 319} 320 321/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 322static int 323isa_inb(int port) 324{ 325 u_char data; 326 327 if (__builtin_constant_p(port) && 328 (((port) & 0xffff) < 0x100) && 329 ((port) < 0x10000)) { 330 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 331 } else { 332 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 333 } 334 return(data); 335} 336 337static void 338isa_outb(int port, int value) 339{ 340 u_char al = value; 341 342 if (__builtin_constant_p(port) && 343 (((port) & 0xffff) < 0x100) && 344 ((port) < 0x10000)) { 345 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 346 } else { 347 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 348 } 349} 350 351