main.c revision 119482
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 119482 2003-08-25 23:28:32Z obrien $"); 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 <sys/reboot.h> 39 40#include "bootstrap.h" 41#include "libi386/libi386.h" 42#include "btxv86.h" 43 44#define KARGS_FLAGS_CD 0x1 45#define KARGS_FLAGS_PXE 0x2 46 47/* Arguments passed in from the boot1/boot2 loader */ 48static struct 49{ 50 u_int32_t howto; 51 u_int32_t bootdev; 52 u_int32_t bootflags; 53 u_int32_t pxeinfo; 54 u_int32_t res2; 55 u_int32_t bootinfo; 56} *kargs; 57 58static u_int32_t initial_howto; 59static u_int32_t initial_bootdev; 60static struct bootinfo *initial_bootinfo; 61 62struct arch_switch archsw; /* MI/MD interface boundary */ 63 64static void extract_currdev(void); 65static int isa_inb(int port); 66static void isa_outb(int port, int value); 67void exit(int code); 68 69/* from vers.c */ 70extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 71 72/* XXX debugging */ 73extern char end[]; 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 /* 87 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 88 */ 89 bios_getmem(); 90 91 setheap((void *)end, (void *)bios_basemem); 92 93 /* 94 * XXX Chicken-and-egg problem; we want to have console output early, but some 95 * console attributes may depend on reading from eg. the boot device, which we 96 * can't do yet. 97 * 98 * We can use printf() etc. once this is done. 99 * If the previous boot stage has requested a serial console, prefer that. 100 */ 101 if (initial_howto & RB_SERIAL) 102 setenv("console", "comconsole", 1); 103 if (initial_howto & RB_MUTE) 104 setenv("console", "nullconsole", 1); 105 cons_probe(); 106 107 /* 108 * Initialise the block cache 109 */ 110 bcache_init(32, 512); /* 16k cache XXX tune this */ 111 112 /* 113 * Special handling for PXE and CD booting. 114 */ 115 if (kargs->bootinfo == NULL) { 116 /* 117 * We only want the PXE disk to try to init itself in the below 118 * walk through devsw if we actually booted off of PXE. 119 */ 120 if (kargs->bootflags & KARGS_FLAGS_PXE) 121 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 122 else if (kargs->bootflags & KARGS_FLAGS_CD) 123 bc_add(initial_bootdev); 124 } 125 126 /* 127 * March through the device switch probing for things. 128 */ 129 for (i = 0; devsw[i] != NULL; i++) 130 if (devsw[i]->dv_init != NULL) 131 (devsw[i]->dv_init)(); 132 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 133 if (initial_bootinfo != NULL) { 134 initial_bootinfo->bi_basemem = bios_basemem / 1024; 135 initial_bootinfo->bi_extmem = bios_extmem / 1024; 136 } 137 138 /* detect ACPI for future reference */ 139 biosacpi_detect(); 140 141 printf("\n"); 142 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 143 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 144 145 extract_currdev(); /* set $currdev and $loaddev */ 146 setenv("LINES", "24", 1); /* optional */ 147 148 bios_getsmap(); 149 150 archsw.arch_autoload = i386_autoload; 151 archsw.arch_getdev = i386_getdev; 152 archsw.arch_copyin = i386_copyin; 153 archsw.arch_copyout = i386_copyout; 154 archsw.arch_readin = i386_readin; 155 archsw.arch_isainb = isa_inb; 156 archsw.arch_isaoutb = isa_outb; 157 158 interact(); /* doesn't return */ 159 160 /* if we ever get here, it is an error */ 161 return (1); 162} 163 164/* 165 * Set the 'current device' by (if possible) recovering the boot device as 166 * supplied by the initial bootstrap. 167 * 168 * XXX should be extended for netbooting. 169 */ 170static void 171extract_currdev(void) 172{ 173 struct i386_devdesc new_currdev; 174 int major, biosdev = -1; 175 176 /* Assume we are booting from a BIOS disk by default */ 177 new_currdev.d_dev = &biosdisk; 178 179 /* new-style boot loaders such as pxeldr and cdldr */ 180 if (kargs->bootinfo == NULL) { 181 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 182 /* we are booting from a CD with cdboot */ 183 new_currdev.d_dev = &bioscd; 184 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev); 185 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 186 /* we are booting from pxeldr */ 187 new_currdev.d_dev = &pxedisk; 188 new_currdev.d_kind.netif.unit = 0; 189 } else { 190 /* we don't know what our boot device is */ 191 new_currdev.d_kind.biosdisk.slice = -1; 192 new_currdev.d_kind.biosdisk.partition = 0; 193 biosdev = -1; 194 } 195 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 196 /* The passed-in boot device is bad */ 197 new_currdev.d_kind.biosdisk.slice = -1; 198 new_currdev.d_kind.biosdisk.partition = 0; 199 biosdev = -1; 200 } else { 201 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 202 B_CONTROLLER(initial_bootdev) - 1; 203 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 204 biosdev = initial_bootinfo->bi_bios_dev; 205 major = B_TYPE(initial_bootdev); 206 207 /* 208 * If we are booted by an old bootstrap, we have to guess at the BIOS 209 * unit number. We will loose if there is more than one disk type 210 * and we are not booting from the lowest-numbered disk type 211 * (ie. SCSI when IDE also exists). 212 */ 213 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 214 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 215 } 216 new_currdev.d_type = new_currdev.d_dev->dv_type; 217 218 /* 219 * If we are booting off of a BIOS disk and we didn't succeed in determining 220 * which one we booted off of, just use disk0: as a reasonable default. 221 */ 222 if ((new_currdev.d_type == biosdisk.dv_type) && 223 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 224 printf("Can't work out which disk we are booting from.\n" 225 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 226 new_currdev.d_kind.biosdisk.unit = 0; 227 } 228 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 229 i386_setcurrdev, env_nounset); 230 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 231 env_nounset); 232} 233 234COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 235 236static int 237command_reboot(int argc, char *argv[]) 238{ 239 int i; 240 241 for (i = 0; devsw[i] != NULL; ++i) 242 if (devsw[i]->dv_cleanup != NULL) 243 (devsw[i]->dv_cleanup)(); 244 245 printf("Rebooting...\n"); 246 delay(1000000); 247 __exit(0); 248} 249 250/* provide this for panic, as it's not in the startup code */ 251void 252exit(int code) 253{ 254 __exit(code); 255} 256 257COMMAND_SET(heap, "heap", "show heap usage", command_heap); 258 259static int 260command_heap(int argc, char *argv[]) 261{ 262 mallocstats(); 263 printf("heap base at %p, top at %p\n", end, sbrk(0)); 264 return(CMD_OK); 265} 266 267/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 268static int 269isa_inb(int port) 270{ 271 u_char data; 272 273 if (__builtin_constant_p(port) && 274 (((port) & 0xffff) < 0x100) && 275 ((port) < 0x10000)) { 276 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 277 } else { 278 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 279 } 280 return(data); 281} 282 283static void 284isa_outb(int port, int value) 285{ 286 u_char al = value; 287 288 if (__builtin_constant_p(port) && 289 (((port) & 0xffff) < 0x100) && 290 ((port) < 0x10000)) { 291 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 292 } else { 293 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 294 } 295} 296 297