main.c revision 153600
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/pc98/loader/main.c 153600 2005-12-21 06:10:42Z nyan $"); 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 75static void *heap_top; 76static void *heap_bottom; 77 78int 79main(void) 80{ 81 int i; 82 83 /* Pick up arguments */ 84 kargs = (void *)__args; 85 initial_howto = kargs->howto; 86 initial_bootdev = kargs->bootdev; 87 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 88 89 /* 90 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 91 */ 92 bios_getmem(); 93 94#ifdef LOADER_BZIP2_SUPPORT 95 heap_top = PTOV(memtop_copyin); 96 memtop_copyin -= 0x300000; 97 heap_bottom = PTOV(memtop_copyin); 98#else 99 heap_top = (void *)bios_basemem; 100 heap_bottom = (void *)end; 101#endif 102 setheap(heap_bottom, heap_top); 103 104 /* 105 * XXX Chicken-and-egg problem; we want to have console output early, but some 106 * console attributes may depend on reading from eg. the boot device, which we 107 * can't do yet. 108 * 109 * We can use printf() etc. once this is done. 110 * If the previous boot stage has requested a serial console, prefer that. 111 */ 112 bi_setboothowto(initial_howto); 113 if (initial_howto & RB_MULTIPLE) { 114 if (initial_howto & RB_SERIAL) 115 setenv("console", "comconsole vidconsole", 1); 116 else 117 setenv("console", "vidconsole comconsole", 1); 118 } else if (initial_howto & RB_SERIAL) 119 setenv("console", "comconsole", 1); 120 else if (initial_howto & RB_MUTE) 121 setenv("console", "nullconsole", 1); 122 cons_probe(); 123 124 /* 125 * Initialise the block cache 126 */ 127 bcache_init(32, 512); /* 16k cache XXX tune this */ 128 129 /* 130 * Special handling for PXE and CD booting. 131 */ 132 if (kargs->bootinfo == 0) { 133 /* 134 * We only want the PXE disk to try to init itself in the below 135 * walk through devsw if we actually booted off of PXE. 136 */ 137 if (kargs->bootflags & KARGS_FLAGS_PXE) 138 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 139 else if (kargs->bootflags & KARGS_FLAGS_CD) 140 bc_add(initial_bootdev); 141 } 142 143 /* 144 * March through the device switch probing for things. 145 */ 146 for (i = 0; devsw[i] != NULL; i++) 147 if (devsw[i]->dv_init != NULL) 148 (devsw[i]->dv_init)(); 149 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 150 if (initial_bootinfo != NULL) { 151 initial_bootinfo->bi_basemem = bios_basemem / 1024; 152 initial_bootinfo->bi_extmem = bios_extmem / 1024; 153 } 154 155 printf("\n"); 156 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 157 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 158 159 extract_currdev(); /* set $currdev and $loaddev */ 160 setenv("LINES", "24", 1); /* optional */ 161 162 archsw.arch_autoload = i386_autoload; 163 archsw.arch_getdev = i386_getdev; 164 archsw.arch_copyin = i386_copyin; 165 archsw.arch_copyout = i386_copyout; 166 archsw.arch_readin = i386_readin; 167 archsw.arch_isainb = isa_inb; 168 archsw.arch_isaoutb = isa_outb; 169 170 interact(); /* doesn't return */ 171 172 /* if we ever get here, it is an error */ 173 return (1); 174} 175 176/* 177 * Set the 'current device' by (if possible) recovering the boot device as 178 * supplied by the initial bootstrap. 179 * 180 * XXX should be extended for netbooting. 181 */ 182static void 183extract_currdev(void) 184{ 185 struct i386_devdesc new_currdev; 186 int major, biosdev = -1; 187 188 /* Assume we are booting from a BIOS disk by default */ 189 new_currdev.d_dev = &biosdisk; 190 191 /* new-style boot loaders such as pxeldr and cdldr */ 192 if (kargs->bootinfo == 0) { 193 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 194 /* we are booting from a CD with cdboot */ 195 new_currdev.d_dev = &bioscd; 196 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev); 197 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 198 /* we are booting from pxeldr */ 199 new_currdev.d_dev = &pxedisk; 200 new_currdev.d_kind.netif.unit = 0; 201 } else { 202 /* we don't know what our boot device is */ 203 new_currdev.d_kind.biosdisk.slice = -1; 204 new_currdev.d_kind.biosdisk.partition = 0; 205 biosdev = -1; 206 } 207 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 208 /* The passed-in boot device is bad */ 209 new_currdev.d_kind.biosdisk.slice = -1; 210 new_currdev.d_kind.biosdisk.partition = 0; 211 biosdev = -1; 212 } else { 213 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 214 B_CONTROLLER(initial_bootdev) - 1; 215 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 216 biosdev = initial_bootinfo->bi_bios_dev; 217 major = B_TYPE(initial_bootdev); 218 219 /* 220 * If we are booted by an old bootstrap, we have to guess at the BIOS 221 * unit number. We will loose if there is more than one disk type 222 * and we are not booting from the lowest-numbered disk type 223 * (ie. SCSI when IDE also exists). 224 */ 225 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 226 if (B_TYPE(initial_bootdev) == 6) 227 biosdev = 0x30 + B_UNIT(initial_bootdev); 228 else 229 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 230 } 231 } 232 new_currdev.d_type = new_currdev.d_dev->dv_type; 233 234 /* 235 * If we are booting off of a BIOS disk and we didn't succeed in determining 236 * which one we booted off of, just use disk0: as a reasonable default. 237 */ 238 if ((new_currdev.d_type == biosdisk.dv_type) && 239 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 240 printf("Can't work out which disk we are booting from.\n" 241 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 242 new_currdev.d_kind.biosdisk.unit = 0; 243 } 244 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 245 i386_setcurrdev, env_nounset); 246 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 247 env_nounset); 248} 249 250COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 251 252static int 253command_reboot(int argc, char *argv[]) 254{ 255 int i; 256 257 for (i = 0; devsw[i] != NULL; ++i) 258 if (devsw[i]->dv_cleanup != NULL) 259 (devsw[i]->dv_cleanup)(); 260 261 printf("Rebooting...\n"); 262 delay(1000000); 263 __exit(0); 264} 265 266/* provide this for panic, as it's not in the startup code */ 267void 268exit(int code) 269{ 270 __exit(code); 271} 272 273COMMAND_SET(heap, "heap", "show heap usage", command_heap); 274 275static int 276command_heap(int argc, char *argv[]) 277{ 278 mallocstats(); 279 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 280 sbrk(0), heap_top); 281 return(CMD_OK); 282} 283 284/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 285static int 286isa_inb(int port) 287{ 288 u_char data; 289 290 if (__builtin_constant_p(port) && 291 (((port) & 0xffff) < 0x100) && 292 ((port) < 0x10000)) { 293 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 294 } else { 295 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 296 } 297 return(data); 298} 299 300static void 301isa_outb(int port, int value) 302{ 303 u_char al = value; 304 305 if (__builtin_constant_p(port) && 306 (((port) & 0xffff) < 0x100) && 307 ((port) < 0x10000)) { 308 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 309 } else { 310 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 311 } 312} 313 314