main.c revision 200253
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 200253 2009-12-08 12:10:06Z 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 <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 48/* Arguments passed in from the boot1/boot2 loader */ 49static struct 50{ 51 u_int32_t howto; 52 u_int32_t bootdev; 53 u_int32_t bootflags; 54 u_int32_t pxeinfo; 55 u_int32_t res2; 56 u_int32_t bootinfo; 57} *kargs; 58 59static u_int32_t initial_howto; 60static u_int32_t initial_bootdev; 61static struct bootinfo *initial_bootinfo; 62 63struct arch_switch archsw; /* MI/MD interface boundary */ 64 65static void extract_currdev(void); 66static int isa_inb(int port); 67static void isa_outb(int port, int value); 68void exit(int code); 69 70/* from vers.c */ 71extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 72 73/* XXX debugging */ 74extern char end[]; 75 76static void *heap_top; 77static void *heap_bottom; 78 79int 80main(void) 81{ 82 int i; 83 84 /* Pick up arguments */ 85 kargs = (void *)__args; 86 initial_howto = kargs->howto; 87 initial_bootdev = kargs->bootdev; 88 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 89 90 /* Initialize the v86 register set to a known-good state. */ 91 bzero(&v86, sizeof(v86)); 92 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 93 94 /* 95 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 96 */ 97 bios_getmem(); 98 99#if defined(LOADER_BZIP2_SUPPORT) 100 heap_top = PTOV(memtop_copyin); 101 memtop_copyin -= 0x300000; 102 heap_bottom = PTOV(memtop_copyin); 103#else 104 heap_top = (void *)bios_basemem; 105 heap_bottom = (void *)end; 106#endif 107 setheap(heap_bottom, heap_top); 108 109 /* 110 * XXX Chicken-and-egg problem; we want to have console output early, but some 111 * console attributes may depend on reading from eg. the boot device, which we 112 * can't do yet. 113 * 114 * We can use printf() etc. once this is done. 115 * If the previous boot stage has requested a serial console, prefer that. 116 */ 117 bi_setboothowto(initial_howto); 118 if (initial_howto & RB_MULTIPLE) { 119 if (initial_howto & RB_SERIAL) 120 setenv("console", "comconsole vidconsole", 1); 121 else 122 setenv("console", "vidconsole comconsole", 1); 123 } else if (initial_howto & RB_SERIAL) 124 setenv("console", "comconsole", 1); 125 else if (initial_howto & RB_MUTE) 126 setenv("console", "nullconsole", 1); 127 cons_probe(); 128 129 /* 130 * Initialise the block cache 131 */ 132 bcache_init(32, 512); /* 16k cache XXX tune this */ 133 134 /* 135 * Special handling for PXE and CD booting. 136 */ 137 if (kargs->bootinfo == 0) { 138 /* 139 * We only want the PXE disk to try to init itself in the below 140 * walk through devsw if we actually booted off of PXE. 141 */ 142 if (kargs->bootflags & KARGS_FLAGS_PXE) 143 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 144 else if (kargs->bootflags & KARGS_FLAGS_CD) 145 bc_add(initial_bootdev); 146 } 147 148 archsw.arch_autoload = i386_autoload; 149 archsw.arch_getdev = i386_getdev; 150 archsw.arch_copyin = i386_copyin; 151 archsw.arch_copyout = i386_copyout; 152 archsw.arch_readin = i386_readin; 153 archsw.arch_isainb = isa_inb; 154 archsw.arch_isaoutb = isa_outb; 155 156 /* 157 * March through the device switch probing for things. 158 */ 159 for (i = 0; devsw[i] != NULL; i++) 160 if (devsw[i]->dv_init != NULL) 161 (devsw[i]->dv_init)(); 162 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 163 if (initial_bootinfo != NULL) { 164 initial_bootinfo->bi_basemem = bios_basemem / 1024; 165 initial_bootinfo->bi_extmem = bios_extmem / 1024; 166 } 167 168 printf("\n"); 169 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 170 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 171 172 extract_currdev(); /* set $currdev and $loaddev */ 173 setenv("LINES", "24", 1); /* optional */ 174 175 interact(); /* doesn't return */ 176 177 /* if we ever get here, it is an error */ 178 return (1); 179} 180 181/* 182 * Set the 'current device' by (if possible) recovering the boot device as 183 * supplied by the initial bootstrap. 184 * 185 * XXX should be extended for netbooting. 186 */ 187static void 188extract_currdev(void) 189{ 190 struct i386_devdesc new_currdev; 191 int major; 192 int biosdev = -1; 193 194 /* Assume we are booting from a BIOS disk by default */ 195 new_currdev.d_dev = &biosdisk; 196 197 /* new-style boot loaders such as pxeldr and cdldr */ 198 if (kargs->bootinfo == 0) { 199 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 200 /* we are booting from a CD with cdboot */ 201 new_currdev.d_dev = &bioscd; 202 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 203 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 204 /* we are booting from pxeldr */ 205 new_currdev.d_dev = &pxedisk; 206 new_currdev.d_unit = 0; 207 } else { 208 /* we don't know what our boot device is */ 209 new_currdev.d_kind.biosdisk.slice = -1; 210 new_currdev.d_kind.biosdisk.partition = 0; 211 biosdev = -1; 212 } 213 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 214 /* The passed-in boot device is bad */ 215 new_currdev.d_kind.biosdisk.slice = -1; 216 new_currdev.d_kind.biosdisk.partition = 0; 217 biosdev = -1; 218 } else { 219 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 220 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 221 biosdev = initial_bootinfo->bi_bios_dev; 222 major = B_TYPE(initial_bootdev); 223 224 /* 225 * If we are booted by an old bootstrap, we have to guess at the BIOS 226 * unit number. We will lose if there is more than one disk type 227 * and we are not booting from the lowest-numbered disk type 228 * (ie. SCSI when IDE also exists). 229 */ 230 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 231 if (B_TYPE(initial_bootdev) == 6) 232 biosdev = 0x30 + B_UNIT(initial_bootdev); 233 else 234 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 235 } 236 } 237 new_currdev.d_type = new_currdev.d_dev->dv_type; 238 239 /* 240 * If we are booting off of a BIOS disk and we didn't succeed in determining 241 * which one we booted off of, just use disk0: as a reasonable default. 242 */ 243 if ((new_currdev.d_type == biosdisk.dv_type) && 244 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 245 printf("Can't work out which disk we are booting from.\n" 246 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 247 new_currdev.d_unit = 0; 248 } 249 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 250 i386_setcurrdev, env_nounset); 251 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 252 env_nounset); 253} 254 255COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 256 257static int 258command_reboot(int argc, char *argv[]) 259{ 260 int i; 261 262 for (i = 0; devsw[i] != NULL; ++i) 263 if (devsw[i]->dv_cleanup != NULL) 264 (devsw[i]->dv_cleanup)(); 265 266 printf("Rebooting...\n"); 267 delay(1000000); 268 __exit(0); 269} 270 271/* provide this for panic, as it's not in the startup code */ 272void 273exit(int code) 274{ 275 __exit(code); 276} 277 278COMMAND_SET(heap, "heap", "show heap usage", command_heap); 279 280static int 281command_heap(int argc, char *argv[]) 282{ 283 mallocstats(); 284 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 285 sbrk(0), heap_top); 286 return(CMD_OK); 287} 288 289/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 290static int 291isa_inb(int port) 292{ 293 u_char data; 294 295 if (__builtin_constant_p(port) && 296 (((port) & 0xffff) < 0x100) && 297 ((port) < 0x10000)) { 298 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 299 } else { 300 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 301 } 302 return(data); 303} 304 305static void 306isa_outb(int port, int value) 307{ 308 u_char al = value; 309 310 if (__builtin_constant_p(port) && 311 (((port) & 0xffff) < 0x100) && 312 ((port) < 0x10000)) { 313 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 314 } else { 315 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 316 } 317} 318 319