main.c revision 68358
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 * $FreeBSD: head/sys/boot/pc98/loader/main.c 68358 2000-11-05 12:35:41Z nyan $ 27 */ 28 29/* 30 * MD bootstrap main() and assorted miscellaneous 31 * commands. 32 */ 33 34#include <stand.h> 35#include <string.h> 36#include <machine/bootinfo.h> 37#include <sys/reboot.h> 38 39#include "bootstrap.h" 40#include "libi386/libi386.h" 41#include "btxv86.h" 42 43#define KARGS_FLAGS_CD 0x1 44#define KARGS_FLAGS_PXE 0x2 45 46/* Arguments passed in from the boot1/boot2 loader */ 47static struct 48{ 49 u_int32_t howto; 50 u_int32_t bootdev; 51 u_int32_t bootflags; 52 u_int32_t pxeinfo; 53 u_int32_t res2; 54 u_int32_t bootinfo; 55} *kargs; 56 57static u_int32_t initial_howto; 58static u_int32_t initial_bootdev; 59static struct bootinfo *initial_bootinfo; 60 61struct arch_switch archsw; /* MI/MD interface boundary */ 62 63static void extract_currdev(void); 64static int isa_inb(int port); 65static void isa_outb(int port, int value); 66void exit(int code); 67 68/* from vers.c */ 69extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 70 71/* XXX debugging */ 72extern char end[]; 73 74int 75main(void) 76{ 77 int i; 78 79 /* Pick up arguments */ 80 kargs = (void *)__args; 81 initial_howto = kargs->howto; 82 initial_bootdev = kargs->bootdev; 83 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 84 85 /* 86 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 87 */ 88 bios_getmem(); 89 90 setheap((void *)end, (void *)bios_basemem); 91 92 /* 93 * XXX Chicken-and-egg problem; we want to have console output early, but some 94 * console attributes may depend on reading from eg. the boot device, which we 95 * can't do yet. 96 * 97 * We can use printf() etc. once this is done. 98 * If the previous boot stage has requested a serial console, prefer that. 99 */ 100 if (initial_howto & RB_SERIAL) 101 setenv("console", "comconsole", 1); 102 if (initial_howto & RB_MUTE) 103 setenv("console", "nullconsole", 1); 104 cons_probe(); 105 106 /* 107 * Initialise the block cache 108 */ 109 bcache_init(32, 512); /* 16k cache XXX tune this */ 110 111 /* 112 * We only want the PXE disk to try to init itself in the below walk through 113 * devsw if we actually booted off of PXE. 114 */ 115 if((kargs->bootinfo == NULL) && 116 ((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) { 117 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 118 } 119 120 /* 121 * March through the device switch probing for things. 122 */ 123 for (i = 0; devsw[i] != NULL; i++) 124 if (devsw[i]->dv_init != NULL) 125 (devsw[i]->dv_init)(); 126 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 127 128 printf("\n"); 129 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 130 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 131 132 extract_currdev(); /* set $currdev and $loaddev */ 133 setenv("LINES", "24", 1); /* optional */ 134 135 archsw.arch_autoload = i386_autoload; 136 archsw.arch_getdev = i386_getdev; 137 archsw.arch_copyin = i386_copyin; 138 archsw.arch_copyout = i386_copyout; 139 archsw.arch_readin = i386_readin; 140 archsw.arch_isainb = isa_inb; 141 archsw.arch_isaoutb = isa_outb; 142 143 interact(); /* doesn't return */ 144 145 /* if we ever get here, it is an error */ 146 return (1); 147} 148 149/* 150 * Set the 'current device' by (if possible) recovering the boot device as 151 * supplied by the initial bootstrap. 152 * 153 * XXX should be extended for netbooting. 154 */ 155static void 156extract_currdev(void) 157{ 158 struct i386_devdesc new_currdev; 159 int major, biosdev; 160 161 /* Assume we are booting from a BIOS disk by default */ 162 new_currdev.d_dev = &biosdisk; 163 new_currdev.d_type = new_currdev.d_dev->dv_type; 164 165 /* new-style boot loaders such as pxeldr and cdldr */ 166 if (kargs->bootinfo == NULL) { 167 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 168 /* we are booting from a CD with cdldr */ 169 new_currdev.d_kind.biosdisk.slice = -1; 170 new_currdev.d_kind.biosdisk.partition = 0; 171 biosdev = initial_bootdev; 172 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 173 /* we are booting from pxeldr */ 174 new_currdev.d_dev = &pxedisk; 175 new_currdev.d_type = new_currdev.d_dev->dv_type; 176 new_currdev.d_kind.netif.unit = 0; 177 biosdev = -1; 178 } else { 179 /* we don't know what our boot device is */ 180 new_currdev.d_kind.biosdisk.slice = -1; 181 new_currdev.d_kind.biosdisk.partition = 0; 182 biosdev = -1; 183 } 184 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 185 /* The passed-in boot device is bad */ 186 new_currdev.d_kind.biosdisk.slice = -1; 187 new_currdev.d_kind.biosdisk.partition = 0; 188 biosdev = -1; 189 } else { 190 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 191 B_CONTROLLER(initial_bootdev) - 1; 192 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 193 biosdev = initial_bootinfo->bi_bios_dev; 194 major = B_TYPE(initial_bootdev); 195 196 /* 197 * If we are booted by an old bootstrap, we have to guess at the BIOS 198 * unit number. We will loose if there is more than one disk type 199 * and we are not booting from the lowest-numbered disk type 200 * (ie. SCSI when IDE also exists). 201 */ 202#ifdef PC98 203 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 204 if (B_TYPE(initial_bootdev) == 6) 205 biosdev = 0x30 + B_UNIT(initial_bootdev); 206 else 207 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 208 } 209#else 210 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 211 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 212#endif 213 } 214 215 /* 216 * If we are booting off of a BIOS disk and we didn't succeed in determining 217 * which one we booted off of, just use disk0: as a reasonable default. 218 */ 219 if ((new_currdev.d_type == devsw[0]->dv_type) && 220 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 221 printf("Can't work out which disk we are booting from.\n" 222 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 223 new_currdev.d_kind.biosdisk.unit = 0; 224 } 225 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 226 i386_setcurrdev, env_nounset); 227 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 228 env_nounset); 229} 230 231COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 232 233static int 234command_reboot(int argc, char *argv[]) 235{ 236 int i; 237 238 for (i = 0; devsw[i] != NULL; ++i) 239 if (devsw[i]->dv_cleanup != NULL) 240 (devsw[i]->dv_cleanup)(); 241 242 printf("Rebooting...\n"); 243 delay(1000000); 244 __exit(0); 245} 246 247/* provide this for panic, as it's not in the startup code */ 248void 249exit(int code) 250{ 251 __exit(code); 252} 253 254COMMAND_SET(heap, "heap", "show heap usage", command_heap); 255 256static int 257command_heap(int argc, char *argv[]) 258{ 259 mallocstats(); 260 printf("heap base at %p, top at %p\n", end, sbrk(0)); 261 return(CMD_OK); 262} 263 264/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 265static int 266isa_inb(int port) 267{ 268 u_char data; 269 270 if (__builtin_constant_p(port) && 271 (((port) & 0xffff) < 0x100) && 272 ((port) < 0x10000)) { 273 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 274 } else { 275 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 276 } 277 return(data); 278} 279 280static void 281isa_outb(int port, int value) 282{ 283 u_char al = value; 284 285 if (__builtin_constant_p(port) && 286 (((port) & 0xffff) < 0x100) && 287 ((port) < 0x10000)) { 288 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 289 } else { 290 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 291 } 292} 293 294