main.c revision 66246
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 66246 2000-09-22 12:51:22Z kato $ 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); 66 67/* from vers.c */ 68extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 69 70/* XXX debugging */ 71extern char end[]; 72 73/* XXX - I dont know why we have to do this, but it helps. */ 74#if defined(LOADER_NFS_SUPPORT) || defined(LOADER_TFTP_SUPPORT) 75char Heap[200*1024]; 76#endif 77 78void 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 /* XXX - I dont know why we have to do this, but it helps PXE. */ 95#if defined(LOADER_NFS_SUPPORT) || defined(LOADER_TFTP_SUPPORT) 96 setheap(Heap, Heap+sizeof(Heap)); 97#else 98 setheap((void *)end, (void *)bios_basemem); 99#endif 100 101 /* 102 * XXX Chicken-and-egg problem; we want to have console output early, but some 103 * console attributes may depend on reading from eg. the boot device, which we 104 * can't do yet. 105 * 106 * We can use printf() etc. once this is done. 107 * If the previous boot stage has requested a serial console, prefer that. 108 */ 109 if (initial_howto & RB_SERIAL) 110 setenv("console", "comconsole", 1); 111 if (initial_howto & RB_MUTE) 112 setenv("console", "nullconsole", 1); 113 cons_probe(); 114 115 /* 116 * Initialise the block cache 117 */ 118 bcache_init(32, 512); /* 16k cache XXX tune this */ 119 120 /* 121 * We only want the PXE disk to try to init itself in the below walk through 122 * devsw if we actually booted off of PXE. 123 */ 124 if((kargs->bootinfo == NULL) && 125 ((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) { 126 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 127 } 128 129 /* 130 * March through the device switch probing for things. 131 */ 132 for (i = 0; devsw[i] != NULL; i++) 133 if (devsw[i]->dv_init != NULL) 134 (devsw[i]->dv_init)(); 135 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 136 137 printf("\n"); 138 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 139 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 140 141 extract_currdev(); /* set $currdev and $loaddev */ 142 setenv("LINES", "24", 1); /* optional */ 143 144 archsw.arch_autoload = i386_autoload; 145 archsw.arch_getdev = i386_getdev; 146 archsw.arch_copyin = i386_copyin; 147 archsw.arch_copyout = i386_copyout; 148 archsw.arch_readin = i386_readin; 149 archsw.arch_isainb = isa_inb; 150 archsw.arch_isaoutb = isa_outb; 151 152 interact(); /* doesn't return */ 153} 154 155/* 156 * Set the 'current device' by (if possible) recovering the boot device as 157 * supplied by the initial bootstrap. 158 * 159 * XXX should be extended for netbooting. 160 */ 161static void 162extract_currdev(void) 163{ 164 struct i386_devdesc currdev; 165 int major, biosdev; 166 167 /* Assume we are booting from a BIOS disk by default */ 168 currdev.d_dev = &biosdisk; 169 currdev.d_type = currdev.d_dev->dv_type; 170 171 /* new-style boot loaders such as pxeldr and cdldr */ 172 if (kargs->bootinfo == NULL) { 173 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 174 /* we are booting from a CD with cdldr */ 175 currdev.d_kind.biosdisk.slice = -1; 176 currdev.d_kind.biosdisk.partition = 0; 177 biosdev = initial_bootdev; 178 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 179 /* we are booting from pxeldr */ 180 currdev.d_dev = &pxedisk; 181 currdev.d_type = currdev.d_dev->dv_type; 182 currdev.d_kind.netif.unit = 0; 183 } else { 184 /* we don't know what our boot device is */ 185 currdev.d_kind.biosdisk.slice = -1; 186 currdev.d_kind.biosdisk.partition = 0; 187 biosdev = -1; 188 } 189 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 190 /* The passed-in boot device is bad */ 191 currdev.d_kind.biosdisk.slice = -1; 192 currdev.d_kind.biosdisk.partition = 0; 193 biosdev = -1; 194 } else { 195 currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 196 B_CONTROLLER(initial_bootdev) - 1; 197 currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 198 biosdev = initial_bootinfo->bi_bios_dev; 199 major = B_TYPE(initial_bootdev); 200 201 /* 202 * If we are booted by an old bootstrap, we have to guess at the BIOS 203 * unit number. We will loose if there is more than one disk type 204 * and we are not booting from the lowest-numbered disk type 205 * (ie. SCSI when IDE also exists). 206 */ 207#ifdef PC98 208 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 209 if (B_TYPE(initial_bootdev) == 6) 210 biosdev = 0x30 + B_UNIT(initial_bootdev); 211 else 212 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 213 } 214#else 215 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 216 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 217#endif 218 } 219 220 /* 221 * If we are booting off of a BIOS disk and we didn't succeed in determining 222 * which one we booted off of, just use disk0: as a reasonable default. 223 */ 224 if ((currdev.d_type == devsw[0]->dv_type) && 225 ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 226 printf("Can't work out which disk we are booting from.\n" 227 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 228 currdev.d_kind.biosdisk.unit = 0; 229 } 230 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset); 231 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, 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