main.c revision 58871
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 58871 2000-03-31 16:03:02Z 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 73void 74main(void) 75{ 76 int i; 77 78 /* Pick up arguments */ 79 kargs = (void *)__args; 80 initial_howto = kargs->howto; 81 initial_bootdev = kargs->bootdev; 82 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 83 84 /* 85 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 86 */ 87 bios_getmem(); 88 setheap((void *)end, (void *)bios_basemem); 89 90 /* 91 * XXX Chicken-and-egg problem; we want to have console output early, but some 92 * console attributes may depend on reading from eg. the boot device, which we 93 * can't do yet. 94 * 95 * We can use printf() etc. once this is done. 96 * If the previous boot stage has requested a serial console, prefer that. 97 */ 98 if (initial_howto & RB_SERIAL) 99 setenv("console", "comconsole", 1); 100 cons_probe(); 101 102 /* 103 * Initialise the block cache 104 */ 105 bcache_init(32, 512); /* 16k cache XXX tune this */ 106 107 /* 108 * We only want the PXE disk to try to init itself in the below walk through 109 * devsw if we actually booted off of PXE. 110 */ 111 if((kargs->bootinfo == NULL) && 112 ((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) { 113 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 114 } 115 116 /* 117 * March through the device switch probing for things. 118 */ 119 for (i = 0; devsw[i] != NULL; i++) 120 if (devsw[i]->dv_init != NULL) 121 (devsw[i]->dv_init)(); 122 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 123 124 printf("\n"); 125 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 126 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 127 128 extract_currdev(); /* set $currdev and $loaddev */ 129 setenv("LINES", "24", 1); /* optional */ 130 131 archsw.arch_autoload = i386_autoload; 132 archsw.arch_getdev = i386_getdev; 133 archsw.arch_copyin = i386_copyin; 134 archsw.arch_copyout = i386_copyout; 135 archsw.arch_readin = i386_readin; 136 archsw.arch_isainb = isa_inb; 137 archsw.arch_isaoutb = isa_outb; 138 139 interact(); /* doesn't return */ 140} 141 142/* 143 * Set the 'current device' by (if possible) recovering the boot device as 144 * supplied by the initial bootstrap. 145 * 146 * XXX should be extended for netbooting. 147 */ 148static void 149extract_currdev(void) 150{ 151 struct i386_devdesc currdev; 152 int major, biosdev; 153 154 /* Assume we are booting from a BIOS disk by default */ 155 currdev.d_dev = &biosdisk; 156 currdev.d_type = currdev.d_dev->dv_type; 157 158 /* new-style boot loaders such as pxeldr and cdldr */ 159 if (kargs->bootinfo == NULL) { 160 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 161 /* we are booting from a CD with cdldr */ 162 currdev.d_kind.biosdisk.slice = -1; 163 currdev.d_kind.biosdisk.partition = 0; 164 biosdev = initial_bootdev; 165 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 166 /* we are booting from pxeldr */ 167 currdev.d_dev = &pxedisk; 168 currdev.d_type = currdev.d_dev->dv_type; 169 currdev.d_kind.netif.unit = 0; 170 } else { 171 /* we don't know what our boot device is */ 172 currdev.d_kind.biosdisk.slice = -1; 173 currdev.d_kind.biosdisk.partition = 0; 174 biosdev = -1; 175 } 176 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 177 /* The passed-in boot device is bad */ 178 currdev.d_kind.biosdisk.slice = -1; 179 currdev.d_kind.biosdisk.partition = 0; 180 biosdev = -1; 181 } else { 182 currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 183 B_CONTROLLER(initial_bootdev) - 1; 184 currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 185 biosdev = initial_bootinfo->bi_bios_dev; 186 major = B_TYPE(initial_bootdev); 187 188 /* 189 * If we are booted by an old bootstrap, we have to guess at the BIOS 190 * unit number. We will loose if there is more than one disk type 191 * and we are not booting from the lowest-numbered disk type 192 * (ie. SCSI when IDE also exists). 193 */ 194#ifdef PC98 195 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 196 if (B_TYPE(initial_bootdev) == 6) 197 biosdev = 0x30 + B_UNIT(initial_bootdev); 198 else 199 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 200 } 201#else 202 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 203 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 204#endif 205 } 206 207 /* 208 * If we are booting off of a BIOS disk and we didn't succeed in determining 209 * which one we booted off of, just use disk0: as a reasonable default. 210 */ 211 if ((currdev.d_type == devsw[0]->dv_type) && 212 ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 213 printf("Can't work out which disk we are booting from.\n" 214 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 215 currdev.d_kind.biosdisk.unit = 0; 216 } 217 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset); 218 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset); 219} 220 221COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 222 223static int 224command_reboot(int argc, char *argv[]) 225{ 226 227 printf("Rebooting...\n"); 228 delay(1000000); 229 __exit(0); 230} 231 232/* provide this for panic, as it's not in the startup code */ 233void 234exit(int code) 235{ 236 __exit(code); 237} 238 239COMMAND_SET(heap, "heap", "show heap usage", command_heap); 240 241static int 242command_heap(int argc, char *argv[]) 243{ 244 mallocstats(); 245 printf("heap base at %p, top at %p\n", end, sbrk(0)); 246 return(CMD_OK); 247} 248 249/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 250static int 251isa_inb(int port) 252{ 253 u_char data; 254 255 if (__builtin_constant_p(port) && 256 (((port) & 0xffff) < 0x100) && 257 ((port) < 0x10000)) { 258 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 259 } else { 260 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 261 } 262 return(data); 263} 264 265static void 266isa_outb(int port, int value) 267{ 268 u_char al = value; 269 270 if (__builtin_constant_p(port) && 271 (((port) & 0xffff) < 0x100) && 272 ((port) < 0x10000)) { 273 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 274 } else { 275 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 276 } 277} 278 279