main.c revision 50477
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 50477 1999-08-28 01:08:13Z peter $ 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/* Arguments passed in from the boot1/boot2 loader */ 44static struct 45{ 46 u_int32_t howto; 47 u_int32_t bootdev; 48 u_int32_t res0; 49 u_int32_t res1; 50 u_int32_t res2; 51 u_int32_t bootinfo; 52} *kargs; 53 54static u_int32_t initial_howto; 55static u_int32_t initial_bootdev; 56#ifdef PC98 57struct bootinfo *initial_bootinfo; 58#else 59static struct bootinfo *initial_bootinfo; 60#endif 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); 67 68/* from vers.c */ 69extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 70 71/* XXX debugging */ 72extern char end[]; 73 74void 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 = (struct bootinfo *)PTOV(kargs->bootinfo); 84 85 /* 86 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 87 * 88 * XXX better to locate end of memory and use that 89 */ 90 setheap((void *)end, (void *)(end + (384 * 1024))); 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 cons_probe(); 103 104 /* 105 * Initialise the block cache 106 */ 107 bcache_init(32, 512); /* 16k cache XXX tune this */ 108 109 /* 110 * March through the device switch probing for things. 111 */ 112 for (i = 0; devsw[i] != NULL; i++) 113 if (devsw[i]->dv_init != NULL) 114 (devsw[i]->dv_init)(); 115 116 printf("\n"); 117 printf("%s, Revision %s %d/%dkB\n", bootprog_name, bootprog_rev, getbasemem(), getextmem()); 118 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 119 120 extract_currdev(); /* set $currdev and $loaddev */ 121 setenv("LINES", "24", 1); /* optional */ 122 123 archsw.arch_autoload = i386_autoload; 124 archsw.arch_getdev = i386_getdev; 125 archsw.arch_copyin = i386_copyin; 126 archsw.arch_copyout = i386_copyout; 127 archsw.arch_readin = i386_readin; 128 archsw.arch_isainb = isa_inb; 129 archsw.arch_isaoutb = isa_outb; 130 131 interact(); /* doesn't return */ 132} 133 134/* 135 * Set the 'current device' by (if possible) recovering the boot device as 136 * supplied by the initial bootstrap. 137 * 138 * XXX should be extended for netbooting. 139 */ 140static void 141extract_currdev(void) 142{ 143 struct i386_devdesc currdev; 144 int major, biosdev; 145 146 /* We're booting from a BIOS disk, try to spiff this */ 147 currdev.d_dev = devsw[0]; /* XXX presumes that biosdisk is first in devsw */ 148 currdev.d_type = currdev.d_dev->dv_type; 149 150 if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 151 /* The passed-in boot device is bad */ 152 currdev.d_kind.biosdisk.slice = -1; 153 currdev.d_kind.biosdisk.partition = 0; 154 biosdev = -1; 155 } else { 156 currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + B_CONTROLLER(initial_bootdev) - 1; 157 currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 158 biosdev = initial_bootinfo->bi_bios_dev; 159 major = B_TYPE(initial_bootdev); 160 161 /* 162 * If we are booted by an old bootstrap, we have to guess at the BIOS 163 * unit number. We will loose if there is more than one disk type 164 * and we are not booting from the lowest-numbered disk type 165 * (ie. SCSI when IDE also exists). 166 */ 167#ifdef PC98 168 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 169 if (B_TYPE(initial_bootdev) == 6) 170 biosdev = 0x30 + B_UNIT(initial_bootdev); 171 else 172 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 173#else 174 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 175 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 176#endif 177 } 178 179 if ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1) { 180 printf("Can't work out which disk we are booting from.\n" 181 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 182 currdev.d_kind.biosdisk.unit = 0; 183 } 184 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset); 185 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset); 186} 187 188COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 189 190static int 191command_reboot(int argc, char *argv[]) 192{ 193 194 printf("Rebooting...\n"); 195 delay(1000000); 196 __exit(0); 197} 198 199/* provide this for panic, as it's not in the startup code */ 200void 201exit(int code) 202{ 203 __exit(code); 204} 205 206COMMAND_SET(heap, "heap", "show heap usage", command_heap); 207 208static int 209command_heap(int argc, char *argv[]) 210{ 211 mallocstats(); 212 printf("heap base at %p, top at %p\n", end, sbrk(0)); 213 return(CMD_OK); 214} 215 216/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 217static int 218isa_inb(int port) 219{ 220 u_char data; 221 222 if (__builtin_constant_p(port) && 223 (((port) & 0xffff) < 0x100) && 224 ((port) < 0x10000)) { 225 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 226 } else { 227 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 228 } 229 return(data); 230} 231 232static void 233isa_outb(int port, int value) 234{ 235 u_char al = value; 236 237 if (__builtin_constant_p(port) && 238 (((port) & 0xffff) < 0x100) && 239 ((port) < 0x10000)) { 240 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 241 } else { 242 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 243 } 244} 245 246