main.c revision 59167
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 59167 2000-04-12 11:17:08Z 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 cons_probe(); 112 113 /* 114 * Initialise the block cache 115 */ 116 bcache_init(32, 512); /* 16k cache XXX tune this */ 117 118 /* 119 * We only want the PXE disk to try to init itself in the below walk through 120 * devsw if we actually booted off of PXE. 121 */ 122 if((kargs->bootinfo == NULL) && 123 ((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) { 124 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 125 } 126 127 /* 128 * March through the device switch probing for things. 129 */ 130 for (i = 0; devsw[i] != NULL; i++) 131 if (devsw[i]->dv_init != NULL) 132 (devsw[i]->dv_init)(); 133 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 134 135 printf("\n"); 136 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 137 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 138 139 extract_currdev(); /* set $currdev and $loaddev */ 140 setenv("LINES", "24", 1); /* optional */ 141 142 archsw.arch_autoload = i386_autoload; 143 archsw.arch_getdev = i386_getdev; 144 archsw.arch_copyin = i386_copyin; 145 archsw.arch_copyout = i386_copyout; 146 archsw.arch_readin = i386_readin; 147 archsw.arch_isainb = isa_inb; 148 archsw.arch_isaoutb = isa_outb; 149 150 interact(); /* doesn't return */ 151} 152 153/* 154 * Set the 'current device' by (if possible) recovering the boot device as 155 * supplied by the initial bootstrap. 156 * 157 * XXX should be extended for netbooting. 158 */ 159static void 160extract_currdev(void) 161{ 162 struct i386_devdesc currdev; 163 int major, biosdev; 164 165 /* Assume we are booting from a BIOS disk by default */ 166 currdev.d_dev = &biosdisk; 167 currdev.d_type = currdev.d_dev->dv_type; 168 169 /* new-style boot loaders such as pxeldr and cdldr */ 170 if (kargs->bootinfo == NULL) { 171 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 172 /* we are booting from a CD with cdldr */ 173 currdev.d_kind.biosdisk.slice = -1; 174 currdev.d_kind.biosdisk.partition = 0; 175 biosdev = initial_bootdev; 176 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 177 /* we are booting from pxeldr */ 178 currdev.d_dev = &pxedisk; 179 currdev.d_type = currdev.d_dev->dv_type; 180 currdev.d_kind.netif.unit = 0; 181 } else { 182 /* we don't know what our boot device is */ 183 currdev.d_kind.biosdisk.slice = -1; 184 currdev.d_kind.biosdisk.partition = 0; 185 biosdev = -1; 186 } 187 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 188 /* The passed-in boot device is bad */ 189 currdev.d_kind.biosdisk.slice = -1; 190 currdev.d_kind.biosdisk.partition = 0; 191 biosdev = -1; 192 } else { 193 currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 194 B_CONTROLLER(initial_bootdev) - 1; 195 currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 196 biosdev = initial_bootinfo->bi_bios_dev; 197 major = B_TYPE(initial_bootdev); 198 199 /* 200 * If we are booted by an old bootstrap, we have to guess at the BIOS 201 * unit number. We will loose if there is more than one disk type 202 * and we are not booting from the lowest-numbered disk type 203 * (ie. SCSI when IDE also exists). 204 */ 205#ifdef PC98 206 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 207 if (B_TYPE(initial_bootdev) == 6) 208 biosdev = 0x30 + B_UNIT(initial_bootdev); 209 else 210 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 211 } 212#else 213 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 214 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 215#endif 216 } 217 218 /* 219 * If we are booting off of a BIOS disk and we didn't succeed in determining 220 * which one we booted off of, just use disk0: as a reasonable default. 221 */ 222 if ((currdev.d_type == devsw[0]->dv_type) && 223 ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 224 printf("Can't work out which disk we are booting from.\n" 225 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 226 currdev.d_kind.biosdisk.unit = 0; 227 } 228 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset); 229 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset); 230} 231 232COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 233 234static int 235command_reboot(int argc, char *argv[]) 236{ 237 238 printf("Rebooting...\n"); 239 delay(1000000); 240 __exit(0); 241} 242 243/* provide this for panic, as it's not in the startup code */ 244void 245exit(int code) 246{ 247 __exit(code); 248} 249 250COMMAND_SET(heap, "heap", "show heap usage", command_heap); 251 252static int 253command_heap(int argc, char *argv[]) 254{ 255 mallocstats(); 256 printf("heap base at %p, top at %p\n", end, sbrk(0)); 257 return(CMD_OK); 258} 259 260/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 261static int 262isa_inb(int port) 263{ 264 u_char data; 265 266 if (__builtin_constant_p(port) && 267 (((port) & 0xffff) < 0x100) && 268 ((port) < 0x10000)) { 269 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 270 } else { 271 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 272 } 273 return(data); 274} 275 276static void 277isa_outb(int port, int value) 278{ 279 u_char al = value; 280 281 if (__builtin_constant_p(port) && 282 (((port) & 0xffff) < 0x100) && 283 ((port) < 0x10000)) { 284 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 285 } else { 286 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 287 } 288} 289 290