main.c revision 201339
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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/boot/pc98/loader/main.c 201339 2009-12-31 12:05:48Z nyan $"); 29 30/* 31 * MD bootstrap main() and assorted miscellaneous 32 * commands. 33 */ 34 35#include <stand.h> 36#include <string.h> 37#include <machine/bootinfo.h> 38#include <machine/psl.h> 39#include <sys/reboot.h> 40 41#include "bootstrap.h" 42#include "libi386/libi386.h" 43#include "libpc98/libpc98.h" 44#include "btxv86.h" 45 46#define KARGS_FLAGS_CD 0x1 47#define KARGS_FLAGS_PXE 0x2 48 49/* Arguments passed in from the boot1/boot2 loader */ 50static struct 51{ 52 u_int32_t howto; 53 u_int32_t bootdev; 54 u_int32_t bootflags; 55 u_int32_t pxeinfo; 56 u_int32_t res2; 57 u_int32_t bootinfo; 58} *kargs; 59 60static u_int32_t initial_howto; 61static u_int32_t initial_bootdev; 62static struct bootinfo *initial_bootinfo; 63 64struct arch_switch archsw; /* MI/MD interface boundary */ 65 66static void extract_currdev(void); 67static int isa_inb(int port); 68static void isa_outb(int port, int value); 69void exit(int code); 70 71/* from vers.c */ 72extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 73 74/* XXX debugging */ 75extern char end[]; 76 77static void *heap_top; 78static void *heap_bottom; 79 80int 81main(void) 82{ 83 int i; 84 85 /* Set machine type to PC98_SYSTEM_PARAMETER. */ 86 set_machine_type(); 87 88 /* Pick up arguments */ 89 kargs = (void *)__args; 90 initial_howto = kargs->howto; 91 initial_bootdev = kargs->bootdev; 92 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 93 94 /* Initialize the v86 register set to a known-good state. */ 95 bzero(&v86, sizeof(v86)); 96 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 97 98 /* 99 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 100 */ 101 bios_getmem(); 102 103#if defined(LOADER_BZIP2_SUPPORT) 104 if (high_heap_size > 0) { 105 heap_top = PTOV(high_heap_base + high_heap_size); 106 heap_bottom = PTOV(high_heap_base); 107 if (high_heap_base < memtop_copyin) 108 memtop_copyin = high_heap_base; 109 } else 110#endif 111 { 112 heap_top = (void *)PTOV(bios_basemem); 113 heap_bottom = (void *)end; 114 } 115 setheap(heap_bottom, heap_top); 116 117 /* 118 * XXX Chicken-and-egg problem; we want to have console output early, but some 119 * console attributes may depend on reading from eg. the boot device, which we 120 * can't do yet. 121 * 122 * We can use printf() etc. once this is done. 123 * If the previous boot stage has requested a serial console, prefer that. 124 */ 125 bi_setboothowto(initial_howto); 126 if (initial_howto & RB_MULTIPLE) { 127 if (initial_howto & RB_SERIAL) 128 setenv("console", "comconsole vidconsole", 1); 129 else 130 setenv("console", "vidconsole comconsole", 1); 131 } else if (initial_howto & RB_SERIAL) 132 setenv("console", "comconsole", 1); 133 else if (initial_howto & RB_MUTE) 134 setenv("console", "nullconsole", 1); 135 cons_probe(); 136 137 /* 138 * Initialise the block cache 139 */ 140 bcache_init(32, 512); /* 16k cache XXX tune this */ 141 142 /* 143 * Special handling for PXE and CD booting. 144 */ 145 if (kargs->bootinfo == 0) { 146 /* 147 * We only want the PXE disk to try to init itself in the below 148 * walk through devsw if we actually booted off of PXE. 149 */ 150 if (kargs->bootflags & KARGS_FLAGS_PXE) 151 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 152 else if (kargs->bootflags & KARGS_FLAGS_CD) 153 bc_add(initial_bootdev); 154 } 155 156 archsw.arch_autoload = i386_autoload; 157 archsw.arch_getdev = i386_getdev; 158 archsw.arch_copyin = i386_copyin; 159 archsw.arch_copyout = i386_copyout; 160 archsw.arch_readin = i386_readin; 161 archsw.arch_isainb = isa_inb; 162 archsw.arch_isaoutb = isa_outb; 163 164 /* 165 * March through the device switch probing for things. 166 */ 167 for (i = 0; devsw[i] != NULL; i++) 168 if (devsw[i]->dv_init != NULL) 169 (devsw[i]->dv_init)(); 170 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 171 if (initial_bootinfo != NULL) { 172 initial_bootinfo->bi_basemem = bios_basemem / 1024; 173 initial_bootinfo->bi_extmem = bios_extmem / 1024; 174 } 175 176 printf("\n"); 177 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 178 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 179 180 extract_currdev(); /* set $currdev and $loaddev */ 181 setenv("LINES", "24", 1); /* optional */ 182 183 interact(); /* doesn't return */ 184 185 /* if we ever get here, it is an error */ 186 return (1); 187} 188 189/* 190 * Set the 'current device' by (if possible) recovering the boot device as 191 * supplied by the initial bootstrap. 192 * 193 * XXX should be extended for netbooting. 194 */ 195static void 196extract_currdev(void) 197{ 198 struct i386_devdesc new_currdev; 199 int major; 200 int biosdev = -1; 201 202 /* Assume we are booting from a BIOS disk by default */ 203 new_currdev.d_dev = &biosdisk; 204 205 /* new-style boot loaders such as pxeldr and cdldr */ 206 if (kargs->bootinfo == 0) { 207 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 208 /* we are booting from a CD with cdboot */ 209 new_currdev.d_dev = &bioscd; 210 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 211 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 212 /* we are booting from pxeldr */ 213 new_currdev.d_dev = &pxedisk; 214 new_currdev.d_unit = 0; 215 } else { 216 /* we don't know what our boot device is */ 217 new_currdev.d_kind.biosdisk.slice = -1; 218 new_currdev.d_kind.biosdisk.partition = 0; 219 biosdev = -1; 220 } 221 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 222 /* The passed-in boot device is bad */ 223 new_currdev.d_kind.biosdisk.slice = -1; 224 new_currdev.d_kind.biosdisk.partition = 0; 225 biosdev = -1; 226 } else { 227 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 228 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 229 biosdev = initial_bootinfo->bi_bios_dev; 230 major = B_TYPE(initial_bootdev); 231 232 /* 233 * If we are booted by an old bootstrap, we have to guess at the BIOS 234 * unit number. We will lose if there is more than one disk type 235 * and we are not booting from the lowest-numbered disk type 236 * (ie. SCSI when IDE also exists). 237 */ 238 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 239 if (B_TYPE(initial_bootdev) == 6) 240 biosdev = 0x30 + B_UNIT(initial_bootdev); 241 else 242 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 243 } 244 } 245 new_currdev.d_type = new_currdev.d_dev->dv_type; 246 247 /* 248 * If we are booting off of a BIOS disk and we didn't succeed in determining 249 * which one we booted off of, just use disk0: as a reasonable default. 250 */ 251 if ((new_currdev.d_type == biosdisk.dv_type) && 252 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 253 printf("Can't work out which disk we are booting from.\n" 254 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 255 new_currdev.d_unit = 0; 256 } 257 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 258 i386_setcurrdev, env_nounset); 259 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 260 env_nounset); 261} 262 263COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 264 265static int 266command_reboot(int argc, char *argv[]) 267{ 268 int i; 269 270 for (i = 0; devsw[i] != NULL; ++i) 271 if (devsw[i]->dv_cleanup != NULL) 272 (devsw[i]->dv_cleanup)(); 273 274 printf("Rebooting...\n"); 275 delay(1000000); 276 __exit(0); 277} 278 279/* provide this for panic, as it's not in the startup code */ 280void 281exit(int code) 282{ 283 __exit(code); 284} 285 286COMMAND_SET(heap, "heap", "show heap usage", command_heap); 287 288static int 289command_heap(int argc, char *argv[]) 290{ 291 mallocstats(); 292 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 293 sbrk(0), heap_top); 294 return(CMD_OK); 295} 296 297/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 298static int 299isa_inb(int port) 300{ 301 u_char data; 302 303 if (__builtin_constant_p(port) && 304 (((port) & 0xffff) < 0x100) && 305 ((port) < 0x10000)) { 306 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 307 } else { 308 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 309 } 310 return(data); 311} 312 313static void 314isa_outb(int port, int value) 315{ 316 u_char al = value; 317 318 if (__builtin_constant_p(port) && 319 (((port) & 0xffff) < 0x100) && 320 ((port) < 0x10000)) { 321 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 322 } else { 323 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 324 } 325} 326 327