main.c revision 235264
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 235264 2012-05-11 09:46:17Z avg $"); 29 30/* 31 * MD bootstrap main() and assorted miscellaneous 32 * commands. 33 */ 34 35#include <stand.h> 36#include <stddef.h> 37#include <string.h> 38#include <machine/bootinfo.h> 39#include <sys/param.h> 40#include <sys/reboot.h> 41 42#include "bootstrap.h" 43#include "common/bootargs.h" 44#include "libi386/libi386.h" 45#include "libpc98/libpc98.h" 46#include "btxv86.h" 47 48CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE); 49CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO); 50CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS); 51CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE); 52 53/* Arguments passed in from the boot1/boot2 loader */ 54static struct bootargs *kargs; 55 56static u_int32_t initial_howto; 57static u_int32_t initial_bootdev; 58static struct bootinfo *initial_bootinfo; 59 60struct arch_switch archsw; /* MI/MD interface boundary */ 61 62static void extract_currdev(void); 63static int isa_inb(int port); 64static void isa_outb(int port, int value); 65void exit(int code); 66 67/* from vers.c */ 68extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 69 70/* XXX debugging */ 71extern char end[]; 72 73static void *heap_top; 74static void *heap_bottom; 75 76static uint64_t 77pc98_loadaddr(u_int type, void *data, uint64_t addr) 78{ 79 struct stat st; 80 81 if (type == LOAD_ELF) 82 return (roundup(addr, PAGE_SIZE)); 83 84 /* We cannot use 15M-16M area on pc98. */ 85 if (type == LOAD_RAW && addr < 0x1000000 && stat(data, &st) == 0 && 86 (st.st_size == -1 || addr + st.st_size > 0xf00000)) 87 addr = 0x1000000; 88 return (addr); 89} 90 91int 92main(void) 93{ 94 int i; 95 96 /* Set machine type to PC98_SYSTEM_PARAMETER. */ 97 set_machine_type(); 98 99 /* Pick up arguments */ 100 kargs = (void *)__args; 101 initial_howto = kargs->howto; 102 initial_bootdev = kargs->bootdev; 103 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 104 105 /* Initialize the v86 register set to a known-good state. */ 106 bzero(&v86, sizeof(v86)); 107 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 108 109 /* 110 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 111 */ 112 bios_getmem(); 113 114#if defined(LOADER_BZIP2_SUPPORT) 115 if (high_heap_size > 0) { 116 heap_top = PTOV(high_heap_base + high_heap_size); 117 heap_bottom = PTOV(high_heap_base); 118 if (high_heap_base < memtop_copyin) 119 memtop_copyin = high_heap_base; 120 } else 121#endif 122 { 123 heap_top = (void *)PTOV(bios_basemem); 124 heap_bottom = (void *)end; 125 } 126 setheap(heap_bottom, heap_top); 127 128 /* 129 * XXX Chicken-and-egg problem; we want to have console output early, but some 130 * console attributes may depend on reading from eg. the boot device, which we 131 * can't do yet. 132 * 133 * We can use printf() etc. once this is done. 134 * If the previous boot stage has requested a serial console, prefer that. 135 */ 136 bi_setboothowto(initial_howto); 137 if (initial_howto & RB_MULTIPLE) { 138 if (initial_howto & RB_SERIAL) 139 setenv("console", "comconsole vidconsole", 1); 140 else 141 setenv("console", "vidconsole comconsole", 1); 142 } else if (initial_howto & RB_SERIAL) 143 setenv("console", "comconsole", 1); 144 else if (initial_howto & RB_MUTE) 145 setenv("console", "nullconsole", 1); 146 cons_probe(); 147 148 /* 149 * Initialise the block cache 150 */ 151 bcache_init(32, 512); /* 16k cache XXX tune this */ 152 153 /* 154 * Special handling for PXE and CD booting. 155 */ 156 if (kargs->bootinfo == 0) { 157 /* 158 * We only want the PXE disk to try to init itself in the below 159 * walk through devsw if we actually booted off of PXE. 160 */ 161 if (kargs->bootflags & KARGS_FLAGS_PXE) 162 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 163 else if (kargs->bootflags & KARGS_FLAGS_CD) 164 bc_add(initial_bootdev); 165 } 166 167 archsw.arch_autoload = i386_autoload; 168 archsw.arch_getdev = i386_getdev; 169 archsw.arch_copyin = i386_copyin; 170 archsw.arch_copyout = i386_copyout; 171 archsw.arch_readin = i386_readin; 172 archsw.arch_isainb = isa_inb; 173 archsw.arch_isaoutb = isa_outb; 174 archsw.arch_loadaddr = pc98_loadaddr; 175 176 /* 177 * March through the device switch probing for things. 178 */ 179 for (i = 0; devsw[i] != NULL; i++) 180 if (devsw[i]->dv_init != NULL) 181 (devsw[i]->dv_init)(); 182 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 183 if (initial_bootinfo != NULL) { 184 initial_bootinfo->bi_basemem = bios_basemem / 1024; 185 initial_bootinfo->bi_extmem = bios_extmem / 1024; 186 } 187 188 printf("\n"); 189 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 190 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 191 192 extract_currdev(); /* set $currdev and $loaddev */ 193 setenv("LINES", "24", 1); /* optional */ 194 195 interact(); /* doesn't return */ 196 197 /* if we ever get here, it is an error */ 198 return (1); 199} 200 201/* 202 * Set the 'current device' by (if possible) recovering the boot device as 203 * supplied by the initial bootstrap. 204 * 205 * XXX should be extended for netbooting. 206 */ 207static void 208extract_currdev(void) 209{ 210 struct i386_devdesc new_currdev; 211 int major; 212 int biosdev = -1; 213 214 /* Assume we are booting from a BIOS disk by default */ 215 new_currdev.d_dev = &biosdisk; 216 217 /* new-style boot loaders such as pxeldr and cdldr */ 218 if (kargs->bootinfo == 0) { 219 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 220 /* we are booting from a CD with cdboot */ 221 new_currdev.d_dev = &bioscd; 222 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 223 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 224 /* we are booting from pxeldr */ 225 new_currdev.d_dev = &pxedisk; 226 new_currdev.d_unit = 0; 227 } else { 228 /* we don't know what our boot device is */ 229 new_currdev.d_kind.biosdisk.slice = -1; 230 new_currdev.d_kind.biosdisk.partition = 0; 231 biosdev = -1; 232 } 233 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 234 /* The passed-in boot device is bad */ 235 new_currdev.d_kind.biosdisk.slice = -1; 236 new_currdev.d_kind.biosdisk.partition = 0; 237 biosdev = -1; 238 } else { 239 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 240 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 241 biosdev = initial_bootinfo->bi_bios_dev; 242 major = B_TYPE(initial_bootdev); 243 244 /* 245 * If we are booted by an old bootstrap, we have to guess at the BIOS 246 * unit number. We will lose if there is more than one disk type 247 * and we are not booting from the lowest-numbered disk type 248 * (ie. SCSI when IDE also exists). 249 */ 250 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 251 if (B_TYPE(initial_bootdev) == 6) 252 biosdev = 0x30 + B_UNIT(initial_bootdev); 253 else 254 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 255 } 256 } 257 new_currdev.d_type = new_currdev.d_dev->dv_type; 258 259 /* 260 * If we are booting off of a BIOS disk and we didn't succeed in determining 261 * which one we booted off of, just use disk0: as a reasonable default. 262 */ 263 if ((new_currdev.d_type == biosdisk.dv_type) && 264 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 265 printf("Can't work out which disk we are booting from.\n" 266 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 267 new_currdev.d_unit = 0; 268 } 269 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 270 i386_setcurrdev, env_nounset); 271 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 272 env_nounset); 273} 274 275COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 276 277static int 278command_reboot(int argc, char *argv[]) 279{ 280 int i; 281 282 for (i = 0; devsw[i] != NULL; ++i) 283 if (devsw[i]->dv_cleanup != NULL) 284 (devsw[i]->dv_cleanup)(); 285 286 printf("Rebooting...\n"); 287 delay(1000000); 288 __exit(0); 289} 290 291/* provide this for panic, as it's not in the startup code */ 292void 293exit(int code) 294{ 295 __exit(code); 296} 297 298COMMAND_SET(heap, "heap", "show heap usage", command_heap); 299 300static int 301command_heap(int argc, char *argv[]) 302{ 303 mallocstats(); 304 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 305 sbrk(0), heap_top); 306 return(CMD_OK); 307} 308 309/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 310static int 311isa_inb(int port) 312{ 313 u_char data; 314 315 if (__builtin_constant_p(port) && 316 (((port) & 0xffff) < 0x100) && 317 ((port) < 0x10000)) { 318 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 319 } else { 320 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 321 } 322 return(data); 323} 324 325static void 326isa_outb(int port, int value) 327{ 328 u_char al = value; 329 330 if (__builtin_constant_p(port) && 331 (((port) & 0xffff) < 0x100) && 332 ((port) < 0x10000)) { 333 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 334 } else { 335 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 336 } 337} 338 339