main.c revision 226746
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 226746 2011-10-25 19:45:12Z jhb $"); 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 <sys/param.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 80static uint64_t 81pc98_loadaddr(u_int type, void *data, uint64_t addr) 82{ 83 struct stat st; 84 85 if (type == LOAD_ELF) 86 return (roundup(addr, PAGE_SIZE)); 87 88 /* We cannot use 15M-16M area on pc98. */ 89 if (type == LOAD_RAW && addr < 0x1000000 && stat(data, &st) == 0 && 90 (st.st_size == -1 || addr + st.st_size > 0xf00000)) 91 addr = 0x1000000; 92 return (addr); 93} 94 95int 96main(void) 97{ 98 int i; 99 100 /* Set machine type to PC98_SYSTEM_PARAMETER. */ 101 set_machine_type(); 102 103 /* Pick up arguments */ 104 kargs = (void *)__args; 105 initial_howto = kargs->howto; 106 initial_bootdev = kargs->bootdev; 107 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 108 109 /* Initialize the v86 register set to a known-good state. */ 110 bzero(&v86, sizeof(v86)); 111 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 112 113 /* 114 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 115 */ 116 bios_getmem(); 117 118#if defined(LOADER_BZIP2_SUPPORT) 119 if (high_heap_size > 0) { 120 heap_top = PTOV(high_heap_base + high_heap_size); 121 heap_bottom = PTOV(high_heap_base); 122 if (high_heap_base < memtop_copyin) 123 memtop_copyin = high_heap_base; 124 } else 125#endif 126 { 127 heap_top = (void *)PTOV(bios_basemem); 128 heap_bottom = (void *)end; 129 } 130 setheap(heap_bottom, heap_top); 131 132 /* 133 * XXX Chicken-and-egg problem; we want to have console output early, but some 134 * console attributes may depend on reading from eg. the boot device, which we 135 * can't do yet. 136 * 137 * We can use printf() etc. once this is done. 138 * If the previous boot stage has requested a serial console, prefer that. 139 */ 140 bi_setboothowto(initial_howto); 141 if (initial_howto & RB_MULTIPLE) { 142 if (initial_howto & RB_SERIAL) 143 setenv("console", "comconsole vidconsole", 1); 144 else 145 setenv("console", "vidconsole comconsole", 1); 146 } else if (initial_howto & RB_SERIAL) 147 setenv("console", "comconsole", 1); 148 else if (initial_howto & RB_MUTE) 149 setenv("console", "nullconsole", 1); 150 cons_probe(); 151 152 /* 153 * Initialise the block cache 154 */ 155 bcache_init(32, 512); /* 16k cache XXX tune this */ 156 157 /* 158 * Special handling for PXE and CD booting. 159 */ 160 if (kargs->bootinfo == 0) { 161 /* 162 * We only want the PXE disk to try to init itself in the below 163 * walk through devsw if we actually booted off of PXE. 164 */ 165 if (kargs->bootflags & KARGS_FLAGS_PXE) 166 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 167 else if (kargs->bootflags & KARGS_FLAGS_CD) 168 bc_add(initial_bootdev); 169 } 170 171 archsw.arch_autoload = i386_autoload; 172 archsw.arch_getdev = i386_getdev; 173 archsw.arch_copyin = i386_copyin; 174 archsw.arch_copyout = i386_copyout; 175 archsw.arch_readin = i386_readin; 176 archsw.arch_isainb = isa_inb; 177 archsw.arch_isaoutb = isa_outb; 178 archsw.arch_loadaddr = pc98_loadaddr; 179 180 /* 181 * March through the device switch probing for things. 182 */ 183 for (i = 0; devsw[i] != NULL; i++) 184 if (devsw[i]->dv_init != NULL) 185 (devsw[i]->dv_init)(); 186 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 187 if (initial_bootinfo != NULL) { 188 initial_bootinfo->bi_basemem = bios_basemem / 1024; 189 initial_bootinfo->bi_extmem = bios_extmem / 1024; 190 } 191 192 printf("\n"); 193 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 194 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 195 196 extract_currdev(); /* set $currdev and $loaddev */ 197 setenv("LINES", "24", 1); /* optional */ 198 199 interact(); /* doesn't return */ 200 201 /* if we ever get here, it is an error */ 202 return (1); 203} 204 205/* 206 * Set the 'current device' by (if possible) recovering the boot device as 207 * supplied by the initial bootstrap. 208 * 209 * XXX should be extended for netbooting. 210 */ 211static void 212extract_currdev(void) 213{ 214 struct i386_devdesc new_currdev; 215 int major; 216 int biosdev = -1; 217 218 /* Assume we are booting from a BIOS disk by default */ 219 new_currdev.d_dev = &biosdisk; 220 221 /* new-style boot loaders such as pxeldr and cdldr */ 222 if (kargs->bootinfo == 0) { 223 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 224 /* we are booting from a CD with cdboot */ 225 new_currdev.d_dev = &bioscd; 226 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 227 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 228 /* we are booting from pxeldr */ 229 new_currdev.d_dev = &pxedisk; 230 new_currdev.d_unit = 0; 231 } else { 232 /* we don't know what our boot device is */ 233 new_currdev.d_kind.biosdisk.slice = -1; 234 new_currdev.d_kind.biosdisk.partition = 0; 235 biosdev = -1; 236 } 237 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 238 /* The passed-in boot device is bad */ 239 new_currdev.d_kind.biosdisk.slice = -1; 240 new_currdev.d_kind.biosdisk.partition = 0; 241 biosdev = -1; 242 } else { 243 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 244 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 245 biosdev = initial_bootinfo->bi_bios_dev; 246 major = B_TYPE(initial_bootdev); 247 248 /* 249 * If we are booted by an old bootstrap, we have to guess at the BIOS 250 * unit number. We will lose if there is more than one disk type 251 * and we are not booting from the lowest-numbered disk type 252 * (ie. SCSI when IDE also exists). 253 */ 254 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 255 if (B_TYPE(initial_bootdev) == 6) 256 biosdev = 0x30 + B_UNIT(initial_bootdev); 257 else 258 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 259 } 260 } 261 new_currdev.d_type = new_currdev.d_dev->dv_type; 262 263 /* 264 * If we are booting off of a BIOS disk and we didn't succeed in determining 265 * which one we booted off of, just use disk0: as a reasonable default. 266 */ 267 if ((new_currdev.d_type == biosdisk.dv_type) && 268 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 269 printf("Can't work out which disk we are booting from.\n" 270 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 271 new_currdev.d_unit = 0; 272 } 273 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 274 i386_setcurrdev, env_nounset); 275 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 276 env_nounset); 277} 278 279COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 280 281static int 282command_reboot(int argc, char *argv[]) 283{ 284 int i; 285 286 for (i = 0; devsw[i] != NULL; ++i) 287 if (devsw[i]->dv_cleanup != NULL) 288 (devsw[i]->dv_cleanup)(); 289 290 printf("Rebooting...\n"); 291 delay(1000000); 292 __exit(0); 293} 294 295/* provide this for panic, as it's not in the startup code */ 296void 297exit(int code) 298{ 299 __exit(code); 300} 301 302COMMAND_SET(heap, "heap", "show heap usage", command_heap); 303 304static int 305command_heap(int argc, char *argv[]) 306{ 307 mallocstats(); 308 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 309 sbrk(0), heap_top); 310 return(CMD_OK); 311} 312 313/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 314static int 315isa_inb(int port) 316{ 317 u_char data; 318 319 if (__builtin_constant_p(port) && 320 (((port) & 0xffff) < 0x100) && 321 ((port) < 0x10000)) { 322 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 323 } else { 324 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 325 } 326 return(data); 327} 328 329static void 330isa_outb(int port, int value) 331{ 332 u_char al = value; 333 334 if (__builtin_constant_p(port) && 335 (((port) & 0xffff) < 0x100) && 336 ((port) < 0x10000)) { 337 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 338 } else { 339 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 340 } 341} 342 343