| 1 | /*- |
| 2 | * Copyright (c) 1998 Robert Nordier |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms are freely |
| 6 | * permitted provided that the above copyright notice and this |
| 7 | * paragraph and the following disclaimer are duplicated in all |
| 8 | * such forms. |
| 9 | * |
| 10 | * This software is provided "AS IS" and without any express or |
| 11 | * implied warranties, including, without limitation, the implied |
| 12 | * warranties of merchantability and fitness for a particular |
| 13 | * purpose. |
| 14 | * |
| 15 | * $FreeBSD: src/sys/boot/i386/boot2/boot2.c,v 1.64 2003/08/25 23:28:31 obrien Exp $ |
| 16 | * $DragonFly: src/sys/boot/pc32/boot2/boot2.c,v 1.11 2004/07/18 23:40:01 dillon Exp $ |
| 17 | */ |
| 18 | #include <sys/param.h> |
| 19 | #include <sys/disklabel.h> |
| 20 | #include <sys/diskslice.h> |
| 21 | #include <sys/diskmbr.h> |
| 22 | #include <sys/dirent.h> |
| 23 | #include <machine/bootinfo.h> |
| 24 | #include <machine/elf.h> |
| 25 | |
| 26 | #include <stdarg.h> |
| 27 | |
| 28 | #include <a.out.h> |
| 29 | |
| 30 | #include <btxv86.h> |
| 31 | |
| 32 | #include "boot2.h" |
| 33 | #include "lib.h" |
| 34 | #include "../bootasm.h" |
| 35 | |
| 36 | #define SECOND 18 /* Circa that many ticks in a second. */ |
| 37 | |
| 38 | #define RBX_ASKNAME 0x0 /* -a */ |
| 39 | #define RBX_SINGLE 0x1 /* -s */ |
| 40 | #define RBX_DFLTROOT 0x5 /* -r */ |
| 41 | #define RBX_KDB 0x6 /* -d */ |
| 42 | #define RBX_CONFIG 0xa /* -c */ |
| 43 | #define RBX_VERBOSE 0xb /* -v */ |
| 44 | #define RBX_SERIAL 0xc /* -h */ |
| 45 | #define RBX_CDROM 0xd /* -C */ |
| 46 | #define RBX_GDB 0xf /* -g */ |
| 47 | #define RBX_MUTE 0x10 /* -m */ |
| 48 | #define RBX_PAUSE 0x12 /* -p */ |
| 49 | #define RBX_NOINTR 0x1c /* -n */ |
| 50 | #define RBX_VIDEO 0x1d /* -V */ |
| 51 | #define RBX_PROBEKBD 0x1e /* -P */ |
| 52 | /* 0x1f is reserved for the historical RB_BOOTINFO option */ |
| 53 | |
| 54 | #define RBF_MUTE (1 << RBX_MUTE) |
| 55 | #define RBF_SERIAL (1 << RBX_SERIAL) |
| 56 | #define RBF_VIDEO (1 << RBX_VIDEO) |
| 57 | |
| 58 | /* pass: -a, -s, -r, -d, -c, -v, -h, -C, -g, -m, -p, -V */ |
| 59 | #define RBX_MASK 0x2005ffff |
| 60 | |
| 61 | #define PATH_CONFIG "/boot.config" |
| 62 | #define PATH_BOOT3 "/boot/loader" |
| 63 | #define PATH_KERNEL "/kernel" |
| 64 | |
| 65 | #define NDEV 3 |
| 66 | #define MEM_BASE 0x12 |
| 67 | #define MEM_EXT 0x15 |
| 68 | #define V86_CY(x) ((x) & 1) |
| 69 | #define V86_ZR(x) ((x) & 0x40) |
| 70 | |
| 71 | #define DRV_HARD 0x80 |
| 72 | #define DRV_MASK 0x7f |
| 73 | |
| 74 | #define TYPE_AD 0 |
| 75 | #define TYPE_DA 1 |
| 76 | #define TYPE_MAXHARD TYPE_DA |
| 77 | #define TYPE_FD 2 |
| 78 | |
| 79 | #define NOPT 12 |
| 80 | |
| 81 | extern uint32_t _end; |
| 82 | |
| 83 | static const char optstr[NOPT] = { "VhaCgmnPprsv" }; |
| 84 | static const unsigned char flags[NOPT] = { |
| 85 | RBX_VIDEO, |
| 86 | RBX_SERIAL, |
| 87 | RBX_ASKNAME, |
| 88 | RBX_CDROM, |
| 89 | RBX_GDB, |
| 90 | RBX_MUTE, |
| 91 | RBX_NOINTR, |
| 92 | RBX_PROBEKBD, |
| 93 | RBX_PAUSE, |
| 94 | RBX_DFLTROOT, |
| 95 | RBX_SINGLE, |
| 96 | RBX_VERBOSE |
| 97 | }; |
| 98 | |
| 99 | static const char *const dev_nm[NDEV] = {"ad", "da", "fd"}; |
| 100 | static const unsigned char dev_maj[NDEV] = {30, 4, 2}; |
| 101 | |
| 102 | static struct dsk { |
| 103 | unsigned drive; |
| 104 | unsigned type; |
| 105 | unsigned unit; |
| 106 | unsigned slice; |
| 107 | unsigned part; |
| 108 | unsigned start; |
| 109 | int init; |
| 110 | } dsk; |
| 111 | static char cmd[512]; |
| 112 | static char kname[1024]; |
| 113 | static uint32_t opts; |
| 114 | static struct bootinfo bootinfo; |
| 115 | |
| 116 | void exit(int); |
| 117 | static void load(void); |
| 118 | static int parse(void); |
| 119 | static int xfsread(ino_t, void *, size_t); |
| 120 | static int dskread(void *, unsigned, unsigned); |
| 121 | static void printf(const char *,...); |
| 122 | static void putchar(int); |
| 123 | static uint32_t memsize(void); |
| 124 | static int drvread(void *, unsigned, unsigned); |
| 125 | static int keyhit(unsigned); |
| 126 | static void xputc(int); |
| 127 | static int xgetc(int); |
| 128 | static int getc(int); |
| 129 | |
| 130 | static void |
| 131 | memcpy(void *d, const void *s, int len) |
| 132 | { |
| 133 | char *dd = d; |
| 134 | const char *ss = s; |
| 135 | |
| 136 | #if 0 |
| 137 | if (dd < ss) { |
| 138 | while (--len >= 0) |
| 139 | *dd++ = *ss++; |
| 140 | } else { |
| 141 | #endif |
| 142 | while (--len >= 0) |
| 143 | dd[len] = ss[len]; |
| 144 | #if 0 |
| 145 | } |
| 146 | #endif |
| 147 | } |
| 148 | |
| 149 | static inline int |
| 150 | strcmp(const char *s1, const char *s2) |
| 151 | { |
| 152 | for (; *s1 == *s2 && *s1; s1++, s2++); |
| 153 | return (unsigned char)*s1 - (unsigned char)*s2; |
| 154 | } |
| 155 | |
| 156 | #include "ufsread.c" |
| 157 | |
| 158 | static int |
| 159 | xfsread(ino_t inode, void *buf, size_t nbyte) |
| 160 | { |
| 161 | if ((size_t)fsread(inode, buf, nbyte) != nbyte) { |
| 162 | printf("Invalid %s\n", "format"); |
| 163 | return -1; |
| 164 | } |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static inline uint32_t |
| 169 | memsize(void) |
| 170 | { |
| 171 | v86.addr = MEM_EXT; |
| 172 | v86.eax = 0x8800; |
| 173 | v86int(); |
| 174 | return v86.eax; |
| 175 | } |
| 176 | |
| 177 | static inline void |
| 178 | getstr(void) |
| 179 | { |
| 180 | char *s; |
| 181 | int c; |
| 182 | |
| 183 | s = cmd; |
| 184 | for (;;) { |
| 185 | switch (c = xgetc(0)) { |
| 186 | case 0: |
| 187 | break; |
| 188 | case '\177': |
| 189 | case '\b': |
| 190 | if (s > cmd) { |
| 191 | s--; |
| 192 | printf("\b \b"); |
| 193 | } |
| 194 | break; |
| 195 | case '\n': |
| 196 | case '\r': |
| 197 | *s = 0; |
| 198 | return; |
| 199 | default: |
| 200 | if (s - cmd < sizeof(cmd) - 1) |
| 201 | *s++ = c; |
| 202 | putchar(c); |
| 203 | } |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | static inline void |
| 208 | putc(int c) |
| 209 | { |
| 210 | v86.addr = 0x10; |
| 211 | v86.eax = 0xe00 | (c & 0xff); |
| 212 | v86.ebx = 0x7; |
| 213 | v86int(); |
| 214 | } |
| 215 | |
| 216 | int |
| 217 | main(void) |
| 218 | { |
| 219 | int autoboot; |
| 220 | ino_t ino; |
| 221 | |
| 222 | dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); |
| 223 | v86.ctl = V86_FLAGS; |
| 224 | dsk.drive = *(uint8_t *)PTOV(MEM_ARG); |
| 225 | dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD; |
| 226 | dsk.unit = dsk.drive & DRV_MASK; |
| 227 | dsk.slice = *(uint8_t *)PTOV(MEM_ARG + 1) + 1; |
| 228 | bootinfo.bi_version = BOOTINFO_VERSION; |
| 229 | bootinfo.bi_size = sizeof(bootinfo); |
| 230 | bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */ |
| 231 | bootinfo.bi_extmem = memsize(); |
| 232 | bootinfo.bi_memsizes_valid++; |
| 233 | |
| 234 | /* Process configuration file */ |
| 235 | |
| 236 | autoboot = 1; |
| 237 | |
| 238 | if ((ino = lookup(PATH_CONFIG))) |
| 239 | fsread(ino, cmd, sizeof(cmd)); |
| 240 | |
| 241 | if (cmd[0]) { |
| 242 | printf("%s: %s", PATH_CONFIG, cmd); |
| 243 | if (parse()) |
| 244 | autoboot = 0; |
| 245 | /* Do not process this command twice */ |
| 246 | *cmd = 0; |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * Setup our (serial) console after processing the config file. If |
| 251 | * the initialization fails, don't try to use the serial port. This |
| 252 | * can happen if the serial port is unmaped (happens on new laptops a lot). |
| 253 | */ |
| 254 | if ((opts & (RBF_MUTE|RBF_SERIAL|RBF_VIDEO)) == 0) |
| 255 | opts |= RBF_SERIAL|RBF_VIDEO; |
| 256 | if (opts & RBF_SERIAL) { |
| 257 | if (sio_init()) |
| 258 | opts = RBF_VIDEO; |
| 259 | } |
| 260 | |
| 261 | |
| 262 | /* |
| 263 | * Try to exec stage 3 boot loader. If interrupted by a keypress, |
| 264 | * or in case of failure, try to load a kernel directly instead. |
| 265 | */ |
| 266 | |
| 267 | if (autoboot && !*kname) { |
| 268 | memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3)); |
| 269 | if (!keyhit(3*SECOND)) { |
| 270 | load(); |
| 271 | memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL)); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /* Present the user with the boot2 prompt. */ |
| 276 | |
| 277 | for (;;) { |
| 278 | printf("\nDragonFly boot\n" |
| 279 | "%u:%s(%u,%c)%s: ", |
| 280 | dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit, |
| 281 | 'a' + dsk.part, kname); |
| 282 | if (!autoboot || keyhit(5*SECOND)) |
| 283 | getstr(); |
| 284 | else |
| 285 | putchar('\n'); |
| 286 | autoboot = 0; |
| 287 | if (cmd[0] == 0 || parse()) |
| 288 | putchar('\a'); |
| 289 | else |
| 290 | load(); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | /* XXX - Needed for btxld to link the boot2 binary; do not remove. */ |
| 295 | void |
| 296 | exit(int x) |
| 297 | { |
| 298 | } |
| 299 | |
| 300 | static void |
| 301 | load(void) |
| 302 | { |
| 303 | union { |
| 304 | struct exec ex; |
| 305 | Elf32_Ehdr eh; |
| 306 | } hdr; |
| 307 | Elf32_Phdr ep[2]; |
| 308 | Elf32_Shdr es[2]; |
| 309 | caddr_t p; |
| 310 | ino_t ino; |
| 311 | uint32_t addr, x; |
| 312 | int fmt, i, j; |
| 313 | |
| 314 | if (!(ino = lookup(kname))) { |
| 315 | if (!ls) |
| 316 | printf("No %s\n", kname); |
| 317 | return; |
| 318 | } |
| 319 | if (xfsread(ino, &hdr, sizeof(hdr))) |
| 320 | return; |
| 321 | if (N_GETMAGIC(hdr.ex) == ZMAGIC) |
| 322 | fmt = 0; |
| 323 | else if (IS_ELF(hdr.eh)) |
| 324 | fmt = 1; |
| 325 | else { |
| 326 | printf("Invalid %s\n", "format"); |
| 327 | return; |
| 328 | } |
| 329 | if (fmt == 0) { |
| 330 | addr = hdr.ex.a_entry & 0xffffff; |
| 331 | p = PTOV(addr); |
| 332 | fs_off = PAGE_SIZE; |
| 333 | if (xfsread(ino, p, hdr.ex.a_text)) |
| 334 | return; |
| 335 | p += roundup2(hdr.ex.a_text, PAGE_SIZE); |
| 336 | if (xfsread(ino, p, hdr.ex.a_data)) |
| 337 | return; |
| 338 | p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE); |
| 339 | bootinfo.bi_symtab = VTOP(p); |
| 340 | memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms)); |
| 341 | p += sizeof(hdr.ex.a_syms); |
| 342 | if (hdr.ex.a_syms) { |
| 343 | if (xfsread(ino, p, hdr.ex.a_syms)) |
| 344 | return; |
| 345 | p += hdr.ex.a_syms; |
| 346 | if (xfsread(ino, p, sizeof(int))) |
| 347 | return; |
| 348 | x = *(uint32_t *)p; |
| 349 | p += sizeof(int); |
| 350 | x -= sizeof(int); |
| 351 | if (xfsread(ino, p, x)) |
| 352 | return; |
| 353 | p += x; |
| 354 | } |
| 355 | } else { |
| 356 | fs_off = hdr.eh.e_phoff; |
| 357 | for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) { |
| 358 | if (xfsread(ino, ep + j, sizeof(ep[0]))) |
| 359 | return; |
| 360 | if (ep[j].p_type == PT_LOAD) |
| 361 | j++; |
| 362 | } |
| 363 | for (i = 0; i < 2; i++) { |
| 364 | p = PTOV(ep[i].p_paddr & 0xffffff); |
| 365 | fs_off = ep[i].p_offset; |
| 366 | if (xfsread(ino, p, ep[i].p_filesz)) |
| 367 | return; |
| 368 | } |
| 369 | p += roundup2(ep[1].p_memsz, PAGE_SIZE); |
| 370 | bootinfo.bi_symtab = VTOP(p); |
| 371 | if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) { |
| 372 | fs_off = hdr.eh.e_shoff + sizeof(es[0]) * |
| 373 | (hdr.eh.e_shstrndx + 1); |
| 374 | if (xfsread(ino, &es, sizeof(es))) |
| 375 | return; |
| 376 | for (i = 0; i < 2; i++) { |
| 377 | memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size)); |
| 378 | p += sizeof(es[i].sh_size); |
| 379 | fs_off = es[i].sh_offset; |
| 380 | if (xfsread(ino, p, es[i].sh_size)) |
| 381 | return; |
| 382 | p += es[i].sh_size; |
| 383 | } |
| 384 | } |
| 385 | addr = hdr.eh.e_entry & 0xffffff; |
| 386 | } |
| 387 | bootinfo.bi_esymtab = VTOP(p); |
| 388 | bootinfo.bi_kernelname = VTOP(kname); |
| 389 | bootinfo.bi_bios_dev = dsk.drive; |
| 390 | __exec((caddr_t)addr, opts & RBX_MASK, |
| 391 | MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part), |
| 392 | 0, 0, 0, VTOP(&bootinfo)); |
| 393 | } |
| 394 | |
| 395 | static int |
| 396 | parse() |
| 397 | { |
| 398 | char *arg = cmd; |
| 399 | char *p, *q; |
| 400 | unsigned int drv; |
| 401 | int c, i; |
| 402 | |
| 403 | while ((c = *arg++)) { |
| 404 | if (c == ' ' || c == '\t' || c == '\n') |
| 405 | continue; |
| 406 | for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++) |
| 407 | ; |
| 408 | if (*p) |
| 409 | *p++ = 0; |
| 410 | if (c == '-') { |
| 411 | while ((c = *arg++)) { |
| 412 | for (i = NOPT - 1; i >= 0; --i) { |
| 413 | if (optstr[i] == c) { |
| 414 | opts ^= 1 << flags[i]; |
| 415 | goto ok; |
| 416 | } |
| 417 | } |
| 418 | return(-1); |
| 419 | ok: ; /* ugly but save space */ |
| 420 | } |
| 421 | if (opts & (1 << RBX_PROBEKBD)) { |
| 422 | i = *(uint8_t *)PTOV(0x496) & 0x10; |
| 423 | if (!i) { |
| 424 | printf("NO KB\n"); |
| 425 | opts |= RBF_VIDEO | RBF_SERIAL; |
| 426 | } |
| 427 | opts &= ~(1 << RBX_PROBEKBD); |
| 428 | } |
| 429 | } else { |
| 430 | for (q = arg--; *q && *q != '('; q++); |
| 431 | if (*q) { |
| 432 | drv = -1; |
| 433 | if (arg[1] == ':') { |
| 434 | drv = *arg - '0'; |
| 435 | if (drv > 9) |
| 436 | return (-1); |
| 437 | arg += 2; |
| 438 | } |
| 439 | if (q - arg != 2) |
| 440 | return -1; |
| 441 | for (i = 0; arg[0] != dev_nm[i][0] || |
| 442 | arg[1] != dev_nm[i][1]; i++) |
| 443 | if (i == NDEV - 1) |
| 444 | return -1; |
| 445 | dsk.type = i; |
| 446 | arg += 3; |
| 447 | dsk.unit = *arg - '0'; |
| 448 | if (arg[1] != ',' || dsk.unit > 9) |
| 449 | return -1; |
| 450 | arg += 2; |
| 451 | dsk.slice = WHOLE_DISK_SLICE; |
| 452 | if (arg[1] == ',') { |
| 453 | dsk.slice = *arg - '0' + 1; |
| 454 | if (dsk.slice > NDOSPART) |
| 455 | return -1; |
| 456 | arg += 2; |
| 457 | } |
| 458 | if (arg[1] != ')') |
| 459 | return -1; |
| 460 | dsk.part = *arg - 'a'; |
| 461 | if (dsk.part > 7) |
| 462 | return (-1); |
| 463 | arg += 2; |
| 464 | if (drv == -1) |
| 465 | drv = dsk.unit; |
| 466 | dsk.drive = (dsk.type <= TYPE_MAXHARD |
| 467 | ? DRV_HARD : 0) + drv; |
| 468 | dsk_meta = 0; |
| 469 | } |
| 470 | if ((i = p - arg - !*(p - 1))) { |
| 471 | if ((size_t)i >= sizeof(kname)) |
| 472 | return -1; |
| 473 | memcpy(kname, arg, i + 1); |
| 474 | } |
| 475 | } |
| 476 | arg = p; |
| 477 | } |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static int |
| 482 | dskread(void *buf, unsigned lba, unsigned nblk) |
| 483 | { |
| 484 | struct dos_partition *dp; |
| 485 | struct disklabel *d; |
| 486 | char *sec; |
| 487 | unsigned sl, i; |
| 488 | |
| 489 | if (!dsk_meta) { |
| 490 | sec = dmadat->secbuf; |
| 491 | dsk.start = 0; |
| 492 | if (drvread(sec, DOSBBSECTOR, 1)) |
| 493 | return -1; |
| 494 | dp = (void *)(sec + DOSPARTOFF); |
| 495 | sl = dsk.slice; |
| 496 | if (sl < BASE_SLICE) { |
| 497 | for (i = 0; i < NDOSPART; i++) |
| 498 | if (dp[i].dp_typ == DOSPTYP_386BSD && |
| 499 | (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) { |
| 500 | sl = BASE_SLICE + i; |
| 501 | if (dp[i].dp_flag & 0x80 || |
| 502 | dsk.slice == COMPATIBILITY_SLICE) |
| 503 | break; |
| 504 | } |
| 505 | if (dsk.slice == WHOLE_DISK_SLICE) |
| 506 | dsk.slice = sl; |
| 507 | } |
| 508 | if (sl != WHOLE_DISK_SLICE) { |
| 509 | if (sl != COMPATIBILITY_SLICE) |
| 510 | dp += sl - BASE_SLICE; |
| 511 | if (dp->dp_typ != DOSPTYP_386BSD) { |
| 512 | printf("Invalid %s\n", "slice"); |
| 513 | return -1; |
| 514 | } |
| 515 | dsk.start = dp->dp_start; |
| 516 | } |
| 517 | if (drvread(sec, dsk.start + LABELSECTOR, 1)) |
| 518 | return -1; |
| 519 | d = (void *)(sec + LABELOFFSET); |
| 520 | if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) { |
| 521 | if (dsk.part != RAW_PART) { |
| 522 | printf("Invalid %s\n", "label"); |
| 523 | return -1; |
| 524 | } |
| 525 | } else { |
| 526 | if (!dsk.init) { |
| 527 | if (d->d_type == DTYPE_SCSI) |
| 528 | dsk.type = TYPE_DA; |
| 529 | dsk.init++; |
| 530 | } |
| 531 | if (dsk.part >= d->d_npartitions || |
| 532 | !d->d_partitions[dsk.part].p_size) { |
| 533 | printf("Invalid %s\n", "partition"); |
| 534 | return -1; |
| 535 | } |
| 536 | dsk.start += d->d_partitions[dsk.part].p_offset; |
| 537 | dsk.start -= d->d_partitions[RAW_PART].p_offset; |
| 538 | } |
| 539 | } |
| 540 | return drvread(buf, dsk.start + lba, nblk); |
| 541 | } |
| 542 | |
| 543 | static void |
| 544 | printf(const char *fmt,...) |
| 545 | { |
| 546 | va_list ap; |
| 547 | char buf[10]; |
| 548 | char *s; |
| 549 | unsigned u; |
| 550 | int c; |
| 551 | |
| 552 | va_start(ap, fmt); |
| 553 | while ((c = *fmt++)) { |
| 554 | if (c == '%') { |
| 555 | c = *fmt++; |
| 556 | switch (c) { |
| 557 | case 'c': |
| 558 | putchar(va_arg(ap, int)); |
| 559 | continue; |
| 560 | case 's': |
| 561 | for (s = va_arg(ap, char *); *s; s++) |
| 562 | putchar(*s); |
| 563 | continue; |
| 564 | case 'u': |
| 565 | u = va_arg(ap, unsigned); |
| 566 | s = buf; |
| 567 | do |
| 568 | *s++ = '0' + u % 10U; |
| 569 | while (u /= 10U); |
| 570 | while (--s >= buf) |
| 571 | putchar(*s); |
| 572 | continue; |
| 573 | } |
| 574 | } |
| 575 | putchar(c); |
| 576 | } |
| 577 | va_end(ap); |
| 578 | return; |
| 579 | } |
| 580 | |
| 581 | static void |
| 582 | putchar(int c) |
| 583 | { |
| 584 | if (c == '\n') |
| 585 | xputc('\r'); |
| 586 | xputc(c); |
| 587 | } |
| 588 | |
| 589 | static int |
| 590 | drvread(void *buf, unsigned lba, unsigned nblk) |
| 591 | { |
| 592 | static unsigned c = 0x2d5c7c2f; /* twiddle */ |
| 593 | |
| 594 | c = (c << 8) | (c >> 24); |
| 595 | xputc(c); |
| 596 | xputc('\b'); |
| 597 | v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS; |
| 598 | v86.addr = XREADORG; /* call to xread in boot1 */ |
| 599 | v86.es = VTOPSEG(buf); |
| 600 | v86.eax = lba; |
| 601 | v86.ebx = VTOPOFF(buf); |
| 602 | v86.ecx = lba >> 16; |
| 603 | v86.edx = nblk << 8 | dsk.drive; |
| 604 | v86int(); |
| 605 | v86.ctl = V86_FLAGS; |
| 606 | if (V86_CY(v86.efl)) { |
| 607 | printf("error %u lba %u\n", v86.eax >> 8 & 0xff, lba); |
| 608 | return -1; |
| 609 | } |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | static int |
| 614 | keyhit(unsigned ticks) |
| 615 | { |
| 616 | uint32_t t0, t1; |
| 617 | |
| 618 | if (opts & 1 << RBX_NOINTR) |
| 619 | return 0; |
| 620 | t0 = 0; |
| 621 | for (;;) { |
| 622 | if (xgetc(1)) |
| 623 | return 1; |
| 624 | t1 = *(uint32_t *)PTOV(0x46c); |
| 625 | if (!t0) |
| 626 | t0 = t1; |
| 627 | if (t1 < t0 || t1 >= t0 + ticks) |
| 628 | return 0; |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | static void |
| 633 | xputc(int c) |
| 634 | { |
| 635 | if (opts & RBF_VIDEO) |
| 636 | putc(c); |
| 637 | if (opts & RBF_SERIAL) |
| 638 | sio_putc(c); |
| 639 | } |
| 640 | |
| 641 | static int |
| 642 | xgetc(int fn) |
| 643 | { |
| 644 | if (opts & 1 << RBX_NOINTR) |
| 645 | return 0; |
| 646 | for (;;) { |
| 647 | if ((opts & RBF_VIDEO) && getc(1)) |
| 648 | return fn ? 1 : getc(0); |
| 649 | if ((opts & RBF_SERIAL) && sio_ischar()) |
| 650 | return fn ? 1 : sio_getc(); |
| 651 | if (fn) |
| 652 | return 0; |
| 653 | } |
| 654 | } |
| 655 | |
| 656 | static int |
| 657 | getc(int fn) |
| 658 | { |
| 659 | v86.addr = 0x16; |
| 660 | v86.eax = fn << 8; |
| 661 | v86int(); |
| 662 | return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl); |
| 663 | } |