boot2.c revision 218946
114981Speter/*- 214123Speter * Copyright (c) 2008-2009 TAKAHASHI Yoshihiro 314123Speter * Copyright (c) 1998 Robert Nordier 414981Speter * All rights reserved. 514123Speter * 614123Speter * Redistribution and use in source and binary forms are freely 714123Speter * permitted provided that the above copyright notice and this 814123Speter * paragraph and the following disclaimer are duplicated in all 914123Speter * such forms. 1014981Speter * 1114123Speter * This software is provided "AS IS" and without any express or 1214981Speter * implied warranties, including, without limitation, the implied 1314981Speter * warranties of merchantability and fitness for a particular 1414981Speter * purpose. 1514981Speter */ 1614981Speter 1714981Speter#include <sys/cdefs.h> 1814981Speter__FBSDID("$FreeBSD: head/sys/boot/pc98/boot2/boot2.c 218946 2011-02-22 13:52:03Z nyan $"); 1914981Speter 2014981Speter#include <sys/param.h> 2114981Speter#include <sys/disklabel.h> 2214981Speter#include <sys/diskpc98.h> 2314123Speter#include <sys/dirent.h> 2414123Speter#include <sys/reboot.h> 2514123Speter 2614981Speter#include <machine/bootinfo.h> 27#include <machine/cpufunc.h> 28#include <machine/elf.h> 29#include <machine/psl.h> 30 31#include <stdarg.h> 32 33#include <a.out.h> 34 35#include <btxv86.h> 36 37#include "boot2.h" 38#include "lib.h" 39 40#define IO_KEYBOARD 1 41#define IO_SERIAL 2 42 43#define SECOND 1 /* Circa that many ticks in a second. */ 44 45#define RBX_ASKNAME 0x0 /* -a */ 46#define RBX_SINGLE 0x1 /* -s */ 47/* 0x2 is reserved for log2(RB_NOSYNC). */ 48/* 0x3 is reserved for log2(RB_HALT). */ 49/* 0x4 is reserved for log2(RB_INITNAME). */ 50#define RBX_DFLTROOT 0x5 /* -r */ 51#define RBX_KDB 0x6 /* -d */ 52/* 0x7 is reserved for log2(RB_RDONLY). */ 53/* 0x8 is reserved for log2(RB_DUMP). */ 54/* 0x9 is reserved for log2(RB_MINIROOT). */ 55#define RBX_CONFIG 0xa /* -c */ 56#define RBX_VERBOSE 0xb /* -v */ 57#define RBX_SERIAL 0xc /* -h */ 58#define RBX_CDROM 0xd /* -C */ 59/* 0xe is reserved for log2(RB_POWEROFF). */ 60#define RBX_GDB 0xf /* -g */ 61#define RBX_MUTE 0x10 /* -m */ 62/* 0x11 is reserved for log2(RB_SELFTEST). */ 63/* 0x12 is reserved for boot programs. */ 64/* 0x13 is reserved for boot programs. */ 65#define RBX_PAUSE 0x14 /* -p */ 66#define RBX_QUIET 0x15 /* -q */ 67#define RBX_NOINTR 0x1c /* -n */ 68/* 0x1d is reserved for log2(RB_MULTIPLE) and is just misnamed here. */ 69#define RBX_DUAL 0x1d /* -D */ 70/* 0x1f is reserved for log2(RB_BOOTINFO). */ 71 72/* pass: -a, -s, -r, -d, -c, -v, -h, -C, -g, -m, -p, -D */ 73#define RBX_MASK (OPT_SET(RBX_ASKNAME) | OPT_SET(RBX_SINGLE) | \ 74 OPT_SET(RBX_DFLTROOT) | OPT_SET(RBX_KDB ) | \ 75 OPT_SET(RBX_CONFIG) | OPT_SET(RBX_VERBOSE) | \ 76 OPT_SET(RBX_SERIAL) | OPT_SET(RBX_CDROM) | \ 77 OPT_SET(RBX_GDB ) | OPT_SET(RBX_MUTE) | \ 78 OPT_SET(RBX_PAUSE) | OPT_SET(RBX_DUAL)) 79 80#define PATH_CONFIG "/boot.config" 81#define PATH_BOOT3 "/boot/loader" 82#define PATH_KERNEL "/boot/kernel/kernel" 83 84#define ARGS 0x900 85#define NOPT 14 86#define NDEV 3 87#define V86_CY(x) ((x) & PSL_C) 88#define V86_ZR(x) ((x) & PSL_Z) 89 90#define DRV_DISK 0xf0 91#define DRV_UNIT 0x0f 92 93#define TYPE_AD 0 94#define TYPE_DA 1 95#define TYPE_FD 2 96 97#define OPT_SET(opt) (1 << (opt)) 98#define OPT_CHECK(opt) ((opts) & OPT_SET(opt)) 99 100extern uint32_t _end; 101 102static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */ 103static const unsigned char flags[NOPT] = { 104 RBX_DUAL, 105 RBX_SERIAL, 106 RBX_ASKNAME, 107 RBX_CDROM, 108 RBX_CONFIG, 109 RBX_KDB, 110 RBX_GDB, 111 RBX_MUTE, 112 RBX_NOINTR, 113 RBX_PAUSE, 114 RBX_QUIET, 115 RBX_DFLTROOT, 116 RBX_SINGLE, 117 RBX_VERBOSE 118}; 119 120static const char *const dev_nm[NDEV] = {"ad", "da", "fd"}; 121static const unsigned char dev_maj[NDEV] = {30, 4, 2}; 122static const unsigned char dev_daua[NDEV] = {0x80, 0xa0, 0x90}; 123 124static struct dsk { 125 unsigned daua; 126 unsigned type; 127 unsigned disk; 128 unsigned unit; 129 unsigned head; 130 unsigned sec; 131 unsigned slice; 132 unsigned part; 133 unsigned start; 134} dsk; 135static char cmd[512], cmddup[512]; 136static char kname[1024]; 137static uint32_t opts; 138static int comspeed = SIOSPD; 139static struct bootinfo bootinfo; 140static uint8_t ioctrl = IO_KEYBOARD; 141 142void exit(int); 143static void load(void); 144static int parse(void); 145static int xfsread(ino_t, void *, size_t); 146static int dskread(void *, unsigned, unsigned); 147static void printf(const char *,...); 148static void putchar(int); 149static uint32_t memsize(void); 150static int drvread(void *, unsigned); 151static int keyhit(unsigned); 152static int xputc(int); 153static int xgetc(int); 154static int getc(int); 155 156static void memcpy(void *, const void *, int); 157static void 158memcpy(void *dst, const void *src, int len) 159{ 160 const char *s = src; 161 char *d = dst; 162 163 while (len--) 164 *d++ = *s++; 165} 166 167static inline int 168strcmp(const char *s1, const char *s2) 169{ 170 for (; *s1 == *s2 && *s1; s1++, s2++); 171 return (unsigned char)*s1 - (unsigned char)*s2; 172} 173 174#define UFS_SMALL_CGBASE 175#include "ufsread.c" 176 177static inline int 178xfsread(ino_t inode, void *buf, size_t nbyte) 179{ 180 if ((size_t)fsread(inode, buf, nbyte) != nbyte) { 181 printf("Invalid %s\n", "format"); 182 return -1; 183 } 184 return 0; 185} 186 187static inline uint32_t 188memsize(void) 189{ 190 return (*(u_char *)PTOV(0x401) * 128 * 1024 + 191 *(uint16_t *)PTOV(0x594) * 1024 * 1024); 192} 193 194static inline void 195getstr(void) 196{ 197 char *s; 198 int c; 199 200 s = cmd; 201 for (;;) { 202 switch (c = xgetc(0)) { 203 case 0: 204 break; 205 case '\177': 206 case '\b': 207 if (s > cmd) { 208 s--; 209 printf("\b \b"); 210 } 211 break; 212 case '\n': 213 case '\r': 214 *s = 0; 215 return; 216 default: 217 if (s - cmd < sizeof(cmd) - 1) 218 *s++ = c; 219 putchar(c); 220 } 221 } 222} 223 224static inline void 225putc(int c) 226{ 227 228 v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS; 229 v86.addr = PUTCORG; /* call to putc in boot1 */ 230 v86.eax = c; 231 v86int(); 232 v86.ctl = V86_FLAGS; 233} 234 235static inline int 236is_scsi_hd(void) 237{ 238 239 if ((*(u_char *)PTOV(0x482) >> dsk.unit) & 0x01) 240 return 1; 241 242 return 0; 243} 244 245static inline void 246fix_sector_size(void) 247{ 248 u_char *p; 249 250 p = (u_char *)PTOV(0x460 + dsk.unit * 4); /* SCSI equipment parameter */ 251 252 if ((p[0] & 0x1f) == 7) { /* SCSI MO */ 253 if (!(p[3] & 0x30)) { /* 256B / sector */ 254 p[3] |= 0x10; /* forced set 512B / sector */ 255 p[3 + 0xa1000] |= 0x10; 256 } 257 } 258} 259 260static inline uint32_t 261get_diskinfo(void) 262{ 263 264 if (dsk.disk == 0x30) { /* 1440KB FD */ 265 /* 80 cylinders, 2 heads, 18 sectors */ 266 return (80 << 16) | (2 << 8) | 18; 267 } else if (dsk.disk == 0x90) { /* 1200KB FD */ 268 /* 80 cylinders, 2 heads, 15 sectors */ 269 return (80 << 16) | (2 << 8) | 15; 270 } else if (dsk.disk == 0x80 || is_scsi_hd()) { /* IDE or SCSI HDD */ 271 v86.addr = 0x1b; 272 v86.eax = 0x8400 | dsk.daua; 273 v86int(); 274 return (v86.ecx << 16) | v86.edx; 275 } 276 277 /* SCSI MO or CD */ 278 fix_sector_size(); /* SCSI MO */ 279 280 /* other SCSI devices */ 281 return (65535 << 16) | (8 << 8) | 32; 282} 283 284static void 285set_dsk(void) 286{ 287 uint32_t di; 288 289 di = get_diskinfo(); 290 291 dsk.head = (di >> 8) & 0xff; 292 dsk.sec = di & 0xff; 293 dsk.start = 0; 294} 295 296#ifdef GET_BIOSGEOM 297static uint32_t 298bd_getbigeom(int bunit) 299{ 300 int hds = 0; 301 int unit = 0x80; /* IDE HDD */ 302 u_int addr = 0x55d; 303 304 while (unit < 0xa7) { 305 if (*(u_char *)PTOV(addr) & (1 << (unit & 0x0f))) 306 if (hds++ == bunit) 307 break; 308 309 if (unit >= 0xA0) { 310 int media = ((unsigned *)PTOV(0x460))[unit & 0x0F] & 0x1F; 311 312 if (media == 7 && hds++ == bunit) /* SCSI MO */ 313 return(0xFFFE0820); /* C:65535 H:8 S:32 */ 314 } 315 if (++unit == 0x84) { 316 unit = 0xA0; /* SCSI HDD */ 317 addr = 0x482; 318 } 319 } 320 if (unit == 0xa7) 321 return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */ 322 v86.addr = 0x1b; 323 v86.eax = 0x8400 | unit; 324 v86int(); 325 if (v86.efl & 0x1) 326 return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */ 327 return ((v86.ecx & 0xffff) << 16) | (v86.edx & 0xffff); 328} 329#endif 330 331static int 332check_slice(void) 333{ 334 struct pc98_partition *dp; 335 char *sec; 336 unsigned i, cyl; 337 338 sec = dmadat->secbuf; 339 cyl = *(uint16_t *)PTOV(ARGS); 340 set_dsk(); 341 342 if (dsk.type == TYPE_FD) 343 return (WHOLE_DISK_SLICE); 344 if (drvread(sec, DOSBBSECTOR + 1)) 345 return (WHOLE_DISK_SLICE); /* Read error */ 346 dp = (void *)(sec + DOSPARTOFF); 347 for (i = 0; i < NDOSPART; i++) { 348 if (dp[i].dp_mid == DOSMID_386BSD) { 349 if (dp[i].dp_scyl <= cyl && cyl <= dp[i].dp_ecyl) 350 return (BASE_SLICE + i); 351 } 352 } 353 354 return (WHOLE_DISK_SLICE); 355} 356 357int 358main(void) 359{ 360#ifdef GET_BIOSGEOM 361 int i; 362#endif 363 uint8_t autoboot; 364 ino_t ino; 365 366 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); 367 v86.ctl = V86_FLAGS; 368 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 369 dsk.daua = *(uint8_t *)PTOV(0x584); 370 dsk.disk = dsk.daua & DRV_DISK; 371 dsk.unit = dsk.daua & DRV_UNIT; 372 if (dsk.disk == 0x80) 373 dsk.type = TYPE_AD; 374 else if (dsk.disk == 0xa0) 375 dsk.type = TYPE_DA; 376 else /* if (dsk.disk == 0x30 || dsk.disk == 0x90) */ 377 dsk.type = TYPE_FD; 378 dsk.slice = check_slice(); 379#ifdef GET_BIOSGEOM 380 for (i = 0; i < N_BIOS_GEOM; i++) 381 bootinfo.bi_bios_geom[i] = bd_getbigeom(i); 382#endif 383 bootinfo.bi_version = BOOTINFO_VERSION; 384 bootinfo.bi_size = sizeof(bootinfo); 385 bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */ 386 bootinfo.bi_extmem = memsize(); 387 bootinfo.bi_memsizes_valid++; 388 389 /* Process configuration file */ 390 391 autoboot = 1; 392 393 if ((ino = lookup(PATH_CONFIG))) 394 fsread(ino, cmd, sizeof(cmd)); 395 396 if (*cmd) { 397 memcpy(cmddup, cmd, sizeof(cmd)); 398 if (parse()) 399 autoboot = 0; 400 if (!OPT_CHECK(RBX_QUIET)) 401 printf("%s: %s", PATH_CONFIG, cmddup); 402 /* Do not process this command twice */ 403 *cmd = 0; 404 } 405 406 /* 407 * Try to exec stage 3 boot loader. If interrupted by a keypress, 408 * or in case of failure, try to load a kernel directly instead. 409 */ 410 411 if (autoboot && !*kname) { 412 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3)); 413 if (!keyhit(3*SECOND)) { 414 load(); 415 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL)); 416 } 417 } 418 419 /* Present the user with the boot2 prompt. */ 420 421 for (;;) { 422 if (!autoboot || !OPT_CHECK(RBX_QUIET)) 423 printf("\nFreeBSD/pc98 boot\n" 424 "Default: %u:%s(%u,%c)%s\n" 425 "boot: ", 426 dsk.unit, dev_nm[dsk.type], dsk.unit, 427 'a' + dsk.part, kname); 428 if (ioctrl & IO_SERIAL) 429 sio_flush(); 430 if (!autoboot || keyhit(5*SECOND)) 431 getstr(); 432 else if (!autoboot || !OPT_CHECK(RBX_QUIET)) 433 putchar('\n'); 434 autoboot = 0; 435 if (parse()) 436 putchar('\a'); 437 else 438 load(); 439 } 440} 441 442/* XXX - Needed for btxld to link the boot2 binary; do not remove. */ 443void 444exit(int x) 445{ 446} 447 448static void 449load(void) 450{ 451 union { 452 struct exec ex; 453 Elf32_Ehdr eh; 454 } hdr; 455 static Elf32_Phdr ep[2]; 456 static Elf32_Shdr es[2]; 457 caddr_t p; 458 ino_t ino; 459 uint32_t addr, x; 460 int i, j; 461 uint8_t fmt; 462 463 if (!(ino = lookup(kname))) { 464 if (!ls) 465 printf("No %s\n", kname); 466 return; 467 } 468 if (xfsread(ino, &hdr, sizeof(hdr))) 469 return; 470 if (N_GETMAGIC(hdr.ex) == ZMAGIC) 471 fmt = 0; 472 else if (IS_ELF(hdr.eh)) 473 fmt = 1; 474 else { 475 printf("Invalid %s\n", "format"); 476 return; 477 } 478 if (fmt == 0) { 479 addr = hdr.ex.a_entry & 0xffffff; 480 p = PTOV(addr); 481 fs_off = PAGE_SIZE; 482 if (xfsread(ino, p, hdr.ex.a_text)) 483 return; 484 p += roundup2(hdr.ex.a_text, PAGE_SIZE); 485 if (xfsread(ino, p, hdr.ex.a_data)) 486 return; 487 } else { 488 fs_off = hdr.eh.e_phoff; 489 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) { 490 if (xfsread(ino, ep + j, sizeof(ep[0]))) 491 return; 492 if (ep[j].p_type == PT_LOAD) 493 j++; 494 } 495 for (i = 0; i < 2; i++) { 496 p = PTOV(ep[i].p_paddr & 0xffffff); 497 fs_off = ep[i].p_offset; 498 if (xfsread(ino, p, ep[i].p_filesz)) 499 return; 500 } 501 p += roundup2(ep[1].p_memsz, PAGE_SIZE); 502 bootinfo.bi_symtab = VTOP(p); 503 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) { 504 fs_off = hdr.eh.e_shoff + sizeof(es[0]) * 505 (hdr.eh.e_shstrndx + 1); 506 if (xfsread(ino, &es, sizeof(es))) 507 return; 508 for (i = 0; i < 2; i++) { 509 *(Elf32_Word *)p = es[i].sh_size; 510 p += sizeof(es[i].sh_size); 511 fs_off = es[i].sh_offset; 512 if (xfsread(ino, p, es[i].sh_size)) 513 return; 514 p += es[i].sh_size; 515 } 516 } 517 addr = hdr.eh.e_entry & 0xffffff; 518 bootinfo.bi_esymtab = VTOP(p); 519 } 520 bootinfo.bi_kernelname = VTOP(kname); 521 bootinfo.bi_bios_dev = dsk.daua; 522 __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK), 523 MAKEBOOTDEV(dev_maj[dsk.type], dsk.slice, dsk.unit, dsk.part), 524 0, 0, 0, VTOP(&bootinfo)); 525} 526 527static int 528parse() 529{ 530 char *arg = cmd; 531 char *ep, *p, *q; 532 const char *cp; 533 unsigned int drv; 534 int c, i, j; 535 536 while ((c = *arg++)) { 537 if (c == ' ' || c == '\t' || c == '\n') 538 continue; 539 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++); 540 ep = p; 541 if (*p) 542 *p++ = 0; 543 if (c == '-') { 544 while ((c = *arg++)) { 545 if (c == 'P') { 546 if (*(uint8_t *)PTOV(0x481) & 0x48) { 547 cp = "yes"; 548 } else { 549 opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL); 550 cp = "no"; 551 } 552 printf("Keyboard: %s\n", cp); 553 continue; 554 } else if (c == 'S') { 555 j = 0; 556 while ((unsigned int)(i = *arg++ - '0') <= 9) 557 j = j * 10 + i; 558 if (j > 0 && i == -'0') { 559 comspeed = j; 560 break; 561 } 562 /* Fall through to error below ('S' not in optstr[]). */ 563 } 564 for (i = 0; c != optstr[i]; i++) 565 if (i == NOPT - 1) 566 return -1; 567 opts ^= OPT_SET(flags[i]); 568 } 569 ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) : 570 OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD; 571 if (ioctrl & IO_SERIAL) 572 sio_init(115200 / comspeed); 573 } else { 574 for (q = arg--; *q && *q != '('; q++); 575 if (*q) { 576 drv = -1; 577 if (arg[1] == ':') { 578 drv = *arg - '0'; 579 if (drv > 9) 580 return (-1); 581 arg += 2; 582 } 583 if (q - arg != 2) 584 return -1; 585 for (i = 0; arg[0] != dev_nm[i][0] || 586 arg[1] != dev_nm[i][1]; i++) 587 if (i == NDEV - 1) 588 return -1; 589 dsk.type = i; 590 arg += 3; 591 dsk.unit = *arg - '0'; 592 if (arg[1] != ',' || dsk.unit > 9) 593 return -1; 594 arg += 2; 595 dsk.slice = WHOLE_DISK_SLICE; 596 if (arg[1] == ',') { 597 dsk.slice = *arg - '0' + 1; 598 if (dsk.slice > NDOSPART + 1) 599 return -1; 600 arg += 2; 601 } 602 if (arg[1] != ')') 603 return -1; 604 dsk.part = *arg - 'a'; 605 if (dsk.part > 7) 606 return (-1); 607 arg += 2; 608 if (drv == -1) 609 drv = dsk.unit; 610 dsk.disk = dev_daua[dsk.type]; 611 dsk.daua = dsk.disk | dsk.unit; 612 dsk_meta = 0; 613 } 614 if ((i = ep - arg)) { 615 if ((size_t)i >= sizeof(kname)) 616 return -1; 617 memcpy(kname, arg, i + 1); 618 } 619 } 620 arg = p; 621 } 622 return 0; 623} 624 625static int 626dskread(void *buf, unsigned lba, unsigned nblk) 627{ 628 struct pc98_partition *dp; 629 struct disklabel *d; 630 char *sec; 631 unsigned sl, i; 632 u_char *p; 633 634 if (!dsk_meta) { 635 sec = dmadat->secbuf; 636 set_dsk(); 637 if (dsk.type == TYPE_FD) 638 goto unsliced; 639 if (drvread(sec, DOSBBSECTOR + 1)) 640 return -1; 641 dp = (void *)(sec + DOSPARTOFF); 642 sl = dsk.slice; 643 if (sl < BASE_SLICE) { 644 for (i = 0; i < NDOSPART; i++) 645 if (dp[i].dp_mid == DOSMID_386BSD) { 646 sl = BASE_SLICE + i; 647 break; 648 } 649 dsk.slice = sl; 650 } 651 if (sl != WHOLE_DISK_SLICE) { 652 dp += sl - BASE_SLICE; 653 if (dp->dp_mid != DOSMID_386BSD) { 654 printf("Invalid %s\n", "slice"); 655 return -1; 656 } 657 dsk.start = dp->dp_scyl * dsk.head * dsk.sec + 658 dp->dp_shd * dsk.sec + dp->dp_ssect; 659 } 660 if (drvread(sec, dsk.start + LABELSECTOR)) 661 return -1; 662 d = (void *)(sec + LABELOFFSET); 663 if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) { 664 if (dsk.part != RAW_PART) { 665 printf("Invalid %s\n", "label"); 666 return -1; 667 } 668 } else { 669 if (dsk.part >= d->d_npartitions || 670 !d->d_partitions[dsk.part].p_size) { 671 printf("Invalid %s\n", "partition"); 672 return -1; 673 } 674 dsk.start += d->d_partitions[dsk.part].p_offset; 675 dsk.start -= d->d_partitions[RAW_PART].p_offset; 676 } 677 unsliced: ; 678 } 679 for (p = buf; nblk; p += 512, lba++, nblk--) { 680 if ((i = drvread(p, dsk.start + lba))) 681 return i; 682 } 683 return 0; 684} 685 686static void 687printf(const char *fmt,...) 688{ 689 va_list ap; 690 char buf[10]; 691 char *s; 692 unsigned u; 693 int c; 694 695 va_start(ap, fmt); 696 while ((c = *fmt++)) { 697 if (c == '%') { 698 c = *fmt++; 699 switch (c) { 700 case 'c': 701 putchar(va_arg(ap, int)); 702 continue; 703 case 's': 704 for (s = va_arg(ap, char *); *s; s++) 705 putchar(*s); 706 continue; 707 case 'u': 708 u = va_arg(ap, unsigned); 709 s = buf; 710 do 711 *s++ = '0' + u % 10U; 712 while (u /= 10U); 713 while (--s >= buf) 714 putchar(*s); 715 continue; 716 } 717 } 718 putchar(c); 719 } 720 va_end(ap); 721 return; 722} 723 724static void 725putchar(int c) 726{ 727 if (c == '\n') 728 xputc('\r'); 729 xputc(c); 730} 731 732static int 733drvread(void *buf, unsigned lba) 734{ 735 static unsigned c = 0x2d5c7c2f; 736 unsigned bpc, x, cyl, head, sec; 737 738 bpc = dsk.sec * dsk.head; 739 cyl = lba / bpc; 740 x = lba % bpc; 741 head = x / dsk.sec; 742 sec = x % dsk.sec; 743 744 if (!OPT_CHECK(RBX_QUIET)) 745 printf("%c\b", c = c << 8 | c >> 24); 746 v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS; 747 v86.addr = READORG; /* call to read in boot1 */ 748 v86.ecx = cyl; 749 v86.edx = (head << 8) | sec; 750 v86.edi = lba; 751 v86.ebx = 512; 752 v86.es = VTOPSEG(buf); 753 v86.ebp = VTOPOFF(buf); 754 v86int(); 755 v86.ctl = V86_FLAGS; 756 if (V86_CY(v86.efl)) { 757 printf("error %u c/h/s %u/%u/%u lba %u\n", v86.eax >> 8 & 0xff, 758 cyl, head, sec, lba); 759 return -1; 760 } 761 return 0; 762} 763 764static inline void 765delay(void) 766{ 767 int i; 768 769 i = 800; 770 do { 771 outb(0x5f, 0); /* about 600ns */ 772 } while (--i >= 0); 773} 774 775static int 776keyhit(unsigned sec) 777{ 778 unsigned i; 779 780 if (OPT_CHECK(RBX_NOINTR)) 781 return 0; 782 for (i = 0; i < sec * 1000; i++) { 783 if (xgetc(1)) 784 return 1; 785 delay(); 786 } 787 return 0; 788} 789 790static int 791xputc(int c) 792{ 793 if (ioctrl & IO_KEYBOARD) 794 putc(c); 795 if (ioctrl & IO_SERIAL) 796 sio_putc(c); 797 return c; 798} 799 800static int 801xgetc(int fn) 802{ 803 if (OPT_CHECK(RBX_NOINTR)) 804 return 0; 805 for (;;) { 806 if (ioctrl & IO_KEYBOARD && getc(1)) 807 return fn ? 1 : getc(0); 808 if (ioctrl & IO_SERIAL && sio_ischar()) 809 return fn ? 1 : sio_getc(); 810 if (fn) 811 return 0; 812 } 813} 814 815static int 816getc(int fn) 817{ 818 v86.addr = 0x18; 819 v86.eax = fn << 8; 820 v86int(); 821 if (fn) 822 return (v86.ebx >> 8) & 0x01; 823 else 824 return v86.eax & 0xff; 825} 826