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1.1 ! root 1: // Support for booting from cdroms (the "El Torito" spec). ! 2: // ! 3: // Copyright (C) 2008,2009 Kevin O'Connor <[email protected]> ! 4: // Copyright (C) 2002 MandrakeSoft S.A. ! 5: // ! 6: // This file may be distributed under the terms of the GNU LGPLv3 license. ! 7: ! 8: #include "disk.h" // cdrom_13 ! 9: #include "util.h" // memset ! 10: #include "bregs.h" // struct bregs ! 11: #include "biosvar.h" // GET_EBDA ! 12: #include "ata.h" // ATA_CMD_REQUEST_SENSE ! 13: ! 14: ! 15: /**************************************************************** ! 16: * CD emulation ! 17: ****************************************************************/ ! 18: ! 19: static int ! 20: cdemu_read(struct disk_op_s *op) ! 21: { ! 22: u16 ebda_seg = get_ebda_seg(); ! 23: struct drive_s *drive_g = GET_EBDA2(ebda_seg, cdemu.emulated_drive); ! 24: struct disk_op_s dop; ! 25: dop.drive_g = drive_g; ! 26: dop.command = op->command; ! 27: dop.lba = GET_EBDA2(ebda_seg, cdemu.ilba) + op->lba / 4; ! 28: ! 29: int count = op->count; ! 30: op->count = 0; ! 31: u8 *cdbuf_far = (void*)offsetof(struct extended_bios_data_area_s, cdemu_buf); ! 32: ! 33: if (op->lba & 3) { ! 34: // Partial read of first block. ! 35: dop.count = 1; ! 36: dop.buf_fl = MAKE_FLATPTR(ebda_seg, cdbuf_far); ! 37: int ret = process_op(&dop); ! 38: if (ret) ! 39: return ret; ! 40: u8 thiscount = 4 - (op->lba & 3); ! 41: if (thiscount > count) ! 42: thiscount = count; ! 43: count -= thiscount; ! 44: memcpy_far(FLATPTR_TO_SEG(op->buf_fl) ! 45: , (void*)FLATPTR_TO_OFFSET(op->buf_fl) ! 46: , ebda_seg, cdbuf_far + (op->lba & 3) * 512 ! 47: , thiscount * 512); ! 48: op->buf_fl += thiscount * 512; ! 49: op->count += thiscount; ! 50: dop.lba++; ! 51: } ! 52: ! 53: if (count > 3) { ! 54: // Read n number of regular blocks. ! 55: dop.count = count / 4; ! 56: dop.buf_fl = op->buf_fl; ! 57: int ret = process_op(&dop); ! 58: op->count += dop.count * 4; ! 59: if (ret) ! 60: return ret; ! 61: u8 thiscount = count & ~3; ! 62: count &= 3; ! 63: op->buf_fl += thiscount * 512; ! 64: dop.lba += thiscount / 4; ! 65: } ! 66: ! 67: if (count) { ! 68: // Partial read on last block. ! 69: dop.count = 1; ! 70: dop.buf_fl = MAKE_FLATPTR(ebda_seg, cdbuf_far); ! 71: int ret = process_op(&dop); ! 72: if (ret) ! 73: return ret; ! 74: u8 thiscount = count; ! 75: memcpy_far(FLATPTR_TO_SEG(op->buf_fl) ! 76: , (void*)FLATPTR_TO_OFFSET(op->buf_fl) ! 77: , ebda_seg, cdbuf_far, thiscount * 512); ! 78: op->count += thiscount; ! 79: } ! 80: ! 81: return DISK_RET_SUCCESS; ! 82: } ! 83: ! 84: int ! 85: process_cdemu_op(struct disk_op_s *op) ! 86: { ! 87: if (!CONFIG_CDROM_EMU) ! 88: return 0; ! 89: ! 90: switch (op->command) { ! 91: case CMD_READ: ! 92: return cdemu_read(op); ! 93: case CMD_WRITE: ! 94: case CMD_FORMAT: ! 95: return DISK_RET_EWRITEPROTECT; ! 96: case CMD_VERIFY: ! 97: case CMD_RESET: ! 98: case CMD_SEEK: ! 99: case CMD_ISREADY: ! 100: return DISK_RET_SUCCESS; ! 101: default: ! 102: op->count = 0; ! 103: return DISK_RET_EPARAM; ! 104: } ! 105: } ! 106: ! 107: struct drive_s *cdemu_drive VAR16VISIBLE; ! 108: ! 109: void ! 110: cdemu_setup() ! 111: { ! 112: if (!CONFIG_CDROM_EMU) ! 113: return; ! 114: ! 115: struct drive_s *drive_g = allocDrive(); ! 116: if (!drive_g) { ! 117: cdemu_drive = NULL; ! 118: return; ! 119: } ! 120: cdemu_drive = ADJUST_GLOBAL_PTR(drive_g); ! 121: drive_g->type = DTYPE_CDEMU; ! 122: drive_g->blksize = DISK_SECTOR_SIZE; ! 123: drive_g->sectors = (u64)-1; ! 124: } ! 125: ! 126: struct eltorito_s { ! 127: u8 size; ! 128: u8 media; ! 129: u8 emulated_drive; ! 130: u8 controller_index; ! 131: u32 ilba; ! 132: u16 device_spec; ! 133: u16 buffer_segment; ! 134: u16 load_segment; ! 135: u16 sector_count; ! 136: u8 cylinders; ! 137: u8 sectors; ! 138: u8 heads; ! 139: }; ! 140: ! 141: #define SET_INT13ET(regs,var,val) \ ! 142: SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val)) ! 143: ! 144: // ElTorito - Terminate disk emu ! 145: void ! 146: cdemu_134b(struct bregs *regs) ! 147: { ! 148: // FIXME ElTorito Hardcoded ! 149: u16 ebda_seg = get_ebda_seg(); ! 150: SET_INT13ET(regs, size, 0x13); ! 151: SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media)); ! 152: SET_INT13ET(regs, emulated_drive ! 153: , GET_EBDA2(ebda_seg, cdemu.emulated_extdrive)); ! 154: struct drive_s *drive_g = GET_EBDA2(ebda_seg, cdemu.emulated_drive); ! 155: u8 cntl_id = GET_GLOBAL(drive_g->cntl_id); ! 156: SET_INT13ET(regs, controller_index, cntl_id / 2); ! 157: SET_INT13ET(regs, device_spec, cntl_id % 2); ! 158: SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba)); ! 159: SET_INT13ET(regs, buffer_segment, GET_EBDA2(ebda_seg, cdemu.buffer_segment)); ! 160: SET_INT13ET(regs, load_segment, GET_EBDA2(ebda_seg, cdemu.load_segment)); ! 161: SET_INT13ET(regs, sector_count, GET_EBDA2(ebda_seg, cdemu.sector_count)); ! 162: SET_INT13ET(regs, cylinders, GET_EBDA2(ebda_seg, cdemu.lchs.cylinders)); ! 163: SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.lchs.spt)); ! 164: SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.lchs.heads)); ! 165: ! 166: // If we have to terminate emulation ! 167: if (regs->al == 0x00) { ! 168: // FIXME ElTorito Various. Should be handled accordingly to spec ! 169: SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye ! 170: } ! 171: ! 172: disk_ret(regs, DISK_RET_SUCCESS); ! 173: } ! 174: ! 175: ! 176: /**************************************************************** ! 177: * CD booting ! 178: ****************************************************************/ ! 179: ! 180: // Request SENSE ! 181: static int ! 182: atapi_get_sense(struct drive_s *drive_g, u8 *asc, u8 *ascq) ! 183: { ! 184: u8 atacmd[12], buffer[18]; ! 185: memset(atacmd, 0, sizeof(atacmd)); ! 186: atacmd[0] = ATA_CMD_REQUEST_SENSE; ! 187: atacmd[4] = sizeof(buffer); ! 188: int ret = ata_cmd_packet(drive_g, atacmd, sizeof(atacmd), sizeof(buffer) ! 189: , MAKE_FLATPTR(GET_SEG(SS), buffer)); ! 190: if (ret) ! 191: return ret; ! 192: ! 193: *asc = buffer[12]; ! 194: *ascq = buffer[13]; ! 195: ! 196: return 0; ! 197: } ! 198: ! 199: // Request capacity ! 200: static int ! 201: atapi_read_capacity(struct drive_s *drive_g, u32 *blksize, u32 *sectors) ! 202: { ! 203: u8 packet[12], buf[8]; ! 204: memset(packet, 0, sizeof(packet)); ! 205: packet[0] = 0x25; /* READ CAPACITY */ ! 206: int ret = ata_cmd_packet(drive_g, packet, sizeof(packet), sizeof(buf) ! 207: , MAKE_FLATPTR(GET_SEG(SS), buf)); ! 208: if (ret) ! 209: return ret; ! 210: ! 211: *blksize = (((u32)buf[4] << 24) | ((u32)buf[5] << 16) ! 212: | ((u32)buf[6] << 8) | ((u32)buf[7] << 0)); ! 213: *sectors = (((u32)buf[0] << 24) | ((u32)buf[1] << 16) ! 214: | ((u32)buf[2] << 8) | ((u32)buf[3] << 0)); ! 215: ! 216: return 0; ! 217: } ! 218: ! 219: static int ! 220: atapi_is_ready(struct drive_s *drive_g) ! 221: { ! 222: dprintf(6, "atapi_is_ready (drive=%p)\n", drive_g); ! 223: ! 224: /* Retry READ CAPACITY for 5 seconds unless MEDIUM NOT PRESENT is ! 225: * reported by the device. If the device reports "IN PROGRESS", ! 226: * 30 seconds is added. */ ! 227: u32 blksize, sectors; ! 228: int in_progress = 0; ! 229: u64 end = calc_future_tsc(5000); ! 230: for (;;) { ! 231: if (check_time(end)) { ! 232: dprintf(1, "read capacity failed\n"); ! 233: return -1; ! 234: } ! 235: ! 236: int ret = atapi_read_capacity(drive_g, &blksize, §ors); ! 237: if (!ret) ! 238: // Success ! 239: break; ! 240: ! 241: u8 asc, ascq; ! 242: ret = atapi_get_sense(drive_g, &asc, &ascq); ! 243: if (ret) ! 244: // Error - retry. ! 245: continue; ! 246: ! 247: // Sense succeeded. ! 248: if (asc == 0x3a) { /* MEDIUM NOT PRESENT */ ! 249: dprintf(1, "Device reports MEDIUM NOT PRESENT\n"); ! 250: return -1; ! 251: } ! 252: ! 253: if (asc == 0x04 && ascq == 0x01 && !in_progress) { ! 254: /* IN PROGRESS OF BECOMING READY */ ! 255: printf("Waiting for device to detect medium... "); ! 256: /* Allow 30 seconds more */ ! 257: end = calc_future_tsc(30000); ! 258: in_progress = 1; ! 259: } ! 260: } ! 261: ! 262: if (blksize != GET_GLOBAL(drive_g->blksize)) { ! 263: printf("Unsupported sector size %u\n", blksize); ! 264: return -1; ! 265: } ! 266: ! 267: dprintf(6, "sectors=%u\n", sectors); ! 268: printf("%dMB medium detected\n", sectors>>(20-11)); ! 269: return 0; ! 270: } ! 271: ! 272: int ! 273: cdrom_boot(int cdid) ! 274: { ! 275: struct drive_s *drive_g = getDrive(EXTTYPE_CD, cdid); ! 276: if (!drive_g) ! 277: return 1; ! 278: ! 279: int ret = atapi_is_ready(drive_g); ! 280: if (ret) ! 281: dprintf(1, "atapi_is_ready returned %d\n", ret); ! 282: ! 283: // Read the Boot Record Volume Descriptor ! 284: u8 buffer[2048]; ! 285: struct disk_op_s dop; ! 286: memset(&dop, 0, sizeof(dop)); ! 287: dop.drive_g = drive_g; ! 288: dop.lba = 0x11; ! 289: dop.count = 1; ! 290: dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer); ! 291: ret = cdrom_read(&dop); ! 292: if (ret) ! 293: return 3; ! 294: ! 295: // Validity checks ! 296: if (buffer[0]) ! 297: return 4; ! 298: if (strcmp((char*)&buffer[1], "CD001\001EL TORITO SPECIFICATION") != 0) ! 299: return 5; ! 300: ! 301: // ok, now we calculate the Boot catalog address ! 302: u32 lba = *(u32*)&buffer[0x47]; ! 303: ! 304: // And we read the Boot Catalog ! 305: dop.lba = lba; ! 306: ret = cdrom_read(&dop); ! 307: if (ret) ! 308: return 7; ! 309: ! 310: // Validation entry ! 311: if (buffer[0x00] != 0x01) ! 312: return 8; // Header ! 313: if (buffer[0x01] != 0x00) ! 314: return 9; // Platform ! 315: if (buffer[0x1E] != 0x55) ! 316: return 10; // key 1 ! 317: if (buffer[0x1F] != 0xAA) ! 318: return 10; // key 2 ! 319: ! 320: // Initial/Default Entry ! 321: if (buffer[0x20] != 0x88) ! 322: return 11; // Bootable ! 323: ! 324: u16 ebda_seg = get_ebda_seg(); ! 325: u8 media = buffer[0x21]; ! 326: SET_EBDA2(ebda_seg, cdemu.media, media); ! 327: ! 328: SET_EBDA2(ebda_seg, cdemu.emulated_drive, ADJUST_GLOBAL_PTR(drive_g)); ! 329: ! 330: u16 boot_segment = *(u16*)&buffer[0x22]; ! 331: if (!boot_segment) ! 332: boot_segment = 0x07C0; ! 333: SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment); ! 334: SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000); ! 335: ! 336: u16 nbsectors = *(u16*)&buffer[0x26]; ! 337: SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors); ! 338: ! 339: lba = *(u32*)&buffer[0x28]; ! 340: SET_EBDA2(ebda_seg, cdemu.ilba, lba); ! 341: ! 342: // And we read the image in memory ! 343: dop.lba = lba; ! 344: dop.count = DIV_ROUND_UP(nbsectors, 4); ! 345: dop.buf_fl = MAKE_FLATPTR(boot_segment, 0); ! 346: ret = cdrom_read(&dop); ! 347: if (ret) ! 348: return 12; ! 349: ! 350: if (media == 0) { ! 351: // No emulation requested - return success. ! 352: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, EXTSTART_CD + cdid); ! 353: return 0; ! 354: } ! 355: ! 356: // Emulation of a floppy/harddisk requested ! 357: if (! CONFIG_CDROM_EMU || !cdemu_drive) ! 358: return 13; ! 359: ! 360: // Set emulated drive id and increase bios installed hardware ! 361: // number of devices ! 362: if (media < 4) { ! 363: // Floppy emulation ! 364: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, 0x00); ! 365: SETBITS_BDA(equipment_list_flags, 0x41); ! 366: ! 367: switch (media) { ! 368: case 0x01: // 1.2M floppy ! 369: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 15); ! 370: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80); ! 371: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2); ! 372: break; ! 373: case 0x02: // 1.44M floppy ! 374: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 18); ! 375: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80); ! 376: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2); ! 377: break; ! 378: case 0x03: // 2.88M floppy ! 379: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 36); ! 380: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80); ! 381: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2); ! 382: break; ! 383: } ! 384: } else { ! 385: // Harddrive emulation ! 386: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, 0x80); ! 387: SET_BDA(hdcount, GET_BDA(hdcount) + 1); ! 388: ! 389: // Peak at partition table to get chs. ! 390: struct mbr_s *mbr = (void*)0; ! 391: u8 sptcyl = GET_FARVAR(boot_segment, mbr->partitions[0].last.sptcyl); ! 392: u8 cyllow = GET_FARVAR(boot_segment, mbr->partitions[0].last.cyllow); ! 393: u8 heads = GET_FARVAR(boot_segment, mbr->partitions[0].last.heads); ! 394: ! 395: SET_EBDA2(ebda_seg, cdemu.lchs.spt, sptcyl & 0x3f); ! 396: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders ! 397: , ((sptcyl<<2)&0x300) + cyllow + 1); ! 398: SET_EBDA2(ebda_seg, cdemu.lchs.heads, heads + 1); ! 399: } ! 400: ! 401: // everything is ok, so from now on, the emulation is active ! 402: SET_EBDA2(ebda_seg, cdemu.active, 0x01); ! 403: dprintf(6, "cdemu media=%d\n", media); ! 404: ! 405: return 0; ! 406: }
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