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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
1.1.1.3 ! root 13: #include "blockcmd.h" // CDB_CMD_REQUEST_SENSE
1.1 root 14:
15:
16: /****************************************************************
17: * CD emulation
18: ****************************************************************/
19:
1.1.1.3 ! root 20: struct drive_s *cdemu_drive_gf VAR16VISIBLE;
! 21: u8 *cdemu_buf_fl VAR16VISIBLE;
! 22:
1.1 root 23: static int
24: cdemu_read(struct disk_op_s *op)
25: {
26: u16 ebda_seg = get_ebda_seg();
1.1.1.3 ! root 27: struct drive_s *drive_g;
! 28: drive_g = GLOBALFLAT2GLOBAL(GET_EBDA2(ebda_seg, cdemu.emulated_drive_gf));
1.1 root 29: struct disk_op_s dop;
30: dop.drive_g = drive_g;
31: dop.command = op->command;
32: dop.lba = GET_EBDA2(ebda_seg, cdemu.ilba) + op->lba / 4;
33:
34: int count = op->count;
35: op->count = 0;
1.1.1.3 ! root 36: u8 *cdbuf_fl = GET_GLOBAL(cdemu_buf_fl);
1.1 root 37:
38: if (op->lba & 3) {
39: // Partial read of first block.
40: dop.count = 1;
1.1.1.3 ! root 41: dop.buf_fl = cdbuf_fl;
1.1 root 42: int ret = process_op(&dop);
43: if (ret)
44: return ret;
45: u8 thiscount = 4 - (op->lba & 3);
46: if (thiscount > count)
47: thiscount = count;
48: count -= thiscount;
1.1.1.3 ! root 49: memcpy_fl(op->buf_fl, cdbuf_fl + (op->lba & 3) * 512, thiscount * 512);
1.1 root 50: op->buf_fl += thiscount * 512;
51: op->count += thiscount;
52: dop.lba++;
53: }
54:
55: if (count > 3) {
56: // Read n number of regular blocks.
57: dop.count = count / 4;
58: dop.buf_fl = op->buf_fl;
59: int ret = process_op(&dop);
60: op->count += dop.count * 4;
61: if (ret)
62: return ret;
63: u8 thiscount = count & ~3;
64: count &= 3;
65: op->buf_fl += thiscount * 512;
66: dop.lba += thiscount / 4;
67: }
68:
69: if (count) {
70: // Partial read on last block.
71: dop.count = 1;
1.1.1.3 ! root 72: dop.buf_fl = cdbuf_fl;
1.1 root 73: int ret = process_op(&dop);
74: if (ret)
75: return ret;
76: u8 thiscount = count;
1.1.1.3 ! root 77: memcpy_fl(op->buf_fl, cdbuf_fl, thiscount * 512);
1.1 root 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: void
1.1.1.2 root 108: cdemu_setup(void)
1.1 root 109: {
110: if (!CONFIG_CDROM_EMU)
111: return;
1.1.1.3 ! root 112: cdemu_drive_gf = NULL;
! 113: cdemu_buf_fl = NULL;
! 114: if (!Drives.cdcount)
! 115: return;
1.1 root 116:
1.1.1.3 ! root 117: struct drive_s *drive_g = malloc_fseg(sizeof(*drive_g));
! 118: u8 *buf = malloc_low(CDROM_SECTOR_SIZE);
! 119: if (!drive_g || !buf) {
! 120: warn_noalloc();
! 121: free(drive_g);
! 122: free(buf);
1.1 root 123: return;
124: }
1.1.1.3 ! root 125: cdemu_drive_gf = drive_g;
! 126: cdemu_buf_fl = buf;
! 127: memset(drive_g, 0, sizeof(*drive_g));
1.1 root 128: drive_g->type = DTYPE_CDEMU;
129: drive_g->blksize = DISK_SECTOR_SIZE;
130: drive_g->sectors = (u64)-1;
131: }
132:
133: struct eltorito_s {
134: u8 size;
135: u8 media;
136: u8 emulated_drive;
137: u8 controller_index;
138: u32 ilba;
139: u16 device_spec;
140: u16 buffer_segment;
141: u16 load_segment;
142: u16 sector_count;
143: u8 cylinders;
144: u8 sectors;
145: u8 heads;
146: };
147:
148: #define SET_INT13ET(regs,var,val) \
149: SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
150:
151: // ElTorito - Terminate disk emu
152: void
153: cdemu_134b(struct bregs *regs)
154: {
155: // FIXME ElTorito Hardcoded
156: u16 ebda_seg = get_ebda_seg();
157: SET_INT13ET(regs, size, 0x13);
158: SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media));
159: SET_INT13ET(regs, emulated_drive
160: , GET_EBDA2(ebda_seg, cdemu.emulated_extdrive));
1.1.1.3 ! root 161: struct drive_s *drive_gf = GET_EBDA2(ebda_seg, cdemu.emulated_drive_gf);
! 162: u8 cntl_id = 0;
! 163: if (drive_gf)
! 164: cntl_id = GET_GLOBALFLAT(drive_gf->cntl_id);
1.1 root 165: SET_INT13ET(regs, controller_index, cntl_id / 2);
166: SET_INT13ET(regs, device_spec, cntl_id % 2);
167: SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba));
168: SET_INT13ET(regs, buffer_segment, GET_EBDA2(ebda_seg, cdemu.buffer_segment));
169: SET_INT13ET(regs, load_segment, GET_EBDA2(ebda_seg, cdemu.load_segment));
170: SET_INT13ET(regs, sector_count, GET_EBDA2(ebda_seg, cdemu.sector_count));
171: SET_INT13ET(regs, cylinders, GET_EBDA2(ebda_seg, cdemu.lchs.cylinders));
172: SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.lchs.spt));
173: SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.lchs.heads));
174:
175: // If we have to terminate emulation
176: if (regs->al == 0x00) {
177: // FIXME ElTorito Various. Should be handled accordingly to spec
178: SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye
1.1.1.3 ! root 179:
! 180: // XXX - update floppy/hd count.
1.1 root 181: }
182:
183: disk_ret(regs, DISK_RET_SUCCESS);
184: }
185:
186:
187: /****************************************************************
188: * CD booting
189: ****************************************************************/
190:
191: static int
1.1.1.3 ! root 192: atapi_is_ready(struct disk_op_s *op)
1.1 root 193: {
1.1.1.3 ! root 194: dprintf(6, "atapi_is_ready (drive=%p)\n", op->drive_g);
1.1 root 195:
196: /* Retry READ CAPACITY for 5 seconds unless MEDIUM NOT PRESENT is
197: * reported by the device. If the device reports "IN PROGRESS",
198: * 30 seconds is added. */
1.1.1.3 ! root 199: struct cdbres_read_capacity info;
1.1 root 200: int in_progress = 0;
201: u64 end = calc_future_tsc(5000);
202: for (;;) {
1.1.1.3 ! root 203: if (check_tsc(end)) {
1.1 root 204: dprintf(1, "read capacity failed\n");
205: return -1;
206: }
207:
1.1.1.3 ! root 208: int ret = cdb_read_capacity(op, &info);
1.1 root 209: if (!ret)
210: // Success
211: break;
212:
1.1.1.3 ! root 213: struct cdbres_request_sense sense;
! 214: ret = cdb_get_sense(op, &sense);
1.1 root 215: if (ret)
216: // Error - retry.
217: continue;
218:
219: // Sense succeeded.
1.1.1.3 ! root 220: if (sense.asc == 0x3a) { /* MEDIUM NOT PRESENT */
1.1 root 221: dprintf(1, "Device reports MEDIUM NOT PRESENT\n");
222: return -1;
223: }
224:
1.1.1.3 ! root 225: if (sense.asc == 0x04 && sense.ascq == 0x01 && !in_progress) {
1.1 root 226: /* IN PROGRESS OF BECOMING READY */
227: printf("Waiting for device to detect medium... ");
228: /* Allow 30 seconds more */
229: end = calc_future_tsc(30000);
230: in_progress = 1;
231: }
232: }
233:
1.1.1.3 ! root 234: u32 blksize = ntohl(info.blksize), sectors = ntohl(info.sectors);
! 235: if (blksize != GET_GLOBAL(op->drive_g->blksize)) {
1.1 root 236: printf("Unsupported sector size %u\n", blksize);
237: return -1;
238: }
239:
240: dprintf(6, "sectors=%u\n", sectors);
241: printf("%dMB medium detected\n", sectors>>(20-11));
242: return 0;
243: }
244:
245: int
246: cdrom_boot(int cdid)
247: {
1.1.1.3 ! root 248: struct disk_op_s dop;
! 249: memset(&dop, 0, sizeof(dop));
! 250: dop.drive_g = getDrive(EXTTYPE_CD, cdid);
! 251: if (!dop.drive_g)
1.1 root 252: return 1;
253:
1.1.1.3 ! root 254: int ret = atapi_is_ready(&dop);
1.1 root 255: if (ret)
256: dprintf(1, "atapi_is_ready returned %d\n", ret);
257:
258: // Read the Boot Record Volume Descriptor
259: u8 buffer[2048];
260: dop.lba = 0x11;
261: dop.count = 1;
262: dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
1.1.1.3 ! root 263: ret = cdb_read(&dop);
1.1 root 264: if (ret)
265: return 3;
266:
267: // Validity checks
268: if (buffer[0])
269: return 4;
270: if (strcmp((char*)&buffer[1], "CD001\001EL TORITO SPECIFICATION") != 0)
271: return 5;
272:
273: // ok, now we calculate the Boot catalog address
274: u32 lba = *(u32*)&buffer[0x47];
275:
276: // And we read the Boot Catalog
277: dop.lba = lba;
1.1.1.3 ! root 278: dop.count = 1;
! 279: ret = cdb_read(&dop);
1.1 root 280: if (ret)
281: return 7;
282:
283: // Validation entry
284: if (buffer[0x00] != 0x01)
285: return 8; // Header
286: if (buffer[0x01] != 0x00)
287: return 9; // Platform
288: if (buffer[0x1E] != 0x55)
289: return 10; // key 1
290: if (buffer[0x1F] != 0xAA)
291: return 10; // key 2
292:
293: // Initial/Default Entry
294: if (buffer[0x20] != 0x88)
295: return 11; // Bootable
296:
297: u16 ebda_seg = get_ebda_seg();
298: u8 media = buffer[0x21];
299: SET_EBDA2(ebda_seg, cdemu.media, media);
300:
1.1.1.3 ! root 301: SET_EBDA2(ebda_seg, cdemu.emulated_drive_gf, dop.drive_g);
1.1 root 302:
303: u16 boot_segment = *(u16*)&buffer[0x22];
304: if (!boot_segment)
305: boot_segment = 0x07C0;
306: SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment);
307: SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000);
308:
309: u16 nbsectors = *(u16*)&buffer[0x26];
310: SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors);
311:
312: lba = *(u32*)&buffer[0x28];
313: SET_EBDA2(ebda_seg, cdemu.ilba, lba);
314:
315: // And we read the image in memory
316: dop.lba = lba;
317: dop.count = DIV_ROUND_UP(nbsectors, 4);
318: dop.buf_fl = MAKE_FLATPTR(boot_segment, 0);
1.1.1.3 ! root 319: ret = cdb_read(&dop);
1.1 root 320: if (ret)
321: return 12;
322:
323: if (media == 0) {
324: // No emulation requested - return success.
325: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, EXTSTART_CD + cdid);
326: return 0;
327: }
328:
329: // Emulation of a floppy/harddisk requested
1.1.1.3 ! root 330: if (! CONFIG_CDROM_EMU || !cdemu_drive_gf)
1.1 root 331: return 13;
332:
333: // Set emulated drive id and increase bios installed hardware
334: // number of devices
335: if (media < 4) {
336: // Floppy emulation
337: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, 0x00);
1.1.1.3 ! root 338: // XXX - get and set actual floppy count.
1.1 root 339: SETBITS_BDA(equipment_list_flags, 0x41);
340:
341: switch (media) {
342: case 0x01: // 1.2M floppy
343: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 15);
344: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
345: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
346: break;
347: case 0x02: // 1.44M floppy
348: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 18);
349: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
350: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
351: break;
352: case 0x03: // 2.88M floppy
353: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 36);
354: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
355: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
356: break;
357: }
358: } else {
359: // Harddrive emulation
360: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, 0x80);
361: SET_BDA(hdcount, GET_BDA(hdcount) + 1);
362:
363: // Peak at partition table to get chs.
364: struct mbr_s *mbr = (void*)0;
365: u8 sptcyl = GET_FARVAR(boot_segment, mbr->partitions[0].last.sptcyl);
366: u8 cyllow = GET_FARVAR(boot_segment, mbr->partitions[0].last.cyllow);
367: u8 heads = GET_FARVAR(boot_segment, mbr->partitions[0].last.heads);
368:
369: SET_EBDA2(ebda_seg, cdemu.lchs.spt, sptcyl & 0x3f);
370: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders
371: , ((sptcyl<<2)&0x300) + cyllow + 1);
372: SET_EBDA2(ebda_seg, cdemu.lchs.heads, heads + 1);
373: }
374:
375: // everything is ok, so from now on, the emulation is active
376: SET_EBDA2(ebda_seg, cdemu.active, 0x01);
377: dprintf(6, "cdemu media=%d\n", media);
378:
379: return 0;
380: }
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