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