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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:
1.1 root 22: static int
23: cdemu_read(struct disk_op_s *op)
24: {
25: u16 ebda_seg = get_ebda_seg();
1.1.1.3 root 26: struct drive_s *drive_g;
27: drive_g = GLOBALFLAT2GLOBAL(GET_EBDA2(ebda_seg, cdemu.emulated_drive_gf));
1.1 root 28: struct disk_op_s dop;
29: dop.drive_g = drive_g;
30: dop.command = op->command;
31: dop.lba = GET_EBDA2(ebda_seg, cdemu.ilba) + op->lba / 4;
32:
33: int count = op->count;
34: op->count = 0;
1.1.1.5 root 35: u8 *cdbuf_fl = GET_GLOBAL(bounce_buf_fl);
1.1 root 36:
37: if (op->lba & 3) {
38: // Partial read of first block.
39: dop.count = 1;
1.1.1.3 root 40: dop.buf_fl = cdbuf_fl;
1.1 root 41: int ret = process_op(&dop);
42: if (ret)
43: return ret;
44: u8 thiscount = 4 - (op->lba & 3);
45: if (thiscount > count)
46: thiscount = count;
47: count -= thiscount;
1.1.1.3 root 48: memcpy_fl(op->buf_fl, cdbuf_fl + (op->lba & 3) * 512, thiscount * 512);
1.1 root 49: op->buf_fl += thiscount * 512;
50: op->count += thiscount;
51: dop.lba++;
52: }
53:
54: if (count > 3) {
55: // Read n number of regular blocks.
56: dop.count = count / 4;
57: dop.buf_fl = op->buf_fl;
58: int ret = process_op(&dop);
59: op->count += dop.count * 4;
60: if (ret)
61: return ret;
62: u8 thiscount = count & ~3;
63: count &= 3;
64: op->buf_fl += thiscount * 512;
65: dop.lba += thiscount / 4;
66: }
67:
68: if (count) {
69: // Partial read on last block.
70: dop.count = 1;
1.1.1.3 root 71: dop.buf_fl = cdbuf_fl;
1.1 root 72: int ret = process_op(&dop);
73: if (ret)
74: return ret;
75: u8 thiscount = count;
1.1.1.3 root 76: memcpy_fl(op->buf_fl, cdbuf_fl, thiscount * 512);
1.1 root 77: op->count += thiscount;
78: }
79:
80: return DISK_RET_SUCCESS;
81: }
82:
83: int
84: process_cdemu_op(struct disk_op_s *op)
85: {
86: if (!CONFIG_CDROM_EMU)
87: return 0;
88:
89: switch (op->command) {
90: case CMD_READ:
91: return cdemu_read(op);
92: case CMD_WRITE:
93: case CMD_FORMAT:
94: return DISK_RET_EWRITEPROTECT;
95: case CMD_VERIFY:
96: case CMD_RESET:
97: case CMD_SEEK:
98: case CMD_ISREADY:
99: return DISK_RET_SUCCESS;
100: default:
101: op->count = 0;
102: return DISK_RET_EPARAM;
103: }
104: }
105:
106: void
1.1.1.2 root 107: cdemu_setup(void)
1.1 root 108: {
109: if (!CONFIG_CDROM_EMU)
110: return;
1.1.1.4 root 111: if (!CDCount)
1.1.1.3 root 112: return;
1.1.1.5 root 113: if (bounce_buf_init() < 0)
114: return;
1.1 root 115:
1.1.1.3 root 116: struct drive_s *drive_g = malloc_fseg(sizeof(*drive_g));
1.1.1.5 root 117: if (!drive_g) {
1.1.1.3 root 118: warn_noalloc();
119: free(drive_g);
1.1 root 120: return;
121: }
1.1.1.3 root 122: cdemu_drive_gf = drive_g;
123: memset(drive_g, 0, sizeof(*drive_g));
1.1 root 124: drive_g->type = DTYPE_CDEMU;
125: drive_g->blksize = DISK_SECTOR_SIZE;
126: drive_g->sectors = (u64)-1;
127: }
128:
129: struct eltorito_s {
130: u8 size;
131: u8 media;
132: u8 emulated_drive;
133: u8 controller_index;
134: u32 ilba;
135: u16 device_spec;
136: u16 buffer_segment;
137: u16 load_segment;
138: u16 sector_count;
139: u8 cylinders;
140: u8 sectors;
141: u8 heads;
142: };
143:
144: #define SET_INT13ET(regs,var,val) \
145: SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
146:
147: // ElTorito - Terminate disk emu
148: void
149: cdemu_134b(struct bregs *regs)
150: {
151: // FIXME ElTorito Hardcoded
152: u16 ebda_seg = get_ebda_seg();
153: SET_INT13ET(regs, size, 0x13);
154: SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media));
155: SET_INT13ET(regs, emulated_drive
156: , GET_EBDA2(ebda_seg, cdemu.emulated_extdrive));
1.1.1.3 root 157: struct drive_s *drive_gf = GET_EBDA2(ebda_seg, cdemu.emulated_drive_gf);
158: u8 cntl_id = 0;
159: if (drive_gf)
160: cntl_id = GET_GLOBALFLAT(drive_gf->cntl_id);
1.1 root 161: SET_INT13ET(regs, controller_index, cntl_id / 2);
162: SET_INT13ET(regs, device_spec, cntl_id % 2);
163: SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba));
164: SET_INT13ET(regs, buffer_segment, GET_EBDA2(ebda_seg, cdemu.buffer_segment));
165: SET_INT13ET(regs, load_segment, GET_EBDA2(ebda_seg, cdemu.load_segment));
166: SET_INT13ET(regs, sector_count, GET_EBDA2(ebda_seg, cdemu.sector_count));
167: SET_INT13ET(regs, cylinders, GET_EBDA2(ebda_seg, cdemu.lchs.cylinders));
168: SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.lchs.spt));
169: SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.lchs.heads));
170:
171: // If we have to terminate emulation
172: if (regs->al == 0x00) {
173: // FIXME ElTorito Various. Should be handled accordingly to spec
174: SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye
1.1.1.3 root 175:
176: // XXX - update floppy/hd count.
1.1 root 177: }
178:
179: disk_ret(regs, DISK_RET_SUCCESS);
180: }
181:
182:
183: /****************************************************************
184: * CD booting
185: ****************************************************************/
186:
187: int
1.1.1.4 root 188: cdrom_boot(struct drive_s *drive_g)
1.1 root 189: {
1.1.1.3 root 190: struct disk_op_s dop;
1.1.1.4 root 191: int cdid = getDriveId(EXTTYPE_CD, drive_g);
1.1.1.3 root 192: memset(&dop, 0, sizeof(dop));
1.1.1.4 root 193: dop.drive_g = drive_g;
194: if (!dop.drive_g || cdid < 0)
1.1 root 195: return 1;
196:
1.1.1.6 ! root 197: int ret = scsi_is_ready(&dop);
1.1 root 198: if (ret)
1.1.1.6 ! root 199: dprintf(1, "scsi_is_ready returned %d\n", ret);
1.1 root 200:
201: // Read the Boot Record Volume Descriptor
202: u8 buffer[2048];
203: dop.lba = 0x11;
204: dop.count = 1;
205: dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
1.1.1.3 root 206: ret = cdb_read(&dop);
1.1 root 207: if (ret)
208: return 3;
209:
210: // Validity checks
211: if (buffer[0])
212: return 4;
213: if (strcmp((char*)&buffer[1], "CD001\001EL TORITO SPECIFICATION") != 0)
214: return 5;
215:
216: // ok, now we calculate the Boot catalog address
217: u32 lba = *(u32*)&buffer[0x47];
218:
219: // And we read the Boot Catalog
220: dop.lba = lba;
1.1.1.3 root 221: dop.count = 1;
222: ret = cdb_read(&dop);
1.1 root 223: if (ret)
224: return 7;
225:
226: // Validation entry
227: if (buffer[0x00] != 0x01)
228: return 8; // Header
229: if (buffer[0x01] != 0x00)
230: return 9; // Platform
231: if (buffer[0x1E] != 0x55)
232: return 10; // key 1
233: if (buffer[0x1F] != 0xAA)
234: return 10; // key 2
235:
236: // Initial/Default Entry
237: if (buffer[0x20] != 0x88)
238: return 11; // Bootable
239:
240: u16 ebda_seg = get_ebda_seg();
241: u8 media = buffer[0x21];
242: SET_EBDA2(ebda_seg, cdemu.media, media);
243:
1.1.1.3 root 244: SET_EBDA2(ebda_seg, cdemu.emulated_drive_gf, dop.drive_g);
1.1 root 245:
246: u16 boot_segment = *(u16*)&buffer[0x22];
247: if (!boot_segment)
248: boot_segment = 0x07C0;
249: SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment);
250: SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000);
251:
252: u16 nbsectors = *(u16*)&buffer[0x26];
253: SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors);
254:
255: lba = *(u32*)&buffer[0x28];
256: SET_EBDA2(ebda_seg, cdemu.ilba, lba);
257:
258: // And we read the image in memory
259: dop.lba = lba;
260: dop.count = DIV_ROUND_UP(nbsectors, 4);
261: dop.buf_fl = MAKE_FLATPTR(boot_segment, 0);
1.1.1.3 root 262: ret = cdb_read(&dop);
1.1 root 263: if (ret)
264: return 12;
265:
266: if (media == 0) {
267: // No emulation requested - return success.
268: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, EXTSTART_CD + cdid);
269: return 0;
270: }
271:
272: // Emulation of a floppy/harddisk requested
1.1.1.3 root 273: if (! CONFIG_CDROM_EMU || !cdemu_drive_gf)
1.1 root 274: return 13;
275:
276: // Set emulated drive id and increase bios installed hardware
277: // number of devices
278: if (media < 4) {
279: // Floppy emulation
280: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, 0x00);
1.1.1.3 root 281: // XXX - get and set actual floppy count.
1.1 root 282: SETBITS_BDA(equipment_list_flags, 0x41);
283:
284: switch (media) {
285: case 0x01: // 1.2M floppy
286: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 15);
287: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
288: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
289: break;
290: case 0x02: // 1.44M floppy
291: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 18);
292: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
293: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
294: break;
295: case 0x03: // 2.88M floppy
296: SET_EBDA2(ebda_seg, cdemu.lchs.spt, 36);
297: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
298: SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
299: break;
300: }
301: } else {
302: // Harddrive emulation
303: SET_EBDA2(ebda_seg, cdemu.emulated_extdrive, 0x80);
304: SET_BDA(hdcount, GET_BDA(hdcount) + 1);
305:
306: // Peak at partition table to get chs.
307: struct mbr_s *mbr = (void*)0;
308: u8 sptcyl = GET_FARVAR(boot_segment, mbr->partitions[0].last.sptcyl);
309: u8 cyllow = GET_FARVAR(boot_segment, mbr->partitions[0].last.cyllow);
310: u8 heads = GET_FARVAR(boot_segment, mbr->partitions[0].last.heads);
311:
312: SET_EBDA2(ebda_seg, cdemu.lchs.spt, sptcyl & 0x3f);
313: SET_EBDA2(ebda_seg, cdemu.lchs.cylinders
314: , ((sptcyl<<2)&0x300) + cyllow + 1);
315: SET_EBDA2(ebda_seg, cdemu.lchs.heads, heads + 1);
316: }
317:
318: // everything is ok, so from now on, the emulation is active
319: SET_EBDA2(ebda_seg, cdemu.active, 0x01);
320: dprintf(6, "cdemu media=%d\n", media);
321:
322: return 0;
323: }
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