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1.1 root 1: // Disk setup and access
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" // struct ata_s
9: #include "biosvar.h" // GET_GLOBAL
10: #include "cmos.h" // inb_cmos
11: #include "util.h" // dprintf
12: #include "ata.h" // process_ata_op
13:
14: struct drives_s Drives VAR16VISIBLE;
15:
16: struct drive_s *
17: getDrive(u8 exttype, u8 extdriveoffset)
18: {
19: // basic check : device has to be defined
20: if (extdriveoffset >= ARRAY_SIZE(Drives.idmap[0]))
21: return NULL;
22:
23: // Get the ata channel
24: u8 driveid = GET_GLOBAL(Drives.idmap[exttype][extdriveoffset]);
25:
26: // basic check : device has to be valid
27: if (driveid >= ARRAY_SIZE(Drives.drives))
28: return NULL;
29:
30: return &Drives.drives[driveid];
31: }
32:
33: struct drive_s *
34: allocDrive()
35: {
36: int driveid = Drives.drivecount;
37: if (driveid >= ARRAY_SIZE(Drives.drives))
38: return NULL;
39: Drives.drivecount++;
40: struct drive_s *drive_g = &Drives.drives[driveid];
41: memset(drive_g, 0, sizeof(*drive_g));
42: return drive_g;
43: }
44:
45:
46: /****************************************************************
47: * Disk geometry translation
48: ****************************************************************/
49:
50: static u8
51: get_translation(struct drive_s *drive_g)
52: {
53: u8 type = GET_GLOBAL(drive_g->type);
54: if (! CONFIG_COREBOOT && type == DTYPE_ATA) {
55: // Emulators pass in the translation info via nvram.
56: u8 ataid = GET_GLOBAL(drive_g->cntl_id);
57: u8 channel = ataid / 2;
58: u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
59: translation >>= 2 * (ataid % 4);
60: translation &= 0x03;
61: return translation;
62: }
63:
64: // On COREBOOT, use a heuristic to determine translation type.
65: u16 heads = GET_GLOBAL(drive_g->pchs.heads);
66: u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
67: u16 spt = GET_GLOBAL(drive_g->pchs.spt);
68:
69: if (cylinders <= 1024 && heads <= 16 && spt <= 63)
70: return TRANSLATION_NONE;
71: if (cylinders * heads <= 131072)
72: return TRANSLATION_LARGE;
73: return TRANSLATION_LBA;
74: }
75:
76: void
77: setup_translation(struct drive_s *drive_g)
78: {
79: u8 translation = get_translation(drive_g);
80: SET_GLOBAL(drive_g->translation, translation);
81:
82: u8 ataid = GET_GLOBAL(drive_g->cntl_id);
83: u8 channel = ataid / 2;
84: u8 slave = ataid % 2;
85: u16 heads = GET_GLOBAL(drive_g->pchs.heads);
86: u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
87: u16 spt = GET_GLOBAL(drive_g->pchs.spt);
88: u64 sectors = GET_GLOBAL(drive_g->sectors);
89: const char *desc = NULL;
90:
91: switch (translation) {
92: default:
93: case TRANSLATION_NONE:
94: desc = "none";
95: break;
96: case TRANSLATION_LBA:
97: desc = "lba";
98: spt = 63;
99: if (sectors > 63*255*1024) {
100: heads = 255;
101: cylinders = 1024;
102: break;
103: }
104: u32 sect = (u32)sectors / 63;
105: heads = sect / 1024;
106: if (heads>128)
107: heads = 255;
108: else if (heads>64)
109: heads = 128;
110: else if (heads>32)
111: heads = 64;
112: else if (heads>16)
113: heads = 32;
114: else
115: heads = 16;
116: cylinders = sect / heads;
117: break;
118: case TRANSLATION_RECHS:
119: desc = "r-echs";
120: // Take care not to overflow
121: if (heads==16) {
122: if (cylinders>61439)
123: cylinders=61439;
124: heads=15;
125: cylinders = (u16)((u32)(cylinders)*16/15);
126: }
127: // then go through the large bitshift process
128: case TRANSLATION_LARGE:
129: if (translation == TRANSLATION_LARGE)
130: desc = "large";
131: while (cylinders > 1024) {
132: cylinders >>= 1;
133: heads <<= 1;
134:
135: // If we max out the head count
136: if (heads > 127)
137: break;
138: }
139: break;
140: }
141: // clip to 1024 cylinders in lchs
142: if (cylinders > 1024)
143: cylinders = 1024;
144: dprintf(1, "ata%d-%d: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d\n"
145: , channel, slave
146: , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
147: , desc
148: , cylinders, heads, spt);
149:
150: SET_GLOBAL(drive_g->lchs.heads, heads);
151: SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
152: SET_GLOBAL(drive_g->lchs.spt, spt);
153: }
154:
155:
156: /****************************************************************
157: * Drive mapping
158: ****************************************************************/
159:
160: // Fill in Fixed Disk Parameter Table (located in ebda).
161: static void
162: fill_fdpt(struct drive_s *drive_g, int hdid)
163: {
164: if (hdid > 1)
165: return;
166:
167: u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
168: u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
169: u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
170:
171: u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
172: u16 nph = GET_GLOBAL(drive_g->pchs.heads);
173: u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
174:
175: struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
176: fdpt->precompensation = 0xffff;
177: fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
178: fdpt->landing_zone = npc;
179: fdpt->cylinders = nlc;
180: fdpt->heads = nlh;
181: fdpt->sectors = nlspt;
182:
183: if (nlc == npc && nlh == nph && nlspt == npspt)
184: // no logical CHS mapping used, just physical CHS
185: // use Standard Fixed Disk Parameter Table (FDPT)
186: return;
187:
188: // complies with Phoenix style Translated Fixed Disk Parameter
189: // Table (FDPT)
190: fdpt->phys_cylinders = npc;
191: fdpt->phys_heads = nph;
192: fdpt->phys_sectors = npspt;
193: fdpt->a0h_signature = 0xa0;
194:
195: // Checksum structure.
196: fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
197:
198: if (hdid == 0)
199: SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
200: struct extended_bios_data_area_s, fdpt[0])));
201: else
202: SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
203: struct extended_bios_data_area_s, fdpt[1])));
204: }
205:
206: // Map a drive (that was registered via add_bcv_hd)
207: void
208: map_hd_drive(struct drive_s *drive_g)
209: {
210: // fill hdidmap
211: u8 hdcount = GET_BDA(hdcount);
212: if (hdcount >= ARRAY_SIZE(Drives.idmap[0]))
213: return;
214: dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdcount);
215: int driveid = drive_g - Drives.drives;
216: SET_GLOBAL(Drives.idmap[EXTTYPE_HD][hdcount], driveid);
217: SET_BDA(hdcount, hdcount + 1);
218:
219: // Fill "fdpt" structure.
220: fill_fdpt(drive_g, hdcount);
221: }
222:
223: // Find spot to add a drive
224: static void
225: add_ordered_drive(u8 *idmap, u8 *count, struct drive_s *drive_g)
226: {
227: if (*count >= ARRAY_SIZE(Drives.idmap[0])) {
228: dprintf(1, "No room to map drive %p\n", drive_g);
229: return;
230: }
231: u8 *pos = &idmap[*count];
232: *count = *count + 1;
233: if (CONFIG_THREADS) {
234: // Add to idmap with assured drive order.
235: u8 *end = pos;
236: for (;;) {
237: u8 *prev = pos - 1;
238: if (prev < idmap)
239: break;
240: struct drive_s *prevdrive = &Drives.drives[*prev];
241: if (prevdrive->type < drive_g->type
242: || (prevdrive->type == drive_g->type
243: && prevdrive->cntl_id < drive_g->cntl_id))
244: break;
245: pos--;
246: }
247: if (pos != end)
248: memmove(pos+1, pos, (void*)end-(void*)pos);
249: }
250: *pos = drive_g - Drives.drives;
251: }
252:
253: // Map a cd
254: void
255: map_cd_drive(struct drive_s *drive_g)
256: {
257: dprintf(3, "Mapping cd drive %p\n", drive_g);
258: add_ordered_drive(Drives.idmap[EXTTYPE_CD], &Drives.cdcount, drive_g);
259: }
260:
261: // Map a floppy
262: void
263: map_floppy_drive(struct drive_s *drive_g)
264: {
265: // fill idmap
266: dprintf(3, "Mapping floppy drive %p\n", drive_g);
267: add_ordered_drive(Drives.idmap[EXTTYPE_FLOPPY], &Drives.floppycount
268: , drive_g);
269:
270: // Update equipment word bits for floppy
271: if (Drives.floppycount == 1) {
272: // 1 drive, ready for boot
273: SETBITS_BDA(equipment_list_flags, 0x01);
274: SET_BDA(floppy_harddisk_info, 0x07);
275: } else if (Drives.floppycount >= 2) {
276: // 2 drives, ready for boot
277: SETBITS_BDA(equipment_list_flags, 0x41);
278: SET_BDA(floppy_harddisk_info, 0x77);
279: }
280: }
281:
282: // Show a one line description (without trailing newline) of a drive.
283: void
284: describe_drive(struct drive_s *drive_g)
285: {
286: ASSERT32();
287: u8 type = GET_GLOBAL(drive_g->type);
288: switch (type) {
289: case DTYPE_FLOPPY:
290: describe_floppy(drive_g);
291: break;
292: case DTYPE_ATA:
293: describe_ata(drive_g);
294: break;
295: case DTYPE_ATAPI:
296: describe_atapi(drive_g);
297: break;
298: case DTYPE_RAMDISK:
299: describe_ramdisk(drive_g);
300: break;
301: default:
302: printf("Unknown");
303: break;
304: }
305: }
306:
307:
308: /****************************************************************
309: * 16bit calling interface
310: ****************************************************************/
311:
312: // Execute a disk_op request.
313: int
314: process_op(struct disk_op_s *op)
315: {
316: u8 type = GET_GLOBAL(op->drive_g->type);
317: switch (type) {
318: case DTYPE_FLOPPY:
319: return process_floppy_op(op);
320: case DTYPE_ATA:
321: return process_ata_op(op);
322: case DTYPE_ATAPI:
323: return process_atapi_op(op);
324: case DTYPE_RAMDISK:
325: return process_ramdisk_op(op);
326: case DTYPE_CDEMU:
327: return process_cdemu_op(op);
328: default:
329: op->count = 0;
330: return DISK_RET_EPARAM;
331: }
332: }
333:
334: // Execute a "disk_op_s" request - this runs on a stack in the ebda.
335: static int
336: __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
337: {
338: struct disk_op_s dop;
339: memcpy_far(GET_SEG(SS), &dop
340: , op_seg, op_far
341: , sizeof(dop));
342:
343: dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
344: , dop.drive_g, (u32)dop.lba, dop.buf_fl
345: , dop.count, dop.command);
346:
347: int status = process_op(&dop);
348:
349: // Update count with total sectors transferred.
350: SET_FARVAR(op_seg, op_far->count, dop.count);
351:
352: return status;
353: }
354:
355: // Execute a "disk_op_s" request by jumping to a stack in the ebda.
356: int
357: send_disk_op(struct disk_op_s *op)
358: {
359: if (! CONFIG_DRIVES)
360: return -1;
361: ASSERT16();
362:
363: return stack_hop((u32)op, GET_SEG(SS), 0, __send_disk_op);
364: }
365:
366:
367: /****************************************************************
368: * Setup
369: ****************************************************************/
370:
371: void
372: drive_setup()
373: {
374: memset(&Drives, 0, sizeof(Drives));
375: memset(&Drives.idmap, 0xff, sizeof(Drives.idmap));
376: }
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