1 // Disk setup and access
3 // Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
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
14 struct drives_s Drives VAR16VISIBLE;
17 getDrive(u8 exttype, u8 extdriveoffset)
19 // basic check : device has to be defined
20 if (extdriveoffset >= ARRAY_SIZE(Drives.idmap[0]))
23 // Get the ata channel
24 u8 driveid = GET_GLOBAL(Drives.idmap[exttype][extdriveoffset]);
26 // basic check : device has to be valid
27 if (driveid >= ARRAY_SIZE(Drives.drives))
30 return &Drives.drives[driveid];
36 int driveid = Drives.drivecount;
37 if (driveid >= ARRAY_SIZE(Drives.drives))
40 struct drive_s *drive_g = &Drives.drives[driveid];
41 memset(drive_g, 0, sizeof(*drive_g));
46 /****************************************************************
47 * Disk geometry translation
48 ****************************************************************/
51 get_translation(struct drive_s *drive_g)
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);
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);
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;
77 setup_translation(struct drive_s *drive_g)
79 u8 translation = get_translation(drive_g);
80 SET_GLOBAL(drive_g->translation, translation);
82 u8 ataid = GET_GLOBAL(drive_g->cntl_id);
83 u8 channel = 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;
91 switch (translation) {
93 case TRANSLATION_NONE:
99 if (sectors > 63*255*1024) {
104 u32 sect = (u32)sectors / 63;
116 cylinders = sect / heads;
118 case TRANSLATION_RECHS:
120 // Take care not to overflow
125 cylinders = (u16)((u32)(cylinders)*16/15);
127 // then go through the large bitshift process
128 case TRANSLATION_LARGE:
129 if (translation == TRANSLATION_LARGE)
131 while (cylinders > 1024) {
135 // If we max out the head count
141 // clip to 1024 cylinders in lchs
142 if (cylinders > 1024)
144 dprintf(1, "ata%d-%d: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d\n"
146 , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
148 , cylinders, heads, spt);
150 SET_GLOBAL(drive_g->lchs.heads, heads);
151 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
152 SET_GLOBAL(drive_g->lchs.spt, spt);
156 /****************************************************************
158 ****************************************************************/
160 // Fill in Fixed Disk Parameter Table (located in ebda).
162 fill_fdpt(struct drive_s *drive_g, int hdid)
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);
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);
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;
181 fdpt->sectors = nlspt;
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)
188 // complies with Phoenix style Translated Fixed Disk Parameter
190 fdpt->phys_cylinders = npc;
191 fdpt->phys_heads = nph;
192 fdpt->phys_sectors = npspt;
193 fdpt->a0h_signature = 0xa0;
195 // Checksum structure.
196 fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
199 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
200 struct extended_bios_data_area_s, fdpt[0])));
202 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
203 struct extended_bios_data_area_s, fdpt[1])));
206 // Map a drive (that was registered via add_bcv_hd)
208 map_hd_drive(struct drive_s *drive_g)
211 u8 hdcount = GET_BDA(hdcount);
212 if (hdcount >= ARRAY_SIZE(Drives.idmap[0]))
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);
219 // Fill "fdpt" structure.
220 fill_fdpt(drive_g, hdcount);
223 // Find spot to add a drive
225 add_ordered_drive(u8 *idmap, u8 *count, struct drive_s *drive_g)
227 if (*count >= ARRAY_SIZE(Drives.idmap[0])) {
228 dprintf(1, "No room to map drive %p\n", drive_g);
231 u8 *pos = &idmap[*count];
233 if (CONFIG_THREADS) {
234 // Add to idmap with assured drive order.
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))
248 memmove(pos+1, pos, (void*)end-(void*)pos);
250 *pos = drive_g - Drives.drives;
255 map_cd_drive(struct drive_s *drive_g)
257 dprintf(3, "Mapping cd drive %p\n", drive_g);
258 add_ordered_drive(Drives.idmap[EXTTYPE_CD], &Drives.cdcount, drive_g);
263 map_floppy_drive(struct drive_s *drive_g)
266 dprintf(3, "Mapping floppy drive %p\n", drive_g);
267 add_ordered_drive(Drives.idmap[EXTTYPE_FLOPPY], &Drives.floppycount
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);
282 // Show a one line description (without trailing newline) of a drive.
284 describe_drive(struct drive_s *drive_g)
287 u8 type = GET_GLOBAL(drive_g->type);
290 describe_floppy(drive_g);
293 describe_ata(drive_g);
296 describe_atapi(drive_g);
299 describe_ramdisk(drive_g);
308 /****************************************************************
309 * 16bit calling interface
310 ****************************************************************/
312 // Execute a disk_op request.
314 process_op(struct disk_op_s *op)
316 u8 type = GET_GLOBAL(op->drive_g->type);
319 return process_floppy_op(op);
321 return process_ata_op(op);
323 return process_atapi_op(op);
325 return process_ramdisk_op(op);
327 return process_cdemu_op(op);
330 return DISK_RET_EPARAM;
334 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
336 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
338 struct disk_op_s dop;
339 memcpy_far(GET_SEG(SS), &dop
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);
347 int status = process_op(&dop);
349 // Update count with total sectors transferred.
350 SET_FARVAR(op_seg, op_far->count, dop.count);
355 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
357 send_disk_op(struct disk_op_s *op)
363 return stack_hop((u32)op, GET_SEG(SS), 0, __send_disk_op);
367 /****************************************************************
369 ****************************************************************/
374 memset(&Drives, 0, sizeof(Drives));
375 memset(&Drives.idmap, 0xff, sizeof(Drives.idmap));