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);
90 dprintf(1, "ata%d-%d: PCHS=%u/%d/%d translation="
91 , channel, slave, cylinders, heads, spt);
92 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:
119 dprintf(1, "r-echs");
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, " LCHS=%d/%d/%d\n", cylinders, heads, spt);
146 SET_GLOBAL(drive_g->lchs.heads, heads);
147 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
148 SET_GLOBAL(drive_g->lchs.spt, spt);
152 /****************************************************************
154 ****************************************************************/
156 // Fill in Fixed Disk Parameter Table (located in ebda).
158 fill_fdpt(struct drive_s *drive_g, int hdid)
163 u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
164 u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
165 u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
167 u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
168 u16 nph = GET_GLOBAL(drive_g->pchs.heads);
169 u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
171 struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
172 fdpt->precompensation = 0xffff;
173 fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
174 fdpt->landing_zone = npc;
175 fdpt->cylinders = nlc;
177 fdpt->sectors = nlspt;
179 if (nlc == npc && nlh == nph && nlspt == npspt)
180 // no logical CHS mapping used, just physical CHS
181 // use Standard Fixed Disk Parameter Table (FDPT)
184 // complies with Phoenix style Translated Fixed Disk Parameter
186 fdpt->phys_cylinders = npc;
187 fdpt->phys_heads = nph;
188 fdpt->phys_sectors = npspt;
189 fdpt->a0h_signature = 0xa0;
191 // Checksum structure.
192 fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
195 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
196 struct extended_bios_data_area_s, fdpt[0])));
198 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
199 struct extended_bios_data_area_s, fdpt[1])));
202 // Map a drive (that was registered via add_bcv_hd)
204 map_hd_drive(struct drive_s *drive_g)
207 u8 hdcount = GET_BDA(hdcount);
208 if (hdcount >= ARRAY_SIZE(Drives.idmap[0]))
210 dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdcount);
211 int driveid = drive_g - Drives.drives;
212 SET_GLOBAL(Drives.idmap[EXTTYPE_HD][hdcount], driveid);
213 SET_BDA(hdcount, hdcount + 1);
215 // Fill "fdpt" structure.
216 fill_fdpt(drive_g, hdcount);
221 map_cd_drive(struct drive_s *drive_g)
224 u8 cdcount = GET_GLOBAL(Drives.cdcount);
225 if (cdcount >= ARRAY_SIZE(Drives.idmap[0]))
227 dprintf(3, "Mapping cd drive %p to %d\n", drive_g, cdcount);
228 int driveid = drive_g - Drives.drives;
229 SET_GLOBAL(Drives.idmap[EXTTYPE_CD][cdcount], driveid);
230 SET_GLOBAL(Drives.cdcount, cdcount+1);
235 map_floppy_drive(struct drive_s *drive_g)
238 u8 floppycount = GET_GLOBAL(Drives.floppycount);
239 if (floppycount >= ARRAY_SIZE(Drives.idmap[0]))
241 dprintf(3, "Mapping floppy drive %p to %d\n", drive_g, floppycount);
242 int driveid = drive_g - Drives.drives;
243 SET_GLOBAL(Drives.idmap[EXTTYPE_FLOPPY][floppycount], driveid);
245 SET_GLOBAL(Drives.floppycount, floppycount);
247 // Update equipment word bits for floppy
248 if (floppycount == 1) {
249 // 1 drive, ready for boot
250 SETBITS_BDA(equipment_list_flags, 0x01);
251 SET_BDA(floppy_harddisk_info, 0x07);
253 // 2 drives, ready for boot
254 SETBITS_BDA(equipment_list_flags, 0x41);
255 SET_BDA(floppy_harddisk_info, 0x77);
259 // Show a one line description (without trailing newline) of a drive.
261 describe_drive(struct drive_s *drive_g)
264 u8 type = GET_GLOBAL(drive_g->type);
267 describe_floppy(drive_g);
270 describe_ata(drive_g);
273 describe_atapi(drive_g);
276 describe_ramdisk(drive_g);
285 /****************************************************************
286 * 16bit calling interface
287 ****************************************************************/
289 // Execute a disk_op request.
291 process_op(struct disk_op_s *op)
293 u8 type = GET_GLOBAL(op->drive_g->type);
296 return process_floppy_op(op);
298 return process_ata_op(op);
300 return process_atapi_op(op);
302 return process_ramdisk_op(op);
304 return process_cdemu_op(op);
307 return DISK_RET_EPARAM;
311 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
313 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
315 struct disk_op_s dop;
316 memcpy_far(GET_SEG(SS), &dop
320 dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
321 , dop.drive_g, (u32)dop.lba, dop.buf_fl
322 , dop.count, dop.command);
324 int status = process_op(&dop);
326 // Update count with total sectors transferred.
327 SET_FARVAR(op_seg, op_far->count, dop.count);
332 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
334 send_disk_op(struct disk_op_s *op)
340 return stack_hop((u32)op, GET_SEG(SS), 0, __send_disk_op);
344 /****************************************************************
346 ****************************************************************/
351 memset(&Drives, 0, sizeof(Drives));
352 memset(&Drives.idmap, 0xff, sizeof(Drives.idmap));