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
13 #include "ahci.h" // process_ahci_op
14 #include "usb-msc.h" // process_usb_op
15 #include "virtio-blk.h" // process_virtio_op
17 struct drives_s Drives VAR16VISIBLE;
20 getDrive(u8 exttype, u8 extdriveoffset)
22 if (extdriveoffset >= ARRAY_SIZE(Drives.idmap[0]))
24 struct drive_s *drive_gf = GET_GLOBAL(Drives.idmap[exttype][extdriveoffset]);
27 return GLOBALFLAT2GLOBAL(drive_gf);
30 int getDriveId(u8 exttype, struct drive_s *drive_g)
34 for (i = 0; i < ARRAY_SIZE(Drives.idmap[0]); i++)
35 if (getDrive(exttype, i) == drive_g)
41 /****************************************************************
42 * Disk geometry translation
43 ****************************************************************/
46 get_translation(struct drive_s *drive_g)
48 u8 type = GET_GLOBAL(drive_g->type);
49 if (! CONFIG_COREBOOT && type == DTYPE_ATA) {
50 // Emulators pass in the translation info via nvram.
51 u8 ataid = GET_GLOBAL(drive_g->cntl_id);
52 u8 channel = ataid / 2;
53 u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
54 translation >>= 2 * (ataid % 4);
59 // Otherwise use a heuristic to determine translation type.
60 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
61 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
62 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
63 u64 sectors = GET_GLOBAL(drive_g->sectors);
64 u64 psectors = (u64)heads * cylinders * spt;
65 if (!heads || !cylinders || !spt || psectors > sectors)
66 // pchs doesn't look valid - use LBA.
67 return TRANSLATION_LBA;
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 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
83 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
84 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
85 u64 sectors = GET_GLOBAL(drive_g->sectors);
86 const char *desc = NULL;
88 switch (translation) {
90 case TRANSLATION_NONE:
96 if (sectors > 63*255*1024) {
101 u32 sect = (u32)sectors / 63;
113 cylinders = sect / heads;
115 case TRANSLATION_RECHS:
117 // Take care not to overflow
122 cylinders = (u16)((u32)(cylinders)*16/15);
124 // then go through the large bitshift process
125 case TRANSLATION_LARGE:
126 if (translation == TRANSLATION_LARGE)
128 while (cylinders > 1024) {
132 // If we max out the head count
138 // clip to 1024 cylinders in lchs
139 if (cylinders > 1024)
141 dprintf(1, "drive %p: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d s=%d\n"
143 , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
145 , cylinders, heads, spt
148 SET_GLOBAL(drive_g->lchs.heads, heads);
149 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
150 SET_GLOBAL(drive_g->lchs.spt, spt);
154 /****************************************************************
156 ****************************************************************/
158 // Fill in Fixed Disk Parameter Table (located in ebda).
160 fill_fdpt(struct drive_s *drive_g, int hdid)
165 u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
166 u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
167 u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
169 u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
170 u16 nph = GET_GLOBAL(drive_g->pchs.heads);
171 u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
173 struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
174 fdpt->precompensation = 0xffff;
175 fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
176 fdpt->landing_zone = npc;
177 fdpt->cylinders = nlc;
179 fdpt->sectors = nlspt;
181 if (nlc != npc || nlh != nph || nlspt != npspt) {
182 // Logical mapping present - use extended structure.
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));
196 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
197 struct extended_bios_data_area_s, fdpt[0])));
199 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
200 struct extended_bios_data_area_s, fdpt[1])));
203 // Map a drive (that was registered via add_bcv_hd)
205 map_hd_drive(struct drive_s *drive_g)
208 u8 hdcount = GET_BDA(hdcount);
209 if (hdcount >= ARRAY_SIZE(Drives.idmap[0])) {
213 dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdcount);
214 Drives.idmap[EXTTYPE_HD][hdcount] = drive_g;
215 SET_BDA(hdcount, hdcount + 1);
217 // Fill "fdpt" structure.
218 fill_fdpt(drive_g, hdcount);
221 // Find spot to add a drive
223 add_ordered_drive(struct drive_s **idmap, u8 *count, struct drive_s *drive_g)
225 if (*count >= ARRAY_SIZE(Drives.idmap[0])) {
229 idmap[*count] = drive_g;
235 map_cd_drive(struct drive_s *drive_g)
237 dprintf(3, "Mapping cd drive %p\n", drive_g);
238 add_ordered_drive(Drives.idmap[EXTTYPE_CD], &Drives.cdcount, drive_g);
243 map_floppy_drive(struct drive_s *drive_g)
246 dprintf(3, "Mapping floppy drive %p\n", drive_g);
247 add_ordered_drive(Drives.idmap[EXTTYPE_FLOPPY], &Drives.floppycount
250 // Update equipment word bits for floppy
251 if (Drives.floppycount == 1) {
252 // 1 drive, ready for boot
253 SETBITS_BDA(equipment_list_flags, 0x01);
254 SET_BDA(floppy_harddisk_info, 0x07);
255 } else if (Drives.floppycount >= 2) {
256 // 2 drives, ready for boot
257 SETBITS_BDA(equipment_list_flags, 0x41);
258 SET_BDA(floppy_harddisk_info, 0x77);
263 /****************************************************************
264 * 16bit calling interface
265 ****************************************************************/
267 // Execute a disk_op request.
269 process_op(struct disk_op_s *op)
272 u8 type = GET_GLOBAL(op->drive_g->type);
275 return process_floppy_op(op);
277 return process_ata_op(op);
279 return process_atapi_op(op);
281 return process_ramdisk_op(op);
283 return process_cdemu_op(op);
285 return process_usb_op(op);
287 return process_virtio_op(op);
289 return process_ahci_op(op);
292 return DISK_RET_EPARAM;
296 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
298 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
300 struct disk_op_s dop;
301 memcpy_far(GET_SEG(SS), &dop
305 dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
306 , dop.drive_g, (u32)dop.lba, dop.buf_fl
307 , dop.count, dop.command);
309 int status = process_op(&dop);
311 // Update count with total sectors transferred.
312 SET_FARVAR(op_seg, op_far->count, dop.count);
317 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
319 send_disk_op(struct disk_op_s *op)
325 return stack_hop((u32)op, GET_SEG(SS), __send_disk_op);