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 "usb-msc.h" // process_usb_op
14 #include "virtio-blk.h" // process_virtio_op
16 struct drives_s Drives VAR16VISIBLE;
19 getDrive(u8 exttype, u8 extdriveoffset)
21 if (extdriveoffset >= ARRAY_SIZE(Drives.idmap[0]))
23 struct drive_s *drive_gf = GET_GLOBAL(Drives.idmap[exttype][extdriveoffset]);
26 return GLOBALFLAT2GLOBAL(drive_gf);
30 /****************************************************************
31 * Disk geometry translation
32 ****************************************************************/
35 get_translation(struct drive_s *drive_g)
37 u8 type = GET_GLOBAL(drive_g->type);
38 if (! CONFIG_COREBOOT && type == DTYPE_ATA) {
39 // Emulators pass in the translation info via nvram.
40 u8 ataid = GET_GLOBAL(drive_g->cntl_id);
41 u8 channel = ataid / 2;
42 u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
43 translation >>= 2 * (ataid % 4);
48 // Otherwise use a heuristic to determine translation type.
49 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
50 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
51 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
52 u64 sectors = GET_GLOBAL(drive_g->sectors);
53 u64 psectors = (u64)heads * cylinders * spt;
54 if (!heads || !cylinders || !spt || psectors > sectors)
55 // pchs doesn't look valid - use LBA.
56 return TRANSLATION_LBA;
58 if (cylinders <= 1024 && heads <= 16 && spt <= 63)
59 return TRANSLATION_NONE;
60 if (cylinders * heads <= 131072)
61 return TRANSLATION_LARGE;
62 return TRANSLATION_LBA;
66 setup_translation(struct drive_s *drive_g)
68 u8 translation = get_translation(drive_g);
69 SET_GLOBAL(drive_g->translation, translation);
71 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
72 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
73 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
74 u64 sectors = GET_GLOBAL(drive_g->sectors);
75 const char *desc = NULL;
77 switch (translation) {
79 case TRANSLATION_NONE:
85 if (sectors > 63*255*1024) {
90 u32 sect = (u32)sectors / 63;
102 cylinders = sect / heads;
104 case TRANSLATION_RECHS:
106 // Take care not to overflow
111 cylinders = (u16)((u32)(cylinders)*16/15);
113 // then go through the large bitshift process
114 case TRANSLATION_LARGE:
115 if (translation == TRANSLATION_LARGE)
117 while (cylinders > 1024) {
121 // If we max out the head count
127 // clip to 1024 cylinders in lchs
128 if (cylinders > 1024)
130 dprintf(1, "drive %p: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d s=%d\n"
132 , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
134 , cylinders, heads, spt
137 SET_GLOBAL(drive_g->lchs.heads, heads);
138 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
139 SET_GLOBAL(drive_g->lchs.spt, spt);
143 /****************************************************************
145 ****************************************************************/
147 // Fill in Fixed Disk Parameter Table (located in ebda).
149 fill_fdpt(struct drive_s *drive_g, int hdid)
154 u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
155 u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
156 u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
158 u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
159 u16 nph = GET_GLOBAL(drive_g->pchs.heads);
160 u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
162 struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
163 fdpt->precompensation = 0xffff;
164 fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
165 fdpt->landing_zone = npc;
166 fdpt->cylinders = nlc;
168 fdpt->sectors = nlspt;
170 if (nlc != npc || nlh != nph || nlspt != npspt) {
171 // Logical mapping present - use extended structure.
173 // complies with Phoenix style Translated Fixed Disk Parameter
175 fdpt->phys_cylinders = npc;
176 fdpt->phys_heads = nph;
177 fdpt->phys_sectors = npspt;
178 fdpt->a0h_signature = 0xa0;
180 // Checksum structure.
181 fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
185 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
186 struct extended_bios_data_area_s, fdpt[0])));
188 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
189 struct extended_bios_data_area_s, fdpt[1])));
192 // Map a drive (that was registered via add_bcv_hd)
194 map_hd_drive(struct drive_s *drive_g)
197 u8 hdcount = GET_BDA(hdcount);
198 if (hdcount >= ARRAY_SIZE(Drives.idmap[0])) {
202 dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdcount);
203 Drives.idmap[EXTTYPE_HD][hdcount] = drive_g;
204 SET_BDA(hdcount, hdcount + 1);
206 // Fill "fdpt" structure.
207 fill_fdpt(drive_g, hdcount);
210 // Find spot to add a drive
212 add_ordered_drive(struct drive_s **idmap, u8 *count, struct drive_s *drive_g)
214 if (*count >= ARRAY_SIZE(Drives.idmap[0])) {
218 struct drive_s **pos = &idmap[*count];
220 if (CONFIG_THREADS) {
221 // Add to idmap with assured drive order.
222 struct drive_s **end = pos;
224 struct drive_s **prev = pos - 1;
227 struct drive_s *prevdrive = *prev;
228 if (prevdrive->type < drive_g->type
229 || (prevdrive->type == drive_g->type
230 && prevdrive->cntl_id < drive_g->cntl_id))
235 memmove(pos+1, pos, (void*)end-(void*)pos);
242 map_cd_drive(struct drive_s *drive_g)
244 dprintf(3, "Mapping cd drive %p\n", drive_g);
245 add_ordered_drive(Drives.idmap[EXTTYPE_CD], &Drives.cdcount, drive_g);
250 map_floppy_drive(struct drive_s *drive_g)
253 dprintf(3, "Mapping floppy drive %p\n", drive_g);
254 add_ordered_drive(Drives.idmap[EXTTYPE_FLOPPY], &Drives.floppycount
257 // Update equipment word bits for floppy
258 if (Drives.floppycount == 1) {
259 // 1 drive, ready for boot
260 SETBITS_BDA(equipment_list_flags, 0x01);
261 SET_BDA(floppy_harddisk_info, 0x07);
262 } else if (Drives.floppycount >= 2) {
263 // 2 drives, ready for boot
264 SETBITS_BDA(equipment_list_flags, 0x41);
265 SET_BDA(floppy_harddisk_info, 0x77);
270 /****************************************************************
271 * 16bit calling interface
272 ****************************************************************/
274 // Execute a disk_op request.
276 process_op(struct disk_op_s *op)
279 u8 type = GET_GLOBAL(op->drive_g->type);
282 return process_floppy_op(op);
284 return process_ata_op(op);
286 return process_atapi_op(op);
288 return process_ramdisk_op(op);
290 return process_cdemu_op(op);
292 return process_usb_op(op);
294 return process_virtio_op(op);
297 return DISK_RET_EPARAM;
301 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
303 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
305 struct disk_op_s dop;
306 memcpy_far(GET_SEG(SS), &dop
310 dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
311 , dop.drive_g, (u32)dop.lba, dop.buf_fl
312 , dop.count, dop.command);
314 int status = process_op(&dop);
316 // Update count with total sectors transferred.
317 SET_FARVAR(op_seg, op_far->count, dop.count);
322 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
324 send_disk_op(struct disk_op_s *op)
330 return stack_hop((u32)op, GET_SEG(SS), __send_disk_op);
334 /****************************************************************
336 ****************************************************************/
341 memset(&Drives, 0, sizeof(Drives));