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
15 struct drives_s Drives VAR16VISIBLE;
18 getDrive(u8 exttype, u8 extdriveoffset)
20 if (extdriveoffset >= ARRAY_SIZE(Drives.idmap[0]))
22 struct drive_s *drive_gf = GET_GLOBAL(Drives.idmap[exttype][extdriveoffset]);
25 return GLOBALFLAT2GLOBAL(drive_gf);
29 /****************************************************************
30 * Disk geometry translation
31 ****************************************************************/
34 get_translation(struct drive_s *drive_g)
36 u8 type = GET_GLOBAL(drive_g->type);
37 if (! CONFIG_COREBOOT && type == DTYPE_ATA) {
38 // Emulators pass in the translation info via nvram.
39 u8 ataid = GET_GLOBAL(drive_g->cntl_id);
40 u8 channel = ataid / 2;
41 u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
42 translation >>= 2 * (ataid % 4);
47 // Otherwise use a heuristic to determine translation type.
48 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
49 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
50 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
51 u64 sectors = GET_GLOBAL(drive_g->sectors);
52 u64 psectors = (u64)heads * cylinders * spt;
53 if (!heads || !cylinders || !spt || psectors > sectors)
54 // pchs doesn't look valid - use LBA.
55 return TRANSLATION_LBA;
57 if (cylinders <= 1024 && heads <= 16 && spt <= 63)
58 return TRANSLATION_NONE;
59 if (cylinders * heads <= 131072)
60 return TRANSLATION_LARGE;
61 return TRANSLATION_LBA;
65 setup_translation(struct drive_s *drive_g)
67 u8 translation = get_translation(drive_g);
68 SET_GLOBAL(drive_g->translation, translation);
70 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
71 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
72 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
73 u64 sectors = GET_GLOBAL(drive_g->sectors);
74 const char *desc = NULL;
76 switch (translation) {
78 case TRANSLATION_NONE:
84 if (sectors > 63*255*1024) {
89 u32 sect = (u32)sectors / 63;
101 cylinders = sect / heads;
103 case TRANSLATION_RECHS:
105 // Take care not to overflow
110 cylinders = (u16)((u32)(cylinders)*16/15);
112 // then go through the large bitshift process
113 case TRANSLATION_LARGE:
114 if (translation == TRANSLATION_LARGE)
116 while (cylinders > 1024) {
120 // If we max out the head count
126 // clip to 1024 cylinders in lchs
127 if (cylinders > 1024)
129 dprintf(1, "drive %p: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d s=%d\n"
131 , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
133 , cylinders, heads, spt
136 SET_GLOBAL(drive_g->lchs.heads, heads);
137 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
138 SET_GLOBAL(drive_g->lchs.spt, spt);
142 /****************************************************************
144 ****************************************************************/
146 // Fill in Fixed Disk Parameter Table (located in ebda).
148 fill_fdpt(struct drive_s *drive_g, int hdid)
153 u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
154 u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
155 u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
157 u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
158 u16 nph = GET_GLOBAL(drive_g->pchs.heads);
159 u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
161 struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
162 fdpt->precompensation = 0xffff;
163 fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
164 fdpt->landing_zone = npc;
165 fdpt->cylinders = nlc;
167 fdpt->sectors = nlspt;
169 if (nlc != npc || nlh != nph || nlspt != npspt) {
170 // Logical mapping present - use extended structure.
172 // complies with Phoenix style Translated Fixed Disk Parameter
174 fdpt->phys_cylinders = npc;
175 fdpt->phys_heads = nph;
176 fdpt->phys_sectors = npspt;
177 fdpt->a0h_signature = 0xa0;
179 // Checksum structure.
180 fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
184 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
185 struct extended_bios_data_area_s, fdpt[0])));
187 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
188 struct extended_bios_data_area_s, fdpt[1])));
191 // Map a drive (that was registered via add_bcv_hd)
193 map_hd_drive(struct drive_s *drive_g)
196 u8 hdcount = GET_BDA(hdcount);
197 if (hdcount >= ARRAY_SIZE(Drives.idmap[0])) {
201 dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdcount);
202 Drives.idmap[EXTTYPE_HD][hdcount] = drive_g;
203 SET_BDA(hdcount, hdcount + 1);
205 // Fill "fdpt" structure.
206 fill_fdpt(drive_g, hdcount);
209 // Find spot to add a drive
211 add_ordered_drive(struct drive_s **idmap, u8 *count, struct drive_s *drive_g)
213 if (*count >= ARRAY_SIZE(Drives.idmap[0])) {
217 struct drive_s **pos = &idmap[*count];
219 if (CONFIG_THREADS) {
220 // Add to idmap with assured drive order.
221 struct drive_s **end = pos;
223 struct drive_s **prev = pos - 1;
226 struct drive_s *prevdrive = *prev;
227 if (prevdrive->type < drive_g->type
228 || (prevdrive->type == drive_g->type
229 && prevdrive->cntl_id < drive_g->cntl_id))
234 memmove(pos+1, pos, (void*)end-(void*)pos);
241 map_cd_drive(struct drive_s *drive_g)
243 dprintf(3, "Mapping cd drive %p\n", drive_g);
244 add_ordered_drive(Drives.idmap[EXTTYPE_CD], &Drives.cdcount, drive_g);
249 map_floppy_drive(struct drive_s *drive_g)
252 dprintf(3, "Mapping floppy drive %p\n", drive_g);
253 add_ordered_drive(Drives.idmap[EXTTYPE_FLOPPY], &Drives.floppycount
256 // Update equipment word bits for floppy
257 if (Drives.floppycount == 1) {
258 // 1 drive, ready for boot
259 SETBITS_BDA(equipment_list_flags, 0x01);
260 SET_BDA(floppy_harddisk_info, 0x07);
261 } else if (Drives.floppycount >= 2) {
262 // 2 drives, ready for boot
263 SETBITS_BDA(equipment_list_flags, 0x41);
264 SET_BDA(floppy_harddisk_info, 0x77);
269 /****************************************************************
270 * 16bit calling interface
271 ****************************************************************/
273 // Execute a disk_op request.
275 process_op(struct disk_op_s *op)
278 u8 type = GET_GLOBAL(op->drive_g->type);
281 return process_floppy_op(op);
283 return process_ata_op(op);
285 return process_atapi_op(op);
287 return process_ramdisk_op(op);
289 return process_cdemu_op(op);
291 return process_usb_op(op);
294 return DISK_RET_EPARAM;
298 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
300 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
302 struct disk_op_s dop;
303 memcpy_far(GET_SEG(SS), &dop
307 dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
308 , dop.drive_g, (u32)dop.lba, dop.buf_fl
309 , dop.count, dop.command);
311 int status = process_op(&dop);
313 // Update count with total sectors transferred.
314 SET_FARVAR(op_seg, op_far->count, dop.count);
319 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
321 send_disk_op(struct disk_op_s *op)
327 return stack_hop((u32)op, GET_SEG(SS), __send_disk_op);
331 /****************************************************************
333 ****************************************************************/
338 memset(&Drives, 0, sizeof(Drives));