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);
31 /****************************************************************
32 * Disk geometry translation
33 ****************************************************************/
36 get_translation(struct drive_s *drive_g)
38 u8 type = GET_GLOBAL(drive_g->type);
39 if (! CONFIG_COREBOOT && type == DTYPE_ATA) {
40 // Emulators pass in the translation info via nvram.
41 u8 ataid = GET_GLOBAL(drive_g->cntl_id);
42 u8 channel = ataid / 2;
43 u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
44 translation >>= 2 * (ataid % 4);
49 // Otherwise use a heuristic to determine translation type.
50 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
51 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
52 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
53 u64 sectors = GET_GLOBAL(drive_g->sectors);
54 u64 psectors = (u64)heads * cylinders * spt;
55 if (!heads || !cylinders || !spt || psectors > sectors)
56 // pchs doesn't look valid - use LBA.
57 return TRANSLATION_LBA;
59 if (cylinders <= 1024 && heads <= 16 && spt <= 63)
60 return TRANSLATION_NONE;
61 if (cylinders * heads <= 131072)
62 return TRANSLATION_LARGE;
63 return TRANSLATION_LBA;
67 setup_translation(struct drive_s *drive_g)
69 u8 translation = get_translation(drive_g);
70 SET_GLOBAL(drive_g->translation, translation);
72 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
73 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
74 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
75 u64 sectors = GET_GLOBAL(drive_g->sectors);
76 const char *desc = NULL;
78 switch (translation) {
80 case TRANSLATION_NONE:
86 if (sectors > 63*255*1024) {
91 u32 sect = (u32)sectors / 63;
103 cylinders = sect / heads;
105 case TRANSLATION_RECHS:
107 // Take care not to overflow
112 cylinders = (u16)((u32)(cylinders)*16/15);
114 // then go through the large bitshift process
115 case TRANSLATION_LARGE:
116 if (translation == TRANSLATION_LARGE)
118 while (cylinders > 1024) {
122 // If we max out the head count
128 // clip to 1024 cylinders in lchs
129 if (cylinders > 1024)
131 dprintf(1, "drive %p: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d s=%d\n"
133 , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
135 , cylinders, heads, spt
138 SET_GLOBAL(drive_g->lchs.heads, heads);
139 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
140 SET_GLOBAL(drive_g->lchs.spt, spt);
144 /****************************************************************
146 ****************************************************************/
148 // Fill in Fixed Disk Parameter Table (located in ebda).
150 fill_fdpt(struct drive_s *drive_g, int hdid)
155 u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
156 u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
157 u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
159 u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
160 u16 nph = GET_GLOBAL(drive_g->pchs.heads);
161 u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
163 struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
164 fdpt->precompensation = 0xffff;
165 fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
166 fdpt->landing_zone = npc;
167 fdpt->cylinders = nlc;
169 fdpt->sectors = nlspt;
171 if (nlc != npc || nlh != nph || nlspt != npspt) {
172 // Logical mapping present - use extended structure.
174 // complies with Phoenix style Translated Fixed Disk Parameter
176 fdpt->phys_cylinders = npc;
177 fdpt->phys_heads = nph;
178 fdpt->phys_sectors = npspt;
179 fdpt->a0h_signature = 0xa0;
181 // Checksum structure.
182 fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
186 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
187 struct extended_bios_data_area_s, fdpt[0])));
189 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
190 struct extended_bios_data_area_s, fdpt[1])));
193 // Map a drive (that was registered via add_bcv_hd)
195 map_hd_drive(struct drive_s *drive_g)
198 u8 hdcount = GET_BDA(hdcount);
199 if (hdcount >= ARRAY_SIZE(Drives.idmap[0])) {
203 dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdcount);
204 Drives.idmap[EXTTYPE_HD][hdcount] = drive_g;
205 SET_BDA(hdcount, hdcount + 1);
207 // Fill "fdpt" structure.
208 fill_fdpt(drive_g, hdcount);
211 // Find spot to add a drive
213 add_ordered_drive(struct drive_s **idmap, u8 *count, struct drive_s *drive_g)
215 if (*count >= ARRAY_SIZE(Drives.idmap[0])) {
219 struct drive_s **pos = &idmap[*count];
221 if (CONFIG_THREADS) {
222 // Add to idmap with assured drive order.
223 struct drive_s **end = pos;
225 struct drive_s **prev = pos - 1;
228 struct drive_s *prevdrive = *prev;
229 if (prevdrive->type < drive_g->type
230 || (prevdrive->type == drive_g->type
231 && prevdrive->cntl_id < drive_g->cntl_id))
236 memmove(pos+1, pos, (void*)end-(void*)pos);
243 map_cd_drive(struct drive_s *drive_g)
245 dprintf(3, "Mapping cd drive %p\n", drive_g);
246 add_ordered_drive(Drives.idmap[EXTTYPE_CD], &Drives.cdcount, drive_g);
251 map_floppy_drive(struct drive_s *drive_g)
254 dprintf(3, "Mapping floppy drive %p\n", drive_g);
255 add_ordered_drive(Drives.idmap[EXTTYPE_FLOPPY], &Drives.floppycount
258 // Update equipment word bits for floppy
259 if (Drives.floppycount == 1) {
260 // 1 drive, ready for boot
261 SETBITS_BDA(equipment_list_flags, 0x01);
262 SET_BDA(floppy_harddisk_info, 0x07);
263 } else if (Drives.floppycount >= 2) {
264 // 2 drives, ready for boot
265 SETBITS_BDA(equipment_list_flags, 0x41);
266 SET_BDA(floppy_harddisk_info, 0x77);
271 /****************************************************************
272 * 16bit calling interface
273 ****************************************************************/
275 // Execute a disk_op request.
277 process_op(struct disk_op_s *op)
280 u8 type = GET_GLOBAL(op->drive_g->type);
283 return process_floppy_op(op);
285 return process_ata_op(op);
287 return process_atapi_op(op);
289 return process_ramdisk_op(op);
291 return process_cdemu_op(op);
293 return process_usb_op(op);
295 return process_virtio_op(op);
297 return process_ahci_op(op);
300 return DISK_RET_EPARAM;
304 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
306 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
308 struct disk_op_s dop;
309 memcpy_far(GET_SEG(SS), &dop
313 dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
314 , dop.drive_g, (u32)dop.lba, dop.buf_fl
315 , dop.count, dop.command);
317 int status = process_op(&dop);
319 // Update count with total sectors transferred.
320 SET_FARVAR(op_seg, op_far->count, dop.count);
325 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
327 send_disk_op(struct disk_op_s *op)
333 return stack_hop((u32)op, GET_SEG(SS), __send_disk_op);