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 u8 FloppyCount VAR16VISIBLE;
19 struct drive_s *IDMap[3][CONFIG_MAX_EXTDRIVE] VAR16VISIBLE;
22 getDrive(u8 exttype, u8 extdriveoffset)
24 if (extdriveoffset >= ARRAY_SIZE(IDMap[0]))
26 struct drive_s *drive_gf = GET_GLOBAL(IDMap[exttype][extdriveoffset]);
29 return GLOBALFLAT2GLOBAL(drive_gf);
32 int getDriveId(u8 exttype, struct drive_s *drive_g)
35 for (i = 0; i < ARRAY_SIZE(IDMap[0]); i++)
36 if (getDrive(exttype, i) == drive_g)
42 /****************************************************************
43 * Disk geometry translation
44 ****************************************************************/
47 get_translation(struct drive_s *drive_g)
49 u8 type = GET_GLOBAL(drive_g->type);
50 if (! CONFIG_COREBOOT && type == DTYPE_ATA) {
51 // Emulators pass in the translation info via nvram.
52 u8 ataid = GET_GLOBAL(drive_g->cntl_id);
53 u8 channel = ataid / 2;
54 u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
55 translation >>= 2 * (ataid % 4);
60 // Otherwise use a heuristic to determine translation type.
61 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
62 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
63 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
64 u64 sectors = GET_GLOBAL(drive_g->sectors);
65 u64 psectors = (u64)heads * cylinders * spt;
66 if (!heads || !cylinders || !spt || psectors > sectors)
67 // pchs doesn't look valid - use LBA.
68 return TRANSLATION_LBA;
70 if (cylinders <= 1024 && heads <= 16 && spt <= 63)
71 return TRANSLATION_NONE;
72 if (cylinders * heads <= 131072)
73 return TRANSLATION_LARGE;
74 return TRANSLATION_LBA;
78 setup_translation(struct drive_s *drive_g)
80 u8 translation = get_translation(drive_g);
81 SET_GLOBAL(drive_g->translation, translation);
83 u16 heads = GET_GLOBAL(drive_g->pchs.heads);
84 u16 cylinders = GET_GLOBAL(drive_g->pchs.cylinders);
85 u16 spt = GET_GLOBAL(drive_g->pchs.spt);
86 u64 sectors = GET_GLOBAL(drive_g->sectors);
87 const char *desc = NULL;
89 switch (translation) {
91 case TRANSLATION_NONE:
97 if (sectors > 63*255*1024) {
102 u32 sect = (u32)sectors / 63;
114 cylinders = sect / heads;
116 case TRANSLATION_RECHS:
118 // Take care not to overflow
123 cylinders = (u16)((u32)(cylinders)*16/15);
125 // then go through the large bitshift process
126 case TRANSLATION_LARGE:
127 if (translation == TRANSLATION_LARGE)
129 while (cylinders > 1024) {
133 // If we max out the head count
139 // clip to 1024 cylinders in lchs
140 if (cylinders > 1024)
142 dprintf(1, "drive %p: PCHS=%u/%d/%d translation=%s LCHS=%d/%d/%d s=%d\n"
144 , drive_g->pchs.cylinders, drive_g->pchs.heads, drive_g->pchs.spt
146 , cylinders, heads, spt
149 SET_GLOBAL(drive_g->lchs.heads, heads);
150 SET_GLOBAL(drive_g->lchs.cylinders, cylinders);
151 SET_GLOBAL(drive_g->lchs.spt, spt);
155 /****************************************************************
157 ****************************************************************/
159 // Fill in Fixed Disk Parameter Table (located in ebda).
161 fill_fdpt(struct drive_s *drive_g, int hdid)
166 u16 nlc = GET_GLOBAL(drive_g->lchs.cylinders);
167 u16 nlh = GET_GLOBAL(drive_g->lchs.heads);
168 u16 nlspt = GET_GLOBAL(drive_g->lchs.spt);
170 u16 npc = GET_GLOBAL(drive_g->pchs.cylinders);
171 u16 nph = GET_GLOBAL(drive_g->pchs.heads);
172 u16 npspt = GET_GLOBAL(drive_g->pchs.spt);
174 struct fdpt_s *fdpt = &get_ebda_ptr()->fdpt[hdid];
175 fdpt->precompensation = 0xffff;
176 fdpt->drive_control_byte = 0xc0 | ((nph > 8) << 3);
177 fdpt->landing_zone = npc;
178 fdpt->cylinders = nlc;
180 fdpt->sectors = nlspt;
182 if (nlc != npc || nlh != nph || nlspt != npspt) {
183 // Logical mapping present - use extended structure.
185 // complies with Phoenix style Translated Fixed Disk Parameter
187 fdpt->phys_cylinders = npc;
188 fdpt->phys_heads = nph;
189 fdpt->phys_sectors = npspt;
190 fdpt->a0h_signature = 0xa0;
192 // Checksum structure.
193 fdpt->checksum -= checksum(fdpt, sizeof(*fdpt));
197 SET_IVT(0x41, SEGOFF(get_ebda_seg(), offsetof(
198 struct extended_bios_data_area_s, fdpt[0])));
200 SET_IVT(0x46, SEGOFF(get_ebda_seg(), offsetof(
201 struct extended_bios_data_area_s, fdpt[1])));
204 // Find spot to add a drive
206 add_drive(struct drive_s **idmap, u8 *count, struct drive_s *drive_g)
208 if (*count >= ARRAY_SIZE(IDMap[0])) {
212 idmap[*count] = drive_g;
218 map_hd_drive(struct drive_s *drive_g)
221 struct bios_data_area_s *bda = MAKE_FLATPTR(SEG_BDA, 0);
222 int hdid = bda->hdcount;
223 dprintf(3, "Mapping hd drive %p to %d\n", drive_g, hdid);
224 add_drive(IDMap[EXTTYPE_HD], &bda->hdcount, drive_g);
226 // Setup disk geometry translation.
227 setup_translation(drive_g);
229 // Fill "fdpt" structure.
230 fill_fdpt(drive_g, hdid);
235 map_cd_drive(struct drive_s *drive_g)
237 dprintf(3, "Mapping cd drive %p\n", drive_g);
238 add_drive(IDMap[EXTTYPE_CD], &CDCount, drive_g);
243 map_floppy_drive(struct drive_s *drive_g)
245 dprintf(3, "Mapping floppy drive %p\n", drive_g);
246 add_drive(IDMap[EXTTYPE_FLOPPY], &FloppyCount, drive_g);
248 // Update equipment word bits for floppy
249 if (FloppyCount == 1) {
250 // 1 drive, ready for boot
251 SETBITS_BDA(equipment_list_flags, 0x01);
252 SET_BDA(floppy_harddisk_info, 0x07);
253 } else if (FloppyCount >= 2) {
254 // 2 drives, ready for boot
255 SETBITS_BDA(equipment_list_flags, 0x41);
256 SET_BDA(floppy_harddisk_info, 0x77);
261 /****************************************************************
262 * 16bit calling interface
263 ****************************************************************/
265 // Execute a disk_op request.
267 process_op(struct disk_op_s *op)
270 u8 type = GET_GLOBAL(op->drive_g->type);
273 return process_floppy_op(op);
275 return process_ata_op(op);
277 return process_atapi_op(op);
279 return process_ramdisk_op(op);
281 return process_cdemu_op(op);
283 return process_usb_op(op);
285 return process_virtio_op(op);
287 return process_ahci_op(op);
290 return DISK_RET_EPARAM;
294 // Execute a "disk_op_s" request - this runs on a stack in the ebda.
296 __send_disk_op(struct disk_op_s *op_far, u16 op_seg)
298 struct disk_op_s dop;
299 memcpy_far(GET_SEG(SS), &dop
303 dprintf(DEBUG_HDL_13, "disk_op d=%p lba=%d buf=%p count=%d cmd=%d\n"
304 , dop.drive_g, (u32)dop.lba, dop.buf_fl
305 , dop.count, dop.command);
307 int status = process_op(&dop);
309 // Update count with total sectors transferred.
310 SET_FARVAR(op_seg, op_far->count, dop.count);
315 // Execute a "disk_op_s" request by jumping to a stack in the ebda.
317 send_disk_op(struct disk_op_s *op)
323 return stack_hop((u32)op, GET_SEG(SS), __send_disk_op);