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freebsd-skq/sys/geom/part/g_part_pc98.c

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/*-
* Copyright (c) 2008 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bio.h>
#include <sys/diskpc98.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <geom/geom.h>
#include <geom/part/g_part.h>
#include "g_part_if.h"
#define SECSIZE 512
struct g_part_pc98_table {
struct g_part_table base;
u_char boot[SECSIZE];
u_char table[SECSIZE];
};
struct g_part_pc98_entry {
struct g_part_entry base;
struct pc98_partition ent;
};
static int g_part_pc98_add(struct g_part_table *, struct g_part_entry *,
struct g_part_parms *);
static int g_part_pc98_create(struct g_part_table *, struct g_part_parms *);
static int g_part_pc98_destroy(struct g_part_table *, struct g_part_parms *);
static int g_part_pc98_dumpto(struct g_part_table *, struct g_part_entry *);
static int g_part_pc98_modify(struct g_part_table *, struct g_part_entry *,
struct g_part_parms *);
static char *g_part_pc98_name(struct g_part_table *, struct g_part_entry *,
char *, size_t);
static int g_part_pc98_probe(struct g_part_table *, struct g_consumer *);
static int g_part_pc98_read(struct g_part_table *, struct g_consumer *);
static const char *g_part_pc98_type(struct g_part_table *, struct g_part_entry *,
char *, size_t);
static int g_part_pc98_write(struct g_part_table *, struct g_consumer *);
static kobj_method_t g_part_pc98_methods[] = {
KOBJMETHOD(g_part_add, g_part_pc98_add),
KOBJMETHOD(g_part_create, g_part_pc98_create),
KOBJMETHOD(g_part_destroy, g_part_pc98_destroy),
KOBJMETHOD(g_part_dumpto, g_part_pc98_dumpto),
KOBJMETHOD(g_part_modify, g_part_pc98_modify),
KOBJMETHOD(g_part_name, g_part_pc98_name),
KOBJMETHOD(g_part_probe, g_part_pc98_probe),
KOBJMETHOD(g_part_read, g_part_pc98_read),
KOBJMETHOD(g_part_type, g_part_pc98_type),
KOBJMETHOD(g_part_write, g_part_pc98_write),
{ 0, 0 }
};
static struct g_part_scheme g_part_pc98_scheme = {
"PC98",
g_part_pc98_methods,
sizeof(struct g_part_pc98_table),
.gps_entrysz = sizeof(struct g_part_pc98_entry),
.gps_minent = NDOSPART,
.gps_maxent = NDOSPART,
};
G_PART_SCHEME_DECLARE(g_part_pc98);
static int
pc98_parse_type(const char *type, u_char *dp_mid, u_char *dp_sid)
{
const char *alias;
char *endp;
long lt;
if (type[0] == '!') {
lt = strtol(type + 1, &endp, 0);
if (type[1] == '\0' || *endp != '\0' || lt <= 0 ||
lt >= 65536)
return (EINVAL);
*dp_mid = (u_char)lt;
*dp_sid = (u_char)(lt >> 8);
return (0);
}
alias = g_part_alias_name(G_PART_ALIAS_FREEBSD);
if (!strcasecmp(type, alias)) {
*dp_mid = (u_char)DOSMID_386BSD;
*dp_sid = (u_char)DOSSID_386BSD;
return (0);
}
return (EINVAL);
}
static void
pc98_set_chs(struct g_part_table *table, uint32_t lba, u_short *cylp,
u_char *hdp, u_char *secp)
{
uint32_t cyl, hd, sec;
sec = lba % table->gpt_sectors + 1;
lba /= table->gpt_sectors;
hd = lba % table->gpt_heads;
lba /= table->gpt_heads;
cyl = lba;
*cylp = htole16(cyl);
*hdp = hd;
*secp = sec;
}
static int
g_part_pc98_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
struct g_part_parms *gpp)
{
struct g_part_pc98_entry *entry;
struct g_part_pc98_table *table;
uint32_t cyl, start, size;
if (gpp->gpp_parms & G_PART_PARM_LABEL)
return (EINVAL);
cyl = basetable->gpt_heads * basetable->gpt_sectors;
entry = (struct g_part_pc98_entry *)baseentry;
table = (struct g_part_pc98_table *)basetable;
start = gpp->gpp_start;
size = gpp->gpp_size;
if (size < cyl)
return (EINVAL);
if (start % cyl) {
size = size - cyl + (start % cyl);
start = start - (start % cyl) + cyl;
}
if (size % cyl)
size = size - (size % cyl);
if (size < cyl)
return (EINVAL);
if (baseentry->gpe_deleted)
bzero(&entry->ent, sizeof(entry->ent));
KASSERT(baseentry->gpe_start <= start, (__func__));
KASSERT(baseentry->gpe_end >= start + size - 1, (__func__));
baseentry->gpe_start = start;
baseentry->gpe_end = start + size - 1;
pc98_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
&entry->ent.dp_shd, &entry->ent.dp_ssect);
pc98_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
&entry->ent.dp_ehd, &entry->ent.dp_esect);
return (pc98_parse_type(gpp->gpp_type, &entry->ent.dp_mid,
&entry->ent.dp_sid));
}
static int
g_part_pc98_create(struct g_part_table *basetable, struct g_part_parms *gpp)
{
struct g_consumer *cp;
struct g_provider *pp;
struct g_part_pc98_table *table;
uint64_t msize;
uint32_t cyl;
pp = gpp->gpp_provider;
cp = LIST_FIRST(&pp->consumers);
if (pp->sectorsize < SECSIZE || pp->mediasize < 2 * SECSIZE)
return (ENOSPC);
if (pp->sectorsize > SECSIZE)
return (ENXIO);
cyl = basetable->gpt_heads * basetable->gpt_sectors;
msize = pp->mediasize / SECSIZE;
basetable->gpt_first = cyl;
basetable->gpt_last = msize - (msize % cyl) - 1;
table = (struct g_part_pc98_table *)basetable;
le16enc(table->boot + DOSMAGICOFFSET, DOSMAGIC);
return (0);
}
static int
g_part_pc98_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
{
/* Wipe the first two sectors to clear the partitioning. */
basetable->gpt_smhead |= 3;
return (0);
}
static int
g_part_pc98_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
{
struct g_part_pc98_entry *entry;
/* Allow dumping to a FreeBSD partition only. */
entry = (struct g_part_pc98_entry *)baseentry;
return ((entry->ent.dp_mid == DOSMID_386BSD &&
entry->ent.dp_sid == DOSSID_386BSD) ? 1 : 0);
}
static int
g_part_pc98_modify(struct g_part_table *basetable,
struct g_part_entry *baseentry, struct g_part_parms *gpp)
{
struct g_part_pc98_entry *entry;
if (gpp->gpp_parms & G_PART_PARM_LABEL)
return (EINVAL);
entry = (struct g_part_pc98_entry *)baseentry;
if (gpp->gpp_parms & G_PART_PARM_TYPE)
return (pc98_parse_type(gpp->gpp_type, &entry->ent.dp_mid,
&entry->ent.dp_sid));
return (0);
}
static char *
g_part_pc98_name(struct g_part_table *table, struct g_part_entry *baseentry,
char *buf, size_t bufsz)
{
snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
return (buf);
}
static int
g_part_pc98_probe(struct g_part_table *table, struct g_consumer *cp)
{
struct g_provider *pp;
u_char *buf, *p;
int error, index, res, sum;
uint16_t magic;
pp = cp->provider;
/* Sanity-check the provider. */
if (pp->sectorsize < SECSIZE || pp->mediasize < 2 * SECSIZE)
return (ENOSPC);
if (pp->sectorsize > SECSIZE)
return (ENXIO);
/* Check that there's a PC98 partition table. */
buf = g_read_data(cp, 0L, 2 * SECSIZE, &error);
if (buf == NULL)
return (error);
/* We goto out on mismatch. */
res = ENXIO;
magic = le16dec(buf + DOSMAGICOFFSET);
if (magic != DOSMAGIC)
goto out;
sum = 0;
for (index = SECSIZE; index < 2 * SECSIZE; index++)
sum += buf[index];
if (sum == 0) {
res = G_PART_PROBE_PRI_LOW;
goto out;
}
for (index = 0; index < NDOSPART; index++) {
p = buf + SECSIZE + index * DOSPARTSIZE;
if (p[2] != 0 || p[3] != 0)
goto out;
if (p[1] == 0)
continue;
if (le16dec(p + 10) == 0)
goto out;
}
res = G_PART_PROBE_PRI_HIGH;
out:
g_free(buf);
return (res);
}
static int
g_part_pc98_read(struct g_part_table *basetable, struct g_consumer *cp)
{
struct pc98_partition ent;
struct g_provider *pp;
struct g_part_pc98_table *table;
struct g_part_pc98_entry *entry;
u_char *buf, *p;
off_t msize;
off_t start, end;
u_int cyl;
int error, index;
pp = cp->provider;
table = (struct g_part_pc98_table *)basetable;
msize = pp->mediasize / SECSIZE;
buf = g_read_data(cp, 0L, 2 * SECSIZE, &error);
if (buf == NULL)
return (error);
cyl = basetable->gpt_heads * basetable->gpt_sectors;
bcopy(buf, table->boot, sizeof(table->boot));
bcopy(buf + SECSIZE, table->table, sizeof(table->table));
for (index = NDOSPART - 1; index >= 0; index--) {
p = buf + SECSIZE + index * DOSPARTSIZE;
ent.dp_mid = p[0];
ent.dp_sid = p[1];
ent.dp_dum1 = p[2];
ent.dp_dum2 = p[3];
ent.dp_ipl_sct = p[4];
ent.dp_ipl_head = p[5];
ent.dp_ipl_cyl = le16dec(p + 6);
ent.dp_ssect = p[8];
ent.dp_shd = p[9];
ent.dp_scyl = le16dec(p + 10);
ent.dp_esect = p[12];
ent.dp_ehd = p[13];
ent.dp_ecyl = le16dec(p + 14);
bcopy(p + 16, ent.dp_name, sizeof(ent.dp_name));
if (ent.dp_sid == 0)
continue;
start = ent.dp_scyl * cyl;
end = (ent.dp_ecyl + 1) * cyl - 1;
entry = (struct g_part_pc98_entry *)g_part_new_entry(basetable,
index + 1, start, end);
entry->ent = ent;
}
basetable->gpt_entries = NDOSPART;
basetable->gpt_first = cyl;
basetable->gpt_last = msize - (msize % cyl) - 1;
return (0);
}
static const char *
g_part_pc98_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
char *buf, size_t bufsz)
{
struct g_part_pc98_entry *entry;
u_int type;
entry = (struct g_part_pc98_entry *)baseentry;
type = entry->ent.dp_mid + (entry->ent.dp_sid << 8);
if (type == DOSPTYP_386BSD)
return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
snprintf(buf, bufsz, "!%d", type);
return (buf);
}
static int
g_part_pc98_write(struct g_part_table *basetable, struct g_consumer *cp)
{
struct g_part_entry *baseentry;
struct g_part_pc98_entry *entry;
struct g_part_pc98_table *table;
u_char *p;
int error, index;
table = (struct g_part_pc98_table *)basetable;
baseentry = LIST_FIRST(&basetable->gpt_entry);
for (index = 1; index <= basetable->gpt_entries; index++) {
p = table->table + (index - 1) * DOSPARTSIZE;
entry = (baseentry != NULL && index == baseentry->gpe_index)
? (struct g_part_pc98_entry *)baseentry : NULL;
if (entry != NULL && !baseentry->gpe_deleted) {
p[0] = entry->ent.dp_mid;
p[1] = entry->ent.dp_sid;
p[2] = entry->ent.dp_dum1;
p[3] = entry->ent.dp_dum2;
p[4] = entry->ent.dp_ipl_sct;
p[5] = entry->ent.dp_ipl_head;
le16enc(p + 6, entry->ent.dp_ipl_cyl);
p[8] = entry->ent.dp_ssect;
p[9] = entry->ent.dp_shd;
le16enc(p + 10, entry->ent.dp_scyl);
p[12] = entry->ent.dp_esect;
p[13] = entry->ent.dp_ehd;
le16enc(p + 14, entry->ent.dp_ecyl);
bcopy(entry->ent.dp_name, p + 16,
sizeof(entry->ent.dp_name));
} else
bzero(p, DOSPARTSIZE);
if (entry != NULL)
baseentry = LIST_NEXT(baseentry, gpe_entry);
}
error = g_write_data(cp, 0, table->boot, SECSIZE);
if (!error)
error = g_write_data(cp, SECSIZE, table->table, SECSIZE);
return (error);
}
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