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freebsd/sys/geom/geom_pc98.c
Alexander Leidinger cb08c2cc83 Add some FEATURE macros for various GEOM classes.
No FreeBSD version bump, the userland application to query the features will
be committed last and can serve as an indication of the availablility if
needed.

Sponsored by:	Google Summer of Code 2010
Submitted by:	kibab
Reviewed by:	silence on geom@ during 2 weeks
X-MFC after:	to be determined in last commit with code from this project
2011-02-25 10:24:35 +00:00

372 lines
9.8 KiB
C

/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/endian.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/diskpc98.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>
FEATURE(geom_pc98, "GEOM NEC PC9800 partitioning support");
#define PC98_CLASS_NAME "PC98"
struct g_pc98_softc {
u_int fwsectors, fwheads, sectorsize;
int type[NDOSPART];
u_char sec[8192];
};
static void
g_pc98_print(int i, struct pc98_partition *dp)
{
char sname[17];
strncpy(sname, dp->dp_name, 16);
sname[16] = '\0';
hexdump(dp, sizeof(dp[0]), NULL, 0);
printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
printf(" sname:%s\n", sname);
}
/*
* XXX: Add gctl_req arg and give good error msgs.
* XXX: Check that length argument does not bring boot code inside any slice.
*/
static int
g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
{
int i, error;
off_t s[NDOSPART], l[NDOSPART];
struct pc98_partition dp[NDOSPART];
g_topology_assert();
if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
return (EBUSY);
#if 0
/*
* By convetion, it seems that the ipl program has a jump at location
* 0 to the real start of the boot loader. By convetion, it appears
* that after this jump, there's a string, terminated by at last one,
* if not more, zeros, followed by the target of the jump. FreeBSD's
* pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
* compatibility with some older boot loader. Linux98's boot loader
* appears to use 'Linux 98' followed by only two. GRUB/98 appears to
* use 'GRUB/98 ' followed by none. These last two appear to be
* ported from the ia32 versions, but appear to show similar
* convention. Grub/98 has an additional NOP after the jmp, which
* isn't present in others.
*
* The following test was inspired by looking only at partitions
* with FreeBSD's boot0 (or one that it is compatible with). As
* such, if failed when other IPL programs were used.
*/
if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
return (EBUSY);
#endif
for (i = 0; i < NDOSPART; i++)
pc98_partition_dec(
sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
for (i = 0; i < NDOSPART; i++) {
/* If start and end are identical it's bogus */
if (dp[i].dp_ssect == dp[i].dp_esect &&
dp[i].dp_shd == dp[i].dp_ehd &&
dp[i].dp_scyl == dp[i].dp_ecyl)
s[i] = l[i] = 0;
else if (dp[i].dp_ecyl == 0)
s[i] = l[i] = 0;
else {
s[i] = (off_t)dp[i].dp_scyl *
ms->fwsectors * ms->fwheads * ms->sectorsize;
l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
ms->fwsectors * ms->fwheads * ms->sectorsize;
}
if (bootverbose) {
printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
g_pc98_print(i, dp + i);
}
if (s[i] < 0 || l[i] < 0)
error = EBUSY;
else
error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
s[i], l[i], ms->sectorsize,
"%ss%d", gp->name, i + 1);
if (error)
return (error);
}
for (i = 0; i < NDOSPART; i++) {
ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
ms->sectorsize, "%ss%d", gp->name, i + 1);
}
bcopy(sec, ms->sec, sizeof (ms->sec));
return (0);
}
static int
g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
{
struct g_geom *gp;
struct g_pc98_softc *ms;
struct g_slicer *gsp;
struct g_consumer *cp;
int error, opened;
gp = pp->geom;
gsp = gp->softc;
ms = gsp->softc;
opened = 0;
error = 0;
switch(cmd) {
case DIOCSPC98: {
if (!(fflag & FWRITE))
return (EPERM);
DROP_GIANT();
g_topology_lock();
cp = LIST_FIRST(&gp->consumer);
if (cp->acw == 0) {
error = g_access(cp, 0, 1, 0);
if (error == 0)
opened = 1;
}
if (!error)
error = g_pc98_modify(gp, ms, data, 8192);
if (!error)
error = g_write_data(cp, 0, data, 8192);
if (opened)
g_access(cp, 0, -1 , 0);
g_topology_unlock();
PICKUP_GIANT();
return(error);
}
default:
return (ENOIOCTL);
}
}
static int
g_pc98_start(struct bio *bp)
{
struct g_provider *pp;
struct g_geom *gp;
struct g_pc98_softc *mp;
struct g_slicer *gsp;
int idx;
pp = bp->bio_to;
idx = pp->index;
gp = pp->geom;
gsp = gp->softc;
mp = gsp->softc;
if (bp->bio_cmd == BIO_GETATTR) {
if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
return (1);
if (g_handleattr_off_t(bp, "PC98::offset",
gsp->slices[idx].offset))
return (1);
}
return (0);
}
static void
g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp __unused, struct g_provider *pp)
{
struct g_pc98_softc *mp;
struct g_slicer *gsp;
struct pc98_partition dp;
char sname[17];
gsp = gp->softc;
mp = gsp->softc;
g_slice_dumpconf(sb, indent, gp, cp, pp);
if (pp != NULL) {
pc98_partition_dec(
mp->sec + 512 +
pp->index * sizeof(struct pc98_partition), &dp);
strncpy(sname, dp.dp_name, 16);
sname[16] = '\0';
if (indent == NULL) {
sbuf_printf(sb, " ty %d", mp->type[pp->index]);
sbuf_printf(sb, " sn %s", sname);
} else {
sbuf_printf(sb, "%s<type>%d</type>\n", indent,
mp->type[pp->index]);
sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
sname);
}
}
}
static struct g_geom *
g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
{
struct g_geom *gp;
struct g_consumer *cp;
int error;
struct g_pc98_softc *ms;
u_int fwsectors, fwheads, sectorsize;
u_char *buf;
g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
if (flags == G_TF_NORMAL &&
!strcmp(pp->geom->class->name, PC98_CLASS_NAME))
return (NULL);
gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
if (gp == NULL)
return (NULL);
g_topology_unlock();
do {
if (gp->rank != 2 && flags == G_TF_NORMAL)
break;
error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
if (error || fwsectors == 0) {
fwsectors = 17;
if (bootverbose)
printf("g_pc98_taste: guessing %d sectors\n",
fwsectors);
}
error = g_getattr("GEOM::fwheads", cp, &fwheads);
if (error || fwheads == 0) {
fwheads = 8;
if (bootverbose)
printf("g_pc98_taste: guessing %d heads\n",
fwheads);
}
sectorsize = cp->provider->sectorsize;
if (sectorsize % 512 != 0)
break;
buf = g_read_data(cp, 0, 8192, NULL);
if (buf == NULL)
break;
ms->fwsectors = fwsectors;
ms->fwheads = fwheads;
ms->sectorsize = sectorsize;
g_topology_lock();
g_pc98_modify(gp, ms, buf, 8192);
g_topology_unlock();
g_free(buf);
break;
} while (0);
g_topology_lock();
g_access(cp, -1, 0, 0);
if (LIST_EMPTY(&gp->provider)) {
g_slice_spoiled(cp);
return (NULL);
}
return (gp);
}
static void
g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_pc98_softc *ms;
struct g_slicer *gsp;
int opened = 0, error = 0;
void *data;
int len;
g_topology_assert();
gp = gctl_get_geom(req, mp, "geom");
if (gp == NULL)
return;
if (strcmp(verb, "write PC98")) {
gctl_error(req, "Unknown verb");
return;
}
gsp = gp->softc;
ms = gsp->softc;
data = gctl_get_param(req, "data", &len);
if (data == NULL)
return;
if (len < 8192 || (len % 512)) {
gctl_error(req, "Wrong request length");
return;
}
cp = LIST_FIRST(&gp->consumer);
if (cp->acw == 0) {
error = g_access(cp, 0, 1, 0);
if (error == 0)
opened = 1;
}
if (!error)
error = g_pc98_modify(gp, ms, data, len);
if (error)
gctl_error(req, "conflict with open slices");
if (!error)
error = g_write_data(cp, 0, data, len);
if (error)
gctl_error(req, "sector zero write failed");
if (opened)
g_access(cp, 0, -1 , 0);
return;
}
static struct g_class g_pc98_class = {
.name = PC98_CLASS_NAME,
.version = G_VERSION,
.taste = g_pc98_taste,
.dumpconf = g_pc98_dumpconf,
.ctlreq = g_pc98_config,
.ioctl = g_pc98_ioctl,
};
DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);