NetBSD-5.0.2/sys/arch/atari/stand/installboot/disklabel.c
/* $NetBSD: disklabel.c,v 1.2.164.1 2009/01/16 22:57:33 bouyer Exp $ */
/*
* Copyright (c) 1995 Waldi Ravens
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Waldi Ravens.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* 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/types.h>
#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <sys/disklabel.h>
#include <machine/ahdilabel.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <err.h>
#if (BBSIZE < MINBBSIZE)
#error BBSIZE is smaller than MINBBSIZE
#endif
struct ahdilabel {
u_int nsecs;
daddr_t bslst;
daddr_t bslend;
u_int nroots;
daddr_t *roots;
u_int nparts;
struct ahdi_part *parts;
};
u_int dkcksum __P((struct disklabel *));
u_int32_t readdisklabel __P((char *, struct disklabel *));
static int bsd_label __P((int, off_t, struct disklabel *));
static int ahdi_label __P((int, u_int32_t *, struct disklabel *));
static int ahdi_getparts __P((int, daddr_t, daddr_t, struct ahdilabel *));
u_int
dkcksum (dl)
struct disklabel *dl;
{
u_int16_t sum = 0,
*st = (u_int16_t *)dl,
*end = (u_int16_t *)&dl->d_partitions[dl->d_npartitions];
while (st < end)
sum ^= *st++;
return(sum);
}
u_int32_t
readdisklabel (fn, dl)
char *fn;
struct disklabel *dl;
{
int fd, e;
u_int32_t bbsec;
memset(dl, 0, sizeof *dl);
if ((fd = open(fn, O_RDONLY)) < 0)
err(EXIT_FAILURE, "%s", fn);
/* Try NetBSD/Atari format first */
if ((e = bsd_label(fd, (off_t)0, dl)) < 0)
err(EXIT_FAILURE, "%s", fn);
if (!e)
return(0);
/* Try unprotected AHDI format last */
if ((e = ahdi_label(fd, &bbsec, dl)) < 0)
err(EXIT_FAILURE, "%s", fn);
if (!e)
return(bbsec);
warnx("%s: Unknown disk label format.", fn);
return(NO_BOOT_BLOCK);
}
static int
bsd_label (fd, offs, label)
int fd;
off_t offs;
struct disklabel *label;
{
struct bootblock bb;
struct disklabel *p;
if (lseek(fd, offs, SEEK_SET) != offs)
return(-1);
if (read(fd, &bb, sizeof(bb)) != sizeof(bb))
return(-1);
p = (struct disklabel *)bb.bb_label;
if ( (offs == 0 && bb.bb_magic != NBDAMAGIC)
|| (offs != 0 && bb.bb_magic != AHDIMAGIC)
|| p->d_npartitions > MAXPARTITIONS
|| p->d_magic2 != DISKMAGIC
|| p->d_magic != DISKMAGIC
|| dkcksum(p) != 0
) {
return(1);
}
*label = *p;
return(0);
}
static int
ahdi_label (fd, bbsec, label)
int fd;
u_int32_t *bbsec;
struct disklabel *label;
{
struct ahdilabel al;
u_int i, j;
int e;
memset(&al, 0, sizeof(al));
if ((e = ahdi_getparts(fd, AHDI_BBLOCK, AHDI_BBLOCK, &al)))
return(e);
/*
* Perform sanity checks.
*/
if (al.bslst == 0 || al.bslend == 0)
return(1);
if (al.nsecs == 0 || al.nparts == 0)
return(1);
if (al.nparts > AHDI_MAXPARTS)
warnx("Too many AHDI partitions (%u).", al.nparts);
for (i = 0; i < al.nparts; ++i) {
struct ahdi_part *p1 = &al.parts[i];
for (j = 0; j < al.nroots; ++j) {
daddr_t aux = al.roots[j];
if (aux >= p1->ap_st && aux <= p1->ap_end)
return(1);
}
for (j = i + 1; j < al.nparts; ++j) {
struct ahdi_part *p2 = &al.parts[j];
if (p1->ap_st >= p2->ap_st && p1->ap_st <= p2->ap_end)
return(1);
if (p2->ap_st >= p1->ap_st && p2->ap_st <= p1->ap_end)
return(1);
}
if (p1->ap_st >= al.bslst && p1->ap_st <= al.bslend)
return(1);
if (al.bslst >= p1->ap_st && al.bslst <= p1->ap_end)
return(1);
}
/*
* Search for a NetBSD boot block
*/
for (i = 0; i < al.nparts; ++i) {
struct ahdi_part *pd = &al.parts[i];
u_int id = *((u_int32_t *)&pd->ap_flg);
if (id == AHDI_PID_NBD || id == AHDI_PID_RAW) {
off_t offs = pd->ap_st * AHDI_BSIZE;
if ((e = bsd_label(fd, offs, label)) < 0)
return(e);
if (!e) {
*bbsec = pd->ap_st; /* got it */
return(0);
}
}
}
*bbsec = NO_BOOT_BLOCK; /* AHDI label, no NetBSD boot block */
return(0);
}
static int
ahdi_getparts(fd, rsec, esec, alab)
int fd;
daddr_t rsec,
esec;
struct ahdilabel *alab;
{
struct ahdi_part *part, *end;
struct ahdi_root root;
off_t ro;
ro = rsec * AHDI_BSIZE;
if (lseek(fd, ro, SEEK_SET) != ro) {
off_t mend = lseek(fd, 0, SEEK_END);
if (mend == -1 || mend > ro)
return(-1);
return(1);
}
if (read(fd, &root, sizeof(root)) != sizeof(root))
return(-1);
if (rsec == AHDI_BBLOCK)
end = &root.ar_parts[AHDI_MAXRPD];
else end = &root.ar_parts[AHDI_MAXARPD];
for (part = root.ar_parts; part < end; ++part) {
u_int id = *((u_int32_t *)&part->ap_flg);
if (!(id & 0x01000000))
continue;
if ((id &= 0x00ffffff) == AHDI_PID_XGM) {
int e;
daddr_t aux = part->ap_st + esec;
alab->roots = realloc(alab->roots,
(alab->nroots + 1) * sizeof(*alab->roots));
alab->roots[alab->nroots++] = aux;
e = ahdi_getparts(fd, aux,
esec == AHDI_BBLOCK ? aux : esec, alab);
if (e)
return(e);
} else {
struct ahdi_part *p;
alab->parts = realloc(alab->parts,
(alab->nparts + 1) * sizeof(*alab->parts));
p = &alab->parts[alab->nparts++];
*((u_int32_t *)&p->ap_flg) = id;
p->ap_st = part->ap_st + rsec;
p->ap_end = p->ap_st + part->ap_size - 1;
}
}
alab->nsecs = root.ar_hdsize;
alab->bslst = root.ar_bslst;
alab->bslend = root.ar_bslst + root.ar_bslsize - 1;
return(0);
}