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NetBSD/sys/kern/kern_subr.c

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/* $NetBSD: kern_subr.c,v 1.41 1998/08/04 04:03:14 perry Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)kern_subr.c 8.4 (Berkeley) 2/14/95
*/
#include "opt_uvm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/device.h>
#include <sys/reboot.h>
#include <sys/conf.h>
#include <sys/disklabel.h>
#include <sys/queue.h>
#include <dev/cons.h>
#include <net/if.h>
/* XXX these should eventually move to subr_autoconf.c */
static int findblkmajor __P((const char *, struct devnametobdevmaj *));
static const char *findblkname __P((int, struct devnametobdevmaj *));
static struct device *getdisk __P((char *, int, int,
struct devnametobdevmaj *, dev_t *, int));
static struct device *parsedisk __P((char *, int, int,
struct devnametobdevmaj *, dev_t *));
static int getstr __P((char *, int));
int
uiomove(buf, n, uio)
register void *buf;
register int n;
register struct uio *uio;
{
register struct iovec *iov;
u_int cnt;
int error = 0;
char *cp = buf;
#ifdef DIAGNOSTIC
if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
panic("uiomove: mode");
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
panic("uiomove proc");
#endif
while (n > 0 && uio->uio_resid) {
iov = uio->uio_iov;
cnt = iov->iov_len;
if (cnt == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
continue;
}
if (cnt > n)
cnt = n;
switch (uio->uio_segflg) {
case UIO_USERSPACE:
if (uio->uio_rw == UIO_READ)
error = copyout(cp, iov->iov_base, cnt);
else
error = copyin(iov->iov_base, cp, cnt);
if (error)
return (error);
break;
case UIO_SYSSPACE:
#if defined(UVM)
if (uio->uio_rw == UIO_READ)
error = kcopy(cp, iov->iov_base, cnt);
else
error = kcopy(iov->iov_base, cp, cnt);
if (error)
return(error);
#else
if (uio->uio_rw == UIO_READ)
memcpy(iov->iov_base, cp, cnt);
else
memcpy(cp, iov->iov_base, cnt);
#endif
break;
}
(caddr_t)iov->iov_base += cnt;
iov->iov_len -= cnt;
uio->uio_resid -= cnt;
uio->uio_offset += cnt;
cp += cnt;
n -= cnt;
}
return (error);
}
/*
* Give next character to user as result of read.
*/
int
ureadc(c, uio)
register int c;
register struct uio *uio;
{
register struct iovec *iov;
if (uio->uio_resid <= 0)
panic("ureadc: non-positive resid");
again:
if (uio->uio_iovcnt <= 0)
panic("ureadc: non-positive iovcnt");
iov = uio->uio_iov;
if (iov->iov_len <= 0) {
uio->uio_iovcnt--;
uio->uio_iov++;
goto again;
}
switch (uio->uio_segflg) {
case UIO_USERSPACE:
if (subyte(iov->iov_base, c) < 0)
return (EFAULT);
break;
case UIO_SYSSPACE:
*(char *)iov->iov_base = c;
break;
}
((caddr_t)iov->iov_base)++;
iov->iov_len--;
uio->uio_resid--;
uio->uio_offset++;
return (0);
}
/*
* General routine to allocate a hash table.
*/
void *
hashinit(elements, type, flags, hashmask)
int elements, type, flags;
u_long *hashmask;
{
long hashsize;
LIST_HEAD(generic, generic) *hashtbl;
int i;
if (elements <= 0)
panic("hashinit: bad cnt");
for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
continue;
hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, flags);
for (i = 0; i < hashsize; i++)
LIST_INIT(&hashtbl[i]);
*hashmask = hashsize - 1;
return (hashtbl);
}
/*
* "Shutdown hook" types, functions, and variables.
*/
struct shutdownhook_desc {
LIST_ENTRY(shutdownhook_desc) sfd_list;
void (*sfd_fn) __P((void *));
void *sfd_arg;
};
LIST_HEAD(, shutdownhook_desc) shutdownhook_list;
void *
shutdownhook_establish(fn, arg)
void (*fn) __P((void *));
void *arg;
{
struct shutdownhook_desc *ndp;
ndp = (struct shutdownhook_desc *)
malloc(sizeof(*ndp), M_DEVBUF, M_NOWAIT);
if (ndp == NULL)
return NULL;
ndp->sfd_fn = fn;
ndp->sfd_arg = arg;
LIST_INSERT_HEAD(&shutdownhook_list, ndp, sfd_list);
return (ndp);
}
void
shutdownhook_disestablish(vhook)
void *vhook;
{
#ifdef DIAGNOSTIC
struct shutdownhook_desc *dp;
for (dp = shutdownhook_list.lh_first; dp != NULL;
dp = dp->sfd_list.le_next)
if (dp == vhook)
break;
if (dp == NULL)
panic("shutdownhook_disestablish: hook not established");
#endif
LIST_REMOVE((struct shutdownhook_desc *)vhook, sfd_list);
free(vhook, M_DEVBUF);
}
/*
* Run shutdown hooks. Should be invoked immediately before the
* system is halted or rebooted, i.e. after file systems unmounted,
* after crash dump done, etc.
*
* Each shutdown hook is removed from the list before it's run, so that
* it won't be run again.
*/
void
doshutdownhooks()
{
struct shutdownhook_desc *dp;
while ((dp = shutdownhook_list.lh_first) != NULL) {
LIST_REMOVE(dp, sfd_list);
(*dp->sfd_fn)(dp->sfd_arg);
#if 0
/*
* Don't bother freeing the hook structure,, since we may
* be rebooting because of a memory corruption problem,
* and this might only make things worse. It doesn't
* matter, anyway, since the system is just about to
* reboot.
*/
free(dp, M_DEVBUF);
#endif
}
}
/*
* "Mountroot hook" types, functions, and variables.
*/
struct mountroothook_desc {
LIST_ENTRY(mountroothook_desc) mrd_list;
struct device *mrd_device;
void (*mrd_func) __P((struct device *));
};
LIST_HEAD(, mountroothook_desc) mountroothook_list;
void *
mountroothook_establish(func, dev)
void (*func) __P((struct device *));
struct device *dev;
{
struct mountroothook_desc *mrd;
mrd = (struct mountroothook_desc *)
malloc(sizeof(*mrd), M_DEVBUF, M_NOWAIT);
if (mrd == NULL)
return (NULL);
mrd->mrd_device = dev;
mrd->mrd_func = func;
LIST_INSERT_HEAD(&mountroothook_list, mrd, mrd_list);
return (mrd);
}
void
mountroothook_disestablish(vhook)
void *vhook;
{
#ifdef DIAGNOSTIC
struct mountroothook_desc *mrd;
for (mrd = mountroothook_list.lh_first; mrd != NULL;
mrd = mrd->mrd_list.le_next)
if (mrd == vhook)
break;
if (mrd == NULL)
panic("mountroothook_disestablish: hook not established");
#endif
LIST_REMOVE((struct mountroothook_desc *)vhook, mrd_list);
free(vhook, M_DEVBUF);
}
void
mountroothook_destroy()
{
struct mountroothook_desc *mrd;
while ((mrd = mountroothook_list.lh_first) != NULL) {
LIST_REMOVE(mrd, mrd_list);
free(mrd, M_DEVBUF);
}
}
void
domountroothook()
{
struct mountroothook_desc *mrd;
for (mrd = mountroothook_list.lh_first; mrd != NULL;
mrd = mrd->mrd_list.le_next) {
if (mrd->mrd_device == root_device) {
(*mrd->mrd_func)(root_device);
return;
}
}
}
/*
* Determine the root device and, if instructed to, the root file system.
*/
#include "md.h"
#if NMD == 0
#undef MEMORY_DISK_HOOKS
#endif
#ifdef MEMORY_DISK_HOOKS
static struct device fakemdrootdev[NMD];
#endif
void
setroot(bootdv, bootpartition, nam2blk)
struct device *bootdv;
int bootpartition;
struct devnametobdevmaj *nam2blk;
{
struct device *dv;
int len, print_newline = 0;
#ifdef MEMORY_DISK_HOOKS
int i;
#endif
dev_t nrootdev;
dev_t ndumpdev = NODEV;
char buf[128];
const char *rootdevname;
const char *dumpdevname;
struct device *rootdv = NULL; /* XXX gcc -Wuninitialized */
struct device *dumpdv = NULL;
struct ifnet *ifp;
const char *deffsname;
struct vfsops *vops;
extern int (*mountroot) __P((void));
static struct devnametobdevmaj *last_nam2blk;
if (nam2blk == NULL) {
if (last_nam2blk == NULL)
panic("setroot: no name to bdev major map");
nam2blk = last_nam2blk;
}
last_nam2blk = nam2blk;
#ifdef MEMORY_DISK_HOOKS
for (i = 0; i < NMD; i++) {
fakemdrootdev[i].dv_class = DV_DISK;
fakemdrootdev[i].dv_cfdata = NULL;
fakemdrootdev[i].dv_unit = i;
fakemdrootdev[i].dv_parent = NULL;
sprintf(fakemdrootdev[i].dv_xname, "md%d", i);
}
#endif /* MEMORY_DISK_HOOKS */
#ifdef MEMORY_DISK_IS_ROOT
bootdv = &fakemdrootdev[0];
bootpartition = 0;
#endif
/*
* If NFS is specified as the file system, and we found
* a DV_DISK boot device (or no boot device at all), then
* find a reasonable network interface for "rootspec".
*/
vops = vfs_getopsbyname("nfs");
if (vops != NULL && vops->vfs_mountroot == mountroot &&
rootspec == NULL &&
(bootdv == NULL || bootdv->dv_class != DV_IFNET)) {
for (ifp = ifnet.tqh_first; ifp != NULL;
ifp = ifp->if_list.tqe_next)
if ((ifp->if_flags &
(IFF_LOOPBACK|IFF_POINTOPOINT)) == 0)
break;
if (ifp == NULL) {
/*
* Can't find a suitable interface; ask the
* user.
*/
boothowto |= RB_ASKNAME;
} else {
/*
* Have a suitable interface; behave as if
* the user specified this interface.
*/
rootspec = (const char *)ifp->if_xname;
}
}
/*
* If wildcarded root and we the boot device wasn't determined,
* ask the user.
*/
if (rootspec == NULL && bootdv == NULL)
boothowto |= RB_ASKNAME;
top:
if (boothowto & RB_ASKNAME) {
struct device *defdumpdv;
for (;;) {
printf("root device");
if (bootdv != NULL) {
printf(" (default %s", bootdv->dv_xname);
if (bootdv->dv_class == DV_DISK)
printf("%c", bootpartition + 'a');
printf(")");
}
printf(": ");
len = getstr(buf, sizeof(buf));
if (len == 0 && bootdv != NULL) {
strcpy(buf, bootdv->dv_xname);
len = strlen(buf);
}
if (len > 0 && buf[len - 1] == '*') {
buf[--len] = '\0';
dv = getdisk(buf, len, 1, nam2blk,
&nrootdev, 0);
if (dv != NULL) {
rootdv = dv;
break;
}
}
dv = getdisk(buf, len, bootpartition, nam2blk,
&nrootdev, 0);
if (dv != NULL) {
rootdv = dv;
break;
}
}
/*
* Set up the default dump device. If root is on
* a network device, there is no default dump
* device, since we don't support dumps to the
* network.
*/
if (rootdv->dv_class == DV_IFNET)
defdumpdv = NULL;
else
defdumpdv = rootdv;
for (;;) {
printf("dump device");
if (defdumpdv != NULL) {
/*
* Note, we know it's a disk if we get here.
*/
printf(" (default %sb)", defdumpdv->dv_xname);
}
printf(": ");
len = getstr(buf, sizeof(buf));
if (len == 0) {
if (defdumpdv != NULL) {
ndumpdev = MAKEDISKDEV(major(nrootdev),
DISKUNIT(nrootdev), 1);
}
if (rootdv->dv_class == DV_IFNET)
dumpdv = NULL;
else
dumpdv = rootdv;
break;
}
if (len == 4 && strcmp(buf, "none") == 0) {
dumpspec = "none";
goto havedump;
}
dv = getdisk(buf, len, 1, nam2blk, &ndumpdev, 1);
if (dv) {
dumpdv = dv;
break;
}
}
havedump:
rootdev = nrootdev;
dumpdev = ndumpdev;
for (vops = LIST_FIRST(&vfs_list); vops != NULL;
vops = LIST_NEXT(vops, vfs_list)) {
if (vops->vfs_mountroot != NULL &&
vops->vfs_mountroot == mountroot)
break;
}
if (vops == NULL) {
mountroot = NULL;
deffsname = "generic";
} else
deffsname = vops->vfs_name;
for (;;) {
printf("file system (default %s): ", deffsname);
len = getstr(buf, sizeof(buf));
if (len == 0)
break;
if (len == 4 && strcmp(buf, "halt") == 0)
cpu_reboot(RB_HALT, NULL);
else if (len == 7 && strcmp(buf, "generic") == 0) {
mountroot = NULL;
break;
}
vops = vfs_getopsbyname(buf);
if (vops == NULL || vops->vfs_mountroot == NULL) {
printf("use one of: generic");
for (vops = LIST_FIRST(&vfs_list);
vops != NULL;
vops = LIST_NEXT(vops, vfs_list)) {
if (vops->vfs_mountroot != NULL)
printf(" %s", vops->vfs_name);
}
printf(" halt\n");
} else {
mountroot = vops->vfs_mountroot;
break;
}
}
} else if (rootspec == NULL) {
int majdev;
/*
* Wildcarded root; use the boot device.
*/
rootdv = bootdv;
majdev = findblkmajor(bootdv->dv_xname, nam2blk);
if (majdev >= 0) {
/*
* Root is on a disk. `bootpartition' is root.
*/
rootdev = MAKEDISKDEV(majdev, bootdv->dv_unit,
bootpartition);
}
} else {
/*
* `root on <dev> ...'
*/
/*
* If it's a network interface, we can bail out
* early.
*/
for (dv = alldevs.tqh_first; dv != NULL;
dv = dv->dv_list.tqe_next)
if (strcmp(dv->dv_xname, rootspec) == 0)
break;
if (dv != NULL && dv->dv_class == DV_IFNET) {
rootdv = dv;
goto haveroot;
}
rootdevname = findblkname(major(rootdev), nam2blk);
if (rootdevname == NULL) {
printf("unknown device major 0x%x\n", rootdev);
boothowto |= RB_ASKNAME;
goto top;
}
memset(buf, 0, sizeof(buf));
sprintf(buf, "%s%d", rootdevname, DISKUNIT(rootdev));
for (dv = alldevs.tqh_first; dv != NULL;
dv = dv->dv_list.tqe_next) {
if (strcmp(buf, dv->dv_xname) == 0) {
rootdv = dv;
break;
}
}
if (rootdv == NULL) {
printf("device %s (0x%x) not configured\n",
buf, rootdev);
boothowto |= RB_ASKNAME;
goto top;
}
}
haveroot:
root_device = rootdv;
switch (rootdv->dv_class) {
case DV_IFNET:
/* Nothing. */
break;
case DV_DISK:
printf("root on %s%c", rootdv->dv_xname,
DISKPART(rootdev) + 'a');
print_newline = 1;
break;
default:
printf("can't determine root device\n");
boothowto |= RB_ASKNAME;
goto top;
}
/*
* Now configure the dump device.
*/
if (dumpspec != NULL && strcmp(dumpspec, "none") == 0) {
/*
* Operator doesn't want a dump device.
*/
goto nodumpdev;
}
/*
* If we haven't figured out the dump device, do so, with
* the following rules:
*
* (a) We already know dumpdv in the RB_ASKNAME case.
*
* (b) If dumpspec is set, try to use it. If the device
* is not available, punt.
*
* (c) If dumpspec is not set, the dump device is
* wildcarded or unspecified. If the root device
* is DV_IFNET, punt. Otherwise, use partition b
* of the root device.
*/
if (boothowto & RB_ASKNAME) {
if (dumpdv == NULL) {
/*
* Just return; dumpdev is already set to NODEV
* and we don't want to print a newline in this
* case.
*/
return;
}
goto out;
}
if (dumpspec != NULL) {
if (dumpdev == NODEV) {
/*
* Looks like they tried to pick a network
* device. Oops.
*/
goto nodumpdev;
}
dumpdevname = findblkname(major(dumpdev), nam2blk);
if (dumpdevname == NULL)
goto nodumpdev;
memset(buf, 0, sizeof(buf));
sprintf(buf, "%s%d", dumpdevname, DISKUNIT(dumpdev));
for (dv = alldevs.tqh_first; dv != NULL;
dv = dv->dv_list.tqe_next) {
if (strcmp(buf, dv->dv_xname) == 0) {
dumpdv = dv;
break;
}
}
if (dv == NULL) {
/*
* Device not configured.
*/
goto nodumpdev;
}
} else if (rootdv->dv_class == DV_IFNET)
goto nodumpdev;
else {
dumpdv = rootdv;
dumpdev = MAKEDISKDEV(major(rootdev), dumpdv->dv_unit, 1);
}
out:
printf(" dumps on %s%c\n", dumpdv->dv_xname, DISKPART(dumpdev) + 'a');
return;
nodumpdev:
dumpdev = NODEV;
if (print_newline)
printf("\n");
}
static int
findblkmajor(name, nam2blk)
const char *name;
struct devnametobdevmaj *nam2blk;
{
int i;
if (nam2blk == NULL)
return (-1);
for (i = 0; nam2blk[i].d_name != NULL; i++)
if (strncmp(name, nam2blk[i].d_name,
strlen(nam2blk[i].d_name)) == 0)
return (nam2blk[i].d_maj);
return (-1);
}
const char *
findblkname(maj, nam2blk)
int maj;
struct devnametobdevmaj *nam2blk;
{
int i;
if (nam2blk == NULL)
return (NULL);
for (i = 0; nam2blk[i].d_name != NULL; i++)
if (nam2blk[i].d_maj == maj)
return (nam2blk[i].d_name);
return (NULL);
}
static struct device *
getdisk(str, len, defpart, nam2blk, devp, isdump)
char *str;
int len, defpart;
struct devnametobdevmaj *nam2blk;
dev_t *devp;
int isdump;
{
struct device *dv;
#ifdef MEMORY_DISK_HOOKS
int i;
#endif
if ((dv = parsedisk(str, len, defpart, nam2blk, devp)) == NULL) {
printf("use one of:");
#ifdef MEMORY_DISK_HOOKS
if (isdump == 0)
for (i = 0; i < NMD; i++)
printf(" %s[a-%c]", fakemdrootdev[i].dv_xname,
'a' + MAXPARTITIONS - 1);
#endif
for (dv = alldevs.tqh_first; dv != NULL;
dv = dv->dv_list.tqe_next) {
if (dv->dv_class == DV_DISK)
printf(" %s[a-%c]", dv->dv_xname,
'a' + MAXPARTITIONS - 1);
if (isdump == 0 && dv->dv_class == DV_IFNET)
printf(" %s", dv->dv_xname);
}
if (isdump)
printf(" none");
printf(" halt\n");
}
return (dv);
}
static struct device *
parsedisk(str, len, defpart, nam2blk, devp)
char *str;
int len, defpart;
struct devnametobdevmaj *nam2blk;
dev_t *devp;
{
struct device *dv;
char *cp, c;
int majdev, part;
#ifdef MEMORY_DISK_HOOKS
int i;
#endif
if (len == 0)
return (NULL);
if (len == 4 && strcmp(str, "halt") == 0)
cpu_reboot(RB_HALT, NULL);
cp = str + len - 1;
c = *cp;
if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) {
part = c - 'a';
*cp = '\0';
} else
part = defpart;
#ifdef MEMORY_DISK_HOOKS
for (i = 0; i < NMD; i++)
if (strcmp(str, fakemdrootdev[i].dv_xname) == 0) {
dv = &fakemdrootdev[i];
goto gotdisk;
}
#endif
for (dv = alldevs.tqh_first; dv != NULL; dv = dv->dv_list.tqe_next) {
if (dv->dv_class == DV_DISK &&
strcmp(str, dv->dv_xname) == 0) {
#ifdef MEMORY_DISK_HOOKS
gotdisk:
#endif
majdev = findblkmajor(dv->dv_xname, nam2blk);
if (majdev < 0)
panic("parsedisk");
*devp = MAKEDISKDEV(majdev, dv->dv_unit, part);
break;
}
if (dv->dv_class == DV_IFNET &&
strcmp(str, dv->dv_xname) == 0) {
*devp = NODEV;
break;
}
}
*cp = c;
return (dv);
}
/*
* XXX shouldn't this be a common function?
*/
static int
getstr(cp, size)
char *cp;
int size;
{
char *lp;
int c, len;
cnpollc(1);
lp = cp;
len = 0;
for (;;) {
c = cngetc();
switch (c) {
case '\n':
case '\r':
printf("\n");
*lp++ = '\0';
cnpollc(0);
return (len);
case '\b':
case '\177':
case '#':
if (len) {
--len;
--lp;
printf("\b \b");
}
continue;
case '@':
case 'u'&037:
len = 0;
lp = cp;
printf("\n");
continue;
default:
if (len + 1 >= size || c < ' ') {
printf("\007");
continue;
}
printf("%c", c);
++len;
*lp++ = c;
}
}
}
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