275d1554aa
bcopy(x, y, z) -> memcpy(y, x, z) ovbcopy(x, y, z) -> memmove(y, x, z) bcmp(x, y, z) -> memcmp(x, y, z) bzero(x, y) -> memset(x, 0, y)
944 lines
20 KiB
C
944 lines
20 KiB
C
/* $NetBSD: kern_lkm.c,v 1.44 1998/08/04 04:03:12 perry Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1994 Christopher G. Demetriou
|
|
* Copyright (c) 1992 Terrence R. Lambert.
|
|
* 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 Terrence R. Lambert.
|
|
* 4. The name Terrence R. Lambert may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``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 TERRENCE R. LAMBERT 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.
|
|
*/
|
|
|
|
/*
|
|
* XXX it's not really safe to unload *any* of the types which are
|
|
* currently loadable; e.g. you could unload a syscall which was being
|
|
* blocked in, etc. In the long term, a solution should be come up
|
|
* with, but "not right now." -- cgd
|
|
*/
|
|
|
|
#include "opt_uvm.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/file.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/syscallargs.h>
|
|
#include <sys/conf.h>
|
|
|
|
#include <sys/lkm.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_kern.h>
|
|
|
|
#if defined(UVM)
|
|
#include <uvm/uvm_extern.h>
|
|
#endif
|
|
|
|
|
|
#if !defined(DEBUG) && defined(LKMDEBUG)
|
|
# define DEBUG
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
# define LKMDB_INFO 0x01
|
|
# define LKMDB_LOAD 0x02
|
|
int lkmdebug = 0;
|
|
#endif
|
|
|
|
#define PAGESIZE 1024 /* kmem_alloc() allocation quantum */
|
|
|
|
#define LKM_ALLOC 0x01
|
|
#define LKM_WANT 0x02
|
|
|
|
#define LKMS_IDLE 0x00
|
|
#define LKMS_RESERVED 0x01
|
|
#define LKMS_LOADING 0x02
|
|
#define LKMS_LOADED 0x04
|
|
#define LKMS_UNLOADING 0x08
|
|
|
|
static int lkm_v = 0;
|
|
static int lkm_state = LKMS_IDLE;
|
|
|
|
#ifndef MAXLKMS
|
|
#define MAXLKMS 20
|
|
#endif
|
|
|
|
static struct lkm_table lkmods[MAXLKMS]; /* table of loaded modules */
|
|
static struct lkm_table *curp; /* global for in-progress ops */
|
|
|
|
static void lkmunreserve __P((void));
|
|
static int _lkm_syscall __P((struct lkm_table *, int));
|
|
static int _lkm_vfs __P((struct lkm_table *, int));
|
|
static int _lkm_dev __P((struct lkm_table *, int));
|
|
#ifdef STREAMS
|
|
static int _lkm_strmod __P((struct lkm_table *, int));
|
|
#endif
|
|
static int _lkm_exec __P((struct lkm_table *, int));
|
|
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
lkmopen(dev, flag, devtype, p)
|
|
dev_t dev;
|
|
int flag;
|
|
int devtype;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
|
|
if (minor(dev) != 0)
|
|
return (ENXIO); /* bad minor # */
|
|
|
|
/*
|
|
* Use of the loadable kernel module device must be exclusive; we
|
|
* may try to remove this restriction later, but it's really no
|
|
* hardship.
|
|
*/
|
|
while (lkm_v & LKM_ALLOC) {
|
|
if (flag & FNONBLOCK) /* don't hang */
|
|
return (EBUSY);
|
|
lkm_v |= LKM_WANT;
|
|
/*
|
|
* Sleep pending unlock; we use tsleep() to allow
|
|
* an alarm out of the open.
|
|
*/
|
|
error = tsleep((caddr_t)&lkm_v, TTIPRI|PCATCH, "lkmopn", 0);
|
|
if (error)
|
|
return (error); /* leave LKM_WANT set -- no problem */
|
|
}
|
|
lkm_v |= LKM_ALLOC;
|
|
|
|
return (0); /* pseudo-device open */
|
|
}
|
|
|
|
/*
|
|
* Unreserve the memory associated with the current loaded module; done on
|
|
* a coerced close of the lkm device (close on premature exit of modload)
|
|
* or explicitly by modload as a result of a link failure.
|
|
*/
|
|
static void
|
|
lkmunreserve()
|
|
{
|
|
|
|
if (lkm_state == LKMS_IDLE)
|
|
return;
|
|
|
|
/*
|
|
* Actually unreserve the memory
|
|
*/
|
|
if (curp && curp->area) {
|
|
#if defined(UVM)
|
|
uvm_km_free(kernel_map, curp->area, curp->size);/**/
|
|
#else
|
|
/* XXXCDC: unwise to use kmem_map */
|
|
kmem_free(kmem_map, curp->area, curp->size);/**/
|
|
#endif
|
|
curp->area = 0;
|
|
}
|
|
|
|
lkm_state = LKMS_IDLE;
|
|
}
|
|
|
|
int
|
|
lkmclose(dev, flag, mode, p)
|
|
dev_t dev;
|
|
int flag;
|
|
int mode;
|
|
struct proc *p;
|
|
{
|
|
|
|
if (!(lkm_v & LKM_ALLOC)) {
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_INFO)
|
|
printf("LKM: close before open!\n");
|
|
#endif /* DEBUG */
|
|
return (EBADF);
|
|
}
|
|
|
|
/* do this before waking the herd... */
|
|
if (curp && !curp->used) {
|
|
/*
|
|
* If we close before setting used, we have aborted
|
|
* by way of error or by way of close-on-exit from
|
|
* a premature exit of "modload".
|
|
*/
|
|
lkmunreserve(); /* coerce state to LKM_IDLE */
|
|
}
|
|
|
|
lkm_v &= ~LKM_ALLOC;
|
|
wakeup((caddr_t)&lkm_v); /* thundering herd "problem" here */
|
|
|
|
return (0); /* pseudo-device closed */
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
lkmioctl(dev, cmd, data, flag, p)
|
|
dev_t dev;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
struct lmc_resrv *resrvp;
|
|
struct lmc_loadbuf *loadbufp;
|
|
struct lmc_unload *unloadp;
|
|
struct lmc_stat *statp;
|
|
char istr[MAXLKMNAME];
|
|
|
|
switch(cmd) {
|
|
case LMRESERV: /* reserve pages for a module */
|
|
if (securelevel > 0)
|
|
return EPERM;
|
|
|
|
if ((flag & FWRITE) == 0) /* only allow this if writing */
|
|
return EPERM;
|
|
|
|
resrvp = (struct lmc_resrv *)data;
|
|
|
|
/*
|
|
* Find a free slot.
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++)
|
|
if (!lkmods[i].used)
|
|
break;
|
|
if (i == MAXLKMS) {
|
|
error = ENOMEM; /* no slots available */
|
|
break;
|
|
}
|
|
curp = &lkmods[i];
|
|
curp->id = i; /* self reference slot offset */
|
|
|
|
resrvp->slot = i; /* return slot */
|
|
|
|
/*
|
|
* Get memory for module
|
|
*/
|
|
curp->size = resrvp->size;
|
|
|
|
#if defined(UVM)
|
|
curp->area = uvm_km_alloc(kernel_map, curp->size);/**/
|
|
#else
|
|
/* XXXCDC: unwise to use kmem_map */
|
|
curp->area = kmem_alloc(kmem_map, curp->size);/**/
|
|
#endif
|
|
|
|
curp->offset = 0; /* load offset */
|
|
|
|
resrvp->addr = curp->area; /* ret kernel addr */
|
|
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_INFO) {
|
|
printf("LKM: LMRESERV (actual = 0x%08lx)\n",
|
|
curp->area);
|
|
printf("LKM: LMRESERV (adjusted = 0x%08lx)\n",
|
|
trunc_page(curp->area));
|
|
}
|
|
#endif /* DEBUG */
|
|
lkm_state = LKMS_RESERVED;
|
|
break;
|
|
|
|
case LMLOADBUF: /* Copy in; stateful, follows LMRESERV */
|
|
if (securelevel > 0)
|
|
return EPERM;
|
|
|
|
if ((flag & FWRITE) == 0) /* only allow this if writing */
|
|
return EPERM;
|
|
|
|
loadbufp = (struct lmc_loadbuf *)data;
|
|
i = loadbufp->cnt;
|
|
if ((lkm_state != LKMS_RESERVED && lkm_state != LKMS_LOADING)
|
|
|| i < 0
|
|
|| i > MODIOBUF
|
|
|| i > curp->size - curp->offset) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/* copy in buffer full of data */
|
|
error = copyin(loadbufp->data,
|
|
(caddr_t)curp->area + curp->offset, i);
|
|
if (error)
|
|
break;
|
|
|
|
if ((curp->offset + i) < curp->size) {
|
|
lkm_state = LKMS_LOADING;
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_LOAD)
|
|
printf("LKM: LMLOADBUF (loading @ %ld of %ld, i = %d)\n",
|
|
curp->offset, curp->size, i);
|
|
#endif /* DEBUG */
|
|
} else {
|
|
lkm_state = LKMS_LOADED;
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_LOAD)
|
|
printf("LKM: LMLOADBUF (loaded)\n");
|
|
#endif /* DEBUG */
|
|
}
|
|
curp->offset += i;
|
|
break;
|
|
|
|
case LMUNRESRV: /* discard reserved pages for a module */
|
|
if (securelevel > 0)
|
|
return EPERM;
|
|
|
|
if ((flag & FWRITE) == 0) /* only allow this if writing */
|
|
return EPERM;
|
|
|
|
lkmunreserve(); /* coerce state to LKM_IDLE */
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_INFO)
|
|
printf("LKM: LMUNRESERV\n");
|
|
#endif /* DEBUG */
|
|
break;
|
|
|
|
case LMREADY: /* module loaded: call entry */
|
|
if (securelevel > 0)
|
|
return EPERM;
|
|
|
|
if ((flag & FWRITE) == 0) /* only allow this if writing */
|
|
return EPERM;
|
|
|
|
switch (lkm_state) {
|
|
case LKMS_LOADED:
|
|
break;
|
|
case LKMS_LOADING:
|
|
/* The remainder must be bss, so we clear it */
|
|
memset((caddr_t)curp->area + curp->offset, 0,
|
|
curp->size - curp->offset);
|
|
break;
|
|
default:
|
|
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_INFO)
|
|
printf("lkm_state is %02x\n", lkm_state);
|
|
#endif /* DEBUG */
|
|
return ENXIO;
|
|
}
|
|
|
|
curp->entry = (int (*) __P((struct lkm_table *, int, int)))
|
|
(*((long *) (data)));
|
|
|
|
/* call entry(load)... (assigns "private" portion) */
|
|
error = (*(curp->entry))(curp, LKM_E_LOAD, LKM_VERSION);
|
|
if (error) {
|
|
/*
|
|
* Module may refuse loading or may have a
|
|
* version mismatch...
|
|
*/
|
|
lkm_state = LKMS_UNLOADING; /* for lkmunreserve */
|
|
lkmunreserve(); /* free memory */
|
|
curp->used = 0; /* free slot */
|
|
break;
|
|
}
|
|
|
|
curp->used = 1;
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_INFO)
|
|
printf("LKM: LMREADY\n");
|
|
#endif /* DEBUG */
|
|
lkm_state = LKMS_IDLE;
|
|
break;
|
|
|
|
case LMUNLOAD: /* unload a module */
|
|
if (securelevel > 0)
|
|
return EPERM;
|
|
|
|
if ((flag & FWRITE) == 0) /* only allow this if writing */
|
|
return EPERM;
|
|
|
|
unloadp = (struct lmc_unload *)data;
|
|
|
|
if ((i = unloadp->id) == -1) { /* unload by name */
|
|
/*
|
|
* Copy name and lookup id from all loaded
|
|
* modules. May fail.
|
|
*/
|
|
error = copyinstr(unloadp->name, istr, MAXLKMNAME-1,
|
|
NULL);
|
|
if (error)
|
|
break;
|
|
|
|
/*
|
|
* look up id...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
if (!lkmods[i].used)
|
|
continue;
|
|
if (!strcmp(istr,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Range check the value; on failure, return EINVAL
|
|
*/
|
|
if (i < 0 || i >= MAXLKMS) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
curp = &lkmods[i];
|
|
|
|
if (!curp->used) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
|
|
/* call entry(unload) */
|
|
if ((*(curp->entry))(curp, LKM_E_UNLOAD, LKM_VERSION)) {
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
|
|
lkm_state = LKMS_UNLOADING; /* non-idle for lkmunreserve */
|
|
lkmunreserve(); /* free memory */
|
|
curp->used = 0; /* free slot */
|
|
break;
|
|
|
|
case LMSTAT: /* stat a module by id/name */
|
|
/* allow readers and writers to stat */
|
|
|
|
statp = (struct lmc_stat *)data;
|
|
|
|
if ((i = statp->id) == -1) { /* stat by name */
|
|
/*
|
|
* Copy name and lookup id from all loaded
|
|
* modules.
|
|
*/
|
|
copystr(statp->name, istr, MAXLKMNAME-1, (size_t *)0);
|
|
/*
|
|
* look up id...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
if (!lkmods[i].used)
|
|
continue;
|
|
if (!strcmp(istr,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
break;
|
|
}
|
|
|
|
if (i == MAXLKMS) { /* Not found */
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Range check the value; on failure, return EINVAL
|
|
*/
|
|
if (i < 0 || i >= MAXLKMS) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
curp = &lkmods[i];
|
|
|
|
if (!curp->used) { /* Not found */
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Copy out stat information for this module...
|
|
*/
|
|
statp->id = curp->id;
|
|
statp->offset = curp->private.lkm_any->lkm_offset;
|
|
statp->type = curp->private.lkm_any->lkm_type;
|
|
statp->area = curp->area;
|
|
statp->size = curp->size / PAGESIZE;
|
|
statp->private = (unsigned long)curp->private.lkm_any;
|
|
statp->ver = curp->private.lkm_any->lkm_ver;
|
|
copystr(curp->private.lkm_any->lkm_name,
|
|
statp->name,
|
|
MAXLKMNAME - 2,
|
|
(size_t *)0);
|
|
|
|
break;
|
|
|
|
default: /* bad ioctl()... */
|
|
error = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Acts like "nosys" but can be identified in sysent for dynamic call
|
|
* number assignment for a limited number of calls.
|
|
*
|
|
* Place holder for system call slots reserved for loadable modules.
|
|
*/
|
|
int
|
|
sys_lkmnosys(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
|
|
return (sys_nosys(p, v, retval));
|
|
}
|
|
|
|
/*
|
|
* Acts like "enodev", but can be identified in cdevsw and bdevsw for
|
|
* dynamic driver major number assignment for a limited number of
|
|
* drivers.
|
|
*
|
|
* Place holder for device switch slots reserved for loadable modules.
|
|
*/
|
|
int
|
|
lkmenodev()
|
|
{
|
|
|
|
return (enodev());
|
|
}
|
|
|
|
/*
|
|
* A placeholder function for load/unload/stat calls; simply returns zero.
|
|
* Used where people don't want to specify a special function.
|
|
*/
|
|
int
|
|
lkm_nofunc(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
lkmexists(lkmtp)
|
|
struct lkm_table *lkmtp;
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* see if name exists...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
/*
|
|
* An unused module and the one we are testing are not
|
|
* considered.
|
|
*/
|
|
if (!lkmods[i].used || &lkmods[i] == lkmtp)
|
|
continue;
|
|
if (!strcmp(lkmtp->private.lkm_any->lkm_name,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
return (1); /* already loaded... */
|
|
}
|
|
|
|
return (0); /* module not loaded... */
|
|
}
|
|
|
|
/*
|
|
* For the loadable system call described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_syscall(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_syscall *args = lkmtp->private.lkm_syscall;
|
|
int i;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < SYS_MAXSYSCALL; i++)
|
|
if (sysent[i].sy_call == sys_lkmnosys)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == SYS_MAXSYSCALL) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= SYS_MAXSYSCALL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
memcpy(&args->lkm_oldent, &sysent[i], sizeof(struct sysent));
|
|
|
|
/* replace with new */
|
|
memcpy(&sysent[i], args->lkm_sysent, sizeof(struct sysent));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in sysent[] */
|
|
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
/* replace current slot contents with old contents */
|
|
memcpy(&sysent[i], &args->lkm_oldent, sizeof(struct sysent));
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* For the loadable virtual file system described by the structure pointed
|
|
* to by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_vfs(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_vfs *args = lkmtp->private.lkm_vfs;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
/* Establish the file system. */
|
|
if ((error = vfs_attach(args->lkm_vfsops)) != 0)
|
|
return (error);
|
|
|
|
/* done! */
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* Disestablish the file system. */
|
|
if ((error = vfs_detach(args->lkm_vfsops)) != 0)
|
|
return (error);
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* For the loadable device driver described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_dev(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_dev *args = lkmtp->private.lkm_dev;
|
|
int i;
|
|
int error = 0;
|
|
extern int nblkdev, nchrdev; /* from conf.c */
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
switch(args->lkm_devtype) {
|
|
case LM_DT_BLOCK:
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < nblkdev; i++)
|
|
if (bdevsw[i].d_open ==
|
|
(dev_type_open((*))) lkmenodev)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == nblkdev) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= nblkdev) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
memcpy(&args->lkm_olddev.bdev, &bdevsw[i], sizeof(struct bdevsw));
|
|
|
|
/* replace with new */
|
|
memcpy(&bdevsw[i], args->lkm_dev.bdev, sizeof(struct bdevsw));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in bdevsw[] */
|
|
break;
|
|
|
|
case LM_DT_CHAR:
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < nchrdev; i++)
|
|
if (cdevsw[i].d_open ==
|
|
(dev_type_open((*))) lkmenodev)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == nchrdev) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= nchrdev) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
memcpy(&args->lkm_olddev.cdev, &cdevsw[i], sizeof(struct cdevsw));
|
|
|
|
/* replace with new */
|
|
memcpy(&cdevsw[i], args->lkm_dev.cdev, sizeof(struct cdevsw));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in cdevsw[] */
|
|
|
|
break;
|
|
|
|
default:
|
|
error = ENODEV;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
switch(args->lkm_devtype) {
|
|
case LM_DT_BLOCK:
|
|
/* replace current slot contents with old contents */
|
|
memcpy(&bdevsw[i], &args->lkm_olddev.bdev, sizeof(struct bdevsw));
|
|
break;
|
|
|
|
case LM_DT_CHAR:
|
|
/* replace current slot contents with old contents */
|
|
memcpy(&cdevsw[i], &args->lkm_olddev.cdev, sizeof(struct cdevsw));
|
|
break;
|
|
|
|
default:
|
|
error = ENODEV;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifdef STREAMS
|
|
/*
|
|
* For the loadable streams module described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_strmod(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
int i;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#endif /* STREAMS */
|
|
|
|
/*
|
|
* For the loadable execution class described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_exec(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_exec *args = lkmtp->private.lkm_exec;
|
|
int i;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < nexecs; i++)
|
|
if (execsw[i].es_check == NULL)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == nexecs) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= nexecs) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
memcpy(&args->lkm_oldexec, &execsw[i], sizeof(struct execsw));
|
|
|
|
/* replace with new */
|
|
memcpy(&execsw[i], args->lkm_exec, sizeof(struct execsw));
|
|
|
|
/* realize need to recompute max header size */
|
|
exec_maxhdrsz = 0;
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in execsw[] */
|
|
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
/* replace current slot contents with old contents */
|
|
memcpy(&execsw[i], &args->lkm_oldexec, sizeof(struct execsw));
|
|
|
|
/* realize need to recompute max header size */
|
|
exec_maxhdrsz = 0;
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* This code handles the per-module type "wiring-in" of loadable modules
|
|
* into existing kernel tables. For "LM_MISC" modules, wiring and unwiring
|
|
* is assumed to be done in their entry routines internal to the module
|
|
* itself.
|
|
*/
|
|
int
|
|
lkmdispatch(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
int error = 0; /* default = success */
|
|
|
|
switch(lkmtp->private.lkm_any->lkm_type) {
|
|
case LM_SYSCALL:
|
|
error = _lkm_syscall(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_VFS:
|
|
error = _lkm_vfs(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_DEV:
|
|
error = _lkm_dev(lkmtp, cmd);
|
|
break;
|
|
|
|
#ifdef STREAMS
|
|
case LM_STRMOD:
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
}
|
|
break;
|
|
|
|
#endif /* STREAMS */
|
|
|
|
case LM_EXEC:
|
|
error = _lkm_exec(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_MISC: /* ignore content -- no "misc-specific" procedure */
|
|
break;
|
|
|
|
default:
|
|
error = ENXIO; /* unknown type */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|