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/* $NetBSD: openfirmio.c,v 1.4 2002/09/06 13:23:19 gehenna Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/ofw/openfirmio.c 194138 2009-06-14 00:05:38Z marius $");
/*-
* 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.
* 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.
*
* @(#)openfirm.c 8.1 (Berkeley) 6/11/93
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <dev/ofw/openfirmio.h>
static struct cdev *openfirm_dev;
static d_ioctl_t openfirm_ioctl;
#define OPENFIRM_MINOR 0
static struct cdevsw openfirm_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_ioctl = openfirm_ioctl,
.d_name = "openfirm",
};
static phandle_t lastnode; /* speed hack */
static int openfirm_checkid(phandle_t, phandle_t);
static int openfirm_getstr(int, const char *, char **);
/*
* Verify target ID is valid (exists in the OPENPROM tree), as
* listed from node ID sid forward.
*/
static int
openfirm_checkid(phandle_t sid, phandle_t tid)
{
for (; sid != 0; sid = OF_peer(sid))
if (sid == tid || openfirm_checkid(OF_child(sid), tid))
return (1);
return (0);
}
static int
openfirm_getstr(int len, const char *user, char **cpp)
{
int error;
char *cp;
/* Reject obvious bogus requests. */
if ((u_int)len > OFIOCMAXNAME)
return (ENAMETOOLONG);
*cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK);
if (cp == NULL)
return (ENOMEM);
error = copyin(user, cp, len);
cp[len] = '\0';
return (error);
}
int
openfirm_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
struct thread *td)
{
struct ofiocdesc *of;
phandle_t node;
int len, ok, error;
char *name, *value;
char newname[32];
if ((flags & FREAD) == 0)
return (EBADF);
of = (struct ofiocdesc *)data;
switch (cmd) {
case OFIOCGETOPTNODE:
*(phandle_t *) data = OF_finddevice("/options");
return (0);
case OFIOCGET:
case OFIOCSET:
case OFIOCNEXTPROP:
case OFIOCFINDDEVICE:
case OFIOCGETPROPLEN:
node = of->of_nodeid;
break;
case OFIOCGETNEXT:
case OFIOCGETCHILD:
node = *(phandle_t *)data;
break;
default:
return (ENOIOCTL);
}
if (node != 0 && node != lastnode) {
/* Not an easy one, we must search for it. */
ok = openfirm_checkid(OF_peer(0), node);
if (!ok)
return (EINVAL);
lastnode = node;
}
name = value = NULL;
error = 0;
switch (cmd) {
case OFIOCGET:
case OFIOCGETPROPLEN:
if (node == 0)
return (EINVAL);
error = openfirm_getstr(of->of_namelen, of->of_name, &name);
if (error)
break;
len = OF_getproplen(node, name);
if (cmd == OFIOCGETPROPLEN) {
of->of_buflen = len;
break;
}
if (len > of->of_buflen) {
error = ENOMEM;
break;
}
of->of_buflen = len;
/* -1 means no entry; 0 means no value. */
if (len <= 0)
break;
value = malloc(len, M_TEMP, M_WAITOK);
if (value == NULL) {
error = ENOMEM;
break;
}
len = OF_getprop(node, name, (void *)value, len);
error = copyout(value, of->of_buf, len);
break;
case OFIOCSET:
/*
* Note: Text string values for at least the /options node
* have to be null-terminated and the length parameter must
* include this terminating null. However, like OF_getprop(),
* OF_setprop() will return the actual length of the text
* string, i.e. omitting the terminating null.
*/
if ((flags & FWRITE) == 0)
return (EBADF);
if (node == 0)
return (EINVAL);
if ((u_int)of->of_buflen > OFIOCMAXVALUE)
return (ENAMETOOLONG);
error = openfirm_getstr(of->of_namelen, of->of_name, &name);
if (error)
break;
value = malloc(of->of_buflen, M_TEMP, M_WAITOK);
if (value == NULL) {
error = ENOMEM;
break;
}
error = copyin(of->of_buf, value, of->of_buflen);
if (error)
break;
len = OF_setprop(node, name, value, of->of_buflen);
if (len < 0)
error = EINVAL;
of->of_buflen = len;
break;
case OFIOCNEXTPROP:
if (node == 0 || of->of_buflen < 0)
return (EINVAL);
if (of->of_namelen != 0) {
error = openfirm_getstr(of->of_namelen, of->of_name,
&name);
if (error)
break;
}
ok = OF_nextprop(node, name, newname, sizeof(newname));
if (ok == 0) {
error = ENOENT;
break;
}
if (ok == -1) {
error = EINVAL;
break;
}
len = strlen(newname) + 1;
if (len > of->of_buflen)
len = of->of_buflen;
else
of->of_buflen = len;
error = copyout(newname, of->of_buf, len);
break;
case OFIOCGETNEXT:
node = OF_peer(node);
*(phandle_t *)data = lastnode = node;
break;
case OFIOCGETCHILD:
if (node == 0)
return (EINVAL);
node = OF_child(node);
*(phandle_t *)data = lastnode = node;
break;
case OFIOCFINDDEVICE:
error = openfirm_getstr(of->of_namelen, of->of_name, &name);
if (error)
break;
node = OF_finddevice(name);
if (node == 0 || node == -1) {
error = ENOENT;
break;
}
of->of_nodeid = lastnode = node;
break;
}
if (name != NULL)
free(name, M_TEMP);
if (value != NULL)
free(value, M_TEMP);
return (error);
}
static int
openfirm_modevent(module_t mod, int type, void *data)
{
switch(type) {
case MOD_LOAD:
if (bootverbose)
printf("openfirm: <Open Firmware control device>\n");
/*
* Allow only root access by default; this device may allow
* users to peek into firmware passwords, and likely to crash
* the machine on some boxen due to firmware quirks.
*/
openfirm_dev = make_dev(&openfirm_cdevsw, OPENFIRM_MINOR,
UID_ROOT, GID_WHEEL, 0600, "openfirm");
return 0;
case MOD_UNLOAD:
destroy_dev(openfirm_dev);
return 0;
case MOD_SHUTDOWN:
return 0;
default:
return EOPNOTSUPP;
}
}
DEV_MODULE(openfirm, openfirm_modevent, NULL);