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/*-
* Copyright (c) 2003 Jake Burkholder.
* 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.
*
* 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/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/openfirm.h>
#include <dev/ofw/openpromio.h>
/*
* This provides a Solaris compatible character device interface to
* Open Firmware. It exists entirely for compatibility with software
* like X11, and only the features that are actually needed for that
* are implemented. The interface sucks too much to actually use,
* new code should use the /dev/openfirm device.
*/
static d_open_t openprom_open;
static d_close_t openprom_close;
static d_ioctl_t openprom_ioctl;
static int openprom_modevent(module_t mode, int type, void *data);
static int openprom_node_valid(phandle_t node);
static int openprom_node_search(phandle_t root, phandle_t node);
static struct cdevsw openprom_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = openprom_open,
.d_close = openprom_close,
.d_ioctl = openprom_ioctl,
.d_name = "openprom",
};
static int openprom_is_open;
static struct cdev *openprom_dev;
static phandle_t openprom_node;
static int
openprom_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
if (openprom_is_open != 0)
return (EBUSY);
openprom_is_open = 1;
return (0);
}
static int
openprom_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
openprom_is_open = 0;
return (0);
}
static int
openprom_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
struct thread *td)
{
struct openpromio *oprom;
phandle_t node;
uint32_t len;
size_t done;
int proplen;
char *prop;
char *buf;
int error;
if ((flags & FREAD) == 0)
return (EPERM);
prop = buf = NULL;
error = 0;
switch (cmd) {
case OPROMCHILD:
case OPROMNEXT:
if (data == NULL || *(void **)data == NULL)
return (EINVAL);
oprom = *(void **)data;
error = copyin(&oprom->oprom_size, &len, sizeof(len));
if (error != 0)
break;
if (len != sizeof(node)) {
error = EINVAL;
break;
}
error = copyin(&oprom->oprom_array, &node, sizeof(node));
if (error != 0)
break;
error = openprom_node_valid(node);
if (error != 0)
break;
switch (cmd) {
case OPROMCHILD:
node = OF_child(node);
break;
case OPROMNEXT:
node = OF_peer(node);
break;
}
error = copyout(&node, &oprom->oprom_array, sizeof(node));
if (error != 0)
break;
openprom_node = node;
break;
case OPROMGETPROP:
case OPROMNXTPROP:
if (data == NULL || *(void **)data == NULL)
return (EINVAL);
oprom = *(void **)data;
error = copyin(&oprom->oprom_size, &len, sizeof(len));
if (error != 0)
break;
if (len > OPROMMAXPARAM) {
error = EINVAL;
break;
}
prop = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
if (prop == NULL) {
error = ENOMEM;
break;
}
error = copyinstr(&oprom->oprom_array, prop, len, &done);
if (error != 0)
break;
buf = malloc(OPROMMAXPARAM, M_TEMP, M_WAITOK | M_ZERO);
if (buf == NULL) {
error = ENOMEM;
break;
}
node = openprom_node;
switch (cmd) {
case OPROMGETPROP:
proplen = OF_getproplen(node, prop);
if (proplen > OPROMMAXPARAM) {
error = EINVAL;
break;
}
error = OF_getprop(node, prop, buf, proplen);
break;
case OPROMNXTPROP:
error = OF_nextprop(node, prop, buf, OPROMMAXPARAM);
proplen = strlen(buf);
break;
}
if (error != -1) {
error = copyout(&proplen, &oprom->oprom_size,
sizeof(proplen));
if (error == 0)
error = copyout(buf, &oprom->oprom_array,
proplen + 1);
} else
error = EINVAL;
break;
default:
error = ENOIOCTL;
break;
}
if (prop != NULL)
free(prop, M_TEMP);
if (buf != NULL)
free(buf, M_TEMP);
return (error);
}
static int
openprom_node_valid(phandle_t node)
{
if (node == 0)
return (0);
return (openprom_node_search(OF_peer(0), node));
}
static int
openprom_node_search(phandle_t root, phandle_t node)
{
phandle_t child;
if (root == node)
return (0);
for (child = OF_child(root); child != 0 && child != -1;
child = OF_peer(child))
if (openprom_node_search(child, node) == 0)
return (0);
return (EINVAL);
}
static int
openprom_modevent(module_t mode, int type, void *data)
{
switch (type) {
case MOD_LOAD:
openprom_dev = make_dev(&openprom_cdevsw, 0, UID_ROOT,
GID_WHEEL, 0600, "openprom");
return (0);
case MOD_UNLOAD:
destroy_dev(openprom_dev);
return (0);
default:
return (EOPNOTSUPP);
}
}
DEV_MODULE(openprom, openprom_modevent, NULL);
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