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/*-
* Copyright (c) 2016 Netflix, Inc.
* 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
* in this position and unchanged.
* 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 ``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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <machine/efi.h>
#include <sys/efiio.h>
static d_ioctl_t efidev_ioctl;
static struct cdevsw efi_cdevsw = {
.d_name = "efi",
.d_version = D_VERSION,
.d_ioctl = efidev_ioctl,
};
static int
efidev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr,
int flags __unused, struct thread *td __unused)
{
int error;
switch (cmd) {
case EFIIOC_GET_TABLE:
{
struct efi_get_table_ioc *egtioc =
(struct efi_get_table_ioc *)addr;
error = efi_get_table(&egtioc->uuid, &egtioc->ptr);
break;
}
case EFIIOC_GET_TIME:
{
struct efi_tm *tm = (struct efi_tm *)addr;
error = efi_get_time(tm);
break;
}
case EFIIOC_SET_TIME:
{
struct efi_tm *tm = (struct efi_tm *)addr;
error = efi_set_time(tm);
break;
}
case EFIIOC_VAR_GET:
{
struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
void *data;
efi_char *name;
data = malloc(ev->datasize, M_TEMP, M_WAITOK);
name = malloc(ev->namesize, M_TEMP, M_WAITOK);
error = copyin(ev->name, name, ev->namesize);
if (error)
goto vg_out;
if (name[ev->namesize / sizeof(efi_char) - 1] != 0) {
error = EINVAL;
goto vg_out;
}
error = efi_var_get(name, &ev->vendor, &ev->attrib,
&ev->datasize, data);
if (error == 0) {
error = copyout(data, ev->data, ev->datasize);
} else if (error == EOVERFLOW) {
/*
* Pass back the size we really need, but
* convert the error to 0 so the copyout
* happens. datasize was updated in the
* efi_var_get call.
*/
ev->data = NULL;
error = 0;
}
vg_out:
free(data, M_TEMP);
free(name, M_TEMP);
break;
}
case EFIIOC_VAR_NEXT:
{
struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
efi_char *name;
name = malloc(ev->namesize, M_TEMP, M_WAITOK);
error = copyin(ev->name, name, ev->namesize);
if (error)
goto vn_out;
/* Note: namesize is the buffer size, not the string lenght */
error = efi_var_nextname(&ev->namesize, name, &ev->vendor);
if (error == 0) {
error = copyout(name, ev->name, ev->namesize);
} else if (error == EOVERFLOW) {
ev->name = NULL;
error = 0;
}
vn_out:
free(name, M_TEMP);
break;
}
case EFIIOC_VAR_SET:
{
struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
void *data = NULL;
efi_char *name;
/* datasize == 0 -> delete (more or less) */
if (ev->datasize > 0)
data = malloc(ev->datasize, M_TEMP, M_WAITOK);
name = malloc(ev->namesize, M_TEMP, M_WAITOK);
if (ev->datasize) {
error = copyin(ev->data, data, ev->datasize);
if (error)
goto vs_out;
}
error = copyin(ev->name, name, ev->namesize);
if (error)
goto vs_out;
if (name[ev->namesize / sizeof(efi_char) - 1] != 0) {
error = EINVAL;
goto vs_out;
}
error = efi_var_set(name, &ev->vendor, ev->attrib, ev->datasize,
data);
vs_out:
free(data, M_TEMP);
free(name, M_TEMP);
break;
}
default:
error = ENOTTY;
break;
}
return (error);
}
static struct cdev *efidev;
static int
efidev_modevents(module_t m, int event, void *arg __unused)
{
struct make_dev_args mda;
int error;
switch (event) {
case MOD_LOAD:
make_dev_args_init(&mda);
mda.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME;
mda.mda_devsw = &efi_cdevsw;
mda.mda_uid = UID_ROOT;
mda.mda_gid = GID_WHEEL;
mda.mda_mode = 0700;
error = make_dev_s(&mda, &efidev, "efi");
return (error);
case MOD_UNLOAD:
if (efidev != NULL)
destroy_dev(efidev);
efidev = NULL;
return (0);
case MOD_SHUTDOWN:
return (0);
default:
return (EOPNOTSUPP);
}
}
static moduledata_t efidev_moddata = {
.name = "efidev",
.evhand = efidev_modevents,
.priv = NULL,
};
DECLARE_MODULE(efidev, efidev_moddata, SI_SUB_DEVFS, SI_ORDER_ANY);
MODULE_VERSION(efidev, 1);
MODULE_DEPEND(efidev, efirt, 1, 1, 1);
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