249 lines
5.9 KiB
C
249 lines
5.9 KiB
C
/*-
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* Copyright (c) 2016 Netflix, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <machine/efi.h>
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#include <sys/efiio.h>
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static d_ioctl_t efidev_ioctl;
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static struct cdevsw efi_cdevsw = {
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.d_name = "efi",
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.d_version = D_VERSION,
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.d_ioctl = efidev_ioctl,
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};
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static int
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efidev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr,
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int flags __unused, struct thread *td __unused)
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{
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int error;
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switch (cmd) {
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case EFIIOC_GET_TABLE:
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{
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struct efi_get_table_ioc *egtioc =
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(struct efi_get_table_ioc *)addr;
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void *buf = NULL;
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error = efi_copy_table(&egtioc->uuid, egtioc->buf ? &buf : NULL,
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egtioc->buf_len, &egtioc->table_len);
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if (error != 0 || egtioc->buf == NULL)
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break;
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if (egtioc->buf_len < egtioc->table_len) {
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error = EINVAL;
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free(buf, M_TEMP);
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break;
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}
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error = copyout(buf, egtioc->buf, egtioc->buf_len);
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free(buf, M_TEMP);
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break;
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}
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case EFIIOC_GET_TIME:
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{
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struct efi_tm *tm = (struct efi_tm *)addr;
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error = efi_get_time(tm);
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break;
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}
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case EFIIOC_SET_TIME:
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{
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struct efi_tm *tm = (struct efi_tm *)addr;
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error = efi_set_time(tm);
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break;
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}
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case EFIIOC_GET_WAKETIME:
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{
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struct efi_waketime_ioc *wt = (struct efi_waketime_ioc *)addr;
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error = efi_get_waketime(&wt->enabled, &wt->pending,
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&wt->waketime);
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break;
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}
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case EFIIOC_SET_WAKETIME:
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{
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struct efi_waketime_ioc *wt = (struct efi_waketime_ioc *)addr;
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error = efi_set_waketime(wt->enabled, &wt->waketime);
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break;
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}
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case EFIIOC_VAR_GET:
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{
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struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
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void *data;
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efi_char *name;
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data = malloc(ev->datasize, M_TEMP, M_WAITOK);
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name = malloc(ev->namesize, M_TEMP, M_WAITOK);
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error = copyin(ev->name, name, ev->namesize);
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if (error)
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goto vg_out;
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if (name[ev->namesize / sizeof(efi_char) - 1] != 0) {
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error = EINVAL;
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goto vg_out;
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}
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error = efi_var_get(name, &ev->vendor, &ev->attrib,
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&ev->datasize, data);
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if (error == 0) {
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error = copyout(data, ev->data, ev->datasize);
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} else if (error == EOVERFLOW) {
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/*
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* Pass back the size we really need, but
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* convert the error to 0 so the copyout
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* happens. datasize was updated in the
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* efi_var_get call.
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*/
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ev->data = NULL;
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error = 0;
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}
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vg_out:
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free(data, M_TEMP);
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free(name, M_TEMP);
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break;
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}
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case EFIIOC_VAR_NEXT:
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{
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struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
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efi_char *name;
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name = malloc(ev->namesize, M_TEMP, M_WAITOK);
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error = copyin(ev->name, name, ev->namesize);
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if (error)
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goto vn_out;
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/* Note: namesize is the buffer size, not the string lenght */
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error = efi_var_nextname(&ev->namesize, name, &ev->vendor);
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if (error == 0) {
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error = copyout(name, ev->name, ev->namesize);
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} else if (error == EOVERFLOW) {
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ev->name = NULL;
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error = 0;
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}
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vn_out:
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free(name, M_TEMP);
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break;
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}
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case EFIIOC_VAR_SET:
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{
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struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
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void *data = NULL;
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efi_char *name;
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/* datasize == 0 -> delete (more or less) */
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if (ev->datasize > 0)
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data = malloc(ev->datasize, M_TEMP, M_WAITOK);
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name = malloc(ev->namesize, M_TEMP, M_WAITOK);
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if (ev->datasize) {
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error = copyin(ev->data, data, ev->datasize);
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if (error)
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goto vs_out;
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}
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error = copyin(ev->name, name, ev->namesize);
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if (error)
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goto vs_out;
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if (name[ev->namesize / sizeof(efi_char) - 1] != 0) {
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error = EINVAL;
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goto vs_out;
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}
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error = efi_var_set(name, &ev->vendor, ev->attrib, ev->datasize,
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data);
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vs_out:
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free(data, M_TEMP);
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free(name, M_TEMP);
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break;
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}
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default:
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error = ENOTTY;
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break;
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}
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return (error);
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}
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static struct cdev *efidev;
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static int
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efidev_modevents(module_t m, int event, void *arg __unused)
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{
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struct make_dev_args mda;
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int error;
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switch (event) {
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case MOD_LOAD:
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/*
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* If we have no efi environment, then don't create the device.
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*/
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if (efi_rt_ok() != 0)
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return (0);
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make_dev_args_init(&mda);
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mda.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME;
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mda.mda_devsw = &efi_cdevsw;
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mda.mda_uid = UID_ROOT;
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mda.mda_gid = GID_WHEEL;
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mda.mda_mode = 0700;
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error = make_dev_s(&mda, &efidev, "efi");
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return (error);
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case MOD_UNLOAD:
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if (efidev != NULL)
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destroy_dev(efidev);
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efidev = NULL;
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return (0);
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case MOD_SHUTDOWN:
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return (0);
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default:
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return (EOPNOTSUPP);
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}
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}
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static moduledata_t efidev_moddata = {
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.name = "efidev",
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.evhand = efidev_modevents,
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.priv = NULL,
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};
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DECLARE_MODULE(efidev, efidev_moddata, SI_SUB_DRIVERS, SI_ORDER_ANY);
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MODULE_VERSION(efidev, 1);
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MODULE_DEPEND(efidev, efirt, 1, 1, 1);
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