diff options
Diffstat (limited to 'sys/dev/efidev/efidev.c')
| -rw-r--r-- | sys/dev/efidev/efidev.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/sys/dev/efidev/efidev.c b/sys/dev/efidev/efidev.c new file mode 100644 index 000000000000..abceec8087d6 --- /dev/null +++ b/sys/dev/efidev/efidev.c @@ -0,0 +1,193 @@ +/*- + * 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, +}; + +/* ARGSUSED */ +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); +} + +int +efidev_init(struct cdev **cdev) +{ + + *cdev = make_dev(&efi_cdevsw, 0, UID_ROOT, GID_WHEEL, 0700, + "efi"); + + return (0); +} + +int +efidev_uninit(struct cdev *cdev) +{ + + destroy_dev(cdev); + + return (0); +} |