On Tue, Oct 11, 2016 at 10:24:30PM +0000, Warner Losh wrote:

> Added: head/sys/dev/efidev/efidev.c
> ==============================================================================
> --- /dev/null 00:00:00 1970   (empty, because file is newly added)
> +++ head/sys/dev/efidev/efidev.c      Tue Oct 11 22:24:30 2016        
> (r307070)
> @@ -0,0 +1,199 @@
> +/*-
> + * 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>
As I asked in review, please use <sys/efi.h>, not <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);
> +             if (name == NULL) {
The check is for impossible condition.

> +                     error = ENOMEM;
> +                     goto vn_out;
> +             }
> +             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:
> +             if (name != NULL)
The check is redundand.

> +                     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:
> +             if (data != NULL)
The check is redundand.

> +                     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,
> +         "efidev");
It is still "/dev/efidev".  Please rename as discussed.

> +
> +     return (0);
> +}
> +
> +int
> +efidev_uninit(struct cdev *cdev)
> +{
> +     
> +     destroy_dev(cdev);
> +
> +     return (0);
> +}
> 
> Added: head/sys/i386/include/efi.h
> ==============================================================================
> --- /dev/null 00:00:00 1970   (empty, because file is newly added)
> +++ head/sys/i386/include/efi.h       Tue Oct 11 22:24:30 2016        
> (r307070)
> @@ -0,0 +1,39 @@
> +/*-
> + * Copyright (c) 2016 The FreeBSD Foundation
> + * All rights reserved.
> + *
> + * This software was developed by Konstantin Belousov <k...@freebsd.org>
> + * under sponsorship from the FreeBSD Foundation.
It was not.

> + *
> + * 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.
> + *
> + * $FreeBSD$
> + */
> +
> +#ifndef __I386_INCLUDE_EFI_H_
> +#define __I386_INCLUDE_EFI_H_
> +
> +#define      EFIABI_ATTR /* __attribute__((ms_abi)) */ /* clang fails with 
> this */
> +
> +/* Note: we don't actually support this on i386 yet */
> +
> +#endif /* __I386_INCLUDE_EFI_H_ */
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