mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
e4fbf47674
This exposes the firmware's implementation of EFI_RNG_PROTOCOL via a new function efi_get_random_bytes(). Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
35 lines
925 B
C
35 lines
925 B
C
/*
|
|
* Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/efi.h>
|
|
#include <asm/efi.h>
|
|
|
|
#include "efistub.h"
|
|
|
|
struct efi_rng_protocol {
|
|
efi_status_t (*get_info)(struct efi_rng_protocol *,
|
|
unsigned long *, efi_guid_t *);
|
|
efi_status_t (*get_rng)(struct efi_rng_protocol *,
|
|
efi_guid_t *, unsigned long, u8 *out);
|
|
};
|
|
|
|
efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
|
|
unsigned long size, u8 *out)
|
|
{
|
|
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
|
|
efi_status_t status;
|
|
struct efi_rng_protocol *rng;
|
|
|
|
status = efi_call_early(locate_protocol, &rng_proto, NULL,
|
|
(void **)&rng);
|
|
if (status != EFI_SUCCESS)
|
|
return status;
|
|
|
|
return rng->get_rng(rng, NULL, size, out);
|
|
}
|