mirror of https://gitee.com/openkylin/linux.git
36 lines
925 B
C
36 lines
925 B
C
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/*
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* Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/efi.h>
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#include <asm/efi.h>
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#include "efistub.h"
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struct efi_rng_protocol {
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efi_status_t (*get_info)(struct efi_rng_protocol *,
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unsigned long *, efi_guid_t *);
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efi_status_t (*get_rng)(struct efi_rng_protocol *,
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efi_guid_t *, unsigned long, u8 *out);
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};
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efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
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unsigned long size, u8 *out)
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{
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efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
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efi_status_t status;
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struct efi_rng_protocol *rng;
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status = efi_call_early(locate_protocol, &rng_proto, NULL,
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(void **)&rng);
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if (status != EFI_SUCCESS)
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return status;
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return rng->get_rng(rng, NULL, size, out);
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}
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