94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <asm/cpu.h>
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#include <asm/pgtable.h>
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#include <rtl.h>
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#include <asm/seed.h>
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#include "seed_abl.h"
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#define ABL_SEED_LEN 32U
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struct abl_seed_info {
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uint8_t svn;
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uint8_t reserved[3];
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uint8_t seed[ABL_SEED_LEN];
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};
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#define ABL_SEED_LIST_MAX 4U
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struct abl_svn_seed {
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uint32_t size_of_this_struct;
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uint32_t version;
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uint32_t num_seeds;
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struct abl_seed_info seed_list[ABL_SEED_LIST_MAX];
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};
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/*
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* parse_seed_abl
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*
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* description:
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* This function parse seed_list which provided by ABL.
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*
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* input:
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* cmdline pointer to cmdline string
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*
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* output:
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* phy_seed pointer to physical seed structure
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*
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* return value:
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* true if parse successfully, otherwise false.
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*/
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bool parse_seed_abl(uint64_t addr, struct physical_seed *phy_seed)
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{
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uint32_t i;
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uint32_t legacy_seed_index = 0U;
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struct seed_info *seed_list;
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struct abl_svn_seed *abl_seed = (struct abl_svn_seed *)hpa2hva(addr);
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bool status = false;
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if ((phy_seed != NULL) && (abl_seed != NULL) &&
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(abl_seed->num_seeds >= 2U) && (abl_seed->num_seeds <= ABL_SEED_LIST_MAX)) {
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seed_list = phy_seed->seed_list;
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/*
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* The seed_list from ABL contains several seeds which based on SVN
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* and one legacy seed which is not based on SVN. The legacy seed's
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* svn value is minimum in the seed list. And CSE ensures at least two
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* seeds will be generated which will contain the legacy seed.
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* Here find the legacy seed index first.
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*/
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for (i = 1U; i < abl_seed->num_seeds; i++) {
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if (abl_seed->seed_list[i].svn < abl_seed->seed_list[legacy_seed_index].svn) {
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legacy_seed_index = i;
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}
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}
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/*
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* Copy out abl_seed for trusty and clear the original seed in memory.
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* The SOS requires the legacy seed to derive RPMB key. So skip the
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* legacy seed when clear original seed.
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*/
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(void)memset((void *)&phy_seed->seed_list[0U], 0U, sizeof(phy_seed->seed_list));
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for (i = 0U; i < abl_seed->num_seeds; i++) {
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seed_list[i].cse_svn = abl_seed->seed_list[i].svn;
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(void)memcpy_s((void *)&seed_list[i].seed[0U], sizeof(seed_list[i].seed),
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(void *)&abl_seed->seed_list[i].seed[0U], sizeof(abl_seed->seed_list[i].seed));
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if (i == legacy_seed_index) {
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continue;
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}
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(void)memset((void *)&abl_seed->seed_list[i].seed[0U], 0U,
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sizeof(abl_seed->seed_list[i].seed));
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}
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phy_seed->num_seeds = abl_seed->num_seeds;
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status = true;
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}
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return status;
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}
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