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63 lines
1.9 KiB
63 lines
1.9 KiB
11 months ago
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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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 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "../flash_otp.h"
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#define OTP_BLOCK_SIZE 32
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#define FLASH_SECTOR_OTP (FLASH_SECTOR_COUNT)
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static uint8_t OTP_BUFFER[OTP_BLOCK_SIZE * 64];
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void flash_otp_init(void) {
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// fill OTP buffer with ones
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memset(OTP_BUFFER, 0xFF, sizeof(OTP_BUFFER));
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}
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secbool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data,
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uint8_t datalen) {
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if (offset + datalen > OTP_BLOCK_SIZE) {
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return secfalse;
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}
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uint32_t offset_in_sector = block * OTP_BLOCK_SIZE + offset;
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memcpy(data, OTP_BUFFER + offset_in_sector, datalen);
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return sectrue;
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}
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secbool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data,
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uint8_t datalen) {
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if (offset + datalen > OTP_BLOCK_SIZE) {
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return secfalse;
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}
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uint32_t offset_in_sector = block * OTP_BLOCK_SIZE + offset;
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uint8_t *flash = OTP_BUFFER + offset_in_sector;
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for (int i = 0; i < datalen; i++) {
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if ((flash[i] & data[i]) != data[i]) {
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return secfalse; // we cannot change zeroes to ones
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}
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flash[i] = data[i];
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}
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return sectrue;
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}
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secbool flash_otp_lock(uint8_t block) { return secfalse; }
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secbool flash_otp_is_locked(uint8_t block) { return secfalse; }
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