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62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fake_otp.h"
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#include "drivers/otp.h"
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#include "system/passert.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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char s_otp_buffer[512];
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uint8_t s_otp_locks[16];
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void fake_otp_reset(void) {
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memset(s_otp_buffer, 0xff, sizeof(s_otp_buffer));
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memset(s_otp_locks, 0xff, sizeof(s_otp_locks));
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}
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char * otp_get_slot(const uint8_t index) {
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PBL_ASSERTN(index < NUM_OTP_SLOTS);
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return (char * const) (s_otp_buffer + (32 * index));
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}
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uint8_t * otp_get_lock(const uint8_t index) {
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PBL_ASSERTN(index < NUM_OTP_SLOTS);
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return (uint8_t * const) (s_otp_locks + index);
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}
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bool otp_is_locked(const uint8_t index) {
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return (*otp_get_lock(index) == 0);
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}
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OtpWriteResult otp_write_slot(const uint8_t index, const char *value) {
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if (otp_is_locked(index)) {
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return OtpWriteFailAlreadyWritten;
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}
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// Write the value
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char *slot = otp_get_slot(index);
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strcpy(slot, value);
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// Lock the OTP sector
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uint8_t *lock = otp_get_lock(index);
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*lock = 0;
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return OtpWriteSuccess;
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}
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