115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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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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// 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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#include "esp_efuse.h"
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#include "esp_log.h"
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#include <string.h>
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#include "bootloader_random.h"
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#define EFUSE_CONF_WRITE 0x5A5A /* efuse_pgm_op_ena, force no rd/wr disable */
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#define EFUSE_CONF_READ 0x5AA5 /* efuse_read_op_ena, release force */
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#define EFUSE_CMD_PGM 0x02
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#define EFUSE_CMD_READ 0x01
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static const char *TAG = "efuse";
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void esp_efuse_burn_new_values(void)
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{
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REG_WRITE(EFUSE_CONF_REG, EFUSE_CONF_WRITE);
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REG_WRITE(EFUSE_CMD_REG, EFUSE_CMD_PGM);
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while (REG_READ(EFUSE_CMD_REG) != 0) {
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}
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REG_WRITE(EFUSE_CONF_REG, EFUSE_CONF_READ);
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REG_WRITE(EFUSE_CMD_REG, EFUSE_CMD_READ);
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while (REG_READ(EFUSE_CMD_REG) != 0) {
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}
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esp_efuse_reset();
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}
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void esp_efuse_reset(void)
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{
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REG_WRITE(EFUSE_CONF_REG, EFUSE_CONF_READ);
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const uint32_t block_start[4] = { EFUSE_BLK0_WDATA0_REG, EFUSE_BLK1_WDATA0_REG,
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EFUSE_BLK2_WDATA0_REG, EFUSE_BLK3_WDATA0_REG };
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const uint32_t block_end[4] = { EFUSE_BLK0_WDATA6_REG, EFUSE_BLK1_WDATA7_REG,
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EFUSE_BLK2_WDATA7_REG, EFUSE_BLK3_WDATA7_REG };
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for (int i = 0; i < 4; i++) {
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for (uint32_t r = block_start[i]; r <= block_end[i]; r+= 4) {
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REG_WRITE(r, 0);
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}
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}
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}
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void esp_efuse_disable_basic_rom_console(void)
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{
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if ((REG_READ(EFUSE_BLK0_RDATA6_REG) & EFUSE_RD_CONSOLE_DEBUG_DISABLE) == 0) {
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ESP_EARLY_LOGI(TAG, "Disable BASIC ROM Console fallback via efuse...");
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esp_efuse_reset();
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REG_WRITE(EFUSE_BLK0_WDATA6_REG, EFUSE_RD_CONSOLE_DEBUG_DISABLE);
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esp_efuse_burn_new_values();
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}
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}
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esp_err_t esp_efuse_apply_34_encoding(const uint8_t *in_bytes, uint32_t *out_words, size_t in_bytes_len)
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{
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if (in_bytes == NULL || out_words == NULL || in_bytes_len % 6 != 0) {
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return ESP_ERR_INVALID_ARG;
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}
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while (in_bytes_len > 0) {
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uint8_t out[8];
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uint8_t xor = 0;
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uint8_t mul = 0;
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for (int i = 0; i < 6; i++) {
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xor ^= in_bytes[i];
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mul += (i + 1) * __builtin_popcount(in_bytes[i]);
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}
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memcpy(out, in_bytes, 6); // Data bytes
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out[6] = xor;
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out[7] = mul;
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memcpy(out_words, out, 8);
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in_bytes_len -= 6;
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in_bytes += 6;
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out_words += 2;
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}
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return ESP_OK;
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}
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void esp_efuse_write_random_key(uint32_t blk_wdata0_reg)
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{
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uint32_t buf[8];
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uint8_t raw[24];
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uint32_t coding_scheme = REG_READ(EFUSE_BLK0_RDATA6_REG) & EFUSE_CODING_SCHEME_M;
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if (coding_scheme == EFUSE_CODING_SCHEME_VAL_NONE) {
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bootloader_fill_random(buf, sizeof(buf));
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} else { // 3/4 Coding Scheme
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bootloader_fill_random(raw, sizeof(raw));
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esp_err_t r = esp_efuse_apply_34_encoding(raw, buf, sizeof(raw));
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assert(r == ESP_OK);
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}
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ESP_LOGV(TAG, "Writing random values to address 0x%08x", blk_wdata0_reg);
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for (int i = 0; i < 8; i++) {
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ESP_LOGV(TAG, "EFUSE_BLKx_WDATA%d_REG = 0x%08x", i, buf[i]);
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REG_WRITE(blk_wdata0_reg + 4*i, buf[i]);
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}
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bzero(buf, sizeof(buf));
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bzero(raw, sizeof(raw));
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}
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