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refactor(rng): move rng read data function to rng_ll.h and update docs of RNG source

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gaoxu
2026-05-13 15:09:55 +08:00
parent 3d7a643ff7
commit 07aaba7c7b
18 changed files with 338 additions and 22 deletions
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12
components/bootloader_support/src/bootloader_random.c
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2010-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2010-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -7,7 +7,7 @@
#include "esp_log.h"
#include "bootloader_random.h"
#include "esp_cpu.h"
#include "soc/wdev_reg.h"
#include "hal/rng_ll.h"
#include "hal/rtc_timer_hal.h"
@@ -46,10 +46,10 @@
for (size_t i = 0; i < length; i++) {
#if !SOC_RTC_TIMER_V1
random = REG_READ(WDEV_RND_REG);
random = rng_ll_read_data();
start = esp_cpu_get_cycle_count();
do {
random ^= REG_READ(WDEV_RND_REG);
random ^= rng_ll_read_data();
now = esp_cpu_get_cycle_count();
} while (now - start < RNG_CPU_WAIT_CYCLE_NUM);
@@ -68,10 +68,10 @@
as-is, we repeatedly read the RNG register and XOR all
values.
*/
random = REG_READ(WDEV_RND_REG);
random = rng_ll_read_data();
start = esp_cpu_get_cycle_count();
do {
random ^= REG_READ(WDEV_RND_REG);
random ^= rng_ll_read_data();
now = esp_cpu_get_cycle_count();
} while (now - start < RNG_CPU_WAIT_CYCLE_NUM);
}