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fix(spi_flash): integrate branch prediction control during cache operations

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wuzhenghui
2026-08-31 10:51:05 +08:00
committed by Armando (Dou Yiwen)
parent 8201d8c607
commit a76e14afe7
5 changed files with 70 additions and 26 deletions
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components/spi_flash/include/esp_private/cache_utils.h
+10 -3
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2015-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -97,7 +97,11 @@ bool spi_flash_cache_enabled(void);
void spi_flash_enable_cache(uint32_t cpuid);
/**
* @brief Suspend the Cache access to external memory, will disable branch predictor if supported.
* @brief Suspend the Cache access to external memory.
*
* @note Callers must disable branch prediction around this window when
* SOC_BRANCH_PREDICTOR_SUPPORTED, otherwise speculative fetches can
* raise cache access-fail errors while the cache is suspended.
*
* @param cpuid the core number to enable the cache for, meaning less on shared cache.
* @param saved_state Cache status hold by hal (Used only on ROM impl. in idf, this param unused)
@@ -105,7 +109,10 @@ void spi_flash_enable_cache(uint32_t cpuid);
void spi_flash_disable_cache(uint32_t cpuid, uint32_t *saved_state);
/**
* @brief Resume the Cache access to external memory, will enable branch predictor if supported.
* @brief Resume the Cache access to external memory.
*
* @note Callers that disabled branch prediction for the suspend window must
* re-enable it after this call when SOC_BRANCH_PREDICTOR_SUPPORTED.
*
* @param cpuid the core number to enable the cache for, meaning less on shared cache.
* @param saved_state Cache status hold by hal (Used only on ROM impl. in idf, this param unused)