esp-idf/components/esp_mm/include/esp_cache.h

59 lines
2.0 KiB
C

/*
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <stdlib.h>
#include <stdint.h>
#include "esp_err.h"
#include "esp_bit_defs.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Cache msync flags
*/
/**
* @brief Do an invalidation with the values that just written
*/
#define ESP_CACHE_MSYNC_FLAG_INVALIDATE BIT(0)
/**
* @brief Allow writeback a block that are not aligned to the data cache line size
*/
#define ESP_CACHE_MSYNC_FLAG_UNALIGNED BIT(1)
/**
* @brief Memory sync between Cache and external memory
*
* - For cache writeback supported chips (you can refer to SOC_CACHE_WRITEBACK_SUPPORTED in soc_caps.h)
* - this API will do a writeback to synchronise between cache and the PSRAM
* - with ESP_CACHE_MSYNC_FLAG_INVALIDATE, this API will also invalidate the values that just written
* - note: although ESP32 is with PSRAM, but cache writeback isn't supported, so this API will do nothing on ESP32
* - For other chips, this API will do nothing. The out-of-sync should be already dealt by the SDK
*
* This API is cache-safe and thread-safe
*
* @note You should not call this during any Flash operations (e.g. esp_flash APIs, nvs and some other APIs that are based on esp_flash APIs)
* @note If XIP_From_PSRAM is enabled (by enabling both CONFIG_SPIRAM_FETCH_INSTRUCTIONS and CONFIG_SPIRAM_RODATA), you can call this API during Flash operations
*
* @param[in] addr Starting address to do the msync
* @param[in] size Size to do the msync
* @param[in] flags Flags, see `ESP_CACHE_MSYNC_FLAG_x`
*
* @return
* - ESP_OK:
* - Successful msync
* - If this chip doesn't support cache writeback, if the input addr is a cache supported one, this API will return ESP_OK
* - ESP_ERR_INVALID_ARG: Invalid argument, not cache supported addr, see printed logs
*/
esp_err_t esp_cache_msync(void *addr, size_t size, int flags);
#ifdef __cplusplus
}
#endif