mirror of
https://github.com/espressif/esp-idf.git
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2d44dc1eed
This commit gives basic mmu driver framework. Now it is able to maintain mmu virtual address usage on esp32, esp32s2 and esp32s3. Usage to external virtual address should rely on mmu functions to know which address range is available, instead of hardcoded. This commit also improves psram memory that is added to the heap allocator. Now it's added to the heap, according to the memory alignment. Closes https://github.com/espressif/esp-idf/issues/8295
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdlib.h>
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#include <stdint.h>
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#include "esp_err.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* This file will be moved out of `esp_psram` component. And will be
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* future MMU driver, to maintain all the external memory contexts including:
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* - Flash
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* - PSRAM
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* - DDR
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*
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* Now only support ESP32, ESP32S2, ESP32S3 virtual address maintenance, and is internal
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*/
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#define MMU_MEM_CAP_EXEC (1<<0)
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#define MMU_MEM_CAP_READ (1<<1)
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#define MMU_MEM_CAP_WRITE (1<<2)
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#define MMU_MEM_CAP_32BIT (1<<3)
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#define MMU_MEM_CAP_8BIT (1<<4)
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/**
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* @brief Initialise the MMU driver
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*
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* This is called once in the IDF startup code. Don't call it in applications
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*/
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void esp_mmu_init(void);
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/**
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* @brief Get largest consecutive free external virtual memory block, with given capabilities
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*
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* @param[in] caps Bitwise OR of MMU_MEM_CAP_* flags indicating the memory block
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* @param[out] out_len Largest free block length, in bytes.
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*
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* @return
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* - ESP_OK: On success
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* - ESP_ERR_INVALID_ARG: Invalid arguments, could be null pointer
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*/
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esp_err_t esp_mmu_get_largest_free_block(int caps, size_t *out_len);
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/**
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* @brief Find a consecutive external virtual memory range, with given capabilities and size
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*
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* @param[in] size Size, in bytes, the amount of memory to find
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* @param[in] caps Bitwise OR of MMU_MEM_CAP_* flags indicating the memory block
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* @param[out] out_ptr Pointer to the memory range found
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*
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* @return
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* - ESP_OK: On success
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* - ESP_ERR_INVALID_ARG: Invalid arguments, could be wrong caps makeup, or null pointer
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* - ESP_ERR_NOT_FOUND: Didn't find enough memory with give caps
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*/
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esp_err_t esp_mmu_find_vaddr_range(size_t size, uint32_t caps, const void **out_ptr);
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/**
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* @brief Dump internal memory region usage
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*
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* @return
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* - ESP_OK: On success
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*/
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esp_err_t esp_mmu_dump_region_usage(void);
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#ifdef __cplusplus
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}
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#endif
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