152 lines
5.5 KiB
C
152 lines
5.5 KiB
C
// Copyright 2018 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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//
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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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#pragma once
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#include <stddef.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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//Opaque pointers as handles for ram/range data
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typedef struct esp_himem_ramdata_t *esp_himem_handle_t;
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typedef struct esp_himem_rangedata_t *esp_himem_rangehandle_t;
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//ESP32 MMU block size
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#define ESP_HIMEM_BLKSZ (0x8000)
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#define ESP_HIMEM_MAPFLAG_RO 1 /*!< Indicates that a mapping will only be read from. Note that this is unused for now. */
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/**
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* @brief Allocate a block in high memory
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*
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* @param size Size of the to-be-allocated block, in bytes. Note that this needs to be
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* a multiple of the external RAM mmu block size (32K).
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* @param[out] handle_out Handle to be returned
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* @returns - ESP_OK if succesful
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* - ESP_ERR_NO_MEM if out of memory
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* - ESP_ERR_INVALID_SIZE if size is not a multiple of 32K
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*/
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esp_err_t esp_himem_alloc(size_t size, esp_himem_handle_t *handle_out);
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/**
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* @brief Allocate a memory region to map blocks into
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*
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* This allocates a contiguous CPU memory region that can be used to map blocks
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* of physical memory into.
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*
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* @param size Size of the range to be allocated. Note this needs to be a multiple of
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* the external RAM mmu block size (32K).
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* @param[out] handle_out Handle to be returned
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* @returns - ESP_OK if succesful
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* - ESP_ERR_NO_MEM if out of memory or address space
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* - ESP_ERR_INVALID_SIZE if size is not a multiple of 32K
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*/
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esp_err_t esp_himem_alloc_map_range(size_t size, esp_himem_rangehandle_t *handle_out);
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/**
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* @brief Map a block of high memory into the CPUs address space
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*
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* This effectively makes the block available for read/write operations.
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*
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* @note The region to be mapped needs to have offsets and sizes that are aligned to the
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* SPI RAM MMU block size (32K)
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*
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* @param handle Handle to the block of memory, as given by esp_himem_alloc
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* @param range Range handle to map the memory in
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* @param ram_offset Offset into the block of physical memory of the block to map
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* @param range_offset Offset into the address range where the block will be mapped
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* @param len Length of region to map
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* @param flags One of ESP_HIMEM_MAPFLAG_*
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* @param[out] out_ptr Pointer to variable to store resulting memory pointer in
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* @returns - ESP_OK if the memory could be mapped
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* - ESP_ERR_INVALID_ARG if offset, range or len aren't MMU-block-aligned (32K)
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* - ESP_ERR_INVALID_SIZE if the offsets/lengths don't fit in the allocated memory or range
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* - ESP_ERR_INVALID_STATE if a block in the selected ram offset/length is already mapped, or
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* if a block in the selected range offset/length already has a mapping.
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*/
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esp_err_t esp_himem_map(esp_himem_handle_t handle, esp_himem_rangehandle_t range, size_t ram_offset, size_t range_offset, size_t len, int flags, void **out_ptr);
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/**
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* @brief Free a block of physical memory
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*
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* This clears out the associated handle making the memory available for re-allocation again.
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* This will only succeed if none of the memory blocks currently have a mapping.
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*
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* @param handle Handle to the block of memory, as given by esp_himem_alloc
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* @returns - ESP_OK if the memory is succesfully freed
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* - ESP_ERR_INVALID_ARG if the handle still is (partially) mapped
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*/
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esp_err_t esp_himem_free(esp_himem_handle_t handle);
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/**
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* @brief Free a mapping range
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*
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* This clears out the associated handle making the range available for re-allocation again.
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* This will only succeed if none of the range blocks currently are used for a mapping.
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*
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* @param handle Handle to the range block, as given by esp_himem_alloc_map_range
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* @returns - ESP_OK if the memory is succesfully freed
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* - ESP_ERR_INVALID_ARG if the handle still is (partially) mapped to
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*/
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esp_err_t esp_himem_free_map_range(esp_himem_rangehandle_t handle);
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/**
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* @brief Unmap a region
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*
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* @param range Range handle
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* @param ptr Pointer returned by esp_himem_map
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* @param len Length of the block to be unmapped. Must be aligned to the SPI RAM MMU blocksize (32K)
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* @returns - ESP_OK if the memory is succesfully unmapped,
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* - ESP_ERR_INVALID_ARG if ptr or len are invalid.
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*/
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esp_err_t esp_himem_unmap(esp_himem_rangehandle_t range, void *ptr, size_t len);
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/**
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* @brief Get total amount of memory under control of himem API
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*
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* @returns Amount of memory, in bytes
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*/
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size_t esp_himem_get_phys_size();
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/**
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* @brief Get free amount of memory under control of himem API
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*
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* @returns Amount of free memory, in bytes
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*/
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size_t esp_himem_get_free_size();
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/**
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* @brief Get amount of SPI memory address space needed for bankswitching
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*
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* @note This is also weakly defined in esp32/spiram.c and returns 0 there, so
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* if no other function in this file is used, no memory is reserved.
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*
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* @returns Amount of reserved area, in bytes
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*/
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size_t esp_himem_reserved_area_size();
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#ifdef __cplusplus
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}
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#endif
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