Outline ![]()
Files ![]()
loading...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
/*
* 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"
#include "hal/mmu_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* MMU Memory Mapping Driver APIs for MMU supported memory
*
*
* Driver Backgrounds:
*
* --------------------------------------------------------------------------------------------------------
* Memory Pool |
* --------------------------------------------------------------------------------------------------------
* | Memory Region 0 | Memory Region 1 | ... |
* --------------------------------------------------------------------------------------------------------
* | Block 0 | Slot 0 | Block 1 | Block 2 | ... | Slot 1 (final slot) | ... |
* --------------------------------------------------------------------------------------------------------
*
* - A memory pool stands for the whole virtual address range that can be mapped to physical memory
* - A memory region is a range of virtual address with same attributes
* - A block is a piece of vaddr range that is dynamically mapped.
* - A Slot is the vaddr range between 2 blocks.
*/
/**
* MMAP flags
*/
/**
* @brief Share this mapping
*
* - If this flag is set, a paddr block can be mapped to multiple vaddr blocks.
* 1. This happens when:
* - the to-be-mapped paddr block is overlapped with an already mapped paddr block.
* - the to-be-mapped paddr block encloses an already mapped paddr block.
* 2. If the to-be-mapped paddr block is enclosed by an already mapped paddr block, no new mapping will happen, return ESP_ERR_INVALID_STATE. The out pointer will be the already mapped paddr corresponding vaddr.
* 3. If the to-be-mapped paddr block is identical with an already mapped paddr block, no new mapping will happen, return ESP_ERR_INVALID_STATE. The out pointer will be the corresponding vaddr.
*
* - If this flag isn't set, overlapped, enclosed or same to-be-mapped paddr block will lead to ESP_ERR_INVALID_ARG.
*/
#define ESP_MMU_MMAP_FLAG_PADDR_SHARED BIT(0)
/**
* @brief Physical memory type
*/
typedef uint32_t esp_paddr_t;
/**
* @brief Map a physical memory block to external virtual address block, with given capabilities.
*
* @note This API does not guarantee thread safety
*
* @param[in] paddr_start Start address of the physical memory block
* @param[in] size Size to be mapped. Size will be rounded up by to the nearest multiple of MMU page size
* @param[in] target Physical memory target you're going to map to, see `mmu_target_t`
* @param[in] caps Memory capabilities, see `mmu_mem_caps_t`
* @param[in] flags Mmap flags
* @param[out] out_ptr Start address of the mapped virtual memory
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG: Invalid argument, see printed logs
* - ESP_ERR_NOT_SUPPORTED: Only on ESP32, PSRAM is not a supported physical memory target
* - ESP_ERR_NOT_FOUND: No enough size free block to use
* - ESP_ERR_NO_MEM: Out of memory, this API will allocate some heap memory for internal usage
* - ESP_ERR_INVALID_STATE: Paddr is mapped already, this API will return corresponding `vaddr_start + new_block_offset` as per the previously mapped block.
* Only to-be-mapped paddr block is totally enclosed by a previously mapped block will lead to this error. (Identical scenario will behave similarly)
* new_block_start new_block_end
* |-------- New Block --------|
* |--------------- Block ---------------|
* block_start block_end
*
*/
esp_err_t esp_mmu_map(esp_paddr_t paddr_start, size_t size, mmu_target_t target, mmu_mem_caps_t caps, int flags, void **out_ptr);
/**
* @brief Unmap a previously mapped virtual memory block
*
* @note This API does not guarantee thread safety
*
* @param[in] ptr Start address of the virtual memory
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG: Null pointer
* - ESP_ERR_NOT_FOUND: Vaddr is not in external memory, or it's not mapped yet
*/
esp_err_t esp_mmu_unmap(void *ptr);
/**
* @brief Get largest consecutive free external virtual memory block size, with given capabilities and given physical target
*
* @param[in] caps Bitwise OR of MMU_MEM_CAP_* flags indicating the memory block
* @param[in] target Physical memory target you're going to map to, see `mmu_target_t`.
* @param[out] out_len Largest free block length, in bytes.
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG: Invalid arguments, could be null pointer
*/
esp_err_t esp_mmu_map_get_max_consecutive_free_block_size(mmu_mem_caps_t caps, mmu_target_t target, size_t *out_len);
/**
* Dump all the previously mapped blocks
*
* @note This API shall not be called from an ISR.
* @note This API does not guarantee thread safety
*
* @param stream stream to print information to; use stdout or stderr to print
* to the console; use fmemopen/open_memstream to print to a
* string buffer.
* @return
* - ESP_OK
*/
esp_err_t esp_mmu_map_dump_mapped_blocks(FILE* stream);
/**
* @brief Convert virtual address to physical address
*
* @param[in] vaddr Virtual address
* @param[out] out_paddr Physical address
* @param[out] out_target Physical memory target, see `mmu_target_t`
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG: Null pointer, or vaddr is not within external memory
* - ESP_ERR_NOT_FOUND: Vaddr is not mapped yet
*/
esp_err_t esp_mmu_vaddr_to_paddr(void *vaddr, esp_paddr_t *out_paddr, mmu_target_t *out_target);
/**
* @brief Convert physical address to virtual address
*
* @param[in] paddr Physical address
* @param[in] target Physical memory target, see `mmu_target_t`
* @param[in] type Virtual address type, could be either instruction or data
* @param[out] out_vaddr Virtual address
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG: Null pointer
* - ESP_ERR_NOT_FOUND: Paddr is not mapped yet
*/
esp_err_t esp_mmu_paddr_to_vaddr(esp_paddr_t paddr, mmu_target_t target, mmu_vaddr_t type, void **out_vaddr);
/**
* @brief If the physical address is mapped, this API will provide the capabilities of the virtual address where the physical address is mapped to.
*
* @note: Only return value is ESP_OK(which means physically address is successfully mapped), then caps you get make sense.
* @note This API only check one page (see CONFIG_MMU_PAGE_SIZE), starting from the `paddr`
*
* @param[in] paddr Physical address
* @param[out] out_caps Bitwise OR of MMU_MEM_CAP_* flags indicating the capabilities of a virtual address where the physical address is mapped to.
* @return
* - ESP_OK: Physical address successfully mapped.
* - ESP_ERR_INVALID_ARG: Null pointer
* - ESP_ERR_NOT_FOUND: Physical address is not mapped successfully.
*/
esp_err_t esp_mmu_paddr_find_caps(const esp_paddr_t paddr, mmu_mem_caps_t *out_caps);
#ifdef __cplusplus
}
#endif
Details ![]()
Show: from Types: Columns: ![]( "Show Project Names")
![]( "Show Locations")
![]( "Show Referring Symbols")
![]( "Show Scope")
This file uses the notable symbols shown below. Click anywhere in the file to view more details.