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519 lines
20 KiB
C
519 lines
20 KiB
C
// Copyright 2020 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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/* INTERNAL API
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* generic interface to MMU memory protection features
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include "esp_attr.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//convenient constants for better code readabilty
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#define RD_ENA true
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#define RD_DIS false
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#define WR_ENA true
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#define WR_DIS false
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#define EX_ENA true
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#define EX_DIS false
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#define RD_LOW_ENA true
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#define RD_LOW_DIS false
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#define WR_LOW_ENA true
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#define WR_LOW_DIS false
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#define EX_LOW_ENA true
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#define EX_LOW_DIS false
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#define RD_HIGH_ENA true
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#define RD_HIGH_DIS false
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#define WR_HIGH_ENA true
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#define WR_HIGH_DIS false
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#define EX_HIGH_ENA true
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#define EX_HIGH_DIS false
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#define PANIC_HNDL_ON true
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#define PANIC_HNDL_OFF false
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#define MEMPROT_LOCK true
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#define MEMPROT_UNLOCK false
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#define DEF_SPLIT_LINE NULL
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//memory range types
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typedef enum {
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MEMPROT_NONE = 0x00000000,
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MEMPROT_IRAM0_SRAM = 0x00000001, //0x40020000-0x4006FFFF, RWX
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MEMPROT_DRAM0_SRAM = 0x00000002, //0x3FFB0000-0x3FFFFFFF, RW
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MEMPROT_IRAM0_RTCFAST = 0x00000004, //0x40070000-0x40071FFF, RWX
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MEMPROT_DRAM0_RTCFAST = 0x00000008, //0x3FF9E000-0x3FF9FFFF, RW
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MEMPROT_PERI1_RTCSLOW = 0x00000010, //0x3F421000-0x3F423000, RW
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MEMPROT_PERI2_RTCSLOW_0 = 0x00000020, //0x50001000-0x50003000, RWX
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MEMPROT_PERI2_RTCSLOW_1 = 0x00000040, //0x60002000-0x60004000, RWX
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MEMPROT_ALL = 0xFFFFFFFF
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} mem_type_prot_t;
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/**
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* @brief Returns splitting address for required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Splitting address for the memory region required.
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* The address is given by region-specific global symbol exported from linker script,
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* it is not read out from related configuration register.
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*/
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uint32_t *IRAM_ATTR esp_memprot_get_split_addr(mem_type_prot_t mem_type);
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/**
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* @brief Initializes illegal memory access control (MMU) for required memory section.
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*
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* All memory access interrupts share ETS_MEMACCESS_ERR_INUM input channel, it is caller's
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* responsibility to properly detect actual intr. source as well as possible prioritization in case
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* of multiple source reported during one intr.handling routine run
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*/
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void esp_memprot_intr_init(mem_type_prot_t mem_type);
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/**
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* @brief Enable/disable the memory protection interrupt
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param enable enable/disable
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*/
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void esp_memprot_intr_ena(mem_type_prot_t mem_type, bool enable);
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/**
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* @brief Sets a request for clearing interrupt-on flag for specified memory region (register write)
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*
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* @note When called without actual interrupt-on flag set, subsequent occurrence of related interrupt is ignored.
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* Should be used only after the real interrupt appears, typically as the last step in interrupt handler's routine.
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*/
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void esp_memprot_clear_intr(mem_type_prot_t mem_type);
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/**
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* @brief Detects which memory protection interrupt is active
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*
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* @note Check order
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* MEMPROT_IRAM0_SRAM
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* MEMPROT_IRAM0_RTCFAST
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* MEMPROT_DRAM0_SRAM
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* MEMPROT_DRAM0_RTCFAST
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*
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* @return Memory protection area type (see mem_type_prot_t enum)
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*/
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mem_type_prot_t IRAM_ATTR esp_memprot_get_active_intr_memtype(void);
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/**
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* @brief Gets interrupt status register contents for specified memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Contents of status register
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*/
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uint32_t esp_memprot_get_fault_reg(mem_type_prot_t mem_type);
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/**
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* @brief Get details of given interrupt status
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param faulting_address Faulting address causing the interrupt [out]
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* @param op_type Operation being processed at the faulting address [out]
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* IRAM0: 0 - read, 1 - write
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* DRAM0: 0 - read, 1 - write
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* @param op_subtype Additional info for op_type [out]
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* IRAM0: 0 - instruction segment access, 1 - data segment access
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* DRAM0: 0 - non-atomic operation, 1 - atomic operation
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*/
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void IRAM_ATTR esp_memprot_get_fault_status(mem_type_prot_t mem_type, uint32_t **faulting_address, uint32_t *op_type, uint32_t *op_subtype);
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/**
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* @brief Gets string representation of required memory region identifier
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return mem_type as string
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*/
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const char *IRAM_ATTR esp_memprot_type_to_str(mem_type_prot_t mem_type);
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/**
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* @brief Detects whether any of the interrupt locks is active (requires digital system reset to unlock)
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*
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* @return true/false
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*/
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bool esp_memprot_is_locked_any(void);
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/**
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* @brief Sets lock for specified memory region.
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*
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* Locks can be unlocked only by digital system reset
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*/
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void esp_memprot_set_lock(mem_type_prot_t mem_type);
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/**
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* @brief Gets lock status for required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return true/false (locked/unlocked)
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*/
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bool esp_memprot_get_lock(mem_type_prot_t mem_type);
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/**
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* @brief Gets permission control configuration register contents for required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Permission control register contents
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*/
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uint32_t esp_memprot_get_conf_reg(mem_type_prot_t mem_type);
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/**
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* @brief Gets interrupt permission settings for unified management block
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*
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* Gets interrupt permission settings register contents for required memory region, returns settings for unified management blocks
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Permission settings register contents
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*/
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uint32_t esp_memprot_get_perm_uni_reg(mem_type_prot_t mem_type);
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/**
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* @brief Gets interrupt permission settings for split management block
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*
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* Gets interrupt permission settings register contents for required memory region, returns settings for split management blocks
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Permission settings register contents
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*/
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uint32_t esp_memprot_get_perm_split_reg(mem_type_prot_t mem_type);
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/**
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* @brief Detects whether any of the memory protection interrupts is enabled
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*
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* @return true/false
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*/
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bool esp_memprot_is_intr_ena_any(void);
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/**
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* @brief Gets interrupt-enabled flag for given memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Interrupt-enabled value
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*/
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uint32_t esp_memprot_get_intr_ena_bit(mem_type_prot_t mem_type);
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/**
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* @brief Gets interrupt-active flag for given memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Interrupt-active value
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*/
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uint32_t esp_memprot_get_intr_on_bit(mem_type_prot_t mem_type);
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/**
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* @brief Gets interrupt-clear request flag for given memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*
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* @return Interrupt-clear request value
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*/
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uint32_t esp_memprot_get_intr_clr_bit(mem_type_prot_t mem_type);
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/**
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* @brief Gets read permission value for specified block and memory region
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*
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* Returns read permission bit value for required unified-management block (0-3) in given memory region.
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* Applicable to all memory types.
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param block Memory block identifier (0-3)
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*
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* @return Read permission value for required block
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*/
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uint32_t esp_memprot_get_uni_block_read_bit(mem_type_prot_t mem_type, uint32_t block);
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/**
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* @brief Gets write permission value for specified block and memory region
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*
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* Returns write permission bit value for required unified-management block (0-3) in given memory region.
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* Applicable to all memory types.
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param block Memory block identifier (0-3)
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*
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* @return Write permission value for required block
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*/
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uint32_t esp_memprot_get_uni_block_write_bit(mem_type_prot_t mem_type, uint32_t block);
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/**
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* @brief Gets execute permission value for specified block and memory region
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*
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* Returns execute permission bit value for required unified-management block (0-3) in given memory region.
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* Applicable only to IRAM memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param block Memory block identifier (0-3)
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*
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* @return Execute permission value for required block
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*/
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uint32_t esp_memprot_get_uni_block_exec_bit(mem_type_prot_t mem_type, uint32_t block);
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/**
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* @brief Sets permissions for specified block in DRAM region
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*
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* Sets Read and Write permission for specified unified-management block (0-3) in given memory region.
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* Applicable only to DRAM memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param block Memory block identifier (0-3)
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* @param write_perm Write permission flag
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* @param read_perm Read permission flag
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*/
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void esp_memprot_set_uni_block_perm_dram(mem_type_prot_t mem_type, uint32_t block, bool write_perm, bool read_perm);
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/**
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* @brief Sets permissions for high and low memory segment in DRAM region
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*
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* Sets Read and Write permission for both low and high memory segments given by splitting address.
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* The splitting address must be equal to or higher then beginning of block 5
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* Applicable only to DRAM memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param split_addr Address to split the memory region to lower and higher segment
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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*/
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void esp_memprot_set_prot_dram(mem_type_prot_t mem_type, uint32_t *split_addr, bool lw, bool lr, bool hw, bool hr);
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/**
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* @brief Sets permissions for specified block in IRAM region
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*
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* Sets Read, Write and Execute permission for specified unified-management block (0-3) in given memory region.
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* Applicable only to IRAM memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param block Memory block identifier (0-3)
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* @param write_perm Write permission flag
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* @param exec_perm Execute permission flag
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*/
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void esp_memprot_set_uni_block_perm_iram(mem_type_prot_t mem_type, uint32_t block, bool write_perm, bool read_perm, bool exec_perm);
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/**
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* @brief Sets permissions for high and low memory segment in IRAM region
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*
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* Sets Read, Write and Execute permission for both low and high memory segments given by splitting address.
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* The splitting address must be equal to or higher then beginning of block 5
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* Applicable only to IRAM memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param split_addr Address to split the memory region to lower and higher segment
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param lx Low segment Execute permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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* @param hx High segment Execute permission flag
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*/
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void esp_memprot_set_prot_iram(mem_type_prot_t mem_type, uint32_t *split_addr, bool lw, bool lr, bool lx, bool hw, bool hr, bool hx);
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/**
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* @brief Activates memory protection for all supported memory region types
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*
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* @note The feature is disabled when JTAG interface is connected
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*
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* @param invoke_panic_handler map mem.prot interrupt to ETS_MEMACCESS_ERR_INUM and thus invokes panic handler when fired ('true' not suitable for testing)
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* @param lock_feature sets LOCK bit, see esp_memprot_set_lock() ('true' not suitable for testing)
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* @param mem_type_mask holds a set of required memory protection types (bitmask built of mem_type_prot_t). NULL means default (MEMPROT_ALL in this version)
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*/
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void esp_memprot_set_prot(bool invoke_panic_handler, bool lock_feature, uint32_t *mem_type_mask);
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/**
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* @brief Get permission settings bits for IRAM0 split mgmt. Only IRAM0 memory types allowed
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param lx Low segment Execute permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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* @param hx High segment Execute permission flag
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*/
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void esp_memprot_get_perm_split_bits_iram(mem_type_prot_t mem_type, bool *lw, bool *lr, bool *lx, bool *hw, bool *hr, bool *hx);
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/**
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* @brief Get permission settings bits for DRAM0 split mgmt. Only DRAM0 memory types allowed
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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*/
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void esp_memprot_get_perm_split_bits_dram(mem_type_prot_t mem_type, bool *lw, bool *lr, bool *hw, bool *hr);
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/**
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* @brief Sets permissions for high and low memory segment in PERIBUS1 region
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*
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* Sets Read and Write permission for both low and high memory segments given by splitting address.
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* Applicable only to PERIBUS1 memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param split_addr Address to split the memory region to lower and higher segment
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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*/
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void esp_memprot_set_prot_peri1(mem_type_prot_t mem_type, uint32_t *split_addr, bool lw, bool lr, bool hw, bool hr);
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/**
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* @brief Get permission settings bits for PERIBUS1 split mgmt. Only PERIBUS1 memory types allowed
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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*/
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void esp_memprot_get_perm_split_bits_peri1(mem_type_prot_t mem_type, bool *lw, bool *lr, bool *hw, bool *hr);
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/**
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* @brief Get permission settings bits for PERIBUS2 split mgmt. Only PERIBUS2 memory types allowed
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param lx Low segment Execute permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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* @param hx High segment Execute permission flag
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*/
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void esp_memprot_get_perm_split_bits_peri2(mem_type_prot_t mem_type, bool *lw, bool *lr, bool *lx, bool *hw, bool *hr, bool *hx);
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/**
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* @brief Sets permissions for high and low memory segment in PERIBUS2 region
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*
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* Sets Read Write permission for both low and high memory segments given by splitting address.
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* Applicable only to PERIBUS2 memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param split_addr Address to split the memory region to lower and higher segment
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param lx Low segment Execute permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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* @param hx High segment Execute permission flag
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*/
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void esp_memprot_set_prot_peri2(mem_type_prot_t mem_type, uint32_t *split_addr, bool lw, bool lr, bool lx, bool hw, bool hr, bool hx);
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/**
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* @brief Get permissions for specified memory type. Irrelevant bits are ignored
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lw Low segment Write permission flag
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* @param lr Low segment Read permission flag
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* @param lx Low segment Execute permission flag
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* @param hw High segment Write permission flag
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* @param hr High segment Read permission flag
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* @param hx High segment Execute permission flag
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*/
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void esp_memprot_get_permissions(mem_type_prot_t mem_type, bool *lw, bool *lr, bool *lx, bool *hw, bool *hr, bool *hx);
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/**
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* @brief Get Read permission settings for low and high regions of given memory type
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lr Low segment Read permission flag
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* @param hr High segment Read permission flag
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*/
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void esp_memprot_get_perm_read(mem_type_prot_t mem_type, bool *lr, bool *hr);
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/**
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* @brief Get Write permission settings for low and high regions of given memory type
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lr Low segment Write permission flag
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* @param hr High segment Write permission flag
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*/
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void esp_memprot_get_perm_write(mem_type_prot_t mem_type, bool *lw, bool *hw);
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/**
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* @brief Get Execute permission settings for low and high regions of given memory type
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* Applicable only to IBUS-compatible memory types
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lr Low segment Exec permission flag
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* @param hr High segment Exec permission flag
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*/
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void esp_memprot_get_perm_exec(mem_type_prot_t mem_type, bool *lx, bool *hx);
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/**
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* @brief Returns the lowest address in required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*/
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uint32_t esp_memprot_get_low_limit(mem_type_prot_t mem_type);
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/**
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* @brief Returns the highest address in required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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*/
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uint32_t esp_memprot_get_high_limit(mem_type_prot_t mem_type);
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/**
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* @brief Sets READ permission bit for required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lr Low segment Read permission flag
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* @param hr High segment Read permission flag
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*/
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void esp_memprot_set_read_perm(mem_type_prot_t mem_type, bool lr, bool hr);
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/**
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* @brief Sets WRITE permission bit for required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lr Low segment Write permission flag
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* @param hr High segment Write permission flag
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*/
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void esp_memprot_set_write_perm(mem_type_prot_t mem_type, bool lw, bool hw);
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/**
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* @brief Sets EXECUTE permission bit for required memory region
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*
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* @param mem_type Memory protection area type (see mem_type_prot_t enum)
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* @param lr Low segment Exec permission flag
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* @param hr High segment Exec permission flag
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*/
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void esp_memprot_set_exec_perm(mem_type_prot_t mem_type, bool lx, bool hx);
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#ifdef __cplusplus
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}
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#endif
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