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64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*
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* Copyright 2024 Google LLC
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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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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "freertos_types.h"
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typedef enum MpuCachePolicy {
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MpuCachePolicy_Invalid,
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MpuCachePolicy_NotCacheable,
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MpuCachePolicy_WriteThrough,
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MpuCachePolicy_WriteBackWriteAllocate,
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MpuCachePolicy_WriteBackNoWriteAllocate,
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MpuCachePolicyNum
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} MpuCachePolicy;
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typedef struct MpuRegion {
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uint8_t region_num:4;
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bool enabled:1;
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uintptr_t base_address;
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uint32_t size;
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uint8_t disabled_subregions; // 8 bits, each disables 1/8 of the region.
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MpuCachePolicy cache_policy;
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bool priv_read:1;
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bool priv_write:1;
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bool user_read:1;
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bool user_write:1;
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} MpuRegion;
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void mpu_enable(void);
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void mpu_disable(void);
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void mpu_set_region(const MpuRegion* region);
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MpuRegion mpu_get_region(int region_num);
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void mpu_get_register_settings(const MpuRegion* region, uint32_t *base_address_reg,
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uint32_t *attributes_reg);
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void mpu_set_task_configurable_regions(MemoryRegion_t *memory_regions,
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const MpuRegion **region_ptrs);
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bool mpu_memory_is_cachable(const void *addr);
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void mpu_init_region_from_region(MpuRegion *copy, const MpuRegion *from, bool allow_user_access);
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