42d0e356c2
This is preparation for moving address environments out of the group structure into the tcb. Why move ? Because the group is destroyed very early in the exit phase, but the MMU mappings are needed until the context switch to the next process is complete. Otherwise the MMU will lose its mappings and the system will crash.
140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/****************************************************************************
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* arch/arm64/include/arch.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This file should never be included directly but, rather,
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* only indirectly through nuttx/arch.h
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*/
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#ifndef __ARCH_ARM64_INCLUDE_ARCH_H
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#define __ARCH_ARM64_INCLUDE_ARCH_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef __ASSEMBLY__
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# include <stdint.h>
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# include <nuttx/pgalloc.h>
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# include <nuttx/addrenv.h>
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#endif
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/****************************************************************************
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* Pre-processor Prototypes
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****************************************************************************/
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#ifdef CONFIG_ARCH_ADDRENV
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#if CONFIG_MM_PGSIZE != 4096
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# error Only pages sizes of 4096 are currently supported (CONFIG_ARCH_ADDRENV)
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#endif
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#endif /* CONFIG_ARCH_ADDRENV */
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifdef CONFIG_ARCH_ADDRENV
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/* The task group resources are retained in a single structure, task_group_s
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* that is defined in the header file nuttx/include/nuttx/sched.h. The type
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* arch_addrenv_t must be defined by platform specific logic in
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* nuttx/arch/<architecture>/include/arch.h.
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*
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* These tables would hold the physical address of the level 2 page tables.
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* All would be initially NULL and would not be backed up with physical
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* memory until mappings in the level 2 page table are required.
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*/
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struct arch_addrenv_s
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{
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/* Level 1 page table entries for each group section */
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uintptr_t *text[ARCH_TEXT_NSECTS];
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uintptr_t *data[ARCH_DATA_NSECTS];
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#ifdef CONFIG_BUILD_KERNEL
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uintptr_t *heap[ARCH_HEAP_NSECTS];
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#ifdef CONFIG_ARCH_VMA_MAPPING
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uintptr_t *shm[ARCH_SHM_NSECTS];
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#endif
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/* Initial heap allocation (in bytes). This exists only provide an
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* indirect path for passing the size of the initial heap to the heap
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* initialization logic. These operations are separated in time and
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* architecture. REVISIT: I would like a better way to do this.
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*/
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size_t heapsize;
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#endif
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};
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typedef struct arch_addrenv_s arch_addrenv_t;
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/* This type is used when the OS needs to temporarily instantiate a
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* different address environment. Used in the implementation of
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*
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* int up_addrenv_select(arch_addrenv_t addrenv, save_addrenv_t *oldenv);
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* int up_addrenv_restore(save_addrenv_t oldenv);
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*
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* In this case, the saved value in the L1 page table are returned
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*/
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struct save_addrenv_s
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{
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uint32_t text[ARCH_TEXT_NSECTS];
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uint32_t data[ARCH_DATA_NSECTS];
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#ifdef CONFIG_BUILD_KERNEL
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uint32_t heap[ARCH_HEAP_NSECTS];
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#ifdef CONFIG_ARCH_VMA_MAPPING
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uint32_t shm[ARCH_SHM_NSECTS];
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#endif
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#endif
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};
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typedef struct save_addrenv_s save_addrenv_t;
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ARCH_ARM64_INCLUDE_ARCH_H */
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