115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-12-06 WangXiaoyao the first version
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*/
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#ifndef __MM_FAULT_H__
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#define __MM_FAULT_H__
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#include <rtthread.h>
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#include <stddef.h>
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#include <stdint.h>
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/* fast path fault handler, a page frame on kernel space is returned */
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#define MM_FAULT_STATUS_OK 0
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/* customized fault handler, done by using rt_varea_map_* */
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#define MM_FAULT_STATUS_OK_MAPPED 1
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#define MM_FAULT_STATUS_UNRECOVERABLE 4
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#define MM_FAULT_FIXABLE_FALSE 0
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#define MM_FAULT_FIXABLE_TRUE 1
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enum rt_mm_fault_op
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{
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MM_FAULT_OP_READ = 1,
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MM_FAULT_OP_WRITE,
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MM_FAULT_OP_EXECUTE,
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};
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enum rt_mm_fault_type
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{
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/**
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* Occurs when an instruction attempts to access a memory address that it
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* does not have permission to access
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*/
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MM_FAULT_TYPE_ACCESS_FAULT,
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/**
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* Occurs when a load or store instruction accesses a virtual memory
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* address that is not currently mapped to a physical memory page
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*/
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MM_FAULT_TYPE_PAGE_FAULT,
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/**
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* Occurs like a SIGBUS
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*/
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MM_FAULT_TYPE_BUS_ERROR,
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MM_FAULT_TYPE_GENERIC,
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__PRIVATE_PAGE_INSERT,
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};
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enum rt_mm_hint_prefetch
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{
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MM_FAULT_HINT_PREFETCH_NONE,
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MM_FAULT_HINT_PREFETCH_READY,
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};
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struct rt_mm_fault_res
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{
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void *vaddr;
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rt_size_t size;
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int status;
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/* hint for prefetch strategy */
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enum rt_mm_hint_prefetch hint;
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};
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struct rt_aspace_fault_msg
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{
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enum rt_mm_fault_op fault_op;
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enum rt_mm_fault_type fault_type;
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rt_size_t off;
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void *fault_vaddr;
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struct rt_mm_fault_res response;
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};
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struct rt_aspace_io_msg
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{
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/* offset in varea */
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rt_size_t off;
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/* fault address in target address space */
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void *fault_vaddr;
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/* read/write buffer in kernel space */
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void *buffer_vaddr;
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struct rt_mm_fault_res response;
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};
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rt_inline void rt_mm_fault_res_init(struct rt_mm_fault_res *res)
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{
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res->vaddr = RT_NULL;
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res->size = 0;
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res->hint = MM_FAULT_HINT_PREFETCH_NONE;
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res->status = MM_FAULT_STATUS_UNRECOVERABLE;
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}
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rt_inline void rt_mm_io_msg_init(struct rt_aspace_io_msg *io, rt_size_t off, void *fault_vaddr, void *buffer_vaddr)
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{
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io->off = off;
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io->fault_vaddr = fault_vaddr;
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io->buffer_vaddr = buffer_vaddr;
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rt_mm_fault_res_init(&io->response);
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}
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struct rt_aspace;
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/* MMU base page fault handler, MM_FAULT_FIXABLE_TRUE/MM_FAULT_FIXABLE_FALSE will be returned */
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int rt_aspace_fault_try_fix(struct rt_aspace *aspace, struct rt_aspace_fault_msg *msg);
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#endif /* __MM_FAULT_H__ */
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