110 lines
2.2 KiB
C
110 lines
2.2 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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* 2022-11-30 WangXiaoyao the first version
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*/
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#include <rtthread.h>
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#include "mm_aspace.h"
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#include "mm_fault.h"
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#include "mm_page.h"
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#include <mmu.h>
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#define DBG_TAG "mm.object"
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#define DBG_LVL DBG_INFO
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#include "rtdbg.h"
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static const char *get_name(rt_varea_t varea)
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{
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return "dummy-mapper";
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}
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void rt_varea_insert_page(rt_varea_t varea, void *page_addr)
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{
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rt_page_t page = rt_page_addr2page(page_addr);
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if (varea->frames == NULL)
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{
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varea->frames = page;
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page->next = NULL;
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}
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else
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{
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varea->frames->pre = page;
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page->next = varea->frames;
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varea->frames = page;
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}
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}
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void rt_varea_free_pages(rt_varea_t varea)
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{
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rt_page_t page = varea->frames;
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while (page)
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{
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rt_page_t next = page->next;
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void *pg_va = rt_page_page2addr(page);
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rt_pages_free(pg_va, 0);
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page = next;
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}
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}
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void rt_varea_offload_page(rt_varea_t varea, void *vaddr, rt_size_t size)
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{
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void *vend = vaddr + size;
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while (vaddr != vend)
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{
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rt_page_t page = rt_page_addr2page(vaddr);
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page->pre->next = page->next;
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page->next->pre = page->pre;
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rt_pages_free(vaddr, 0);
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vaddr += ARCH_PAGE_SIZE;
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}
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}
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static void on_page_fault(struct rt_varea *varea, struct rt_mm_fault_msg *msg)
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{
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void *page;
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page = rt_pages_alloc(0);
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if (!page)
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{
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LOG_W("%s: page alloc failed", __func__);
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return;
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}
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msg->response.status = MM_FAULT_STATUS_OK;
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msg->response.size = ARCH_PAGE_SIZE;
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msg->response.vaddr = page;
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rt_varea_insert_page(varea, page);
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}
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static void on_varea_open(struct rt_varea *varea)
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{
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varea->data = NULL;
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}
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static void on_varea_close(struct rt_varea *varea)
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{
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}
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static void on_page_offload(rt_varea_t varea, void *vaddr, rt_size_t size)
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{
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rt_varea_offload_page(varea, vaddr, size);
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}
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struct rt_mem_obj rt_mm_dummy_mapper = {
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.get_name = get_name,
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.on_page_fault = on_page_fault,
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.hint_free = NULL,
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.on_varea_open = on_varea_open,
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.on_varea_close = on_varea_close,
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.on_page_offload = on_page_offload,
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};
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