mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-20 01:46:31 +00:00
将内核层空间移动到0xffff800000000000
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@ -6,7 +6,7 @@
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ul Total_Memory = 0;
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ul total_2M_pages = 0;
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static ul root_page_table_phys_addr=0; // 内核层根页表的物理地址
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void mm_init()
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{
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kinfo("Initializing memory management unit...");
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@ -190,7 +190,7 @@ void mm_init()
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}
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global_CR3 = get_CR3();
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//root_page_table_phys_addr = global_CR3;
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kdebug("global_CR3\t:%#018lx", global_CR3);
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kdebug("*global_CR3\t:%#018lx", *phys_2_virt(global_CR3) & (~0xff));
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kdebug("**global_CR3\t:%#018lx", *phys_2_virt(*phys_2_virt(global_CR3) & (~0xff)) & (~0xff));
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@ -539,7 +539,7 @@ void mm_map_phys_addr(ul virt_addr_start, ul phys_addr_start, ul length, ul flag
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{
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global_CR3 = get_CR3();
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// 计算帧缓冲区的线性地址对应的pml4页表项的地址
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// 计算线性地址对应的pml4页表项的地址
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ul *tmp = phys_2_virt((ul *)((ul)global_CR3 & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff));
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if (*tmp == 0)
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{
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@ -566,5 +566,47 @@ void mm_map_phys_addr(ul virt_addr_start, ul phys_addr_start, ul length, ul flag
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set_pdt(tmp1, mk_pdt((ul)phys_addr_start + i, flags));
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}
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flush_tlb();
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}
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/**
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* @brief 将将物理地址填写到进程的页表的函数
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*
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* @param proc_page_table_addr 进程的页表的虚拟基地址
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* @param virt_addr_start 要映射到的虚拟地址的起始位置
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* @param phys_addr_start 物理地址的起始位置
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* @param length 要映射的区域的长度(字节)
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* @param user 用户态是否可访问
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*/
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void mm_map_proc_page_table(ul *proc_page_table_addr, ul virt_addr_start, ul phys_addr_start, ul length, ul flags, bool user)
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{
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// 计算线性地址对应的pml4页表项的地址
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ul *tmp = (ul *)((ul)proc_page_table_addr & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
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if (*tmp == 0)
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{
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ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
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set_pml4t(tmp, mk_pml4t(virt_2_phys(virt_addr), (user ? PAGE_USER_PGT : PAGE_KERNEL_PGT)));
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}
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tmp = (ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff);
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if (*tmp == 0)
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{
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ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
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set_pdpt(tmp, mk_pdpt(virt_2_phys(virt_addr), (user ? PAGE_USER_DIR : PAGE_KERNEL_DIR)));
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}
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ul *tmp1;
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// 初始化2M物理页
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for (ul i = 0; i < (length); i += PAGE_2M_SIZE)
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{
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// 计算当前2M物理页对应的pdt的页表项的物理地址
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tmp1 = ((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr_start + i) >> PAGE_2M_SHIFT) & 0x1ff));
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// 页面写穿,禁止缓存
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set_pdt(tmp1, mk_pdt((ul)phys_addr_start + i, flags | (user ? PAGE_USER_PAGE : PAGE_KERNEL_PAGE)));
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}
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flush_tlb();
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}
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