#03-2-spoc-discussion.md 的问题文件 有一台假想的计算机，页大小（page size）为32 Bytes，支持32KB的虚拟地址空间（virtual address space）,有4KB的物理内存空间（physical memory），采用二级页表，一个页目录项（page directory entry ，PDE）大小为1 Byte,一个页表项（page-table entries， PTEs）大小为1 Byte，1个页目录表大小为32 Bytes，1个页表大小为32 Bytes。页目录基址寄存器（page directory base register，PDBR）保存了页目录表的物理地址（按页对齐），其值为0x220（十进制为544），
4KB的物理内存布局和具体值如下：
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请回答下列虚地址是否有合法对应的物理内存，请给出对应的pde index, pde contents, pte index, pte contents。
Virtual Address 6c74
Virtual Address 6b22
Virtual Address 03df
Virtual Address 69dc
Virtual Address 317a
Virtual Address 4546
Virtual Address 2c03
Virtual Address 7fd7
Virtual Address 390e
Virtual Address 748b
比如答案可以如下表示：
Virtual Address 7570:
--> pde index:0x1d pde contents:(valid 1, pfn 0x33)
--> pte index:0xb pte contents:(valid 0, pfn 0x7f)
--> Fault (page table entry not valid)
Virtual Address 21e1:
--> pde index:0x8 pde contents:(valid 0, pfn 0x7f)
--> Fault (page directory entry not valid)
Virtual Address 7268:
--> pde index:0x1c pde contents:(valid 1, pfn 0x5e)
--> pte index:0x13 pte contents:(valid 1, pfn 0x65)
--> Translates to Physical Address 0xca8 --> Value: 16