When the ppe wants to access the mailbox, it needs to have access to the memory-mapped register space, which is normally only available to kernel space.
当PPE希望访问邮箱时，它需要能够访问内存映射的寄存器空间，后者通常只对于内核空间来说是可用的。
Regions in a process's virtual address space can be mapped to physical memory, to a file, or to any other addressable storage.
进程的虚拟地址空间中的区域可被映射到物理内存、文件或任何其他可寻址存储。
Figure 1 illustrates how virtual pages in a process's address space are mapped to physical page frames in memory.
图1说明了进程地址空间中的虚拟页如何映射到内存中的物理页帧。
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