A 64-bit application can directly access 4 exabytes of virtual memory, and the Intel Itanium processor provides a contiguous linear address space.
位的应用程序可以直接访问4eb的虚拟内存，Intel Itanium处理器提供了连续的线性地址空间。
Within a driver, the mmap function is implemented through the remap_pfn_range kernel function, which provides a linear mapping of device memory into a user's address space.
在一个驱动程序中，mmap函数通过remap _ pfn_range内核函数实现，它提供设备内存到用户地址空间的线性映射。
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