First is the concept of a 32-bit address space, as opposed to a 64-bit address space.

相对于64位地址空间，我们首先来看一下32位地址空间这个概念。

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Hence we have a 36-bit address, aligned to 8 bytes, for a total of 64gb addressable physical memory.

因此，我们有了36位地址，和8字节保持了一致，总共64gb的物理内存都是可寻址的。

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Remember, the first parameter to the function is the 64-bit address that was passed in from the PPE.

记住，到此函数的第一个参数是传递自ppe的64位地址。

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When Vint and his colleagues chose that 32-bit address space they thought they were just making a simple engineering tradeoff based on a seemingly predictable future.

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The President talked about this a little bit in the weekly address last week, as well.

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