Some kernel code is needed to use the SPUs from a Linux application, since the controlling registers are only accessible from the PPE in privileged mode.
在 Linux 程序中使用 SPU 需要使用一部分内核代码，因为控制寄存器只能从 PPE 中使用特权模式进行访问。
The Linux kernel is what's known as a monolithic kernel, which means that the majority of the operating system functionality is called the kernel and runs in a privileged mode.
Linux就是通常所说的单内核(monolithic kernel)，即操作系统的大部分功能都被称为内核，并在特权模式下运行。
Kernel space is flagged in the page tables as exclusive to privileged code (ring 2 or lower), hence a page fault is triggered if user-mode programs try to touch it.
系统内核所使用的内存空间通过特权码（privileged code，2级或者更低）来标记，以防止用户模式的程序访问到内核空间而发生页面错误。
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