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(monolithickernel)，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。
Recall that kernel mode represents the privileged mode for code execution, while user mode represents the non-privileged mode (for programs running outside the kernel).
回想一下内核模式表示代码执行的特权模式，而用户模式则表示非特权模式（用于那些运行在内核之外的程序）。
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.
内核空间被标记在页表中的独家特权代码(环2或更低)，因此一个页面故障被触发，如果用户模式的程序试图去触摸它。
Many of these transition into privileged mode, perform the operation, and smoothly return to user mode.
这些常式的大部分会转换为授权模式、执行作业，并且顺利地回到使用者模式。
Many of these transition into privileged mode, perform the operation, and smoothly return to user mode.
这些常式的大部分会转换为授权模式、执行作业，并且顺利地回到使用者模式。
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