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cpu-supplement: Document PowerPC SPRG0-2 usage

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Sebastian Huber 2016-11-10 10:16:03 +01:00
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cpu-supplement/powerpc.rst
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@ -270,6 +270,17 @@ Special Registers
The PowerPC architecture includes a number of special registers which are
critical to the programming model:
*Special-Purpose Register General 0 (SPRG0)*
On SMP configurations, this register contains the address of the per-CPU
control of the processor.
*Special-Purpose Register General 1 (SPRG1)*
This register contains the interrupt stack pointer for the outer-most
interrupt service routine.
*Special-Purpose Register General 2 (SPRG2)*
This register contains the address of interrupt stack area begin.
*Machine State Register*
The MSR contains the processor mode, power management mode, endian mode,
exception information, privilege level, floating point available and