[rtems-docs commit] cpu-supplement: Document PowerPC SPRG0-2 usage

[Sebastian Huber]

Module:    rtems-docs
Branch:    master
Commit:    6297ad31d09bb5c0bddda418881296b7cbd20152
Changeset: http://git.rtems.org/rtems-docs/commit/?id=6297ad31d09bb5c0bddda418881296b7cbd20152

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Thu Nov 10 10:16:03 2016 +0100

cpu-supplement: Document PowerPC SPRG0-2 usage

---

 cpu-supplement/powerpc.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/cpu-supplement/powerpc.rst b/cpu-supplement/powerpc.rst
index b84c2b4..cd7847b 100644
--- a/cpu-supplement/powerpc.rst
+++ b/cpu-supplement/powerpc.rst
@@ -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