Porting guide: Clarify API that don't follow AAPCS
This patch clarifies a porting API in the Porting Guide that do not
follow the ARM Architecture Program Calling Standards (AAPCS). The
list of registers that are allowed to be clobbered by this API has
been updated in the Porting Guide.
Fixes ARM-software/tf-issues#259
Change-Id: Ibf2adda2e1fb3e9b8f53d8a918d5998356eb8fce
diff --git a/docs/porting-guide.md b/docs/porting-guide.md
index 56ddbb1..d19811d 100644
--- a/docs/porting-guide.md
+++ b/docs/porting-guide.md
@@ -642,7 +642,8 @@
per-CPU stacks). This function will be invoked very early in the
initialization sequence which mandates that this function should be
implemented in assembly and should not rely on the avalability of a C
-runtime environment.
+runtime environment. This function can clobber x0 - x8 and must preserve
+x9 - x29.
This function plays a crucial role in the power domain topology framework in
PSCI and details of this can be found in [Power Domain Topology Design].
