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Diffstat (limited to 'docs/porting-guide.md')
| -rw-r--r-- | docs/porting-guide.md | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md index 004f70d6..bd1b4489 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -654,7 +654,8 @@ CPU-specific linear index into blocks of memory (for example while allocating 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]. @@ -782,6 +783,20 @@ Possible errors reported by the generic code are: The default implementation simply spins. +### Function : plat_panic_handler() + + Argument : void + Return : void + +This API is called when the generic code encounters an unexpected error +situation from which it cannot recover. This function must not return, +and must be implemented in assembly because it may be called before the C +environment is initialized. + +Note: The address from where it was called is stored in x30 (Link Register). + +The default implementation simply spins. + 3. Modifications specific to a Boot Loader stage ------------------------------------------------- |