diff options
| author | Achin Gupta <achin.gupta@arm.com> | 2013-11-25 18:45:02 +0000 |
|---|---|---|
| committer | Dan Handley <dan.handley@arm.com> | 2013-12-05 12:28:50 +0000 |
| commit | c8afc789196cdd568e29aa1e54cb5d24be5adf70 (patch) | |
| tree | c29ea6f222a2f76cda944ed976b6e734e393732e /common/runtime_svc.c | |
| parent | 994dfceb449a7b2fe34a1febd765cc5291172b39 (diff) | |
psci: fix error due to a non zero context id
In the previous psci implementation, the psci_afflvl_power_on_finish()
function would run into an error condition if the value of the context
id parameter in the cpu_on and cpu_suspend psci calls was != 0. The
parameter was being restored as the return value of the affinity level
0 finisher function. A non zero context id would be treated as an
error condition. This would prevent successful wake up of the cpu from
a power down state. Also, the contents of the general purpose
registers were not being cleared upon return to the non-secure world
after a cpu power up. This could potentially allow the non-secure
world to view secure data.
This patch ensures that all general purpose registers are set to ~0
prior to the final eret that drops the execution to the non-secure
world. The context id is used to initialize the general purpose
register x0 prior to re-entry into the non-secure world and is no
longer restored as a function return value. A platform helper
(platform_get_stack()) has been introduced to facilitate this change.
Change-Id: I2454911ffd75705d6aa8609a5d250d9b26fa097c
Diffstat (limited to 'common/runtime_svc.c')
| -rw-r--r-- | common/runtime_svc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/common/runtime_svc.c b/common/runtime_svc.c index 0aa4460f..431cfa3c 100644 --- a/common/runtime_svc.c +++ b/common/runtime_svc.c @@ -38,6 +38,7 @@ #include <semihosting.h> #include <bl_common.h> #include <psci.h> +#include <runtime_svc.h> /******************************************************************************* * Perform initialization of runtime services possibly across exception levels |