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
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common/psci/psci_afflvl_on.c |
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common/psci/psci_afflvl_suspend.c |
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common/psci/psci_common.c |
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common/psci/psci_entry.S |
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common/psci/psci_private.h |
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common/runtime_svc.c |
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docs/change-log.md |
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docs/porting-guide.md |
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plat/common/aarch64/platform_helpers.S |
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plat/fvp/platform.h |
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