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Diffstat (limited to 'docs/interrupt-framework-design.rst')
| -rw-r--r-- | docs/interrupt-framework-design.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/interrupt-framework-design.rst b/docs/interrupt-framework-design.rst index 940bc24f..d5654870 100644 --- a/docs/interrupt-framework-design.rst +++ b/docs/interrupt-framework-design.rst @@ -151,6 +151,10 @@ EL3 interrupts in Secure-EL1/Secure-EL0 is in control of how its execution is preempted by EL3 interrupt and can handover the interrupt to EL3 for handling. + However, when ``EL3_EXCEPTION_HANDLING`` is ``1``, this routing model is + invalid as EL3 interrupts are unconditionally routed to EL3, and EL3 + interrupts will always preempt Secure EL1/EL0 execution. + #. **CSS=0, TEL3=1**. Interrupt is routed to EL3 when execution is in Secure-EL1/Secure-EL0. This is a valid routing model as secure software in EL3 can handle the interrupt. |