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Diffstat (limited to 'documentation/interrupt_handling.md')
| -rw-r--r-- | documentation/interrupt_handling.md | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/documentation/interrupt_handling.md b/documentation/interrupt_handling.md index 7ca8121..8063357 100644 --- a/documentation/interrupt_handling.md +++ b/documentation/interrupt_handling.md @@ -19,8 +19,18 @@ The processor is configured to use: * Monitor vector for SMC exceptions * State vector for IRQ exceptions -Interrupts handled by secure world are sent as FIQs and interrupts handled -by normal world are sent as IRQs. +Two types of interrupt are defined in optee_os: +* Native interrupt - The interrupt handled by optee_os + (for example: secure interrupt) +* Foreign interrupt - The interrupt not handled by optee_os + (for example: non-secure interrupt which is handled by normal world) + +For ARM GICv2 mode, native interrupt is sent as FIQ and foreign interrupt is +sent as IRQ. + +For ARM GICv3 mode, foreign interrupt is sent as FIQ which could be handled +by either secure world (EL3 in AArch64) or normal world. This mode is not +supported yet. Since IRQs are received using the state vector the actual vector used depends on the current state of the CPU. If the NS (non-secure) bit in SCR |