Is it possible to execute an IRQ in EL3 (secure monitor) if IRQ was fired in EL1 context? E.g. I have entered EL1 via spsr_el3 (el1h selected) and after that setup a vector table with vbar_el1. Now, some IRQs I want to execute in EL3 mode. How can I do that?
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What you want is called "Physical IRQ Routing", and is controlled via
scr_el3. From the manual:IRQ, bit [1] Physical IRQ Routing. 0b0 When executing at Exception levels below EL3, physical IRQ interrupts are not taken to EL3. When executing at EL3, physical IRQ interrupts are not taken. 0b1 When executing at any Exception level, physical IRQ interrupts are taken to EL3.If you only want to handle some IRQs at EL3 and leave others to EL1, then you can simply handle that in the EL3 exception vector by setting:
spsr_el1tospsr_el3.elr_el1toelr_el3.elr_el3tovbar_el1plus one of0x80/0x280/0x480/0x680depending on the state bits inspsr_el3.spsr_el3 = (spsr_el3 & ~0xf00fff) | 0x3c5. If your architecture has PAN support, you'll also have to checkspsr_el1for theSPANfield, and if that's zero, OR0x400000intospsr_el3.