[edk2-devel] Question regarding the PI timer architectural protocols

[edk2-devel] Question regarding the PI timer architectural protocols

[Pedro Falcato]

Hi,

I'm trying to write an EFI application[1] to sample the program
counter, using a timer. I want to grab the EFI_SYSTEM_CONTEXT (for
sampling) on timer interrupts. However:

1) Regular event-based SetTimer does not pass me this information
2) EFI timer architectural protocols also do not seem to pass this.
EFI_TIMER_ARCH_PROTOCOL.RegisterHandler() takes a VOID
(EFIAPI *EFI_TIMER_NOTIFY) (
  IN UINT64  Time
  );

AKA not good.

Am I missing something? Is the only option to register my own
interrupt handler using EFI_CPU_ARCH_PROTOCOL, while using another
timer and praying that the firmware isn't using it itself?

[1] I would really prefer to keep it an EFI application, even while
using DXE protocols, as I'd like for this to be usable without needing
to rebuild firmware

-- 
Pedro


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