HPET: Difference between revisions

 

General initialization:

1. Find HPET base address in 'HPET' ACPI table.

2. Calculate HPET frequency (f = 10^15 / period).

3. Save minimal tick (either from ACPI table or configuration register).

4. Initialize comparators.

5. Set ENABLE_CNF bit.

 

Timer N initialization:

1. Determine if timer N is periodic capable, save that information to avoid re-reading it every time.

2. Determine allowed interrupt routing for current timer and allocate an interrupt for it.