Re: mac99 SMP

[BALATON Zoltan]

On Sun, 23 Mar 2025, Jd Lyons wrote:
> The Darwin source are vast and I have no idea what I am searching for:

Then keep searching and reading until you understand it more. You can try 
to search for the property names to see where they are queried. The device 
tree is used to build the IO registry so it probably ends up there then 
something might look it up from there. Then see how it's used.

> cpu_sync_timebase(
>         void)
> {
>         natural_t tbu, tbl;
>         boolean_t       intr;
>         struct SIGtimebase      syncClkSpot;
>
>         intr = ml_set_interrupts_enabled(FALSE);                /* No 
> interruptions in here */
>
>         syncClkSpot.avail = FALSE;
>         syncClkSpot.ready = FALSE;
>         syncClkSpot.done = FALSE;
>
>         while (cpu_signal(master_cpu, SIGPcpureq, CPRQtimebase,
>                                                         (unsigned 
> int)&syncClkSpot) != KERN_SUCCESS)
>                 continue;
>
>         while (*(volatile int *)&(syncClkSpot.avail) == FALSE)
>                 continue;
>
>         isync();

This is the beginning of a function without context so I have no idea what 
this is but maybe look for where it's called from and that's probably the 
place you should look more or understand what this function does. If 
there's something in it you don't know then search for that and so on. If 
you don't even understand C then first learn that, there are free 
tutorials online, it should not be too difficult.

Regrads,
BALATON Zoltan