> The original hp300 code does not use trap 12 (assuming you refer to the
> processor trap #, not the one in trap.h) for anything.

Hm.. how far back did you go check this out? I just looked at
arch/hp300/locore.s, and this is what I found:
/*
 * Trap 12 is the entry point for the cachectl "syscall" (both HPUX & BSD)
 *      cachectl(command, addr, length)
 * command in d0, addr in a1, length in d1
 */
        .globl  _cachectl
_trap12:

Doesn't look too new to me.

-Markus
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