Il Saturday 08 September 2007 19:40:20 Atsushi Nemoto ha scritto:
> > diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
> > index 6379003..75a46ba 100644
> > --- a/arch/mips/kernel/traps.c
> > +++ b/arch/mips/kernel/traps.c
> > @@ -1075,9 +1075,23 @@ void *set_except_vector(int n, void *addr)
> >
> > exception_handlers[n] = handler;
> > if (n == 0 && cpu_has_divec) {
> > +#ifdef CONFIG_AR7
> > + /* lui k0, 0x0000 */
> > + *(volatile u32 *)(CAC_BASE+0x200) =
> > + 0x3c1a0000 | (handler >> 16);
> > + /* ori k0, 0x0000 */
> > + *(volatile u32 *)(CAC_BASE+0x204) =
> > + 0x375a0000 | (handler & 0xffff);
> > + /* jr k0 */
> > + *(volatile u32 *)(CAC_BASE+0x208) = 0x03400008;
> > + /* nop */
> > + *(volatile u32 *)(CAC_BASE+0x20C) = 0x00000000;
> > + flush_icache_range(CAC_BASE+0x200, CAC_BASE+0x210);
> > +#else
> > *(volatile u32 *)(ebase + 0x200) = 0x08000000 |
> > (0x03ffffff & (handler >> 2));
> > flush_icache_range(ebase + 0x200, ebase + 0x204);
> > +#endif
> > }
> > return (void *)old_handler;
> > }
>
> Runtime checking, something like this would be better than ifdef:
>
> if ((handler ^ (ebase + 4)) & 0xfc000000)
> /* use jr */
> ...
> } else {
> /* use j */
> ...
> }
This will not make the code bigger? What's wrong with #ifdef?
