Re: [elysium-developers] User-level IRQ handling added

[Adam L. <ag...@li...>]

On Thu, Feb 17, 2000 at 02:58:03PM +0100, Kasper Verdich Lund wrote:
> > > We still need to work on PCT (protected control transfer) - anyone?
> >=20
> > [snip] I've lost my Insight CD (damm!) but can you explain how the upca=
lling works? I've only used TSS before.
> >=20
> > popl %eax
> > popl %eax
> > movl %cr3,%eax
> > iret
> >=20
> > I think that's the code (from memory), it sets up the page tables but d=
oes the iret pop stuff off the argument stack? And does that drop the prive=
lage level?
>=20
> The code is correct. It doesn't set up any page tables, but it does
> change the page directory. The assembly code you've included in your
> posting is the implementation of a function with the following
> prototype:
>=20
> extern void _process_run(uint32_t cr3, uint32_t eip, uint32_t cs,=20
>                          uint32_t eflags, uint32_t esp,=20
>                          uint32_t ss) __attribute__ ((noreturn));
>=20

AH! Missed that ;) Sorry, everything is clear now

AGL

--=20
Smoking is one of the leading causes of statistics.