On Wed, 2014-05-28 at 15:36 -0400, Kevin O'Connor wrote:
> On Mon, May 19, 2014 at 07:49:47PM +0100, David Woodhouse wrote:
> > On Mon, 2014-05-19 at 13:42 -0400, Kevin O'Connor wrote:
> > > I don't see any reference to "int 15h, ax=0xd042" as a standard. So,
> > > maybe the author of the above text also wrote their own EFI module
> > > which used that magic value?
> >
> > Well, the INT 15h call would still be on the BIOS side; that doesn't
> > sound like an EFI thing at all. Perhaps that's a special-case hack to
> > make their platform *trigger* the SMM entry, which then gets handled by
> > the EFI code?
>
> FYI, I just stumbled upon this definition in the std/LegacyBios.h efi
> header file:
>
> ///
> /// SMM_FUNCTION Function constants.
> ///@{
> #define INT15_D042 0x0000
> [...]Looks like it's for BIOS updates. See ยง8.4 of http://docs.com/Z1P8 -- dwmw2
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