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3b586c8e29
Invoke INT 1a,564e whenever a PXE stack is activated, passing the
address of the PXENV+ structure in %es:%bx. This is designed to allow
a BIOS to be notified when a PXE stack has been installed, providing
an opportunity for start-of-day commands such as setting the MAC
address according to a policy chosen by the BIOS.
PXE defines INT 1a,5650 as a means of locating the PXENV+ structure:
this call returns %ax=0x564e and the address of the PXENV+ structure
in %es:%bx. We choose INT 1a,564e as a fairly natural notification
call, using the parameters as would be returned by INT 1a,5650.
The full calling convention (documented as per section 3.1 of the PXE
specification) is:
INT 1a,564e - PXE installation notification
Enter:
%ax = 0x564e
%es = 16-bit segment address of the PXENV+ structure
%bx = 16-bit offset of the PXENV+ structure
Exit:
%edx may be trashed (as is the case for INT 1a,5650)
All other register contents must be preserved
CF is cleared
IF is preserved
All other flags are undefined
Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org