UEFI driver, win8, talking?

NTDEV
1

Hi,

Learning UEFI, got a basic helloworld EBC BIOS driver working, can load into uefi shell, invoke it’s published protocol interface via an efi application (before booting windows). One of the calls simply return a calls counter (dword).

There is no memory, i/o or IRQ resources allocated to driver and so does not talk to real hardware. Normally I understand that I’d use these mapped resources to communicate or the old real mode s/w interrrupts, INT10,12,13, 21 etc.

How do I query my UEFI protocol interface from Windows 8 and invoke it? It is EBC code not X86. Do I have to write a WDF driver to support this UEFI bios driver? If so can it be UMDF?

Anything to get me going would be much appreciated.

Regards,

dc

2

You get to write a completely separate driver for your operating system. Your DXE driver is long gone after OS handoff.

If you need OS-BIOS communication your options are limited and circumstantial. Don’t approach SMI as a solution for a path of regular communication.

3

UEFI only allows UNDI network drivers to keep running once the OS has loaded (http://www.intel.com/content/dam/doc/guide/uefi-driver-network-boot-devices-guide.pdf). Otherwise, you’re limited to just getting and setting variables from within the OS.

–
Bruce

On Jul 25, 2014, at 2:35 AM, xxxxx@hotmail.com wrote:

Hi,

Learning UEFI, got a basic helloworld EBC BIOS driver working, can load into uefi shell, invoke it’s published protocol interface via an efi application (before booting windows). One of the calls simply return a calls counter (dword).

There is no memory, i/o or IRQ resources allocated to driver and so does not talk to real hardware. Normally I understand that I’d use these mapped resources to communicate or the old real mode s/w interrrupts, INT10,12,13, 21 etc.

How do I query my UEFI protocol interface from Windows 8 and invoke it? It is EBC code not X86. Do I have to write a WDF driver to support this UEFI bios driver? If so can it be UMDF?

Anything to get me going would be much appreciated.

Regards,

dc

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