Thanks a lot Michael !!..
A lot of information to understand and study.
Att.
Rafael R. Machado
2013/10/8 Kinney, Michael D <[email protected]>
> Hello,****
>
> ** **
>
> Yes. It is possible to implement a filter driver for any UEFI Protocol
> for I/O services. The basic algorithm is to implement a driver that
> follows the UEFI Driver Model and produces the Driver Binding Protocol.
> The driver type is a bus driver because it must to create a new child
> handle to install protocol that provides the filter. The Start() function
> opens the parent protocol being filtered BY_DRIVER and creates a child
> handle with a Device Path Protocol and the protocol that provide the filter
> of the opened protocol on the parent handle. The Device Path Protocol is
> generated by appending a VenHw() device path node to the parent handle’s
> device path. You can just use gEfiCallerIdGuid in the VenHw() node. You
> also need to install a tag GUID (can use gEfiCallerIdGuid again) onto the
> child handle and your Start() function should return EFI_UNSUPPORTED if the
> tag GUID is present. This is required so your filter driver does not do an
> infinite recursion of adding the filter on top of a filter on top of a
> filter.****
>
> ** **
>
> As noted below, if you soft load your filter driver from the shell, then
> you may need to use the “reconnect” command to get your filter driver to
> get added to the I/O driver stacks correctly if the protocol you want to
> filter is already opened BY_DRIVER by another driver. If your driver is
> loaded as part of the Driver#### options with the reconnect flag set, then
> the UEFI Boot Manager will take care of getting it loaded and connected
> correctly.****
>
> ** **
>
> Best regards,****
>
> ** **
>
> Mike****
>
> ** **
>
> *From:* Rafael Machado [mailto:[email protected]]
> *Sent:* Tuesday, October 08, 2013 8:51 AM
>
> *To:* edk2-devel
> *Subject:* Re: [edk2] Doubt about drivers at UEFI****
>
> ** **
>
> Is it possible to do this in a uefi script (startup.nsh)?****
>
> ** **
>
> Att.****
>
> Rafael R. Machado****
>
> ** **
>
> 2013/10/8 Carsey, Jaben <[email protected]>****
>
> The hard part is about repeating the process. You would have to manually
> do it each time based on this method.****
>
> ****
>
> -Jaben****
>
> ****
>
> *From:* Rafael Machado [mailto:[email protected]]
> *Sent:* Tuesday, October 08, 2013 6:59 AM
> *To:* edk2-devel****
>
>
> *Subject:* Re: [edk2] Doubt about drivers at UEFI****
>
> ****
>
> Jarben****
>
> So the idea would be, using the uefi shell, disconnect a driver from a
> device and load a new driver from the usb stick.****
>
> Sorry, but I didn't see what is the hard part of loading the driver from
> the usb stick.****
>
> Could you please explain me what is the difficult of this ? As far as I
> know I'd just need to load the new driver and run the connect -r from a
> UEFI shell. Right ?****
>
> ****
>
> Thanks everyone****
>
> Rafael R. Machado****
>
> ****
>
> ****
>
> ****
>
> ****
>
> 2013/10/7 Carsey, Jaben <[email protected]>****
>
> You could actually write a driver that would meet the original request.
> You’d have to disconnect the drive stack partially and then add yours and
> then reconnect the stack. ****
>
> ****
>
> The adding to the platform via USB seems a bigger challenge since that
> feature may or may not be available.****
>
> ****
>
> -Jaben****
>
> ****
>
> *From:* Deric Cole [mailto:[email protected]]
> *Sent:* Monday, October 07, 2013 2:09 PM****
>
>
> *To:* [email protected]
> *Subject:* Re: [edk2] Doubt about drivers at UEFI****
>
> ****
>
> You could write a driver that *replaces* the original driver in order to
> add value – but that means you would have to duplicate all of the original
> functionality in your driver.****
>
>
>
> ****
>
> Deric Cole****
>
> Sr. Customer Engineer****
>
> Phoenix Technologies Ltd.****
>
> ****
>
> *From:* Igor Sharovar
> [mailto:[email protected]<[email protected]>]
>
> *Sent:* Monday, October 07, 2013 1:43 PM
> *To:* [email protected]
> *Subject:* Re: [edk2] Doubt about drivers at UEFI****
>
> ****
>
> No, it is not possible. There is not a filter driver in UEFI like Windows
> has. ** **
>
> Igor Sharovar****
>
> ****
>
> On Sat, Oct 5, 2013 at 1:05 PM, Rafael Machado <
> [email protected]> wrote:****
>
> Hi everyone****
>
> ****
>
> I've being studied uefi for some time and I'd like to know, if is it
> possible to create something like a windows filter driver at UEFI.****
>
> For example, create a keyboard filter driver, that will log everything
> that was typed to a logfile.****
>
> I think this because at UDK2010 there are some drivers, and I'd like to
> know if is it possible to change some of these drivers, and load them on a
> system from a USB stick.****
>
> Is it possible ?****
>
> ****
>
> Thanks everyone****
>
> Rafael R. Machado****
>
>
>
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>
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> ****
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>
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> ** **
>
>
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