THe driver image handle
On 09/04/20 13:04, Tomas Pilar (tpilar) wrote:
Hi Libo,See also the EfiTestManagedDevice() and EfiTestChildHandle() utility
functions in UefiLib.
Tomas Pilar (tpilar)
Hi Libo,toggle quoted messageShow quoted text
The convention says that when a driver manages a device, it should find the
relevant IO protocol installed on the device handle (for example a PCI
device will have EFI_PCI_IO_PROTOCOL) and open it using
the EFI_OPEN_PROTOCOL_BY_DRIVER attribute. The driver will keep the
protocol open for the entire duration while it manages the device. You can
use boot services (UefiBootServicesTableLib.h), in particular the
gBS->OpenProtocolInformation() function, to inspect who has a specific
protocol on a specific handle open and with what attributes.
Now, if you are a user and you boot into UEFI shell, all you have to do is
inspect the (shell) handle using the 'dh -d -v <handle>' command.
On Fri, Sep 4, 2020 at 2:43 AM Feng Libo <lbfeng@...> wrote:
Feng Libo <lbfeng@...>
I have a problem:
Given a device handle, How to find the driver image handles that are managing the controller? The drivers are compliant to the UEFI driver model.
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