Chip,
Thanks for the response, I am able to pass the address through my controller
firmware (UEFI driver and OS driver can handshake with controller firmware for
the address) but my question is, is it legal to access. I am seeing some
issues when IOMMU comes into picture, it consider the address is reserved (from
memory map) and faults the access from my OS driver.
Thanks
Sathya
From: Chip Ueltschey [mailto:[email protected]]
Sent: Wednesday, May 15, 2013 4:16 PM
To: [email protected]
Subject: Re: [edk2] Memory reserved using EfiRuntimeServicesData and IOMMU
Sathya,
You need a way to pass the address to your OS. The memory is already there.
You could use a variable, but you need to have a pointer to variable services.
You can store the information in ASL. Non-trivial to make this work, but I know
that it is possible to do.
-chip
On Tue, May 14, 2013 at 4:16 PM, Prakash, Sathya
<[email protected]<mailto:[email protected]>> wrote:
Just to clarify further. Are we allowed to access the memory allocated by our
UEFI driver as RuntimeServiceData in our OS drivers (the physical address is
passed by the uefi driver to controller and controller to OS driver)?
Thanks
Sathya
-----Original Message-----
From: Prakash, Sathya
[mailto:[email protected]<mailto:[email protected]>]
Sent: Tuesday, May 14, 2013 10:17 AM
To: [email protected]<mailto:[email protected]>
Subject: [edk2] Memory reserved using EfiRuntimeServicesData and IOMMU
Folks,
We allocate some host memory as EfiRuntimeServicesData and utilize the memory
in host driver for a certain purpose. This works fine with normal cases, but
will it work with IOMMU?. I see the IOMMU module in linux needs to know about
the reserved regions through RMRR address table to map the access, does the
GetMemoryMap supports this?
Thanks
Sathya
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security visibility with the essential security capabilities. Easily and
efficiently configure, manage, and operate all of your security controls
from a single console and one unified framework. Download a free trial.
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