Thanks for your suggestion. I will take a look. I've one last question: I've seen that the Nt32Pkg permits to have EDKII as a Windows application. Does Nt32Pkg supports SMM? If that so, it might be possible to debug SMM that way?
Best regards, Thomas 2014-03-26 17:29 GMT+01:00 Andrew Fish <af...@apple.com>: > > On Mar 26, 2014, at 1:03 AM, Lethom Legrand <cendr...@gmail.com> wrote: > > Thank you for your answer! > > I was afraid it would be some thing like this. > > Easy to anticipate my next question, but I will ask anyway: how can I > debug SMM code? I heard about DuetPkg, that is a full emulation of UEFI, so > maybe it is a solution? > Otherwise, I think my last hope is hardware debuging through USB port 0? > > > The USB port is not a hardware debugger. It is just the serial transport > for a software debugger. > > If you have an edk2 based ROM you can use the SourceLevelDebugPkg > https://svn.code.sf.net/p/edk2/code/trunk/edk2/SourceLevelDebugPkg/ to > get a software debugger in SMM. You need to rebuild the ROM and make sure > the DebugAgentLIb for the SMM points to here: > https://svn.code.sf.net/p/edk2/code/trunk/edk2/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgentLib.inf > > Your kind of asking questions like you don't have a firmware build for > your platform. The firmware will lock down SMM, and you can only access SMM > memory from SMM mode. So there is not really a way to get code into SMM > from a 3rd party. The usually policy is to only load modules that are in > the sighed ROM into SMM, and to lock SMM prior to running any third party > code (PCI option ROMs etc.). > > Thanks, > > Andrew Fish > > Thomas > > > 2014-03-25 17:53 GMT+01:00 Jordan Justen <jljus...@gmail.com>: > >> On Tue, Mar 25, 2014 at 3:03 AM, Lethom Legrand <cendr...@gmail.com> >> wrote: >> > Hello everyone, >> > >> > I am trying to see how the things work in UEFI with the System >> Management >> > Mode (SMM) of x86(-64) CPU. >> > >> > My understanding is the following: >> > 1. When entering in SMM, the CPU sets itself in a real-like mode >> > 2. A first SMM Dispatcher handles "legacy" SMM code: it executes them, >> one >> > after the other >> > 3. This first SMM Dispatcher sets the CPU in flat protected mode >> > 4. A second SMM Dispatcher runs and executes SMM Drivers (SMM Drivers >> are >> > Runtime Drivers that loaded themselves in SMRAM) >> > 5. When every SMM Driver is executed, the RSM instruction is executed. >> > >> > I think I'm close to the truth. Unfortunately, when I'm searching in >> EDKII, >> > I cannot find anything before the 4. statement. That is, it seems that >> EDKII >> > misses the real-like mode part of SMM flow. >> > >> > So my question, actually, is simple: is it true that EDKII is not >> > "complete". By that, I mean there are missing part that have to be >> implement >> > by, for instance, hardware vendors that want to use it? I understand SMM >> > Drivers code is the most hardware specific part of UEFI, so it makes >> sense. >> > >> > (another "bonus" question: have you any idea of how I can debug SMM >> code? >> > For instance, in KVM?) >> >> Initializing SMM and handling SMM entry is usually chipset specific >> code. I don't think there is an example in EDK II. >> >> I think QEMU (without KVM) supports SMM. Unfortunately, OVMF doesn't >> support SMM so I don't think you'll be able debug SMM code with OVMF. >> >> -Jordan >> >> >> ------------------------------------------------------------------------------ >> Learn Graph Databases - Download FREE O'Reilly Book >> "Graph Databases" is the definitive new guide to graph databases and their >> applications. Written by three acclaimed leaders in the field, >> this first edition is now available. Download your free book today! >> http://p.sf.net/sfu/13534_NeoTech >> _______________________________________________ >> edk2-devel mailing list >> edk2-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/edk2-devel >> > > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > > http://p.sf.net/sfu/13534_NeoTech_______________________________________________ > edk2-devel mailing list > edk2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/edk2-devel > > > > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > http://p.sf.net/sfu/13534_NeoTech > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/edk2-devel > >
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