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What is the first place of code, we enter in EDK2 after an SMI?
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Feng Libo <lbfeng@...>
There is a functionality in AMD hardware debug tools, HDT, with which you can set a breakpoint at the SMM entry point, the very first piece of code. I believe Intel's debug tools has the same functionality as well.
Best Regards Feng Libo |
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Feng Libo <lbfeng@...>
Both AMD and Intel's Architectures Software Developer's Manual have the chapter to describe how to enter the SMM.
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Yes, SMM is transparent for OS, so OS developers hate it. OS developers create SCI as equivalent. From: "Guomin Jiang" <guomin.jiang@...> Date: 2020-08-05 17:53:24 To: "discuss@edk2.groups.io" <discuss@edk2.groups.io>,"mzktsn@..." <mzktsn@...> Subject: Re: [edk2-discuss] What is the first place of code, we enter in EDK2 after an SMI?>As I know, the SMM flow as below:
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Guomin Jiang
As I know, the SMM flow as below:
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1. Hardware trigger SMM signal (by IO trap, USB, PowerButton, and so on, detail in PI Spec) 2. CPU Save context and jump to the _SmiEntryPoint(SmiEntry.nasm) 3. _SmiEntryPoint()[SmiEntry.nasm] -> SmiRendezvous()[MpService.c] ->BSPHandler()[MpService.c] ->gSmmCpuPrivate->SmmCoreEntry() == SmmEntryPoint()[PiSmmCore] --> Registered Dispatcher(IO, USB, PowerButton, etc) According to my knowledge, there are no pointer prior the SmiEntry.nasm. And it is different to hack the SMM because it is transparent for OS. -----Original Message----- |
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mzktsn@...
Hello, i would like to write code, right after an SMI occurs.
I have searched the functions such as SmiRendezvous,SmiManage etc, and finally went to UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm file. Is there any other file than this that the flow goes before reaching this file? I have also read the document about EDK2 Topology : SMM of 2016 which points that after a synchronous or asynchronous SMI the flow goeas to the SmiEntry.(n)asm file. Thanks. |
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