Hi, Jeff:
Thanks for your quick reply!
Another question:
1. MdeModulePkg\Core\DxeIplPeim\Ia32\DxeLoadFunc.c will reconstruct IDT before
handing off to DXE.
if (FeaturePcdGet(PcdDxeIplSwitchToLongMode))
{
Why it need to reconstruct IDT when trying to switch to Long-mode?
}
Else
{
Why does it not need to reconstruct IDT in this case?
}
Best wishes,
----- Original Message -----
From: Fan, Jeff [mailto:[email protected]]
Sent: 2014年10月27日 14:33
To: [email protected]
Subject: Re: [edk2] question about setuping IDT in UEFI boot procedure
Exaclty.
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Monday, October 27, 2014 2:17 PM
To: [email protected]
Subject: Re: [edk2] question about setuping IDT in UEFI boot procedure
Hi, Jeff:
Thanks for your reply!
S3ResumeExecuteBootScript() (in
UefiCpuPkg\Universal\Acpi\S3Resume2Pei\S3Resume.c) will call AsmReadIdtr
(&PeiS3ResumeState->Idtr) to save IDT.
And S3ResumeBootOs()(in UefiCpuPkg\Universal\Acpi\S3Resume2Pei\S3Resume.c)
will call AsmWriteIdtr (&PeiS3ResumeState->Idtr) to restore IDT.
Why need to save and restore IDT in S3Resume PEIM?
Because of BootScriptExecutorDxe driver will call SetIdtEntry() to change IDT?
Best wishes,
----- Original Message -----
From: Fan, Jeff [mailto:[email protected]]
Sent: 2014年10月24日 16:48
To: [email protected]
Subject: Re: [edk2] question about setuping IDT in UEFI boot procedure
On S3 path, S3NvsPageTableAddress () (in UefiCpuPkg/Universal/Acpi/S3Resume.c)
will re-create Page Table since we cannot trust the original Page Table saved
in ACPINvs memory more.
Moreover, we only create page table for < 4G address is due to performance
concern.
When programming boot script entries, we may access > 4 G MMIO or memory
address. Thus, One Page Fault exception handler is required to build Page
entry in case > 4G address accessed.
Jeff
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, October 23, 2014 5:55 PM
To: [email protected]
Subject: Re: [edk2] question about setuping IDT in UEFI boot procedure
Hi, Jeff:
MdeModulePkg\Universal\Acpi\BootScriptExecutorDxe\X64\SetIdtEntry.c will hook
page fault handler.
So, is there any story about adding this hook function?
I want to understand why adding this code.
Thanks a lot!
Best wishes,
------------------------------------------------------------------------------
_______________________________________________
edk2-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
_______________________________________________
edk2-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
_______________________________________________
edk2-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
_______________________________________________
edk2-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
_______________________________________________
edk2-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/edk2-devel
