This allows the PEI core to report the maximum temporary SEC/PEI stack
usage on the DEBUG_INFO level, in the PeiCheckAndSwitchStack() function
[MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c]:
* Normal boot:
> Temp Stack : BaseAddress=0x814000 Length=0x4000
> Temp Heap : BaseAddress=0x810000 Length=0x4000
> Total temporary memory: 32768 bytes.
> temporary memory stack ever used: 3664 bytes. <----
> temporary memory heap used for HobList: 5904 bytes.
> temporary memory heap occupied by memory pages: 0 bytes.
* S3 resume (with PEI decompression / SMM):
> Temp Stack : BaseAddress=0x814000 Length=0x4000
> Temp Heap : BaseAddress=0x810000 Length=0x4000
> Total temporary memory: 32768 bytes.
> temporary memory stack ever used: 3428 bytes. <----
> temporary memory heap used for HobList: 4816 bytes.
> temporary memory heap occupied by memory pages: 0 bytes.
I unit-tested this change by transitorily adding an infinite loop right
after the "rep stosd", and dumping the guest's temp SEC/PEI RAM (32KB
currently) while the guest was stuck in the loop. The dump includes one
dword from before and after the temp SEC/PEI RAM:
> $ virsh qemu-monitor-command GUEST_NAME --hmp 'xp /8194wx 0x80FFFC'
>
>
000000000080fffc: 0x00000000 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5
>
000000000081000c: 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5
> ...
>
0000000000817fec: 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5 0x5aa55aa5
>
0000000000817ffc: 0x5aa55aa5 0x00000000
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=747
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
; @param[in] EAX Initial value of the EAX register (BIST: Built-in Self Test)\r
; @param[in] DI 'BP': boot-strap processor, or 'AP': application processor\r
; @param[in] EBP Pointer to the start of the Boot Firmware Volume\r
+; @param[in] DS Selector allowing flat access to all addresses\r
+; @param[in] ES Selector allowing flat access to all addresses\r
+; @param[in] FS Selector allowing flat access to all addresses\r
+; @param[in] GS Selector allowing flat access to all addresses\r
+; @param[in] SS Selector allowing flat access to all addresses\r
;\r
; @return None This routine does not return\r
;\r
global ASM_PFX(_ModuleEntryPoint)\r
ASM_PFX(_ModuleEntryPoint):\r
\r
+ ;\r
+ ; Fill the temporary RAM with the initial stack value.\r
+ ; The loop below will seed the heap as well, but that's harmless.\r
+ ;\r
+ mov eax, FixedPcdGet32 (PcdInitValueInTempStack) ; dword to store\r
+ mov edi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) ; base address,\r
+ ; relative to\r
+ ; ES\r
+ mov ecx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 4 ; dword count\r
+ cld ; store from base\r
+ ; up\r
+ rep stosd\r
+\r
;\r
; Load temporary RAM stack based on PCDs\r
;\r
gEfiMdePkgTokenSpaceGuid.PcdGuidedExtractHandlerTableAddress\r
gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize\r
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd\r
+ gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack\r
\r
[FeaturePcd]\r
gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire\r