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:       5080 bytes. <----
>   temporary memory heap used for HobList: 8080 bytes.
>   temporary memory heap occupied by memory pages: 0 bytes.

* S3 resume (no SMM / PEI decompression)

> Temp Stack : BaseAddress=0x814000 Length=0x4000
> Temp Heap  : BaseAddress=0x810000 Length=0x4000
> Total temporary memory:    32768 bytes.
>   temporary memory stack ever used:       5048 bytes. <----
>   temporary memory heap used for HobList: 7112 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 stosq", 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>
Cc: Ruiyu Ni <ruiyu.ni@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>
---
 OvmfPkg/Sec/X64/SecEntry.nasm | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/OvmfPkg/Sec/X64/SecEntry.nasm b/OvmfPkg/Sec/X64/SecEntry.nasm
index f40427aa8e04..686008f41e15 100644
--- a/OvmfPkg/Sec/X64/SecEntry.nasm
+++ b/OvmfPkg/Sec/X64/SecEntry.nasm
@@ -30,6 +30,7 @@ extern ASM_PFX(SecCoreStartupWithStack)
 ; @param[in]  RAX   Initial value of the EAX register (BIST: Built-in Self Test)
 ; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor
 ; @param[in]  RBP   Pointer to the start of the Boot Firmware Volume
+; @param[in]  ES    Set to LINEAR_SEL in TransitionFromReal16To32BitFlat
 ;
 ; @return     None  This routine does not return
 ;
@@ -44,6 +45,20 @@ ASM_PFX(_ModuleEntryPoint):
     mov     rsp, SEC_TOP_OF_STACK
     nop
 
+    ;
+    ; Fill the temporary RAM with the initial stack value.
+    ; The loop below will seed the heap as well, but that's harmless.
+    ;
+    mov     rax, FixedPcdGet32 (PcdInitValueInTempStack)  ; dword to store
+    shl     rax, 32
+    or      rax, FixedPcdGet32 (PcdInitValueInTempStack)  ; qword to store
+    mov     rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) ; base address,
+                                                          ;   relative to ES
+    mov     rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) ; byte count
+    shr     rcx, 3                                        ; qword count
+    cld                                                   ; store from base up
+    rep stosq
+
     ;
     ; Setup parameters and call SecCoreStartupWithStack
     ;   rcx: BootFirmwareVolumePtr
-- 
2.14.1.3.gb7cf6e02401b


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