OvmfPkg/Sec/X64: seed the temporary RAM with PcdInitValueInTempStack

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>
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>

diff --git a/OvmfPkg/Sec/X64/SecEntry.nasm b/OvmfPkg/Sec/X64/SecEntry.nasm
index f40427aa8e04f0c896f6b2826c4ae36f9c48c01c..7c55032ac9625e50d0951422edaf3934fb5981a0 100644 (file)
--- a/OvmfPkg/Sec/X64/SecEntry.nasm
+++ b/OvmfPkg/Sec/X64/SecEntry.nasm
@@ -30,12 +30,33 @@ extern ASM_PFX(SecCoreStartupWithStack)
 ; @param[in]  RAX   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]  RBP   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     rax, (FixedPcdGet32 (                        \\r
+                    PcdInitValueInTempStack              \\r
+                    ) << 32) |                           \\r
+                 FixedPcdGet32 (PcdInitValueInTempStack)      ; qword to store\r
+    mov     rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)     ; base address,\r
+                                                              ;   relative to\r
+                                                              ;   ES\r
+    mov     rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count\r
+    cld                                                       ; store from base\r
+                                                              ;   up\r
+    rep stosq\r
+\r
     ;\r
     ; Load temporary RAM stack based on PCDs\r
     ;\r