diff options
Diffstat (limited to 'OvmfPkg/Sec/Ia32/SecEntry.nasm')
| -rw-r--r-- | OvmfPkg/Sec/Ia32/SecEntry.nasm | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/OvmfPkg/Sec/Ia32/SecEntry.nasm b/OvmfPkg/Sec/Ia32/SecEntry.nasm index 7fee1c2b2e..03501969eb 100644 --- a/OvmfPkg/Sec/Ia32/SecEntry.nasm +++ b/OvmfPkg/Sec/Ia32/SecEntry.nasm @@ -29,6 +29,11 @@ extern ASM_PFX(SecCoreStartupWithStack) ; @param[in] EAX Initial value of the EAX register (BIST: Built-in Self Test)
; @param[in] DI 'BP': boot-strap processor, or 'AP': application processor
; @param[in] EBP Pointer to the start of the Boot Firmware Volume
+; @param[in] DS Selector allowing flat access to all addresses
+; @param[in] ES Selector allowing flat access to all addresses
+; @param[in] FS Selector allowing flat access to all addresses
+; @param[in] GS Selector allowing flat access to all addresses
+; @param[in] SS Selector allowing flat access to all addresses
;
; @return None This routine does not return
;
@@ -36,6 +41,19 @@ global ASM_PFX(_ModuleEntryPoint) ASM_PFX(_ModuleEntryPoint):
;
+ ; Fill the temporary RAM with the initial stack value.
+ ; The loop below will seed the heap as well, but that's harmless.
+ ;
+ mov eax, FixedPcdGet32 (PcdInitValueInTempStack) ; dword to store
+ mov edi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) ; base address,
+ ; relative to
+ ; ES
+ mov ecx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 4 ; dword count
+ cld ; store from base
+ ; up
+ rep stosd
+
+ ;
; Load temporary RAM stack based on PCDs
;
%define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \
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