diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/OvmfPkg/Sec/Ia32 | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/OvmfPkg/Sec/Ia32')
| -rw-r--r-- | roms/edk2/OvmfPkg/Sec/Ia32/SecEntry.nasm | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Sec/Ia32/SecEntry.nasm b/roms/edk2/OvmfPkg/Sec/Ia32/SecEntry.nasm new file mode 100644 index 000000000..6824ef1d8 --- /dev/null +++ b/roms/edk2/OvmfPkg/Sec/Ia32/SecEntry.nasm @@ -0,0 +1,68 @@ +;------------------------------------------------------------------------------
+;*
+;* Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+;* SPDX-License-Identifier: BSD-2-Clause-Patent
+;*
+;* CpuAsm.asm
+;*
+;* Abstract:
+;*
+;------------------------------------------------------------------------------
+
+#include <Base.h>
+
+ SECTION .text
+
+extern ASM_PFX(SecCoreStartupWithStack)
+
+;
+; SecCore Entry Point
+;
+; Processor is in flat protected mode
+;
+; @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
+;
+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) + \
+ FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))
+ mov eax, SEC_TOP_OF_STACK
+ mov esp, eax
+ nop
+
+ ;
+ ; Setup parameters and call SecCoreStartupWithStack
+ ; [esp] return address for call
+ ; [esp+4] BootFirmwareVolumePtr
+ ; [esp+8] TopOfCurrentStack
+ ;
+ push eax
+ push ebp
+ call ASM_PFX(SecCoreStartupWithStack)
+
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