1 files changed, 106 insertions, 0 deletions
diff --git a/Core/UefiCpuPkg/ResetVector/Vtf0/Main.asm b/Core/UefiCpuPkg/ResetVector/Vtf0/Main.asm
new file mode 100644
index 0000000000..ebfb9015d4
--- /dev/null
+++ b/Core/UefiCpuPkg/ResetVector/Vtf0/Main.asm
@@ -0,0 +1,106 @@
+;------------------------------------------------------------------------------
+; @file
+; Main routine of the pre-SEC code up through the jump into SEC
+;
+; Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+
+BITS    16
+
+;
+; Modified:  EBX, ECX, EDX, EBP
+;
+; @param[in,out]  RAX/EAX  Initial value of the EAX register
+;                          (BIST: Built-in Self Test)
+; @param[in,out]  DI       'BP': boot-strap processor, or
+;                          'AP': application processor
+; @param[out]     RBP/EBP  Address of Boot Firmware Volume (BFV)
+;
+; @return         None  This routine jumps to SEC and does not return
+;
+Main16:
+    OneTimeCall EarlyInit16
+
+    ;
+    ; Transition the processor from 16-bit real mode to 32-bit flat mode
+    ;
+    OneTimeCall TransitionFromReal16To32BitFlat
+
+BITS    32
+
+    ;
+    ; Search for the Boot Firmware Volume (BFV)
+    ;
+    OneTimeCall Flat32SearchForBfvBase
+
+    ;
+    ; EBP - Start of BFV
+    ;
+
+    ;
+    ; Search for the SEC entry point
+    ;
+    OneTimeCall Flat32SearchForSecEntryPoint
+
+    ;
+    ; ESI - SEC Core entry point
+    ; EBP - Start of BFV
+    ;
+
+%ifdef ARCH_IA32
+
+    ;
+    ; Restore initial EAX value into the EAX register
+    ;
+    mov     eax, esp
+
+    ;
+    ; Jump to the 32-bit SEC entry point
+    ;
+    jmp     esi
+
+%else
+
+    ;
+    ; Transition the processor from 32-bit flat mode to 64-bit flat mode
+    ;
+    OneTimeCall Transition32FlatTo64Flat
+
+BITS    64
+
+    ;
+    ; Some values were calculated in 32-bit mode.  Make sure the upper
+    ; 32-bits of 64-bit registers are zero for these values.
+    ;
+    mov     rax, 0x00000000ffffffff
+    and     rsi, rax
+    and     rbp, rax
+    and     rsp, rax
+
+    ;
+    ; RSI - SEC Core entry point
+    ; RBP - Start of BFV
+    ;
+
+    ;
+    ; Restore initial EAX value into the RAX register
+    ;
+    mov     rax, rsp
+
+    ;
+    ; Jump to the 64-bit SEC entry point
+    ;
+    jmp     rsi
+
+%endif
+
+