UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[mirror_edk2.git] / UefiCpuPkg / ResetVector / Vtf0 / Ia32 / Flat32ToFlat64.asm

;------------------------------------------------------------------------------\r
; @file\r
; Transition from 32 bit flat protected mode into 64 bit flat protected mode\r
;\r
; Copyright (c) 2008 - 2018, Intel Corporation. All rights reserved.<BR>\r
; SPDX-License-Identifier: BSD-2-Clause-Patent\r
;\r
;------------------------------------------------------------------------------\r
\r
BITS    32\r
\r
;\r
; Modified:  EAX\r
;\r
Transition32FlatTo64Flat:\r
\r
    OneTimeCall SetCr3ForPageTables64\r
\r
    mov     eax, cr4\r
    bts     eax, 5                      ; enable PAE\r
    mov     cr4, eax\r
\r
    mov     ecx, 0xc0000080\r
    rdmsr\r
    bts     eax, 8                      ; set LME\r
    wrmsr\r
\r
    mov     eax, cr0\r
    bts     eax, 31                     ; set PG\r
    mov     cr0, eax                    ; enable paging\r
\r
    jmp     LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere)\r
BITS    64\r
jumpTo64BitAndLandHere:\r
\r
    debugShowPostCode POSTCODE_64BIT_MODE\r
\r
    OneTimeCallRet Transition32FlatTo64Flat\r
\r