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