| ;------------------------------------------------------------------------------ | |
| ; @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 | |