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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>
| ; Copyright (c) 2019, Citrix Systems, Inc.
| ;
| ; SPDX-License-Identifier: BSD-2-Clause-Patent
| ;
| ;------------------------------------------------------------------------------
|
| BITS 32
|
| ;
| ; Modified: EAX, EBX, ECX, EDX, ESP
| ;
| 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
|
| ;
| ; backup ESP
| ;
| mov ebx, esp
|
| ;
| ; recalculate delta
| ;
| mov esp, PVH_SPACE(16)
| call .delta
| .delta:
| pop edx
| sub edx, ADDR_OF(.delta)
|
| ;
| ; push return addr and seg to the stack, then return far
| ;
| push dword LINEAR_CODE64_SEL
| mov eax, ADDR_OF(jumpTo64BitAndLandHere)
| add eax, edx ; add delta
| push eax
| retf
|
| BITS 64
| jumpTo64BitAndLandHere:
|
| ;
| ; restore ESP
| ;
| mov esp, ebx
|
| debugShowPostCode POSTCODE_64BIT_MODE
|
| OneTimeCallRet Transition32FlatTo64Flat
|
|
|
