1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
| ;------------------------------------------------------------------------------
| ;
| ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
| ; SPDX-License-Identifier: BSD-2-Clause-Patent
| ;
| ; Module Name:
| ;
| ; EnablePaging64.Asm
| ;
| ; Abstract:
| ;
| ; AsmEnablePaging64 function
| ;
| ; Notes:
| ;
| ;------------------------------------------------------------------------------
|
| SECTION .text
|
| ;------------------------------------------------------------------------------
| ; VOID
| ; EFIAPI
| ; InternalX86EnablePaging64 (
| ; IN UINT16 Cs,
| ; IN UINT64 EntryPoint,
| ; IN UINT64 Context1, OPTIONAL
| ; IN UINT64 Context2, OPTIONAL
| ; IN UINT64 NewStack
| ; );
| ;------------------------------------------------------------------------------
| global ASM_PFX(InternalX86EnablePaging64)
| ASM_PFX(InternalX86EnablePaging64):
| cli
| mov DWORD [esp], .0 ; offset for far retf, seg is the 1st arg
| mov eax, cr4
| or al, (1 << 5)
| mov cr4, eax ; enable PAE
| mov ecx, 0xc0000080
| rdmsr
| or ah, 1 ; set LME
| wrmsr
| mov eax, cr0
| bts eax, 31 ; set PG
| mov cr0, eax ; enable paging
| retf ; topmost 2 dwords hold the address
| .0:
| DB 0x67, 0x48 ; 32-bit address size, 64-bit operand size
| mov ebx, [esp] ; mov rbx, [esp]
| DB 0x67, 0x48
| mov ecx, [esp + 8] ; mov rcx, [esp + 8]
| DB 0x67, 0x48
| mov edx, [esp + 0x10] ; mov rdx, [esp + 10h]
| DB 0x67, 0x48
| mov esp, [esp + 0x18] ; mov rsp, [esp + 18h]
| DB 0x48
| add esp, -0x20 ; add rsp, -20h
| call ebx ; call rbx
| hlt ; no one should get here
|
|
|
