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2c71f739 JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r | |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
2c71f739 JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; EnablePaging64.Asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; AsmEnablePaging64 function\r | |
13 | ;\r | |
14 | ; Notes:\r | |
15 | ;\r | |
16 | ;------------------------------------------------------------------------------\r | |
17 | \r | |
18 | SECTION .text\r | |
19 | \r | |
20 | ;------------------------------------------------------------------------------\r | |
21 | ; VOID\r | |
22 | ; EFIAPI\r | |
23 | ; InternalX86EnablePaging64 (\r | |
24 | ; IN UINT16 Cs,\r | |
25 | ; IN UINT64 EntryPoint,\r | |
26 | ; IN UINT64 Context1, OPTIONAL\r | |
27 | ; IN UINT64 Context2, OPTIONAL\r | |
28 | ; IN UINT64 NewStack\r | |
29 | ; );\r | |
30 | ;------------------------------------------------------------------------------\r | |
31 | global ASM_PFX(InternalX86EnablePaging64)\r | |
32 | ASM_PFX(InternalX86EnablePaging64):\r | |
33 | cli\r | |
34 | mov DWORD [esp], .0 ; offset for far retf, seg is the 1st arg\r | |
35 | mov eax, cr4\r | |
36 | or al, (1 << 5)\r | |
37 | mov cr4, eax ; enable PAE\r | |
38 | mov ecx, 0xc0000080\r | |
39 | rdmsr\r | |
40 | or ah, 1 ; set LME\r | |
41 | wrmsr\r | |
42 | mov eax, cr0\r | |
43 | bts eax, 31 ; set PG\r | |
44 | mov cr0, eax ; enable paging\r | |
45 | retf ; topmost 2 dwords hold the address\r | |
46 | .0:\r | |
47 | DB 0x67, 0x48 ; 32-bit address size, 64-bit operand size\r | |
48 | mov ebx, [esp] ; mov rbx, [esp]\r | |
49 | DB 0x67, 0x48\r | |
50 | mov ecx, [esp + 8] ; mov rcx, [esp + 8]\r | |
51 | DB 0x67, 0x48\r | |
52 | mov edx, [esp + 0x10] ; mov rdx, [esp + 10h]\r | |
53 | DB 0x67, 0x48\r | |
54 | mov esp, [esp + 0x18] ; mov rsp, [esp + 18h]\r | |
55 | DB 0x48\r | |
56 | add esp, -0x20 ; add rsp, -20h\r | |
57 | call ebx ; call rbx\r | |
58 | hlt ; no one should get here\r | |
59 | \r |