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878ddf1f | 1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006, Intel Corporation\r | |
4 | ; All rights reserved. This program and the accompanying materials\r | |
5 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
6 | ; which accompanies this distribution. The full text of the license may be found at\r | |
7 | ; http://opensource.org/licenses/bsd-license.php\r | |
8 | ;\r | |
9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | ;\r | |
12 | ; Module Name:\r | |
13 | ;\r | |
14 | ; DisablePaging64.Asm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; AsmDisablePaging64 function\r | |
19 | ;\r | |
20 | ; Notes:\r | |
21 | ;\r | |
22 | ;------------------------------------------------------------------------------\r | |
23 | \r | |
24 | .code\r | |
25 | \r | |
3f566587 | 26 | ;------------------------------------------------------------------------------\r |
27 | ; VOID\r | |
28 | ; EFIAPI\r | |
29 | ; InternalX86DisablePaging64 (\r | |
30 | ; IN UINT16 Cs,\r | |
31 | ; IN UINT32 EntryPoint,\r | |
32 | ; IN UINT32 Context1, OPTIONAL\r | |
33 | ; IN UINT32 Context2, OPTIONAL\r | |
34 | ; IN UINT32 NewStack\r | |
35 | ; );\r | |
36 | ;------------------------------------------------------------------------------\r | |
878ddf1f | 37 | InternalX86DisablePaging64 PROC\r |
38 | cli\r | |
a9a812a0 | 39 | shl rcx, 32 ; rcx[32..47] <- Cs\r |
d9da5f59 | 40 | lea eax, @F\r |
878ddf1f | 41 | mov esi, r8d\r |
a9a812a0 | 42 | or rcx, rax ; rcx[0..47] <- Cs:@F\r |
878ddf1f | 43 | mov edi, r9d\r |
a9a812a0 | 44 | mov eax, [rsp + 28h] ; eax <- New Stack\r |
45 | push rcx\r | |
46 | retf ; switch to compatibility mode\r | |
878ddf1f | 47 | @@:\r |
48 | mov esp, eax ; set up new stack\r | |
49 | mov rax, cr0\r | |
50 | btr eax, 31\r | |
51 | mov cr0, rax ; disable paging\r | |
52 | mov ecx, 0c0000080h\r | |
53 | rdmsr\r | |
54 | and ah, NOT 1 ; clear LME\r | |
55 | wrmsr\r | |
56 | mov rax, cr4\r | |
57 | and al, NOT (1 SHL 5) ; clear PAE\r | |
58 | mov cr4, rax\r | |
a9a812a0 | 59 | push rdi ; push Context2\r |
60 | push rsi ; push Context1\r | |
61 | call rdx ; transfer control to EntryPoint\r | |
62 | hlt ; no one should get here\r | |
878ddf1f | 63 | InternalX86DisablePaging64 ENDP\r |
64 | \r | |
65 | END\r |