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23086ba8 | 1 | /** @file\r |
2 | AsmDisablePaging32 function.\r | |
3 | \r | |
4 | Copyright (c) 2006, Intel Corporation<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #if _MSC_EXTENSIONS\r | |
16 | \r | |
17 | __declspec (naked)\r | |
18 | VOID\r | |
19 | EFIAPI\r | |
20 | InternalX86DisablePaging32 (\r | |
21 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
22 | IN VOID *Context1, OPTIONAL\r | |
23 | IN VOID *Context2, OPTIONAL\r | |
24 | IN VOID *NewStack\r | |
25 | )\r | |
26 | {\r | |
27 | _asm {\r | |
28 | push ebp\r | |
29 | mov ebp, esp\r | |
30 | mov ebx, EntryPoint\r | |
31 | mov ecx, Context1\r | |
32 | mov edx, Context2\r | |
33 | pushfd\r | |
34 | pop edi // save EFLAGS to edi\r | |
35 | cli\r | |
36 | mov eax, cr0\r | |
37 | btr eax, 31\r | |
38 | mov esp, NewStack\r | |
39 | mov cr0, eax\r | |
40 | push edi\r | |
41 | popfd // restore EFLAGS from edi\r | |
42 | push edx\r | |
43 | push ecx\r | |
44 | call ebx\r | |
45 | jmp $ // EntryPoint() should not return\r | |
46 | }\r | |
47 | }\r | |
48 | \r | |
49 | #endif\r |