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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 | ; DisablePaging32.Asm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; AsmDisablePaging32 function\r | |
19 | ;\r | |
20 | ; Notes:\r | |
21 | ;\r | |
22 | ;------------------------------------------------------------------------------\r | |
23 | \r | |
24 | .386\r | |
25 | .model flat,C\r | |
26 | .code\r | |
27 | \r | |
28 | ;------------------------------------------------------------------------------\r | |
29 | ; VOID\r | |
30 | ; EFIAPI\r | |
31 | ; InternalX86DisablePaging32 (\r | |
32 | ; IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
33 | ; IN VOID *Context1, OPTIONAL\r | |
34 | ; IN VOID *Context2, OPTIONAL\r | |
35 | ; IN VOID *NewStack\r | |
36 | ; );\r | |
37 | ;------------------------------------------------------------------------------\r | |
38 | InternalX86DisablePaging32 PROC\r | |
39 | mov ebx, [esp + 4]\r | |
40 | mov ecx, [esp + 8]\r | |
41 | mov edx, [esp + 12]\r | |
42 | pushfd\r | |
43 | pop edi ; save EFLAGS to edi\r | |
44 | cli\r | |
45 | mov eax, cr0\r | |
46 | btr eax, 31\r | |
47 | mov esp, [esp + 16]\r | |
48 | mov cr0, eax\r | |
49 | push edi\r | |
50 | popfd ; restore EFLAGS from edi\r | |
51 | push edx\r | |
52 | push ecx\r | |
53 | call ebx\r | |
54 | jmp $ ; EntryPoint() should not return\r | |
55 | InternalX86DisablePaging32 ENDP\r | |
56 | \r | |
57 | END\r |