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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 | ; 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 |
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37 | InternalX86DisablePaging64 PROC\r |
| 38 | cli\r |
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39 | shl rcx, 32 ; rcx[32..47] <- Cs\r |
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40 | lea eax, @F\r |
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41 | mov esi, r8d\r |
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42 | or rcx, rax ; rcx[0..47] <- Cs:@F\r |
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43 | mov edi, r9d\r |
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44 | mov eax, [rsp + 28h] ; eax <- New Stack\r |
| 45 | push rcx\r |
| 46 | retf ; switch to compatibility mode\r |
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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 |
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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 |
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63 | InternalX86DisablePaging64 ENDP\r |
| 64 | \r |
| 65 | END\r |
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