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1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r |
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3 | ; Copyright (c) 2006 - 2008, Intel Corporation\r |
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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 | ; EnablePaging64.Asm\r |
| 15 | ;\r |
| 16 | ; Abstract:\r |
| 17 | ;\r |
| 18 | ; AsmEnablePaging64 function\r |
| 19 | ;\r |
| 20 | ; Notes:\r |
| 21 | ;\r |
| 22 | ;------------------------------------------------------------------------------\r |
| 23 | \r |
| 24 | .code\r |
| 25 | \r |
| 26 | ;------------------------------------------------------------------------------\r |
| 27 | ; VOID\r |
| 28 | ; EFIAPI\r |
| 29 | ; InternalX86EnablePaging64 (\r |
| 30 | ; IN UINT16 Cs,\r |
| 31 | ; IN UINT64 EntryPoint,\r |
| 32 | ; IN UINT64 Context1, OPTIONAL\r |
| 33 | ; IN UINT64 Context2, OPTIONAL\r |
| 34 | ; IN UINT64 NewStack\r |
| 35 | ; );\r |
| 36 | ;------------------------------------------------------------------------------\r |
| 37 | InternalX86EnablePaging64 PROC\r |
| 38 | cli\r |
| 39 | pop rax ; skip the return address\r |
| 40 | call @Base\r |
| 41 | @Base:\r |
| 42 | add dword ptr [rsp], @F - @Base ; offset for far retf, seg is the 1st arg\r |
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43 | mov rax, cr4\r |
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44 | or al, (1 SHL 5)\r |
| 45 | mov cr4, rax ; enable PAE\r |
| 46 | mov ecx, 0c0000080h\r |
| 47 | rdmsr\r |
| 48 | or ah, 1 ; set LME\r |
| 49 | wrmsr\r |
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50 | mov rax, cr0\r |
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51 | bts eax, 31\r |
| 52 | mov cr0, rax ; enable paging\r |
| 53 | retf\r |
| 54 | @@: ; long mode starts here\r |
| 55 | mov rbx, [esp]\r |
| 56 | mov rcx, [esp + 8]\r |
| 57 | mov rdx, [esp + 10h]\r |
| 58 | mov rsp, [esp + 18h]\r |
| 59 | add rsp, -20h\r |
| 60 | call rbx\r |
| 61 | hlt ; halt processor if EntryPoint() returned\r |
| 62 | InternalX86EnablePaging64 ENDP\r |
| 63 | \r |
| 64 | END\r |
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