projects / mirror_edk2.git / blame
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|---|---|---|
| 2c7e5c2f HT |
1 | ; Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>\r |
| 2 | ; This program and the accompanying materials \r | |
| 3eb9473e | 3 | ; are licensed and made available under the terms and conditions of the BSD License \r |
| 4 | ; which accompanies this distribution. The full text of the license may be found at \r | |
| 5 | ; http://opensource.org/licenses/bsd-license.php \r | |
| 6 | ; \r | |
| 7 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 8 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
| 9 | ;\r | |
| 10 | ; Module Name:\r | |
| 11 | ;\r | |
| 12 | ; EnablePaging64.Asm\r | |
| 13 | ;\r | |
| 14 | ; Abstract:\r | |
| 15 | ;\r | |
| 16 | ; AsmEnablePaging64 function\r | |
| 17 | ;\r | |
| 18 | ; Notes:\r | |
| 19 | ;\r | |
| 20 | ;------------------------------------------------------------------------------\r | |
| 21 | \r | |
| 22 | .686p\r | |
| 23 | .model flat,C\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 | mov [esp], @F ; offset for far retf, seg is the 1st arg\r | |
| 40 | mov eax, cr4\r | |
| 41 | or al, (1 SHL 5)\r | |
| 42 | mov cr4, eax ; enable PAE\r | |
| 43 | mov ecx, 0c0000080h\r | |
| 44 | rdmsr\r | |
| 45 | or ah, 1 ; set LME\r | |
| 46 | wrmsr\r | |
| 47 | mov eax, cr0\r | |
| 48 | bts eax, 31 ; set PG\r | |
| 49 | mov cr0, eax ; enable paging\r | |
| 50 | retf ; topmost 2 dwords hold the address\r | |
| 51 | @@: ; long mode starts here\r | |
| 52 | DB 67h, 48h ; 32-bit address size, 64-bit operand size\r | |
| 53 | mov ebx, [esp] ; mov rbx, [esp]\r | |
| 54 | DB 67h, 48h\r | |
| 55 | mov ecx, [esp + 8] ; mov rcx, [esp + 8]\r | |
| 56 | DB 67h, 48h\r | |
| 57 | mov edx, [esp + 10h] ; mov rdx, [esp + 10h]\r | |
| 58 | DB 67h, 48h\r | |
| 59 | mov esp, [esp + 18h] ; mov rsp, [esp + 18h]\r | |
| 60 | DB 48h\r | |
| 61 | add esp, -20h ; add rsp, -20h\r | |
| 62 | call ebx ; call rbx\r | |
| 63 | hlt ; no one should get here\r | |
| 64 | InternalX86EnablePaging64 ENDP\r | |
| 65 | \r | |
| 66 | END\r |