projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 2c71f739 JJ |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r | |
| 9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 2c71f739 JJ |
5 | ;\r |
| 6 | ; Module Name:\r | |
| 7 | ;\r | |
| 8 | ; EnablePaging64.Asm\r | |
| 9 | ;\r | |
| 10 | ; Abstract:\r | |
| 11 | ;\r | |
| 12 | ; AsmEnablePaging64 function\r | |
| 13 | ;\r | |
| 14 | ; Notes:\r | |
| 15 | ;\r | |
| 16 | ;------------------------------------------------------------------------------\r | |
| 17 | \r | |
| 18 | SECTION .text\r | |
| 19 | \r | |
| 20 | ;------------------------------------------------------------------------------\r | |
| 21 | ; VOID\r | |
| 22 | ; EFIAPI\r | |
| 23 | ; InternalX86EnablePaging64 (\r | |
| 24 | ; IN UINT16 Cs,\r | |
| 25 | ; IN UINT64 EntryPoint,\r | |
| 26 | ; IN UINT64 Context1, OPTIONAL\r | |
| 27 | ; IN UINT64 Context2, OPTIONAL\r | |
| 28 | ; IN UINT64 NewStack\r | |
| 29 | ; );\r | |
| 30 | ;------------------------------------------------------------------------------\r | |
| 31 | global ASM_PFX(InternalX86EnablePaging64)\r | |
| 32 | ASM_PFX(InternalX86EnablePaging64):\r | |
| 33 | cli\r | |
| 34 | mov DWORD [esp], .0 ; offset for far retf, seg is the 1st arg\r | |
| 35 | mov eax, cr4\r | |
| 36 | or al, (1 << 5)\r | |
| 37 | mov cr4, eax ; enable PAE\r | |
| 38 | mov ecx, 0xc0000080\r | |
| 39 | rdmsr\r | |
| 40 | or ah, 1 ; set LME\r | |
| 41 | wrmsr\r | |
| 42 | mov eax, cr0\r | |
| 43 | bts eax, 31 ; set PG\r | |
| 44 | mov cr0, eax ; enable paging\r | |
| 45 | retf ; topmost 2 dwords hold the address\r | |
| 46 | .0:\r | |
| 47 | DB 0x67, 0x48 ; 32-bit address size, 64-bit operand size\r | |
| 48 | mov ebx, [esp] ; mov rbx, [esp]\r | |
| 49 | DB 0x67, 0x48\r | |
| 50 | mov ecx, [esp + 8] ; mov rcx, [esp + 8]\r | |
| 51 | DB 0x67, 0x48\r | |
| 52 | mov edx, [esp + 0x10] ; mov rdx, [esp + 10h]\r | |
| 53 | DB 0x67, 0x48\r | |
| 54 | mov esp, [esp + 0x18] ; mov rsp, [esp + 18h]\r | |
| 55 | DB 0x48\r | |
| 56 | add esp, -0x20 ; add rsp, -20h\r | |
| 57 | call ebx ; call rbx\r | |
| 58 | hlt ; no one should get here\r | |
| 59 | \r |