1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> 4 ; This program and the accompanying materials 5 ; are licensed and made available under the terms and conditions of the BSD License 6 ; which accompanies this distribution. The full text of the license may be found at 7 ; http://opensource.org/licenses/bsd-license.php. 8 ; 9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 ; 12 ; Module Name: 13 ; 14 ; EnablePaging64.Asm 15 ; 16 ; Abstract: 17 ; 18 ; AsmEnablePaging64 function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 .686p 25 .model flat,C 26 .code 27 28 ;------------------------------------------------------------------------------ 29 ; VOID 30 ; EFIAPI 31 ; InternalX86EnablePaging64 ( 32 ; IN UINT16 Cs, 33 ; IN UINT64 EntryPoint, 34 ; IN UINT64 Context1, OPTIONAL 35 ; IN UINT64 Context2, OPTIONAL 36 ; IN UINT64 NewStack 37 ; ); 38 ;------------------------------------------------------------------------------ 39 InternalX86EnablePaging64 PROC 40 cli 41 mov [esp], @F ; offset for far retf, seg is the 1st arg 42 mov eax, cr4 43 or al, (1 SHL 5) 44 mov cr4, eax ; enable PAE 45 mov ecx, 0c0000080h 46 rdmsr 47 or ah, 1 ; set LME 48 wrmsr 49 mov eax, cr0 50 bts eax, 31 ; set PG 51 mov cr0, eax ; enable paging 52 retf ; topmost 2 dwords hold the address 53 @@: ; long mode starts here 54 DB 67h, 48h ; 32-bit address size, 64-bit operand size 55 mov ebx, [esp] ; mov rbx, [esp] 56 DB 67h, 48h 57 mov ecx, [esp + 8] ; mov rcx, [esp + 8] 58 DB 67h, 48h 59 mov edx, [esp + 10h] ; mov rdx, [esp + 10h] 60 DB 67h, 48h 61 mov esp, [esp + 18h] ; mov rsp, [esp + 18h] 62 DB 48h 63 add esp, -20h ; add rsp, -20h 64 call ebx ; call rbx 65 hlt ; no one should get here 66 InternalX86EnablePaging64 ENDP 67 68 END 69
