;------------------------------------------------------------------------------ ; ; Copyright (c) 2006, Intel Corporation. All rights reserved.
; This program and the accompanying materials ; are licensed and made available under the terms and conditions of the BSD License ; which accompanies this distribution. The full text of the license may be found at ; http://opensource.org/licenses/bsd-license.php. ; ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. ; ; Module Name: ; ; EnablePaging64.Asm ; ; Abstract: ; ; AsmEnablePaging64 function ; ; Notes: ; ;------------------------------------------------------------------------------ .686p .model flat,C .code ;------------------------------------------------------------------------------ ; VOID ; EFIAPI ; InternalX86EnablePaging64 ( ; IN UINT16 Cs, ; IN UINT64 EntryPoint, ; IN UINT64 Context1, OPTIONAL ; IN UINT64 Context2, OPTIONAL ; IN UINT64 NewStack ; ); ;------------------------------------------------------------------------------ InternalX86EnablePaging64 PROC cli mov [esp], @F ; offset for far retf, seg is the 1st arg mov eax, cr4 or al, (1 SHL 5) mov cr4, eax ; enable PAE mov ecx, 0c0000080h rdmsr or ah, 1 ; set LME wrmsr mov eax, cr0 bts eax, 31 ; set PG mov cr0, eax ; enable paging retf ; topmost 2 dwords hold the address @@: ; long mode starts here DB 67h, 48h ; 32-bit address size, 64-bit operand size mov ebx, [esp] ; mov rbx, [esp] DB 67h, 48h mov ecx, [esp + 8] ; mov rcx, [esp + 8] DB 67h, 48h mov edx, [esp + 10h] ; mov rdx, [esp + 10h] DB 67h, 48h mov esp, [esp + 18h] ; mov rsp, [esp + 18h] DB 48h add esp, -20h ; add rsp, -20h call ebx ; call rbx hlt ; no one should get here InternalX86EnablePaging64 ENDP END