| ;------------------------------------------------------------------------------ | |
| ; | |
| ; 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: | |
| ; | |
| ;------------------------------------------------------------------------------ | |
| .code | |
| ;------------------------------------------------------------------------------ | |
| ; VOID | |
| ; EFIAPI | |
| ; InternalX86EnablePaging64 ( | |
| ; IN UINT16 Cs, | |
| ; IN UINT64 EntryPoint, | |
| ; IN UINT64 Context1, OPTIONAL | |
| ; IN UINT64 Context2, OPTIONAL | |
| ; IN UINT64 NewStack | |
| ; ); | |
| ;------------------------------------------------------------------------------ | |
| InternalX86EnablePaging64 PROC | |
| cli | |
| pop rax ; skip the return address | |
| call @Base | |
| @Base: | |
| add dword ptr [rsp], @F - @Base ; offset for far retf, seg is the 1st arg | |
| mov rax, cr4 ; mov eax, cr4 | |
| or al, (1 SHL 5) | |
| mov cr4, rax ; enable PAE | |
| mov ecx, 0c0000080h | |
| rdmsr | |
| or ah, 1 ; set LME | |
| wrmsr | |
| mov rax, cr0 ; mov eax, cr0 | |
| bts eax, 31 | |
| mov cr0, rax ; enable paging | |
| retf | |
| @@: ; long mode starts here | |
| mov rbx, [esp] | |
| mov rcx, [esp + 8] | |
| mov rdx, [esp + 10h] | |
| mov rsp, [esp + 18h] | |
| add rsp, -20h | |
| call rbx | |
| hlt ; halt processor if EntryPoint() returned | |
| InternalX86EnablePaging64 ENDP | |
| END |