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 SECTION .text 25 26 ;------------------------------------------------------------------------------ 27 ; VOID 28 ; EFIAPI 29 ; InternalX86EnablePaging64 ( 30 ; IN UINT16 Cs, 31 ; IN UINT64 EntryPoint, 32 ; IN UINT64 Context1, OPTIONAL 33 ; IN UINT64 Context2, OPTIONAL 34 ; IN UINT64 NewStack 35 ; ); 36 ;------------------------------------------------------------------------------ 37 global ASM_PFX(InternalX86EnablePaging64) 38 ASM_PFX(InternalX86EnablePaging64): 39 cli 40 mov DWORD [esp], .0 ; offset for far retf, seg is the 1st arg 41 mov eax, cr4 42 or al, (1 << 5) 43 mov cr4, eax ; enable PAE 44 mov ecx, 0xc0000080 45 rdmsr 46 or ah, 1 ; set LME 47 wrmsr 48 mov eax, cr0 49 bts eax, 31 ; set PG 50 mov cr0, eax ; enable paging 51 retf ; topmost 2 dwords hold the address 52 .0: 53 DB 0x67, 0x48 ; 32-bit address size, 64-bit operand size 54 mov ebx, [esp] ; mov rbx, [esp] 55 DB 0x67, 0x48 56 mov ecx, [esp + 8] ; mov rcx, [esp + 8] 57 DB 0x67, 0x48 58 mov edx, [esp + 0x10] ; mov rdx, [esp + 10h] 59 DB 0x67, 0x48 60 mov esp, [esp + 0x18] ; mov rsp, [esp + 18h] 61 DB 0x48 62 add esp, -0x20 ; add rsp, -20h 63 call ebx ; call rbx 64 hlt ; no one should get here 65 66
