1 files changed, 65 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm b/Core/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm
new file mode 100644
index 0000000000..41f0ed1ce5
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm
@@ -0,0 +1,65 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; 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:
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; InternalX86EnablePaging64 (
+;   IN      UINT16                    Cs,
+;   IN      UINT64                    EntryPoint,
+;   IN      UINT64                    Context1,  OPTIONAL
+;   IN      UINT64                    Context2,  OPTIONAL
+;   IN      UINT64                    NewStack
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalX86EnablePaging64)
+ASM_PFX(InternalX86EnablePaging64):
+    cli
+    mov     DWORD [esp], .0         ; offset for far retf, seg is the 1st arg
+    mov     eax, cr4
+    or      al, (1 << 5)
+    mov     cr4, eax                    ; enable PAE
+    mov     ecx, 0xc0000080
+    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
+.0:
+    DB      0x67, 0x48                    ; 32-bit address size, 64-bit operand size
+    mov     ebx, [esp]                  ; mov rbx, [esp]
+    DB      0x67, 0x48
+    mov     ecx, [esp + 8]              ; mov rcx, [esp + 8]
+    DB      0x67, 0x48
+    mov     edx, [esp + 0x10]            ; mov rdx, [esp + 10h]
+    DB      0x67, 0x48
+    mov     esp, [esp + 0x18]            ; mov rsp, [esp + 18h]
+    DB      0x48
+    add     esp, -0x20                   ; add rsp, -20h
+    call    ebx                         ; call rbx
+    hlt                                 ; no one should get here
+