Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ia32 / EnablePaging64.asm

diff --git a/OldMdePkg/Library/BaseLib/Ia32/EnablePaging64.asm b/OldMdePkg/Library/BaseLib/Ia32/EnablePaging64.asm
new file mode 100644 (file)
index 0000000..435bb39
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/EnablePaging64.asm
@@ -0,0 +1,68 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation\r
+; All rights reserved. This program and the accompanying materials\r
+; are licensed and made available under the terms and conditions of the BSD License\r
+; which accompanies this distribution.  The full text of the license may be found at\r
+; http://opensource.org/licenses/bsd-license.php\r
+;\r
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+; Module Name:\r
+;\r
+;   EnablePaging64.Asm\r
+;\r
+; Abstract:\r
+;\r
+;   AsmEnablePaging64 function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .686p\r
+    .model  flat,C\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+; VOID\r
+; EFIAPI\r
+; InternalX86EnablePaging64 (\r
+;   IN      UINT16                    Cs,\r
+;   IN      UINT64                    EntryPoint,\r
+;   IN      UINT64                    Context1,  OPTIONAL\r
+;   IN      UINT64                    Context2,  OPTIONAL\r
+;   IN      UINT64                    NewStack\r
+;   );\r
+;------------------------------------------------------------------------------\r
+InternalX86EnablePaging64 PROC\r
+    cli\r
+    mov     [esp], @F                   ; offset for far retf, seg is the 1st arg\r
+    mov     eax, cr4\r
+    or      al, (1 SHL 5)\r
+    mov     cr4, eax                    ; enable PAE\r
+    mov     ecx, 0c0000080h\r
+    rdmsr\r
+    or      ah, 1                       ; set LME\r
+    wrmsr\r
+    mov     eax, cr0\r
+    bts     eax, 31                     ; set PG\r
+    mov     cr0, eax                    ; enable paging\r
+    retf                                ; topmost 2 dwords hold the address\r
+@@:                                     ; long mode starts here\r
+    DB      67h, 48h                    ; 32-bit address size, 64-bit operand size\r
+    mov     ebx, [esp]                  ; mov rbx, [esp]\r
+    DB      67h, 48h\r
+    mov     ecx, [esp + 8]              ; mov rcx, [esp + 8]\r
+    DB      67h, 48h\r
+    mov     edx, [esp + 10h]            ; mov rdx, [esp + 10h]\r
+    DB      67h, 48h\r
+    mov     esp, [esp + 18h]            ; mov rsp, [esp + 18h]\r
+    DB      48h\r
+    add     esp, -20h                   ; add rsp, -20h\r
+    call    ebx                         ; call rbx\r
+    hlt                                 ; no one should get here\r
+InternalX86EnablePaging64 ENDP\r
+\r
+    END\r