Added a 64-bit version of EnablePaging64() on X64. AsmEnablePaging64() is the transit...

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / EnablePaging64.asm

diff --git a/MdePkg/Library/BaseLib/X64/EnablePaging64.asm b/MdePkg/Library/BaseLib/X64/EnablePaging64.asm
new file mode 100644 (file)
index 0000000..0d64c55
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/EnablePaging64.asm
@@ -0,0 +1,61 @@
+;------------------------------------------------------------------------------\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
+    .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     dword ptr [rsp], @F         ; offset for far retf, seg is the 1st arg\r
+    mov     rax, cr4                    ; mov eax, cr4\r
+    or      al, (1 SHL 5)\r
+    mov     cr4, rax                    ; enable PAE\r
+    mov     ecx, 0c0000080h\r
+    rdmsr\r
+    or      ah, 1                       ; set LME\r
+    wrmsr\r
+    mov     rax, cr0                    ; mov eax, cr0\r
+    bts     eax, 31\r
+    mov     cr0, rax                    ; enable paging\r
+    retf\r
+@@:                                     ; long mode starts here\r
+    mov     rbx, [esp]\r
+    mov     rcx, [esp + 8]\r
+    mov     rdx, [esp + 10h]\r
+    mov     rsp, [esp + 18h]\r
+    add     rsp, -20h\r
+    call    rbx\r
+    jmp     $                           ; halt processor if EntryPoint() returned\r
+InternalX86EnablePaging64 ENDP\r
+\r
+    END\r