From: bxing <bxing@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 25 Jul 2006 08:30:02 +0000 (+0000)
Subject: Added a 64-bit version of EnablePaging64() on X64. AsmEnablePaging64() is the transit... 
X-Git-Tag: edk2-stable201903~24780
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=ebca8169891c61ff3bfe9cc226a65a137e32c1ab

Added a 64-bit version of EnablePaging64() on X64. AsmEnablePaging64() is the transition code to switch the processor from 32-bit into 64-bit long mode and thus is typically linked with 32-bit images only. However, it's desired to link the transition code into a 64-bit image in some special cases. CPU driver is a good example among those.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1092 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/MdePkg/Library/BaseLib/BaseLib.msa b/MdePkg/Library/BaseLib/BaseLib.msa
index 3f0224ba3b..403c6e3b8c 100644
--- a/MdePkg/Library/BaseLib/BaseLib.msa
+++ b/MdePkg/Library/BaseLib/BaseLib.msa
@@ -378,6 +378,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     <Filename SupArchList="X64">X64/ReadPmc.asm</Filename>
     <Filename SupArchList="X64">X64/Monitor.asm</Filename>
     <Filename SupArchList="X64">X64/Mwait.asm</Filename>
+    <Filename SupArchList="X64">X64/EnablePaging64.asm</Filename>
     <Filename SupArchList="X64">X64/DisablePaging64.asm</Filename>
     <Filename SupArchList="X64">X64/Wbinvd.asm</Filename>
     <Filename SupArchList="X64">X64/Invd.asm</Filename>
diff --git a/MdePkg/Library/BaseLib/X64/EnablePaging64.asm b/MdePkg/Library/BaseLib/X64/EnablePaging64.asm
new file mode 100644
index 0000000000..0d64c55134
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/EnablePaging64.asm
@@ -0,0 +1,61 @@
+;------------------------------------------------------------------------------
+;
+; 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
+    mov     dword ptr [rsp], @F         ; 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
+    jmp     $                           ; halt processor if EntryPoint() returned
+InternalX86EnablePaging64 ENDP
+
+    END
diff --git a/MdePkg/Library/BaseLib/X64/Non-existing.c b/MdePkg/Library/BaseLib/X64/Non-existing.c
index a1c4677dad..4f0c932380 100644
--- a/MdePkg/Library/BaseLib/X64/Non-existing.c
+++ b/MdePkg/Library/BaseLib/X64/Non-existing.c
@@ -108,46 +108,3 @@ InternalX86DisablePaging32 (
   //
   ASSERT (FALSE);
 }
-
-/**
-  Enables the 64-bit paging mode on the CPU.
-
-  Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables
-  must be properly initialized prior to calling this service. This function
-  assumes the current execution mode is 32-bit protected mode with flat
-  descriptors. This function is only available on IA-32. After the 64-bit
-  paging mode is enabled, control is transferred to the function specified by
-  EntryPoint using the new stack specified by NewStack and passing in the
-  parameters specified by Context1 and Context2. Context1 and Context2 are
-  optional and may be 0. The function EntryPoint must never return.
-
-  @param  Cs          The 16-bit selector to load in the CS before EntryPoint
-                      is called. The descriptor in the GDT that this selector
-                      references must be setup for long mode.
-  @param  EntryPoint  The 64-bit virtual address of the function to call with
-                      the new stack after paging is enabled.
-  @param  Context1    The 64-bit virtual address of the context to pass into
-                      the EntryPoint function as the first parameter after
-                      paging is enabled.
-  @param  Context2    The 64-bit virtual address of the context to pass into
-                      the EntryPoint function as the second parameter after
-                      paging is enabled.
-  @param  NewStack    The 64-bit virtual address of the new stack to use for
-                      the EntryPoint function after paging is enabled.
-
-**/
-VOID
-EFIAPI
-InternalX86EnablePaging64 (
-  IN      UINT16                    Cs,
-  IN      UINT64                    EntryPoint,
-  IN      UINT64                    Context1,  OPTIONAL
-  IN      UINT64                    Context2,  OPTIONAL
-  IN      UINT64                    NewStack
-  )
-{
-  //
-  // This function cannot work on X64 platform
-  //
-  ASSERT (FALSE);
-}