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

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

diff --git a/OldMdePkg/Library/BaseLib/Ia32/EnablePaging64.S b/OldMdePkg/Library/BaseLib/Ia32/EnablePaging64.S
new file mode 100644 (file)
index 0000000..ffa9beb
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/EnablePaging64.S
@@ -0,0 +1,63 @@
+#------------------------------------------------------------------------------\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
+#   InternalX86EnablePaging64 function\r
+#\r
+# Notes:\r
+#\r
+#------------------------------------------------------------------------------\r
+\r
+.globl ASM_PFX(InternalX86EnablePaging64)\r
+\r
+#------------------------------------------------------------------------------\r
+# VOID\r
+# EFIAPI\r
+# InternalX86EnablePaging64 (\r
+#   IN      UINT16                    CodeSelector,\r
+#   IN      UINT64                    EntryPoint,\r
+#   IN      UINT64                    Context1,    OPTIONAL\r
+#   IN      UINT64                    Context2,    OPTIONAL\r
+#   IN      UINT64                    NewStack\r
+#   );\r
+#------------------------------------------------------------------------------\r
+ASM_PFX(InternalX86EnablePaging64):\r
+    cli\r
+    movl    $LongStart, (%esp)\r
+    movl    %cr4, %eax\r
+    orb     $0x20, %al\r
+    movl    %eax, %cr4                  # enable PAE\r
+    movl    $0xc0000080, %ecx\r
+    rdmsr\r
+    orb     $1, %ah                     # set LME\r
+    wrmsr\r
+    movl    %cr0, %eax\r
+    btsl    $31, %eax\r
+    movl    %eax, %cr0                  # enable paging\r
+    lret\r
+LongStart:                              # long mode starts here\r
+    .byte   0x67, 0x48\r
+    movl    (%esp), %ebx                # mov rbx, [esp]\r
+    .byte   0x67, 0x48\r
+    movl    8(%esp), %ecx               # mov rcx, [esp + 8]\r
+    .byte   0x67, 0x48\r
+    movl    0x10(%esp), %edx            # mov rdx, [esp + 10h]\r
+    .byte   0x67, 0x48\r
+    movl    0x18(%esp), %esp            # mov rsp, [esp + 18h]\r
+    .byte   0x48\r
+    addl    $0x-20, %esp                # add rsp, -20h\r
+    call    *%ebx                       # call rbx\r
+    jmp     .\r