diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
---|---|---|
committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseLib/X64/DisablePaging64.S | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/X64/DisablePaging64.S')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/X64/DisablePaging64.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/DisablePaging64.S b/Core/MdePkg/Library/BaseLib/X64/DisablePaging64.S new file mode 100644 index 0000000000..676e9e175a --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/X64/DisablePaging64.S @@ -0,0 +1,82 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2009, 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:
+#
+# DisablePaging64.S
+#
+# Abstract:
+#
+# AsmDisablePaging64 function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+
+#------------------------------------------------------------------------------
+# VOID
+# EFIAPI
+# InternalX86DisablePaging64 (
+# IN UINT16 Cs,
+# IN UINT32 EntryPoint,
+# IN UINT32 Context1, OPTIONAL
+# IN UINT32 Context2, OPTIONAL
+# IN UINT32 NewStack
+# );
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalX86DisablePaging64)
+ASM_PFX(InternalX86DisablePaging64):
+ cli
+ lea L1(%rip), %rsi # rsi <- The start address of transition code
+ mov 0x28(%rsp), %edi # rdi <- New stack
+ lea _mTransitionEnd(%rip), %rax # rax <- end of transition code
+ sub %rsi, %rax # rax <- The size of transition piece code
+ add $4, %rax # round rax up to the next 4 byte boundary
+ and $0xfc, %al
+ sub %rax, %rdi # rdi <- use stack to hold transition code
+ mov %edi, %r10d # r10 <- The start address of transicition code below 4G
+ push %rcx # save rcx to stack
+ mov %rax, %rcx # rcx <- The size of transition piece code
+ rep
+ movsb # copy transition code to (new stack - 64byte) below 4G
+ pop %rcx # restore rcx
+
+ mov %r8d, %esi
+ mov %r9d, %edi
+ mov %r10d, %eax
+ sub $4, %eax
+ push %rcx # push Cs to stack
+ push %r10 # push address of transition code on stack
+ .byte 0x48, 0xcb # retq: Use far return to load CS register from stack
+ # (Use raw byte code since some GNU assemblers generates incorrect code for "retq")
+L1:
+ mov %eax,%esp # set up new stack
+ mov %cr0,%rax
+ btr $0x1f,%eax # clear CR0.PG
+ mov %rax,%cr0 # disable paging
+
+ mov %edx,%ebx # save EntryPoint to ebx, for rdmsr will overwrite edx
+ mov $0xc0000080,%ecx
+ rdmsr
+ and $0xfe,%ah # clear LME
+ wrmsr
+ mov %cr4,%rax
+ and $0xdf,%al # clear PAE
+ mov %rax,%cr4
+ push %rdi # push Context2
+ push %rsi # push Context1
+ callq *%rbx # transfer control to EntryPoint
+ jmp . # no one should get here
+
+_mTransitionEnd :
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