diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/Ia32/WriteCr0.c')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/Ia32/WriteCr0.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/WriteCr0.c b/Core/MdePkg/Library/BaseLib/Ia32/WriteCr0.c new file mode 100644 index 0000000000..29bd3483af --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/Ia32/WriteCr0.c @@ -0,0 +1,37 @@ +/** @file
+ AsmWriteCr0 function
+
+ Copyright (c) 2006 - 2008, 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.
+
+**/
+
+/**
+ Writes a value to Control Register 0 (CR0).
+
+ Writes and returns a new value to CR0. This function is only available on
+ IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
+
+ @param Value The value to write to CR0.
+
+ @return The value written to CR0.
+
+**/
+UINTN
+EFIAPI
+AsmWriteCr0 (
+ UINTN Value
+ )
+{
+ _asm {
+ mov eax, Value
+ mov cr0, eax
+ }
+}
+
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