You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
977 B
40 lines
977 B
/** @file
|
|
AsmWriteCr4 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 4 (CR4).
|
|
|
|
Writes and returns a new value to CR4. 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 CR4.
|
|
|
|
@return The value written to CR4.
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
AsmWriteCr4 (
|
|
UINTN Value
|
|
)
|
|
{
|
|
_asm {
|
|
mov eax, Value
|
|
_emit 0x0f // mov cr4, eax
|
|
_emit 0x22
|
|
_emit 0xE0
|
|
}
|
|
}
|
|
|