mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-24 11:45:27 +01:00
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
/** @file
|
|
AsmWriteMsr64 function
|
|
|
|
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
|
|
|
|
|
|
/**
|
|
Writes a 64-bit value to a Machine Specific Register(MSR), and returns the
|
|
value.
|
|
|
|
Writes the 64-bit value specified by Value to the MSR specified by Index. The
|
|
64-bit value written to the MSR is returned. No parameter checking is
|
|
performed on Index or Value, and some of these may cause CPU exceptions. The
|
|
caller must either guarantee that Index and Value are valid, or the caller
|
|
must establish proper exception handlers. This function is only available on
|
|
IA-32 and x64.
|
|
|
|
@param Index The 32-bit MSR index to write.
|
|
@param Value The 64-bit value to write to the MSR.
|
|
|
|
@return Value
|
|
|
|
**/
|
|
UINT64
|
|
EFIAPI
|
|
AsmWriteMsr64 (
|
|
IN UINT32 Index,
|
|
IN UINT64 Value
|
|
)
|
|
{
|
|
_asm {
|
|
mov edx, dword ptr [Value + 4]
|
|
mov eax, dword ptr [Value + 0]
|
|
mov ecx, Index
|
|
wrmsr
|
|
}
|
|
}
|
|
|