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34 lines
639 B
C
34 lines
639 B
C
/** @file
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AsmWriteCr4 function
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Writes a value to Control Register 4 (CR4).
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Writes and returns a new value to CR4. This function is only available on
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IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
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@param Value The value to write to CR4.
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@return The value written to CR4.
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**/
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UINTN
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EFIAPI
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AsmWriteCr4 (
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UINTN Value
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)
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{
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_asm {
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mov eax, Value
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_emit 0x0f // mov cr4, eax
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_emit 0x22
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_emit 0xE0
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}
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}
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