1/*===--------------- usermsrintrin.h - USERMSR intrinsics -----------------===
2 *
3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 * See https://llvm.org/LICENSE.txt for license information.
5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 *
7 *===-----------------------------------------------------------------------===
8 */
9#ifndef __X86GPRINTRIN_H
10#error "Never use <usermsrintrin.h> directly; include <x86gprintrin.h> instead."
11#endif // __X86GPRINTRIN_H
12
13#ifndef __USERMSRINTRIN_H
14#define __USERMSRINTRIN_H
15#ifdef __x86_64__
16
17/// Reads the contents of a 64-bit MSR specified in \a __A into \a dst.
18///
19/// This intrinsic corresponds to the <c> URDMSR </c> instruction.
20/// \param __A
21/// An unsigned long long.
22///
23/// \code{.operation}
24/// DEST := MSR[__A]
25/// \endcode
26static __inline__ unsigned long long
27 __attribute__((__always_inline__, __nodebug__, __target__("usermsr")))
28 _urdmsr(unsigned long long __A) {
29 return __builtin_ia32_urdmsr(__A);
30}
31
32/// Writes the contents of \a __B into the 64-bit MSR specified in \a __A.
33///
34/// This intrinsic corresponds to the <c> UWRMSR </c> instruction.
35///
36/// \param __A
37/// An unsigned long long.
38/// \param __B
39/// An unsigned long long.
40///
41/// \code{.operation}
42/// MSR[__A] := __B
43/// \endcode
44static __inline__ void
45 __attribute__((__always_inline__, __nodebug__, __target__("usermsr")))
46 _uwrmsr(unsigned long long __A, unsigned long long __B) {
47 return __builtin_ia32_uwrmsr(__A, __B);
48}
49
50#endif // __x86_64__
51#endif // __USERMSRINTRIN_H