1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Helpers/definitions related to MSR access.
 4 */
 5
 6#ifndef BOOT_MSR_H
 7#define BOOT_MSR_H
 8
 9#include <asm/shared/msr.h>
10
11/*
12 * The kernel proper already defines rdmsr()/wrmsr(), but they are not for the
13 * boot kernel since they rely on tracepoint/exception handling infrastructure
14 * that's not available here.
15 */
16static inline void boot_rdmsr(unsigned int reg, struct msr *m)
17{
18	asm volatile("rdmsr" : "=a" (m->l), "=d" (m->h) : "c" (reg));
19}
20
21static inline void boot_wrmsr(unsigned int reg, const struct msr *m)
22{
23	asm volatile("wrmsr" : : "c" (reg), "a"(m->l), "d" (m->h) : "memory");
24}
25
26#endif /* BOOT_MSR_H */