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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Helpers/definitions related to MSR access.
*/
#ifndef BOOT_MSR_H
#define BOOT_MSR_H
#include <asm/shared/msr.h>
/*
* The kernel proper already defines rdmsr()/wrmsr(), but they are not for the
* boot kernel since they rely on tracepoint/exception handling infrastructure
* that's not available here.
*/
static inline void boot_rdmsr(unsigned int reg, struct msr *m)
{
asm volatile("rdmsr" : "=a" (m->l), "=d" (m->h) : "c" (reg));
}
static inline void boot_wrmsr(unsigned int reg, const struct msr *m)
{
asm volatile("wrmsr" : : "c" (reg), "a"(m->l), "d" (m->h) : "memory");
}
#endif /* BOOT_MSR_H */
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