/* 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 */