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/usr/include/x86_64-linux-gnu/asm/msr.h is in linux-libc-dev 3.2.0-23.36.

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#ifndef _ASM_X86_MSR_H
#define _ASM_X86_MSR_H

#include <asm/msr-index.h>

#ifndef __ASSEMBLY__

#include <linux/types.h>
#include <linux/ioctl.h>

#define X86_IOC_RDMSR_REGS	_IOWR('c', 0xA0, __u32[8])
#define X86_IOC_WRMSR_REGS	_IOWR('c', 0xA1, __u32[8])

#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_MSR_H */