Release 4.7 include/uapi/linux/nvram.h

#ifndef _UAPI_LINUX_NVRAM_H

#define _UAPI_LINUX_NVRAM_H

#include <linux/ioctl.h>

/* /dev/nvram ioctls */

#define NVRAM_INIT	_IO('p', 0x40) 
/* initialize NVRAM and set checksum */

#define NVRAM_SETCKS	_IO('p', 0x41) 
/* recalculate checksum */

/* for all current systems, this is where NVRAM starts */

#define NVRAM_FIRST_BYTE    14
/* all these functions expect an NVRAM offset, not an absolute */

#define NVRAM_OFFSET(x)   ((x)-NVRAM_FIRST_BYTE)


#endif /* _UAPI_LINUX_NVRAM_H */
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