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The C and C++ Include Header Files

/usr/include/linux/nvram.h


$ cat -n /usr/include/linux/nvram.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_NVRAM_H
     3	#define _LINUX_NVRAM_H
     4	
     5	#include <linux/ioctl.h>
     6	
     7	/* /dev/nvram ioctls */
     8	#define NVRAM_INIT	_IO('p', 0x40) /* initialize NVRAM and set checksum */
     9	#define NVRAM_SETCKS	_IO('p', 0x41) /* recalculate checksum */
    10	
    11	/* for all current systems, this is where NVRAM starts */
    12	#define NVRAM_FIRST_BYTE    14
    13	/* all these functions expect an NVRAM offset, not an absolute */
    14	#define NVRAM_OFFSET(x)   ((x)-NVRAM_FIRST_BYTE)
    15	
    16	
    17	#endif /* _LINUX_NVRAM_H */