#ifndef _LINUX_NVRAM_H
  #define _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)
  
  #ifdef __KERNEL__
  /* __foo is foo without grabbing the rtc_lock - get it yourself */
  extern unsigned char __nvram_read_byte(int i);
  extern unsigned char nvram_read_byte(int i);
  extern void __nvram_write_byte(unsigned char c, int i);
  extern void nvram_write_byte(unsigned char c, int i);
  extern int __nvram_check_checksum(void);
  extern int nvram_check_checksum(void);

  #endif
  
  #endif  /* _LINUX_NVRAM_H */