linux/include/linux/nvram.h
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   1#ifndef _LINUX_NVRAM_H
   2#define _LINUX_NVRAM_H
   3
   4#include <linux/ioctl.h>
   5
   6/* /dev/nvram ioctls */
   7#define NVRAM_INIT      _IO('p', 0x40) /* initialize NVRAM and set checksum */
   8#define NVRAM_SETCKS    _IO('p', 0x41) /* recalculate checksum */
   9
  10/* for all current systems, this is where NVRAM starts */
  11#define NVRAM_FIRST_BYTE    14
  12/* all these functions expect an NVRAM offset, not an absolute */
  13#define NVRAM_OFFSET(x)   ((x)-NVRAM_FIRST_BYTE)
  14
  15#ifdef __KERNEL__
  16/* __foo is foo without grabbing the rtc_lock - get it yourself */
  17extern unsigned char __nvram_read_byte(int i);
  18extern unsigned char nvram_read_byte(int i);
  19extern void __nvram_write_byte(unsigned char c, int i);
  20extern void nvram_write_byte(unsigned char c, int i);
  21extern int __nvram_check_checksum(void);
  22extern int nvram_check_checksum(void);
  23#endif
  24
  25#endif  /* _LINUX_NVRAM_H */
  26
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