include/linux/nvram.h

   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 */
  17 extern unsigned char __nvram_read_byte(int i);
  18 extern unsigned char nvram_read_byte(int i);
  19 extern void __nvram_write_byte(unsigned char c, int i);
  20 extern void nvram_write_byte(unsigned char c, int i);
  21 extern int __nvram_check_checksum(void);
  22 extern int nvram_check_checksum(void);
  23 #endif
  24
  25 #endif  /* _LINUX_NVRAM_H */