4 #include <linux/ioctl.h>
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 */
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)
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);
25 #endif /* _LINUX_NVRAM_H */
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