63 static void	nvram_set_csum(u_char csum);
64 static int	nvram_csum_valid(u_char csum);
182 	uint8_t csum;  in nvram_csum()  local
185 	for (csum = 0, nreg = MC_NVRAM_START; nreg < MC_NVRAM_CSUM; nreg++)  in nvram_csum()
186 		csum += mc146818_read(RTC, nreg);  in nvram_csum()
187 	return csum;  in nvram_csum()
191 nvram_csum_valid(u_char csum)  in nvram_csum_valid()  argument
194 	if (((~csum & 0xff) != mc146818_read(RTC, MC_NVRAM_CSUM))  in nvram_csum_valid()
195 		|| (csum != mc146818_read(RTC, MC_NVRAM_CSUM + 1)))  in nvram_csum_valid()
201 nvram_set_csum(u_char csum)  in nvram_set_csum()  argument
204 	mc146818_write(RTC, MC_NVRAM_CSUM,    ~csum);  in nvram_set_csum()
205 	mc146818_write(RTC, MC_NVRAM_CSUM + 1, csum);  in nvram_set_csum()