1 // Definitions for X86 CMOS non-volatile memory access.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
5 // This file may be distributed under the terms of the GNU GPLv3 license.
9 #include "ioport.h" // inb, outb
11 #define CMOS_RTC_SECONDS 0x00
12 #define CMOS_RTC_SECONDS_ALARM 0x01
13 #define CMOS_RTC_MINUTES 0x02
14 #define CMOS_RTC_MINUTES_ALARM 0x03
15 #define CMOS_RTC_HOURS 0x04
16 #define CMOS_RTC_HOURS_ALARM 0x05
17 #define CMOS_STATUS_B 0x0b
18 #define CMOS_RESET_CODE 0x0f
19 #define CMOS_FLOPPY_DRIVE_TYPE 0x10
20 #define CMOS_EQUIPMENT_INFO 0x14
21 #define CMOS_EXTMEM_LOW 0x30
22 #define CMOS_EXTMEM_HIGH 0x31
23 #define CMOS_EXTMEM2_LOW 0x34
24 #define CMOS_EXTMEM2_HIGH 0x35
26 // CMOS_STATUS_B bitdefs
27 #define CSB_EN_ALARM_IRQ (1<<5)
29 // CMOS_FLOPPY_DRIVE_TYPE bitdefs
30 #define CFD_NO_DRIVE 0
40 outb(reg, PORT_CMOS_INDEX);
41 return inb(PORT_CMOS_DATA);
45 outb_cmos(u8 val, u8 reg)
47 outb(reg, PORT_CMOS_INDEX);
48 outb(val, PORT_CMOS_DATA);