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 LGPLv3 license.
9 #define CMOS_RTC_SECONDS 0x00
10 #define CMOS_RTC_SECONDS_ALARM 0x01
11 #define CMOS_RTC_MINUTES 0x02
12 #define CMOS_RTC_MINUTES_ALARM 0x03
13 #define CMOS_RTC_HOURS 0x04
14 #define CMOS_RTC_HOURS_ALARM 0x05
15 #define CMOS_RTC_DAY_WEEK 0x06
16 #define CMOS_RTC_DAY_MONTH 0x07
17 #define CMOS_RTC_MONTH 0x08
18 #define CMOS_RTC_YEAR 0x09
19 #define CMOS_STATUS_A 0x0a
20 #define CMOS_STATUS_B 0x0b
21 #define CMOS_STATUS_C 0x0c
22 #define CMOS_STATUS_D 0x0d
23 #define CMOS_RESET_CODE 0x0f
24 #define CMOS_FLOPPY_DRIVE_TYPE 0x10
25 #define CMOS_DISK_DATA 0x12
26 #define CMOS_EQUIPMENT_INFO 0x14
27 #define CMOS_DISK_DRIVE1_TYPE 0x19
28 #define CMOS_DISK_DRIVE2_TYPE 0x1a
29 #define CMOS_DISK_DRIVE1_CYL 0x1b
30 #define CMOS_DISK_DRIVE2_CYL 0x24
31 #define CMOS_MEM_EXTMEM_LOW 0x30
32 #define CMOS_MEM_EXTMEM_HIGH 0x31
33 #define CMOS_CENTURY 0x32
34 #define CMOS_MEM_EXTMEM2_LOW 0x34
35 #define CMOS_MEM_EXTMEM2_HIGH 0x35
36 #define CMOS_BIOS_BOOTFLAG1 0x38
37 #define CMOS_BIOS_DISKTRANSFLAG 0x39
38 #define CMOS_BIOS_BOOTFLAG2 0x3d
39 #define CMOS_MEM_HIGHMEM_LOW 0x5b
40 #define CMOS_MEM_HIGHMEM_MID 0x5c
41 #define CMOS_MEM_HIGHMEM_HIGH 0x5d
42 #define CMOS_BIOS_SMP_COUNT 0x5f
44 // CMOS_FLOPPY_DRIVE_TYPE bitdefs
45 #define CFD_NO_DRIVE 0
54 #include "ioport.h" // inb, outb
59 reg |= NMI_DISABLE_BIT;
60 outb(reg, PORT_CMOS_INDEX);
61 return inb(PORT_CMOS_DATA);
65 outb_cmos(u8 val, u8 reg)
67 reg |= NMI_DISABLE_BIT;
68 outb(reg, PORT_CMOS_INDEX);
69 outb(val, PORT_CMOS_DATA);
72 #endif // !__ASSEMBLY__