src/hw/cmos.h

// Definitions for X86 CMOS non-volatile memory access.
//
// Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#ifndef __CMOS_H
#define __CMOS_H

// Standard BIOS RTC chip entries
#define CMOS_RTC_SECONDS         0x00
#define CMOS_RTC_SECONDS_ALARM   0x01
#define CMOS_RTC_MINUTES         0x02
#define CMOS_RTC_MINUTES_ALARM   0x03
#define CMOS_RTC_HOURS           0x04
#define CMOS_RTC_HOURS_ALARM     0x05
#define CMOS_RTC_DAY_WEEK        0x06
#define CMOS_RTC_DAY_MONTH       0x07
#define CMOS_RTC_MONTH           0x08
#define CMOS_RTC_YEAR            0x09
#define CMOS_STATUS_A            0x0a
#define CMOS_STATUS_B            0x0b
#define CMOS_STATUS_C            0x0c
#define CMOS_STATUS_D            0x0d
#define CMOS_RESET_CODE          0x0f

// QEMU cmos config fields.  DO NOT ADD MORE.  (All new content should
// be passed via the fw_cfg "file" interface.)
#define CMOS_FLOPPY_DRIVE_TYPE   0x10
#define CMOS_DISK_DATA           0x12
#define CMOS_EQUIPMENT_INFO      0x14
#define CMOS_DISK_DRIVE1_TYPE    0x19
#define CMOS_DISK_DRIVE2_TYPE    0x1a
#define CMOS_DISK_DRIVE1_CYL     0x1b
#define CMOS_DISK_DRIVE2_CYL     0x24
#define CMOS_MEM_EXTMEM_LOW      0x30
#define CMOS_MEM_EXTMEM_HIGH     0x31
#define CMOS_CENTURY             0x32
#define CMOS_MEM_EXTMEM2_LOW     0x34
#define CMOS_MEM_EXTMEM2_HIGH    0x35
#define CMOS_BIOS_BOOTFLAG1      0x38
#define CMOS_BIOS_DISKTRANSFLAG  0x39
#define CMOS_BIOS_BOOTFLAG2      0x3d
#define CMOS_MEM_HIGHMEM_LOW     0x5b
#define CMOS_MEM_HIGHMEM_MID     0x5c
#define CMOS_MEM_HIGHMEM_HIGH    0x5d
#define CMOS_BIOS_SMP_COUNT      0x5f

// CMOS_FLOPPY_DRIVE_TYPE bitdefs
#define CFD_NO_DRIVE 0
#define CFD_360KB    1
#define CFD_12MB     2
#define CFD_720KB    3
#define CFD_144MB    4
#define CFD_288MB    5

#ifndef __ASSEMBLY__

#include "ioport.h" // inb, outb

static inline u8
inb_cmos(u8 reg)
{
    reg |= NMI_DISABLE_BIT;
    outb(reg, PORT_CMOS_INDEX);
    return inb(PORT_CMOS_DATA);
}

static inline void
outb_cmos(u8 val, u8 reg)
{
    reg |= NMI_DISABLE_BIT;
    outb(reg, PORT_CMOS_INDEX);
    outb(val, PORT_CMOS_DATA);
}

#endif // !__ASSEMBLY__

#endif // cmos.h