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71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/*
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** @file bios.h
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**
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** @author Warren R. Carithers
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**
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** BIOS-related declarations
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*/
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#ifndef BIOS_H_
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#define BIOS_H_
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/*
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** BIOS-related memory addresses
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*/
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#define BIOS_BDA 0x0400
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/*
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** Selected BIOS interrupt numbers
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*/
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#define BIOS_TIMER 0x08
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#define BIOS_KBD 0x09
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#define BIOS_VIDEO 0x10
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#define BIOS_EQUIP 0x11
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#define BIOS_MSIZ 0x12
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#define BIOS_DISK 0x13
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#define BIOS_SERIAL 0x14
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#define BIOS_MISC 0x15
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#define BIOS_KBDSVC 0x16
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#define BIOS_PRTSVC 0x17
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#define BIOS_BOOT 0x19
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#define BIOS_RTCPCI 0x1a
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// BIOS video commands (AH)
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#define BV_W_ADV 0x0e
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// BIOS disk commands (AH)
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#define BD_RESET 0x00
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#define BD_CHECK 0x01
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#define BD_RDSECT 0x02
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#define BD_WRSECT 0x03
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#define BD_PARAMS 0x08
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// BIOS disk commands with parameters (AX)
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#define BD_READ(n) ((BD_RDSECT << 8) | (n))
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#define BD_READ1 0x0201
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// CMOS ports (used for masking NMIs)
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#define CMOS_ADDR 0x70
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#define CMOS_DATA 0x71
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// important related commands
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#define NMI_ENABLE 0x00
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#define NMI_DISABLE 0x80
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/*
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** Physical Memory Map Table (0000:2D00 - 0000:7c00)
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**
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** Primarily used with the BIOS_MISC interrupt
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*/
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#define MMAP_SEG 0x02D0
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#define MMAP_DISP 0x0000
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#define MMAP_ADDR ((MMAP_SEG << 4) + MMAP_DISP)
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#define MMAP_SECTORS 0x0a
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#define MMAP_ENT 24 /* bytes per entry */
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#define MMAP_MAX_ENTS (BOOT_ADDR - MMAP_ADDR - 4) / 24
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#define MMAP_CODE 0xE820 /* int 0x15 code */
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#define MMAP_MAGIC_NUM 0x534D4150 /* for 0xE820 interrupt */
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#endif
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