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/***
*bios.h - declarations for bios interface functions and supporting definitions
*
* Copyright (c) 1987-1988, Microsoft Corporation. All rights reserved.
*
*Purpose:
* This file declares the constants, structures, and functions
* used for accessing and using various BIOS interfaces.
*
*******************************************************************************/
#ifndef NO_EXT_KEYS /* extensions enabled */
#define _CDECL cdecl
#else /* extensions not enabled */
#define _CDECL
#endif /* NO_EXT_KEYS */
/* manifest constants for BIOS serial communications (RS-232) support */
/* serial port services */
#define _COM_INIT 0 /* init serial port */
#define _COM_SEND 1 /* send character */
#define _COM_RECEIVE 2 /* receive character */
#define _COM_STATUS 3 /* get serial port status */
/* serial port initializers. One and only one constant from each of the
* following four groups - character size, stop bit, parity, and baud rate -
* must be specified in the initialization byte.
*/
/* character size initializers */
#define _COM_CHR7 2 /* 7 bits characters */
#define _COM_CHR8 3 /* 8 bits characters */
/* stop bit values - on or off */
#define _COM_STOP1 0 /* 1 stop bit */
#define _COM_STOP2 4 /* 2 stop bits */
/* parity initializers */
#define _COM_NOPARITY 0 /* no parity */
#define _COM_ODDPARITY 8 /* odd parity */
#define _COM_EVENPARITY 24 /* even parity */
/* baud rate initializers */
#define _COM_110 0 /* 110 baud */
#define _COM_150 32 /* 150 baud */
#define _COM_300 64 /* 300 baud */
#define _COM_600 96 /* 600 baud */
#define _COM_1200 128 /* 1200 baud */
#define _COM_2400 160 /* 2400 baud */
#define _COM_4800 192 /* 4800 baud */
#define _COM_9600 224 /* 9600 baud */
/* manifest constants for BIOS disk support */
/* disk services */
#define _DISK_RESET 0 /* reset disk controller */
#define _DISK_STATUS 1 /* get disk status */
#define _DISK_READ 2 /* read disk sectors */
#define _DISK_WRITE 3 /* write disk sectors */
#define _DISK_VERIFY 4 /* verify disk sectors */
#define _DISK_FORMAT 5 /* format disk track */
/* struct used to send/receive information to/from the BIOS disk services */
#ifndef NO_EXT_KEYS /* extensions must be enabled */
#ifndef _DISKINFO_T_DEFINED
struct diskinfo_t {
unsigned drive;
unsigned head;
unsigned track;
unsigned sector;
unsigned nsectors;
void far *buffer;
};
#define _DISKINFO_T_DEFINED
#endif
#endif /* NO_EXT_KEYS */
/* manifest constants for BIOS keyboard support */
/* keyboard services */
#define _KEYBRD_READ 0 /* read next character from keyboard */
#define _KEYBRD_READY 1 /* check for keystroke */
#define _KEYBRD_SHIFTSTATUS 2 /* get current shift key status */
/* manifest constants for BIOS printer support */
/* printer services */
#define _PRINTER_WRITE 0 /* write character to printer */
#define _PRINTER_INIT 1 /* intialize printer */
#define _PRINTER_STATUS 2 /* get printer status */
/* manifest constants for BIOS time of day support */
/* time of day services */
#define _TIME_GETCLOCK 0 /* get current clock count */
#define _TIME_SETCLOCK 1 /* set current clock count */
#ifndef _REGS_DEFINED
/* word registers */
struct WORDREGS {
unsigned int ax;
unsigned int bx;
unsigned int cx;
unsigned int dx;
unsigned int si;
unsigned int di;
unsigned int cflag;
};
/* byte registers */
struct BYTEREGS {
unsigned char al, ah;
unsigned char bl, bh;
unsigned char cl, ch;
unsigned char dl, dh;
};
/* general purpose registers union -
* overlays the corresponding word and byte registers.
*/
union REGS {
struct WORDREGS x;
struct BYTEREGS h;
};
/* segment registers */
struct SREGS {
unsigned int es;
unsigned int cs;
unsigned int ss;
unsigned int ds;
};
#define _REGS_DEFINED
#endif /* _REGS_DEFINED */
/* function prototypes */
unsigned _CDECL _bios_equiplist(void);
unsigned _CDECL _bios_keybrd(unsigned);
unsigned _CDECL _bios_memsize(void);
unsigned _CDECL _bios_printer(unsigned, unsigned, unsigned);
unsigned _CDECL _bios_serialcom(unsigned, unsigned, unsigned);
unsigned _CDECL _bios_timeofday(unsigned, long *);
int _CDECL int86(int, union REGS *, union REGS *);
int _CDECL int86x(int, union REGS *, union REGS *, struct SREGS *);
#ifndef NO_EXT_KEYS /* extensions must be enabled */
unsigned _CDECL _bios_disk(unsigned, struct diskinfo_t *);
#endif /* NO_EXT_KEYS */
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