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windows-nt/Source/XPSP1/NT/base/mvdm/softpc.new/base/inc/floppy.h
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2020-09-26 16:20:57 +08:00

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/*
* VPC-XT Revision 2.0
*
* Title : High Density Floppy BIOS Definitions
*
* Description : Definitions used in the floppy diskette BIOS emulation
*
* Author : Ross Beresford
*
* Notes :
*
*
*
*/
/* @(#)floppy.h 1.9 08/25/93 */
/*
* FLOPPY DATA AREAS: we maintain the same data variables as the real
* BIOS in case applications know of their significance and use them.
*/
/*
* THE SEEK STATUS:
*
* +---+---+---+---+---+---+---+---+
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* +---+---+---+---+---+---+---+---+
* ^ ^ ^ ^ ^ ^ ^ ^
* | | | | | | | |
* | | | | | | | +- set if drive A needs recalibrating
* | | | | | | |
* | | | | | | +----- set if drive B needs recalibrating
* | | | | | |
* | | | | | +--------- (set if drive C needs recalibrating)
* | | | | |
* | | | | +------------- (set if drive D needs recalibrating)
* | | | |
* | | | +----------------- )
* | | | )
* | | +--------------------- )- unused
* | | )
* | +------------------------- )
* |
* +----------------------------- set when an interrupt is acknowledged
*/
#define SEEK_STATUS (BIOS_VAR_START + 0x3e)
#define SS_RECAL_ON_0 (1 << 0)
#define SS_RECAL_ON_1 (1 << 1)
#define SS_RECAL_ON_2 (1 << 2)
#define SS_RECAL_ON_3 (1 << 3)
#define SS_RECAL_MASK (SS_RECAL_ON_0|SS_RECAL_ON_1| \
SS_RECAL_ON_2|SS_RECAL_ON_3)
#define SS_INT_OCCURRED (1 << 7)
/*
* THE MOTOR STATUS: this variable reflects the state of the
* Digital Output Register in the floppy adapter
*
* +---+---+---+---+---+---+---+---+
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* +---+---+---+---+---+---+---+---+
* ^ ^ ^ ^ ^ ^ ^ ^
* | | | | | | | |
* | | | | | | | +- set if drive A motor is running
* | | | | | | |
* | | | | | | +----- set if drive B motor is running
* | | | | | |
* | | | | | +--------- (set if drive C motor is running)
* | | | | |
* | | | | +------------- (set if drive D motor is running)
* | | | |
* | | | +----------------- ) number of the drive that is
* | | | )- currently selected in the
* | | +--------------------- ) floppy adapter
* | |
* | +------------------------- unused
* |
* +----------------------------- set during a write operation
*/
#define MS_MOTOR_0_ON (1 << 0)
#define MS_MOTOR_1_ON (1 << 1)
#define MS_MOTOR_2_ON (1 << 2)
#define MS_MOTOR_3_ON (1 << 3)
#define MS_MOTOR_ON_MASK (MS_MOTOR_0_ON|MS_MOTOR_1_ON| \
MS_MOTOR_2_ON|MS_MOTOR_3_ON)
#define MS_DRIVE_SELECT_0 (1 << 4)
#define MS_DRIVE_SELECT_1 (1 << 5)
#define MS_DRIVE_SELECT_MASK (MS_DRIVE_SELECT_0|MS_DRIVE_SELECT_1)
#define MS_WRITE_OP (1 << 7)
/*
* THE MOTOR COUNT: this counter shows how many timer ticks must
* elapse before the drive motors can be turned off. The timer
* interrupt handler decrements this value once per timer tick.
*/
#define MC_MAXIMUM (~0)
/*
* THE FLOPPY STATUS:
*
* +---+---+---+---+---+---+---+---+
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* +---+---+---+---+---+---+---+---+
* ^ ^ ^ ^ ^ ^ ^ ^
* | | | | | | | |
* | | | | | | | +- )
* | | | | | | | )
* | | | | | | +----- ) 0 if the last operation was
* | | | | | | )- carried out successfully;
* | | | | | +--------- ) otherwise one of various
* | | | | | ) error values
* | | | | +------------- )
* | | | |
* | | | +----------------- set when there is a CRC error
* | | |
* | | +--------------------- set when the FDC has a bug
* | |
* | +------------------------- set when a seek terminates abnormally
* |
* +----------------------------- set when there is a time out
*/
#define FLOPPY_STATUS (BIOS_VAR_START + 0x41)
#define FS_OK 0x00
#define FS_BAD_COMMAND 0x01
#define FS_BAD_ADDRESS_MARK 0x02
#define FS_WRITE_PROTECTED 0x03
#define FS_SECTOR_NOT_FOUND 0x04
#define FS_MEDIA_CHANGE 0x06
#define FS_DMA_ERROR 0x08
#define FS_DMA_BOUNDARY 0x09
#define FS_MEDIA_NOT_FOUND 0x0C
#define FS_CRC_ERROR (1 << 4)
#define FS_FDC_ERROR (1 << 5)
#define FS_SEEK_ERROR (1 << 6)
#define FS_TIME_OUT (1 << 7)
#define FS_NONSENSICAL (~0)
/*
* THE FDC STATUS: this array stores the result bytes returned from
* the floppy disk controller after a command has been executed.
*/
/*
* THE RATE STATUS: this variable controls data rate scanning,
* which is used to determine which of various types of media is
* actually installed in a floppy drive.
*
* +---+---+---+---+ Current data rate (reflects status of the
* | 7 | 6 | 5 | 4 | Digital Control Register in the floppy
* +---+---+---+---+ adapter)
*
* +---+---+---+---+
* | 3 | 2 | 1 | 0 | Last data rate to try
* +---+---+---+---+
* ^ ^ ^ ^
* | | | |
* | | | +- unused
* | | |
* | | +----- unused
* | |
* | +--------- ) 00 = 500 kbs data rate
* | )- 01 = 300 kbs data rate
* +------------- ) 10 = 250 kbs data rate
* 11 = 1000 kbs data rate
*
* next_rate() is used to cycle through the possible data rates
*/
#define RATE_STATUS (BIOS_VAR_START + 0x8B)
#define RS_300 (1 << 6)
#define RS_250 (1 << 7)
#define RS_500 (0)
#define RS_1000 (3 << 6)
#define RS_MASK (RS_300 | RS_250)
#ifdef NTVDM
/* On NT, don't cycle through RS_1000. Why? */
#define next_rate(rate) (rate == RS_1000? RS_500: \
(rate == RS_500 ? RS_250: \
(rate == RS_250 ? RS_300: RS_500)))
#else
#define next_rate(rate) (rate == RS_500 ? RS_250: \
(rate == RS_250 ? RS_300: \
(rate == RS_300 ? RS_1000: RS_500)))
#endif
/*
* Unused high density floppy variables
*/
#define HF_STATUS (BIOS_VAR_START + 0x8C)
#define HF_ERROR (BIOS_VAR_START + 0x8D)
#define HF_INT_FLAG (BIOS_VAR_START + 0x8E)
/*
* THE DRIVE CAPABILITY INDICATORS: this variable describes what
* features are supported by floppy drives A and B
*
* NB if Drive A supports 80 tracks, the BIOS assumes that the
* floppy adapter is a dual fixed disk/diskette adapter
*
* +---+---+---+---+
* | 7 | 6 | 5 | 4 | Drive B
* +---+---+---+---+
*
* +---+---+---+---+
* | 3 | 2 | 1 | 0 | Drive A
* +---+---+---+---+
* ^ ^ ^ ^
* | | | |
* | | | +- set if drive supports 80 tracks
* | | |
* | | +----- set for a multiple data rate drive
* | |
* | +--------- set if the drive capability is determined
* |
* +------------- unused
*
*/
#define DRIVE_CAPABILITY (BIOS_VAR_START + 0x8F)
#define DC_80_TRACK (1 << 0)
#define DC_DUAL DC_80_TRACK
#define DC_MULTI_RATE (1 << 1)
#define DC_DETERMINED (1 << 2)
#define DC_MASK (DC_80_TRACK|DC_MULTI_RATE|DC_DETERMINED)
/*
* THE DRIVE STATUS: one byte each for drive A and B; within the
* BIOS functions, the format is as follows:
*
* <- media bits -> <- drive bits ->
*
* +---+---+---+---+---+---+---+---+
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* +---+---+---+---+---+---+---+---+
* ^ ^ ^ ^ ^ ^ ^ ^
* | | | | | | | |
* | | | | | | | +- set if drive supports 80 tracks
* | | | | | | |
* | | | | | | +----- set for a multiple data rate drive
* | | | | | |
* | | | | | +--------- set if capability is determined
* | | | | |
* | | | | +------------- unused
* | | | |
* | | | +----------------- set when media is determined
* | | |
* | | +--------------------- set when double stepping is required
* | |
* | +------------------------- ) 00 = 500 kbs data rate
* | )- 01 = 300 kbs data rate
* +----------------------------- ) 10 = 250 kbs data rate
* 11 = 1000 kbs data rate
*
*
* Outside the BIOS functions, the status is converted to a different
* format to be compatible with earlier releases of the BIOS
*
* +---+---+---+---+---+---+---+---+
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* +---+---+---+---+---+---+---+---+
* ^ ^ ^ ^ ^ ^ ^ ^
* | | | | | | | |
* | | | | | | | +- ) 000 = 360K in 360K undetermined
* | | | | | | | ) 001 = 360K in 1.2M undetermined
* | | | | | | | ) 010 = 1.2M in 1.2M undetermined
* | | | | | | +----- ) 011 = 360K in 360K media determined
* | | | | | | ) 100 = 360K in 1.2M media determined
* | | | | | | ) 101 = 1.2M in 1.2M media determined
* | | | | | | ) 110 = unused
* | | | | | +--------- ) 111 = drive invalid
* | | | | |
* | | | | +------------- unused
* | | | |
* | | | +----------------- set when media is determined
* | | |
* | | +--------------------- set when double stepping is required
* | |
* | +------------------------- ) 00 = 500 kbs data rate
* | )- 01 = 300 kbs data rate
* +----------------------------- ) 10 = 250 kbs data rate
* 11 = 1000 kbs data rate
*/
#define FDD_STATUS (BIOS_VAR_START + 0x90)
#define FS_MEDIA_DET (1 << 4)
#define FS_DOUBLE_STEP (1 << 5)
#define FS_360_IN_360 0x0
#define FS_360_IN_12 0x1
#define FS_12_IN_12 0x2
#define FS_288_IN_288 0x3
#define FS_DRIVE_SICK 0x7
#define media_determined(state) ((state & 3) + 3)
/*
* THE DRIVE TRACK: one byte each for drives A and B; records
* which track each drive last did a seek to
*
* FDD_CLONK_TRACK and FDD_JUDDER_TRACK are track numbers used
* in the determination of track capacity
*/
#define FDD_TRACK (BIOS_VAR_START + 0x94)
#define FDD_CLONK_TRACK 48
#define FDD_JUDDER_TRACK 10
/*
* DISKETTE PARAMETER TABLES: the disk pointer in the interrupt
* vector table addresses a table of floppy disk characteristics
* applying to the current drive and media; the entries in the
* table are referenced by offsets
*
* Standard parameter tables are established in the ROM for common
* media and drive types; these are referenced from a drive type
* table also in ROM
*/
#define DISK_POINTER_ADDR 0x78
#define DT_SPECIFY1 0 /* 1st FDC specify byte */
#define DT_SPECIFY2 1 /* 2nd FDC specify byte */
#define DT_MOTOR_WAIT 2 /* motor off wait time */
#define DT_N_FORMAT 3 /* bytes/sector indicator */
#define DT_LAST_SECTOR 4 /* sectors/track */
#define DT_GAP_LENGTH 5 /* gap length */
#define DT_DTL 6 /* data length */
#define DT_FORMAT_GAP_LENGTH 7 /* gap length for format */
#define DT_FORMAT_FILL_BYTE 8 /* fill byte for format */
#define DT_HEAD_SETTLE 9 /* head settle time/ms */
#define DT_MOTOR_START 10 /* motor start time/s */
#define DT_MAXIMUM_TRACK 11 /* maximum track number */
#define DT_DATA_TRANS_RATE 12 /* data transfer rate */
#define DT_SIZE_OLD 11 /* old table size */
#define DT_SIZE_NEW 13 /* new table size */
#define MOTOR_WAIT 0x25 /* standard motor off wait time */
#define DR_CNT 9 /* number of drive types */
#define DR_SIZE_OF_ENTRY (sizeof(half_word) + sizeof(word))
/* size of drive type entry */
#define DR_WRONG_MEDIA (1 << 7)/* set if "wrong" media for drive type */
/*
* SFD BIOS FLOPPY DISK EQUATES
*/
/*
* Drive intelligence level (returned by READ DASD TYPE function)
*/
#define DRIVE_IQ_UNKNOWN 0
#define DRIVE_IQ_NO_CHANGE_LINE 1
#define DRIVE_IQ_CHANGE_LINE 2
#define DRIVE_IQ_RESERVED 3
/*
* Maximum track accessible for drive types
*/
#define MAXIMUM_TRACK_ON_360 39
#define MAXIMUM_TRACK_ON_12 79
#define MAXIMUM_TRACK_ON_720 79
#define MAXIMUM_TRACK_ON_144 79
/*
* Media types
*/
#define MEDIA_TYPE_360_IN_360 1
#define MEDIA_TYPE_360_IN_12 2
#define MEDIA_TYPE_12_IN_12 3
#define MEDIA_TYPE_720_IN_720 4
#define MEDIA_TYPE_720_IN_144 5
#define MEDIA_TYPE_144_IN_144 6
/*
* Floppy disk controller status register formats
*/
#define ST0_UNIT_SELECT_0 (1 << 0)
#define ST0_UNIT_SELECT_1 (1 << 1)
#define ST0_HEAD_ADDRESS (1 << 2)
#define ST0_NOT_READY (1 << 3)
#define ST0_EQUIPMENT_CHECK (1 << 4)
#define ST0_SEEK_END (1 << 5)
#define ST0_INTERRUPT_CODE_0 (1 << 6)
#define ST0_INTERRUPT_CODE_1 (1 << 7)
#define ST1_MISSING_ADDRESS_MARK (1 << 0)
#define ST1_NOT_WRITEABLE (1 << 1)
#define ST1_NO_DATA (1 << 2)
#define ST1_UNUSED_AND_ALWAYS_0_0 (1 << 3)
#define ST1_OVERRUN (1 << 4)
#define ST1_DATA_ERROR (1 << 5)
#define ST1_UNUSED_AND_ALWAYS_0_1 (1 << 6)
#define ST1_END_OF_CYLINDER (1 << 7)
/*
* DMA adapter command codes
*/
#define BIOS_DMA_READ 0x46 /* == write to memory */
#define BIOS_DMA_WRITE 0x4A /* == read from memory */
#define BIOS_DMA_VERIFY 0x42 /* == verify against memory */
/*
* Number of floppy drives that can really be supported
*/
#if defined(NEC_98)
#define MAX_FLOPPY 0x1a
#else // !NEC_98
#define MAX_FLOPPY 0x02
#endif // !NEC_98
/*
* Special value of sectors transferred count
*/
#define IGNORE_SECTORS_TRANSFERRED -1
/*
* One second in motor time units (1/8 seconds)
*/
#define WAIT_A_SECOND 8
/*
* Minimum head settle times in milliseconds
*/
#define HEAD_SETTLE_360 20
#define HEAD_SETTLE_12 15
/*
* FDC settle time in microseconds
*/
#define FDC_SETTLE 45
/*
* Number of times to poll FDC for correct direction and controller
* ready before timing out
*/
#define FDC_TIME_OUT 10
/*
* SFD BIOS FLOPPY FUNCTION DEFINITIONS
*/
/*
* Primary external functions
*/
#ifdef ANSI
extern void diskette_io(void);
extern void diskette_int(void);
extern void diskette_post(void);
#else
extern void diskette_io();
extern void diskette_int();
extern void diskette_post();
#endif /* ANSI */
/*
* Secondary external functions
*/
#ifdef ANSI
extern void fl_disk_reset(int);
extern void fl_disk_status(int);
extern void fl_disk_read(int);
extern void fl_disk_write(int);
extern void fl_disk_verify(int);
extern void fl_disk_format(int);
extern void fl_fnc_err(int);
extern void fl_disk_parms(int);
extern void fl_disk_type(int);
extern void fl_disk_change(int);
extern void fl_format_set(int);
extern void fl_set_media(int);
extern void fl_diskette_setup(void);
#else
extern void fl_disk_reset();
extern void fl_disk_status();
extern void fl_disk_read();
extern void fl_disk_write();
extern void fl_disk_verify();
extern void fl_disk_format();
extern void fl_fnc_err();
extern void fl_disk_parms();
extern void fl_disk_type();
extern void fl_disk_change();
extern void fl_format_set();
extern void fl_set_media();
extern void fl_diskette_setup();
#endif /* ANSI */
/*
* Other external functions and data
*/
#ifdef ANSI
extern void drive_detect(int);
extern void translate_old(int);
extern void GetFormatParams(int *, int *, int *, int *);
#else
extern void drive_detect();
extern void translate_old();
extern void GetFormatParams();
#endif /* ANSI */
/*
* External functions in the host.
*/
#ifdef ANSI
extern void host_floppy_init(int, int);
extern void host_floppy_term(int, int);
extern void host_attach_floppies (void);
extern void host_detach_floppies (void);
extern void host_flip_real_floppy_ind (void);
#else
extern void host_floppy_init();
extern void host_floppy_term();
extern void host_attach_floppies ();
extern void host_detach_floppies ();
extern void host_flip_real_floppy_ind ();
#endif /* ANSI */
/*
* Secondary function jump table definitions
*/
#define FL_DISK_RESET 0x00
#define FL_DISK_STATUS 0x01
#define FL_DISK_READ 0x02
#define FL_DISK_WRITE 0x03
#define FL_DISK_VERF 0x04
#define FL_DISK_FORMAT 0x05
#define FL_DISK_PARMS 0x08
#define FL_FNC_ERR 0x14
#define FL_DISK_TYPE 0x15
#define FL_DISK_CHANGE 0x16
#define FL_FORMAT_SET 0x17
#define FL_SET_MEDIA 0x18
#define FL_JUMP_TABLE_SIZE 0x19
#define fl_operation_in_range(op) (op < FL_JUMP_TABLE_SIZE)
extern void ((*(fl_fnc_tab[]))());
#ifdef NTVDM
/*
* NT can't assume the presence and placings of SoftPC ROMs.
* These variables initialised from ntio.sys
*/
extern word int15_seg, int15_off;
extern word wait_int_seg, wait_int_off;
extern word dr_type_seg, dr_type_off;
extern sys_addr dr_type_addr;
#endif /* NTVDM */
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