245 lines
10 KiB
C
245 lines
10 KiB
C
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//
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// This code is temporary. When Insignia supplies rom support, it should
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// be removed.
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//
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/* x86 v1.0
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*
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* XBIOSDSK.H
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* Guest ROM BIOS disk emulation
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*
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* History
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* Created 20-Oct-90 by Jeff Parsons
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* 17-Apr-91 Trimmed by Dave Hastings for use in temp. softpc
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*
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* COPYRIGHT NOTICE
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* This source file may not be distributed, modified or incorporated into
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* another product without prior approval from the author, Jeff Parsons.
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* This file may be copied to designated servers and machines authorized to
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* access those servers, but that does not imply any form of approval.
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*/
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#define MAX_FD 2 // # supported floppy drives
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#define MAX_HD 2 // # supported hard disk drives
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#define MAX_DRIVES (MAX_FD+MAX_HD)
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#define DRIVE_FD0 0x00 // first floppy disk drive #
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#define DRIVE_FD1 0x01 //
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#define DRIVE_HD0 0x80 // first hard disk drive #
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#define DRIVE_HD1 0x81 //
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/* Drive types for QUERYDRVPARMS
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*/
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#define DRVTYPE_360KB 1
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#define DRVTYPE_1200KB 2
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#define DRVTYPE_720KB 3
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#define DRVTYPE_1440KB 4
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/* BIOS disk functions
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*/
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#define DSKFUNC_DISKRESET 0x00
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#define DSKFUNC_DISKSTATUS 0x01
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#define DSKFUNC_READSECTORS 0x02
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#define DSKFUNC_WRITESECTORS 0x03
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#define DSKFUNC_VERIFYSECTORS 0x04
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#define DSKFUNC_FORMATTRACK 0x05
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#define DSKFUNC_QUERYDRVPARMS 0x08
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#define DSKFUNC_QUERYDASDTYPE 0x15
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#define DSKFUNC_QUERYCHANGE 0x16
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#define DSKFUNC_SETDISKTYPE 0x17
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#define DSKFUNC_SETMEDIATYPE 0x18
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/* BIOS disk status codes
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*/
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#define DSKSTAT_SUCCESS 0x00 // successful completion
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#define DSKSTAT_BADCMD 0x01 // bad command
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#define DSKSTAT_BADADDRMARK 0x02 // address mark not found
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#define DSKSTAT_WRITEPROTECT 0x03 // write on write-protected disk
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#define DSKSTAT_RECNOTFOUND 0x04 // sector not found
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#define DSKSTAT_BADRESET 0x05 // reset failed (HD)
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#define DSKSTAT_MEDIACHANGE 0x06 // media changed
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#define DSKSTAT_INITFAIL 0x07 // parm. act. failed (HD)
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#define DSKSTAT_BADDMA 0x08 // DMA overrun
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#define DSKSTAT_DMABOUNDARY 0x09 // DMA across 64K boundary
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#define DSKSTAT_BADSECTOR 0x0A // bad sector detected (HD)
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#define DSKSTAT_BADTRACK 0x0B // bad track detected (HD)
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#define DSKSTAT_BADMEDIATYPE 0x0C // unsupported track (HD)
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#define DSKSTAT_BADFMTSECNUM 0x0D // bad # of sectors on format (HD)
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#define DSKSTAT_ADDRMARKDET 0x0E // ctrl data addr mark detected (HD
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#define DSKSTAT_DMAARBERR 0x0F // DMA arbitration error (HD)
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#define DSKSTAT_BADCRCECC 0x10 // bad CRC/ECC
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#define DSKSTAT_DATACORRECT 0x11 // data ECC corrected
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#define DSKSTAT_BADCNTLR 0x20 // controller failure
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#define DSKSTAT_BADSEEK 0x40 // seek failed
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#define DSKSTAT_TIMEOUT 0x80 // time out
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#define DSKSTAT_DRVNOTREADY 0xAA // drive not ready (HD)
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#define DSKSTAT_UNDEFERR 0xBB // undefined error (HD)
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#define DSKSTAT_WRITEFAULT 0xCC // write fault (HD)
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#define DSKSTAT_STATUSERROR 0xE0 // status register error (HD)
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#define DSKSTAT_SENSEFAIL 0xFF // sense operation failed (HD)
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/* BIOS Data Area disk locations
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*/
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#define DSKDATA_SEEKSTATUS 0x43E // drive recal. status (1 byte)
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#define DSKDATA_MOTORSTATUS 0x43F // motor status (1 byte)
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#define DSKDATA_MOTORCOUNT 0x440 // time-out count for motor (1 byte)
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#define DSKDATA_DISKETTESTATUS 0x441 // return code status (1 byte)
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#define DSKDATA_NECSTATUS 0x442 // controller status bytes (7 bytes)
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#define DSKDATA_DISKSTATUS1 0x474 // return code status (1 byte)
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/* Floppy Diskette Parameter Table
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* (pointed by vector BIOSINT_FDSKPARMS (1Eh))
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*/
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typedef struct fdp_s {
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BYTE bSpecify1; // step-rate, head-unload
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BYTE bSpecify2; // head-load, DMA mode
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BYTE bMotorOff; // motor-off delay
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BYTE bSectorSize; // bytes/sec (0=128,1=256,2=512,3=1024)
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BYTE nLastSector; // (or think of it as # sectors/track)
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BYTE lenGapRW; //
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BYTE lenData; //
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BYTE lenGapFormat; //
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BYTE bFormatData; // format initialization byte
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BYTE bSettle; // head settle time
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BYTE bMotorOn; // motor start-up time
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} FDP;
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typedef FDP *PFDP; // pointer to diskette parameter table
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/* Hard Disk Parameter Table
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*/
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typedef struct hdp_s {
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USHORT usMaxCylinders; // maximum number of cylinders
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BYTE bMaxHeads; // maximum number of heads
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USHORT usReserve1; // reserved (not used)
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USHORT usWritePrecompCyl; // starting write precompensation cyl.
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BYTE bMaxECCDataBurstLen; // maximum ECC data burst length
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BYTE bControl; // control byte
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BYTE abReserve2[3]; // reserved (not used)
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USHORT usLandingZone; // landing zone for head parking
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BYTE bSectorsPerTrack; // number of sectors per track
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BYTE bReserve3; // reserved for future use
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} HDP;
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typedef HDP *PHDP; // pointer to hard disk parameter table
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/* Hard Disk Parameter Table control byte bit definitions
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*/
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#define HDPCTRL_DISABLERETRY 0xC0 // disable retries
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#define HDPCTRL_EXCEED8HEADS 0x08 // more than 8 heads
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/* Boot sector structures (more DOS-defined than BIOS-defined however -JTP)
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*/
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#define PARTITION_ACTIVE 0x80 // status values
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#define PARTITION_12BITFAT 1 // type valus
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#define PARTITION_16BITFAT 4
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#define PARTITION_LARGEFAT 6
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typedef struct mbr_s { // Master Boot Record
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BYTE boot_code[0x1BE];
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BYTE partition_status;
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BYTE starting_head;
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USHORT starting_sec_cyl;
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BYTE partition_type;
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BYTE ending_head;
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USHORT ending_sec_cyl;
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ULONG starting_abs_sector;
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ULONG total_sectors;
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} MBR;
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typedef MBR *PMBR;
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typedef struct bpb_s { // BIOS Parameter Block (from sysbloks.h)
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BYTE boot_code[0x0B];
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USHORT bytes_per_sector; // sector size
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BYTE sectors_per_cluster; // sectors per allocation unit
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USHORT reserved_sectors; // number of reserved sectors
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BYTE nbr_fats; // number of fats
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USHORT root_entries; // number of directory entries
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USHORT total_sectors; // number of sectors
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BYTE media_type; // fatid byte
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USHORT sectors_per_fat; // sectors in a copy of the FAT
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USHORT sectors_per_track; // number of sectors per track
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USHORT number_of_heads; // number of heads
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ULONG hidden_sectors; // number of hidden sectors
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ULONG large_total_sectors; // large total sectors
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BYTE reserved[6]; // 6 reserved bytes
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} BPB;
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typedef BPB *PBPB;
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/* Virtual disk mapping info
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*
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* VIRTDISK is the header of a virtual disk file. Following the header
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* is an optional track table, and TRACKINFO is the format of each entry
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* in that table. The track table is only present if the last two
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* fields in the header (nsecTrack and nbSector) are zero, indicating a
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* non-homogeneous disk structure.
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*
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* Currently, a max of 4 DRIVEMAP structures are supported. The first two
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* entries are for physical drives 0 and 1 (specified in the command-line
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* options as drives A: and B:), and subsequent entries are for physical
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* hard drives 0x80 and up (specified as drives C: and up). Each DRIVEMAP
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* describes the remapping that should occur, if any, and for virtual disk
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* files, it also contains the virtual disk file header (which is read in
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* during initialization).
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*
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* When a request comes in for one of those drives, we check the flags in
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* corresponding DRIVEMAP structure. If no flags are set, no remapping
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* or virtualization occurs (drive behaves normally). This is the default.
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* If the drive is disabled (eg, "A:=*"), then all requests are returned
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* with an error. If the drive is remapped to another physical drive (eg,
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* "A:=B:") then the request is routed to the mapped drive. Finally, if
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* the drive is remapped to a virtual disk file, the appropriate file I/O
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* is performed.
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*
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* NOTE: Contrary to comments above, access to physical drives is not
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* currently supported, so mapping to a virtual drive is all you can do
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* right now.... (24-Nov-90 JTP)
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*/
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#define VDFLAGS_WRITEPROTECT 0x01 // virtual disk is "write-protected"
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typedef struct virtdisk_s {
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BYTE fbVirt; // flags
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BYTE nHeads; // # heads
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USHORT nCyls; // # cylinders
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USHORT nsecTrack; // # sectors per track
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USHORT nbSector; // # bytes per sector
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} VIRTDISK;
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typedef VIRTDISK *PVIRTDISK;
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typedef struct trackinfo_s {
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USHORT nsecTrack; // # sectors per track
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USHORT nbSector; // # bytes per sector
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ULONG offVirtDisk; // offset within virtual disk file
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} TRACKINFO;
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typedef TRACKINFO *PTRACKINFO;
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#define DMFLAGS_VIRTUAL 0x01 // physical remapped to virtual
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#define DMFLAGS_DISABLED 0x02 // physical remapped to disabled
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#define DMFLAGS_PHYSICAL 0x04 // physical remapped to physical
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#define DMFLAGS_LOGICAL 0x08 // physical remapped to logical
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typedef struct drivemap_s {
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BYTE fbMap; // flags
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BYTE iPhysical; // # of remapped drive, if any
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FILE *hfVirtDisk; // handle to virtual disk, if any
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VIRTDISK vdInfo; // virtual disk info, if any
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#ifdef LOGICAL_DRIVE_SUPPORT
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ULONG nsecHidden; // from BPB, if any (logical disks only)
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BYTE type; // disk type, if any (logical disks only)
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#endif
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} DRIVEMAP;
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typedef DRIVEMAP *PDRIVEMAP;
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