?? device.h
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#define BPB_MDESC 10
#define BPB_NFSECT 11
#define BPB_NSECS 13
#define BPB_NHEADS 15
#define BPB_HIDDEN 17
#define BPB_HUGE 21
#define BPB_SIZEOF 25
typedef struct
{
UWORD bpb_nbyte; /* Bytes per Sector */
UBYTE bpb_nsector; /* Sectors per Allocation Unit */
UWORD bpb_nreserved; /* # Reserved Sectors */
UBYTE bpb_nfat; /* # FAT's */
UWORD bpb_ndirent; /* # Root Directory entries */
UWORD bpb_nsize; /* Size in sectors */
UBYTE bpb_mdesc; /* MEDIA Descriptor Byte */
UWORD bpb_nfsect; /* FAT size in sectors */
UWORD bpb_nsecs; /* Sectors per track */
UWORD bpb_nheads; /* Number of heads */
ULONG bpb_hidden; /* Hidden sectors */
ULONG bpb_huge; /* Size in sectors if */
/* bpb_nsize== 0 */
} bpb;
/* */
/* Boot Block (Super Block) */
/* */
/* See BPB comments for the offsets below */
/* */
#define BT_JUMP 0
#define BT_OEM 3
#define BT_BPB 11
#define BT_SIZEOF 36
typedef struct
{
BYTE bt_jump[3]; /* Boot Jump opcodes */
BYTE bt_oem[8]; /* OEM Name */
bpb bt_bpb; /* BPB for this media/device */
WORD bt_nsecs; /* # Sectors per Track */
WORD bt_nheads; /* # Heads */
WORD bt_hidden; /* # Hidden sectors */
LONG bt_huge; /* use if nsecs == 0 */
} boot;
typedef boot super; /* Alias for boot structure */
typedef struct
{
BYTE r_length; /* Request Header length */
BYTE r_unit; /* Unit Code */
BYTE r_command; /* Command Code */
WORD r_status; /* Status */
BYTE r_reserved[8]; /* DOS Reserved Area */
union
{
struct
{
BYTE _r_nunits; /* number of units */
BYTE FAR
*_r_endaddr; /* Ending Address */
bpb /* ptr to BPB array */
* FAR *_r_bpbptr;
BYTE _r_firstunit;
} _r_init;
struct
{
BYTE _r_meddesc; /* MEDIA Descriptor */
BYTE _r_retcode; /* Return Code */
BYTE FAR
*_r_vid; /* volume id */
} _r_media;
struct
{
BYTE _r_meddesc; /* MEDIA Descriptor */
boot FAR
*_r_fat; /* boot sector pointer */
bpb FAR
*_r_bpbpt; /* ptr to BPB table */
} _r_bpb;
struct
{
BYTE _r_meddesc; /* MEDIA Descriptor */
BYTE FAR
*_r_trans; /* Transfer Address */
UWORD _r_count; /* Byte/Sector Count */
UWORD _r_start; /* Starting Sector No. */
BYTE FAR
*_r_vid; /* Pointer to volume id */
LONG _r_huge; /* for > 32Mb drives */
} _r_rw;
struct
{
BYTE _r_ndbyte; /* Byte Read From Device */
} _r_nd;
} _r_x;
} request;
#define HUGECOUNT 0xffff
#define MAXSHORT 0xffffl
/*
* Macros to assist request structure legibility
*/
/* Init packet macros */
#define r_nunits _r_x._r_init._r_nunits
#define r_endaddr _r_x._r_init._r_endaddr
#define r_bpbptr _r_x._r_init._r_bpbptr
#define r_firstunit _r_x._r_init._r_firstunit
/* MEDIA Check packet macros */
#define r_mcmdesc _r_x._r_media._r_meddesc
#define r_mcretcode _r_x._r_media._r_retcode
#define r_mcvid _r_x._r_media._r_vid
/* Build BPB packet macros */
#define r_bpmdesc _r_x._r_bpb._r_meddesc
#define r_bpfat _r_x._r_bpb._r_fat
#define r_bpptr _r_x._r_bpb._r_bpbpt
/* rw packet macros */
#define r_meddesc _r_x._r_rw._r_meddesc
#define r_trans _r_x._r_rw._r_trans
#define r_count _r_x._r_rw._r_count
#define r_start _r_x._r_rw._r_start
#define r_rwvid _r_x._r_rw._r_vid
#define r_huge _r_x._r_rw._r_huge
/* ndread packet macros */
#define r_ndbyte _r_x._r_nd._r_ndbyte
/*
*interrupt support (spl & splx) support - IBM style
*/
#define I_NONE 0 /* Initial value */
/* predefined interrupt levels - 8259 support */
#define IRQ0 0x01 /* Level 0 - highest */
#define IRQ1 0x02
#define IRQ2 0x04
#define IRQ3 0x08
#define IRQ4 0x10
#define IRQ5 0x20
#define IRQ6 0x40
#define IRQ7 0x80 /* Level 7 - lowest */
/* standard hardware configuration */
#define I_RTC IRQ0 /* Timer */
#define I_KBD IRQ1 /* Keyboard */
#define I_COM2 IRQ3 /* COM1: */
#define I_COM1 IRQ4 /* COM2: */
#define I_HDC IRQ5 /* Fixed disk */
#define I_FDC IRQ6 /* Diskette */
#define I_PRT IRQ7 /* Printer */
/* standard hardware vectors - 8259 defined */
#define V_RTC 0x08 /* Timer */
#define V_KBD 0x09 /* Keyboard */
#define V_LEV2 0x0a /* Level 2 - uncomitted */
#define V_COM2 0x0b /* COM1: */
#define V_COM1 0x0c /* COM2: */
#define V_HDC 0x0d /* Fixed disk */
#define V_FDC 0x0e /* Diskette */
#define V_PRT 0x0f /* Printer */
#define V_LEV0 0x08 /* Level 0 - highest */
#define V_LEV1 0x09
#define V_LEV2 0x0a /* Level 2 - uncomitted */
#define V_LEV3 0x0b
#define V_LEV4 0x0c
#define V_LEV5 0x0d
#define V_LEV6 0x0e
#define V_LEV7 0x0f /* Level 7 - lowest */
/*
*/
typedef request FAR *rqptr;
typedef bpb FAR *bpbptr;
typedef BYTE FAR *byteptr;
typedef struct dhdr FAR *dhdrptr;
/*
* externals
*/
extern BYTE FAR *device_end();
/*
* end of device.h
*/
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