DR-DOS-OpenDOS/IBMBIO/REQHDR.EQU

;    File              : $REQHDR.EQU$
;
;    Description       :
;
;    Original Author   : DIGITAL RESEARCH
;
;    Last Edited By    : $CALDERA$
;
;-----------------------------------------------------------------------;
;    Copyright Work of Caldera, Inc. All Rights Reserved.
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CMD_INIT		equ	 0	; Initialize the Device Driver
CMD_MEDIA_CHECK		equ	 1	; Request Media Check
CMD_BUILD_BPB		equ	 2	; Build Drive BPB
CMD_INPUT_IOCTL		equ	 3	; IOCTL input
CMD_INPUT		equ	 4	; Input
CMD_INPUT_NOWAIT	equ	 5	; Non destructive input no wait
CMD_INPUT_STATUS	equ	 6	; Input status
CMD_INPUT_FLUSH		equ	 7	; Input flush
CMD_OUTPUT		equ	 8	; Output
CMD_OUTPUT_VERIFY	equ	 9	; Output with verify
CMD_OUTPUT_STATUS	equ	10	; Output status
CMD_OUTPUT_FLUSH	equ	11	; Output flush
CMD_OUTPUT_IOCTL	equ	12	; IOCTL output
CMD_DEVICE_OPEN		equ	13	; Device OPEN
CMD_DEVICE_CLOSE	equ	14	; Device CLOSE
CMD_FIXED_MEDIA		equ	15	; Removeable Media Check
CMD_GENERIC_IOCTL	equ	19	; Generic IOCTL
CMD_GET_DEVICE		equ	23	; Get the Logical Device
CMD_SET_DEVICE		equ	24	; Set the Logical Device
CMD_QUERY_IOCTL		equ	25	; query ioctl support

;	Generic Request Header Format

RH_LEN		equ	es:byte ptr 0[bx]
RH_UNIT		equ	es:byte ptr 1[bx]
RH_CMD		equ	es:byte ptr 2[bx]
RH_STATUS	equ	es:word ptr 3[bx]
  RHS_DONE	equ	0100h
  RHS_BUSY	equ	0200h
  RHS_IC	equ	0400h			; Interim Character
  RHS_RM	equ	0800h
  RHS_ERROR	equ	8000h

;******
;* No longer safe to use - some device drivers trample on them....
;*
;* RH_STRATEGY	equ	es:dword ptr 5[bx]	; Device Strategy Routine
;* RH_STRATOFF	equ	es:word ptr  5[bx]	; Strategy Offset
;* RH_STRATSEG	equ	es:word ptr  7[bx]	; Strategy Segment
;* RH_INTERRUPT	equ	es:dword ptr 9[bx]	; Device Interrupt Routine
;* RH_INTOFF	equ	es:word ptr  9[bx]	; Intterupt Offset
;* RH_INTSEG	equ	es:word ptr 11[bx]	; Interrupt Segment
;*****

;	Request header for initialization

RH0_NUNITS	equ	es:byte ptr 13[bx]
RH0_RESIDENT	equ	es:word ptr 14[bx]
RH0_BPBOFF	equ	es:word ptr 18[bx]
RH0_BPBSEG	equ	es:word ptr 20[bx]
RH0_DRIVE	equ	es:byte ptr 22[bx]
RH0_LEN		equ	22

;	Request header for media check

RH1_MEDIA	equ	es:byte ptr 13[bx]	; BDOS: current media byte
RH1_RETURN	equ	es:byte ptr 14[bx]	; driver: return code (00, 01, FF)
RH1_VOLID	equ	es:dword ptr 15[bx]	; driver: volume label address
RH1_LEN		equ	15

;	Request header for "build BPB"

RH2_MEDIA	equ	es:byte ptr 13[bx]	; BDOS or driver?
RH2_BUFFER	equ	es:dword ptr 14[bx]	; BDOS: scratch buffer for driver use
RH2_BPB		equ	es:dword ptr 18[bx]	; same as the following:
RH2_BPBOFF	equ	es:word ptr 18[bx]	; driver: address of new BPB
RH2_BPBSEG	equ	es:word ptr 20[bx]
RH2_LEN		equ	24

;	Request header for input/output

RH4_MEDIA	equ	es:byte ptr 13[bx]	; BDOS: current media byte
RH4_RIC		equ	es:byte ptr 13[bx]	; BDOS: Return Interim Char flg
RH4_BUFFER	equ	es:dword ptr 14[bx]	; BDOS: disk transfer address
RH4_BUFOFF	equ	es:word ptr 14[bx]	; BDOS: Buffer Offset
RH4_BUFSEG	equ	es:word ptr 16[bx]	; BDOS: Buffer Segment
RH4_COUNT	equ	es:word ptr 18[bx]	; BDOS: sector count
RH4_SECTOR	equ	es:word ptr 20[bx]	; BDOS: starting sector
RH4_VOLID	equ	es:dword ptr 22[bx]	; driver: volume if illegal disk change
RH4_BIGSECTOR   equ es:dword ptr 26[bx] 
RH4_BIGSECTORLO	equ	es:word ptr 26[bx]
RH4_BIGSECTORHI	equ	es:word ptr 28[bx]

RH4_LEN		equ	30

;	Request Header for Non-Destructive Input

RH5_CHAR	equ	es:byte ptr 13[bx]	; Character Read from Device
RH5_RIC		equ	es:byte ptr 13[bx]	; BDOS: Return Interim Char flg
RH5_LEN		equ	14

;	Request Header for Device Open

RH13_LEN	equ	13

;	Request Header for Device Close

RH14_LEN	equ	13

;	Request header for generic IOCTL

RH19_CATEGORY	equ	es:word ptr 13[bx]	; BDOS: major/minor function number
RH19_MAJOR	equ	es:byte ptr 13[bx]	; BDOS: Major Function Number
RH19_MINOR	equ	es:byte ptr 14[bx]	; BDOS: Minor Function Number
RH19_SI		equ	es:word ptr 15[bx]	; BDOS: User SI	
RH19_DI		equ	es:word ptr 17[bx]	; BDOS: User DI	
RH19_GENPB	equ	es:dword ptr 19[bx]	; BDOS: extra parameters
RH19_LEN	equ	23

RQ19_SET	equ	40h		; set device parameters
RQ19_GET	equ	60h		; get device parameters
RQ19_WRITE	equ	41h		; write tracks
RQ19_READ	equ	61h		; read tracks
RQ19_FORMAT	equ	42h		; format tracks
RQ19_VERIFY	equ	62h		; verify tracks

RQ19_PRP_START	equ	4Ch		; start of codepage prepare
RQ19_PRP_END	equ	4Dh		; end of codepage prepare
RQ19_SELECT	equ	4Ah		; select code page
RQ19_QRY_SEL	equ	6Ah		; query selected code page
RQ19_QRY_PRP	equ	6Bh		; query prepared code page(s)
RQ19_DSP_SET	equ	5Fh		; set display information
RQ19_DSP_GET	equ	7Fh		; get display information

;	Request header for get/set drive

RH24_CMD	equ	es:byte ptr 14[bx]	; BDOS: Command Code
RH24_STATUS	equ	es:word ptr 15[bx]	; BDOS: Status
RH24_RESVD	equ	es:dword ptr 17[bx]	; BDOS: Reserved
RH24_LEN	equ	21

RH_SIZE		equ	30		; maximum size of request header