;    File              : $RH.EQU$
;
;    Description       :
;
;    Original Author   : DIGITAL RESEARCH
;
;    Last Edited By    : $CALDERA$
;
;-----------------------------------------------------------------------;
;    Copyright Work of Caldera, Inc. All Rights Reserved.
;      
;    THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
;    PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
;    ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
;    WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
;    THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
;    HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
;    AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
;    AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
;    COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
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;    AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND
;    CIVIL LIABILITY.
;-----------------------------------------------------------------------;
;
;    *** Current Edit History ***
;    *** End of Current Edit History ***
;
;    $Log$
;
;    ENDLOG
;
;	Request command equates

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

;	Request header definition

RH_LEN		equ	byte ptr 0
RH_UNIT		equ	byte ptr 1
RH_CMD		equ	byte ptr 2
RH_STATUS	equ	word ptr 3
  RHS_DONE	equ	0100h
  RHS_BUSY	equ	0200h
  RHS_RM	equ	0800h
  RHS_ERROR	equ	8000h

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

;	Request header for media check

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


;	Request header for "build BPB"

RH2_MEDIA	equ	byte ptr 13	; BDOS or driver?
RH2_BUFFER	equ	dword ptr 14	; BDOS: scratch buffer for driver use
RH2_BPB		equ	dword ptr 18	; driver: address of new BPB


;	Request header for input/output

RH4_MEDIA	equ	byte ptr 13	; BDOS: current media byte
RH4_BUFFER	equ	dword ptr 14	; BDOS: disk transfer address
RH4_BUFOFF	equ	word ptr 14
RH4_BUFSEG	equ	word ptr 16
RH4_COUNT	equ	word ptr 18	; BDOS: sector count
RH4_SECTOR	equ	word ptr 22	; BDOS: starting sector
RH4_VOLID	equ	dword ptr 24	; driver: volume if illegal disk change

;	Request Header for Non-Destructive Input

RH5_CHAR	equ	byte ptr 13	; Character Read from Device

;	Request header for generic IOCTL

RH19_CATEGORY	equ	word ptr 13	; BDOS: major/minor function number
RH19_GENPB	equ	word ptr 19	; BDOS: extra parameters

;	Request header for get/set logical drive

RH24_DRIVE	equ	byte ptr 13	; Set logical drive

;	Request header lengths

RH0_LEN		equ	22
RH1_LEN		equ	15
RH2_LEN		equ	24
if DOS5
RH4_LEN		equ	30
else
RH4_LEN		equ	22		; or 24 for big sectors
endif
RH4_CDEV_LEN	equ	22
RH5_LEN		equ	14
RH12_LEN	equ	22
RH13_LEN	equ	13
RH14_LEN	equ	13
RH15_LEN	equ	13
RH19_LEN	equ	23
RH24_LEN	equ	21