IFND	EXEC_IO_I
EXEC_IO_I	EQU	1
**
**	$Filename: exec/io.i $
**	$Release: 1.3 $
**
**	
**
**	(C) Copyright 1985,1986,1987,1988 Commodore-Amiga, Inc.
**	    All Rights Reserved
**

	IFND	EXEC_PORTS_I
	INCLUDE	"exec/ports.i"
	ENDC	; EXEC_PORTS_I

	IFND	EXEC_LIBRARIES_I
	INCLUDE	"exec/libraries.i"
	ENDC	; EXEC_LIBRARIES_I


*----------------------------------------------------------------
*
*   IO Request Structures
*
*----------------------------------------------------------------

*------ Required portion of IO request:

	STRUCTURE	IO,MN_SIZE
	APTR	IO_DEVICE			* device node pointer
	APTR	IO_UNIT			* unit (driver private)
	UWORD	IO_COMMAND			* device command
	UBYTE	IO_FLAGS			* special flags
	BYTE	IO_ERROR			* error or warning code
	LABEL	IO_SIZE


*------ Standard IO request extension:

	ULONG	IO_ACTUAL			* actual # of bytes transfered
	ULONG	IO_LENGTH			* requested # of bytes transfered
	APTR	IO_DATA			* pointer to data area
	ULONG	IO_OFFSET			* offset for seeking devices
	LABEL	IOSTD_SIZE


*------ IO_FLAGS bit definitions:

	BITDEF	IO,QUICK,0			* complete IO quickly


*----------------------------------------------------------------
*
*   Standard Device Library Functions
*
*----------------------------------------------------------------

	LIBINIT

	LIBDEF	DEV_BEGINIO		* process IO request
	LIBDEF	DEV_ABORTIO		* abort IO request


*----------------------------------------------------------------
*
*   IO Function Macros
*
*----------------------------------------------------------------

BEGINIO	MACRO
	LINKLIB	DEV_BEGINIO,(IO_DEVICE,a1)
	ENDM

ABORTIO	MACRO
	LINKLIB	DEV_ABORTIO,(IO_DEVICE,a1)
	ENDM


*----------------------------------------------------------------
*
*   Standard Device Command Definitions
*
*----------------------------------------------------------------

*------ Command definition macro:
DEVINIT	MACRO	; [baseOffset]
	IFC	'\1',''
CMD_COUNT	SET	CMD_NONSTD
	ENDC
	IFNC	'\1',''
CMD_COUNT	SET	\1
	ENDC
	ENDM

DEVCMD	MACRO	; cmdname
\1	EQU	CMD_COUNT
CMD_COUNT	SET	CMD_COUNT+1
	ENDM


*------ Standard device commands:

	DEVINIT	0

	DEVCMD	CMD_INVALID		* invalid command
	DEVCMD	CMD_RESET		* reset as if just inited
	DEVCMD	CMD_READ		* standard read
	DEVCMD	CMD_WRITE		* standard write
	DEVCMD	CMD_UPDATE		* write out all buffers
	DEVCMD	CMD_CLEAR		* clear all buffers
	DEVCMD	CMD_STOP		* hold current and queued
	DEVCMD	CMD_START		* restart after stop
	DEVCMD	CMD_FLUSH		* abort entire queue


*------ First non-standard device command value:

	DEVCMD	CMD_NONSTD

	ENDC	; EXEC_IO_I