Cross Reference: /src/sys/arch/mac68k/obio/iwm.s

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15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
34  * when there is simply no time for interrupt routine processing, 
45  *    The old status register content is stored on the stack.
55  *    so interrupt handling is left to the caller.
86 	 * e.g. ProDOS disks (there is a hook for such a table in .Sony).
242 	tstb	%a0@(mtrOff)		| ENABLE; make sure drive is off
252 	cmpib	#iwmMode,%d0		| all is well??
288  * iwmCheckDrive -- Check if given drive is available and return bit vector
292  * Returns:	%d0	Bit	 0 - 0 = Drive is single sided
294  *				 2 - 0 = Motor is running
295  *				 3 - 0 = Disk is write protected
296  *				 4 - 0 = Disk is DD
329 	moveq	#singleSided,%d0	| Drive is single-sided?
333 	 * Drive is double-sided -- this is not really a surprise as the
347 	moveq	#drvMotorState,%d0	| Motor is running?
352 	moveq	#writeProtected,%d0	| Disk is write protected?
357 	moveq	#diskIsHD,%d0		| Disk is HD? (was "drive installed")
544 	moveq	#stillStepping,%d0	| Drive is still stepping?
607 	moveq	#stillStepping, %d0	| Drive is still stepping?
630 	moveq	#0,%d2			| All is well
679 	 * Is this the right track & side? If not, return with error
711 	moveq	#0x03,%d4		| is 3 bytes long
754 	addb	%d7,%d3			| flag) is added with the next addx
802 	lslw	#3,%d1			| sizeof cylCacheSlot_t is 8 bytes
819 	addb	%d7,%d3			| flag) is added with the next addx
870 	bmi	rsBadCkSum		| Fault! ( > 0x3f is bad read)
910 	 * table is used for writing to disk, too.)
913 	moveq	#1,%d4			| Is two bytes long {1,0}
935 	lslw	#3,%d1			| sizeof cylCacheSlot_t is 8 bytes
993 	 * Is this the right track & side? If not, return with error
1014 	 * If the buffer is dirty ("valid"), write it to disk. If not, 
1022 	lslw	#3,%d1			| sizeof cylCacheSlot_t is 8 bytes
1030 	lslw	#3,%d1			| sizeof cylCacheSlot_t is 8 bytes
1040 	 * missing 'AD' is made up by piping 0x0B through the nibble 
1143 	 * between our teeth (%D1, that is).
1172 	 * Hopefully there is enough time for an additional check
1290 	/* TimeDBRA is ~8K for 040/33 machines, so we need nested loops */
1422 	moveq	#noNybErr,%d0		| Disk is blank?
1437 	moveq	#0x03,%d4		| is 3 bytes long
1486 	 * %d1/msb	bit 3 is side bit
1493 	moveq	#1,%d4			| is 2 bytes long
1505 	moveq	#0,%d0			| All is well
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