++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
				src/kernel/at_wini.c	 	 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

10100	/* This file contains the device dependent part of a driver for the IBM-AT
10101	 * winchester controller.
10102	 * It was written by Adri Koppes.
10103	 *
10104	 * The file contains one entry point:
10105	 *
10106	 *   at_winchester_task:        main entry when system is brought up
10111	 */

10273	/* Entry points to this driver. */
10274	PRIVATE struct driver w_dtab = {
10275	  w_name,               /* current device's name */
10276	  w_do_open,            /* open or mount request, initialize device */
10277	  w_do_close,           /* release device */
10278	  do_diocntl,           /* get or set a partition's geometry */
10279	  w_prepare,            /* prepare for I/O on a given minor device */
10280	  w_schedule,           /* precompute cylinder, head, sector, etc. */
10281	  w_finish,             /* do the I/O */
10282	  nop_cleanup,          /* nothing to clean up */
10283	  w_geometry,           /* tell the geometry of the disk */
10284	};

10291	/*===========================================================================*
10292	 *                              at_winchester_task                           *
10293	 *===========================================================================*/
10294	PUBLIC void at_winchester_task()
10295	{
10296	/* Set special disk parameters then call the generic main loop. */
10297	
10298	  init_params();
10299	
10300	  driver_task(&w_dtab);
10301	}

10412	/*===========================================================================*
10413	 *                              w_identify                                   *
10414	 *===========================================================================*/
10415	PRIVATE int w_identify()
10416	{
10417	/* Find out if a device exists, if it is an old AT disk, or a newer ATA
10418	 * drive, a removable media device, etc.
10419	 */

10439	  /* Looks OK; register IRQ and try an ATA identify command. */
10440	  put_irq_handler(wn->irq, w_handler);
10441	  enable_irq(wn->irq);

10504	  return(OK);
10505	}

10973	/*==========================================================================*
10974	 *                              w_handler                                   *
10975	 *==========================================================================*/
10976	PRIVATE int w_handler(irq)
10977	int irq;
10978	{
10979	/* Disk interrupt, send message to winchester task and reenable interrupts. */
10980	
10981	  w_status = in_byte(w_wn->base + REG_STATUS);  /* acknowledge interrupt */
10982	  interrupt(WINCHESTER);
10983	  return 1;
10984	}