hw_iobus.c

这个是LINUX下的GDB调度工具的源码

/*  This file is part of the program psim.

    Copyright (C) 1994-1996, Andrew Cagney <[e-mail]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
    */


#ifndef _HW_IOBUS_C_
#define _HW_IOBUS_C_

#ifndef STATIC_INLINE_HW_IOBUS
#define STATIC_INLINE_HW_IOBUS STATIC_INLINE
#endif

#include "device_table.h"


/* DEVICE

   iobus - simple bus for attaching devices

   DESCRIPTION

   IOBUS provides a simple `local' bus for attaching (hanging)
   programmed IO devices from.  All child devices are directly mapped
   into this devices parent address space (after checking that the
   attach address lies within the <<iobus>> address range.  address).

   PROPERTIES

   None.

   */

static void
hw_iobus_attach_address_callback(device *me,
				 attach_type type,
				 int space,
				 unsigned_word addr,
				 unsigned nr_bytes,
				 access_type access,
				 device *client) /*callback/default*/
{
  int attach_space;
  unsigned_word attach_address;
  /* sanity check */
  if (space != 0)
    device_error(me, "invalid space (%d) specified by %s",
		 space, device_path(client));
  /* get the bus address */
  device_address_to_attach_address(device_parent(me),
				   device_unit_address(me),
				   &attach_space,
				   &attach_address,
				   me);
  if (addr < attach_address)
    device_error(me, "Invalid attach address 0x%lx", (unsigned long)addr);
  device_attach_address(device_parent(me),
			type,
			attach_space,
			addr,
			nr_bytes,
			access,
			client);
}


static device_callbacks const hw_iobus_callbacks = {
  { NULL, },
  { hw_iobus_attach_address_callback, },
  { NULL, }, /* IO */
  { NULL, }, /* DMA */
  { NULL, }, /* interrupt */
  { generic_device_unit_decode,
    generic_device_unit_encode,
    generic_device_address_to_attach_address,
    generic_device_size_to_attach_size }
};


const device_descriptor hw_iobus_device_descriptor[] = {
  { "iobus", NULL, &hw_iobus_callbacks },
  { NULL, },
};

#endif /* _HW_IOBUS_ */