[apple/xnu.git] / osfmk / i386 / io_emulate.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */

#include <platforms.h>
#include <mach/boolean.h>
#include <mach/port.h>
#include <kern/thread.h>
#include <kern/task.h>

#include <ipc/ipc_port.h>
#include <ipc/ipc_space.h>
#include <ipc/ipc_right.h>
#include <ipc/ipc_object.h>
#include <ipc/ipc_entry.h>

#include <i386/thread.h>
#include <i386/io_port.h>
#include <i386/io_emulate.h>
#include <i386/iopb_entries.h>

#if 1
int
emulate_io(
	__unused struct i386_saved_state	*regs,
	__unused int				opcode,
	__unused int				io_port)
{
	/* At the moment, we are not allowing I/O emulation 
	 *
 	 * FIXME - this should probably change due to 
	 * the Window Server's need to map I/O ports into its space.
	 */

	return EM_IO_ERROR;
}
#else
int
emulate_io(
	struct i386_saved_state	*regs,
	int			opcode,
	int			io_port)
{
	thread_t	thread = current_thread();
	at386_io_lock_state();

	if (iopl_emulate(regs, opcode, io_port))
	    return EM_IO_DONE;

	if (iopb_check_mapping(thread, iopl_device))
	    return EM_IO_ERROR;

	/*
	 *	Check for send rights to the IOPL device port.
	 */
	if (iopl_device_port == IP_NULL)
	    return EM_IO_ERROR;
	{
	    ipc_space_t	space = current_space();
	    mach_port_name_t	name;
	    ipc_entry_t	entry;
	    boolean_t	has_rights = FALSE;
	    ipc_entry_bits_t *capability;

	    is_write_lock(space);
	    assert(space->is_active);

	    if (ipc_right_reverse(space, (ipc_object_t) iopl_device_port,
				  &name, &entry, &capability)) {
		/* iopl_device_port is locked and active */
		if (capability[space->server_id] & MACH_PORT_TYPE_SEND)
		    has_rights = TRUE;
		ip_unlock(iopl_device_port);
	    }

	    is_write_unlock(space);
	    if (!has_rights) {
		return EM_IO_ERROR;
	    }
	}

	/*
	 * Map the IOPL port set into the thread.
	 */

	if (i386_io_port_add(thread, iopl_device)
	    != KERN_SUCCESS) 
		return EM_IO_ERROR;

	/*
	 * Make the thread use its IO_TSS to get the IO permissions;
	 * it may not have had one before this.
	 */
	act_machine_switch_pcb(thread);

	return EM_IO_RETRY;
}
#endif
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56	/*
	57	*/
	58
	59	#include <platforms.h>
1c79356b A	60	#include <mach/boolean.h>
	61	#include <mach/port.h>
	62	#include <kern/thread.h>
	63	#include <kern/task.h>
	64
	65	#include <ipc/ipc_port.h>
	66	#include <ipc/ipc_space.h>
	67	#include <ipc/ipc_right.h>
	68	#include <ipc/ipc_object.h>
	69	#include <ipc/ipc_entry.h>
	70
	71	#include <i386/thread.h>
	72	#include <i386/io_port.h>
	73	#include <i386/io_emulate.h>
	74	#include <i386/iopb_entries.h>
	75
91447636	76	#if 1
1c79356b A	77	int
1c79356b A	78	emulate_io(
8f6c56a5	79	__unused struct i386_saved_state *regs,
91447636 A	80	__unused int opcode,
91447636 A	81	__unused int io_port)
1c79356b	82	{
1c79356b A	83	/* At the moment, we are not allowing I/O emulation
	84	*
	85	* FIXME - this should probably change due to
	86	* the Window Server's need to map I/O ports into its space.
	87	*/
	88
	89	return EM_IO_ERROR;
91447636	90	}
1c79356b	91	#else
91447636 A	92	int
	93	emulate_io(
	94	struct i386_saved_state *regs,
	95	int opcode,
	96	int io_port)
	97	{
1c79356b A	98	thread_t thread = current_thread();
	99	at386_io_lock_state();
	100
	101	if (iopl_emulate(regs, opcode, io_port))
	102	return EM_IO_DONE;
	103
	104	if (iopb_check_mapping(thread, iopl_device))
	105	return EM_IO_ERROR;
	106
	107	/*
	108	* Check for send rights to the IOPL device port.
	109	*/
	110	if (iopl_device_port == IP_NULL)
	111	return EM_IO_ERROR;
	112	{
	113	ipc_space_t space = current_space();
	114	mach_port_name_t name;
	115	ipc_entry_t entry;
	116	boolean_t has_rights = FALSE;
	117	ipc_entry_bits_t *capability;
	118
	119	is_write_lock(space);
	120	assert(space->is_active);
	121
	122	if (ipc_right_reverse(space, (ipc_object_t) iopl_device_port,
	123	&name, &entry, &capability)) {
	124	/* iopl_device_port is locked and active */
	125	if (capability[space->server_id] & MACH_PORT_TYPE_SEND)
	126	has_rights = TRUE;
	127	ip_unlock(iopl_device_port);
	128	}
	129
	130	is_write_unlock(space);
	131	if (!has_rights) {
	132	return EM_IO_ERROR;
	133	}
	134	}
	135
	136	/*
	137	* Map the IOPL port set into the thread.
	138	*/
	139
	140	if (i386_io_port_add(thread, iopl_device)
	141	!= KERN_SUCCESS)
	142	return EM_IO_ERROR;
	143
	144	/*
	145	* Make the thread use its IO_TSS to get the IO permissions;
	146	* it may not have had one before this.
	147	*/
91447636	148	act_machine_switch_pcb(thread);
1c79356b A	149
1c79356b A	150	return EM_IO_RETRY;
1c79356b	151	}
91447636	152	#endif