[apple/xnu.git] / bsd / dev / i386 / mem.c

/*
 * Copyright (c) 2000-2004 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@
 */
/*-
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department, and code derived from software contributed to
 * Berkeley by William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from: Utah $Hdr: mem.c 1.13 89/10/08$
 *	@(#)mem.c	8.1 (Berkeley) 6/11/93
 */

#include <mach_load.h>

/*
 * Memory special file
 */

#include <sys/param.h>
#include <sys/dir.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/vm.h>
#include <sys/uio_internal.h>
#include <sys/malloc.h>

#include <mach/vm_types.h>
#include <mach/vm_param.h>
#include <vm/vm_kern.h>		/* for kernel_map */

extern addr64_t  kvtophys(vm_offset_t va); 
extern boolean_t kernacc(off_t, size_t );
extern int setup_kmem;

static caddr_t devzerobuf;

int mmread(dev_t dev, struct uio *uio);
int mmwrite(dev_t dev, struct uio *uio);
int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);

int
mmread(dev_t dev, struct uio *uio)
{

	return (mmrw(dev, uio, UIO_READ));
}

int
mmwrite(dev_t dev, struct uio *uio)
{

	return (mmrw(dev, uio, UIO_WRITE));
}

int
mmioctl(dev_t dev, u_long cmd, __unused caddr_t data, 
		__unused int flag, __unused struct proc *p)
{
	int minnum = minor(dev);

	if ((setup_kmem == 0) && ((minnum == 0) || (minnum == 1)))
		return(EINVAL);

	switch (cmd) {
	case FIONBIO:
	case FIOASYNC:
		/* OK to do nothing: we always return immediately */
		break;
	default:
		return ENODEV;
	}

	return (0);
}

int
mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
{
	register int o;
	register u_int c, v;
	int error = 0;
	vm_offset_t	where;
	vm_size_t size;


	while (uio_resid(uio) > 0 && error == 0) {
		uio_update(uio, 0);

		switch (minor(dev)) {

		/* minor device 0 is physical memory */
		case 0:
			if (setup_kmem == 0)
				return(ENODEV);

			v = trunc_page(uio->uio_offset);
			if (uio->uio_offset >= (off_t)mem_size)
				goto fault;

			size= PAGE_SIZE;
			if (kmem_alloc(kernel_map, &where, size) 
				!= KERN_SUCCESS) {
				goto fault;
			}
			o = uio->uio_offset - v;
			c = min(PAGE_SIZE - o, uio_curriovlen(uio));
			error = uiomove((caddr_t) (where + o), c, uio);
			kmem_free(kernel_map, where, PAGE_SIZE);
			continue;

		/* minor device 1 is kernel memory */
		case 1:
			if (setup_kmem == 0)
				return(ENODEV);
			/* Do some sanity checking */
			if (((vm_address_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) ||
				((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_AND_KEXT_ADDRESS))
				goto fault;
			c = uio_curriovlen(uio);
			if (!kernacc(uio->uio_offset, c))
				goto fault;
			error = uiomove((caddr_t)(uintptr_t)uio->uio_offset,
					(int)c, uio);
			continue;

		/* minor device 2 is EOF/RATHOLE */
		case 2:
			if (rw == UIO_READ)
				return (0);
			c = uio_curriovlen(uio);
			break;
		case 3:
			if(devzerobuf == NULL) {
				MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
				bzero(devzerobuf, PAGE_SIZE);
			}
			if(uio->uio_rw == UIO_WRITE) {
				c = uio_curriovlen(uio);
				break;
			}
 			c = min(uio_curriovlen(uio), PAGE_SIZE);
			error = uiomove(devzerobuf, (int)c, uio);
			continue;
		default:
			goto fault;
			break;
		}
			
		if (error)
			break;
		uio_update(uio, c);
	}
	return (error);
fault:
	return (EFAULT);
}


boolean_t
kernacc(
    off_t 	start,
    size_t	len
)
{
	off_t base;
	off_t end;
    
	base = trunc_page(start);
	end = start + len;
	
	while (base < end) {
	  if(kvtophys((vm_offset_t)base) == 0ULL)
			return(FALSE);
		base += page_size;
	}   

	return (TRUE);
}
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*-
	29	* Copyright (c) 1988 University of Utah.
	30	* Copyright (c) 1982, 1986, 1990, 1993
	31	* The Regents of the University of California. All rights reserved.
	32	*
	33	* This code is derived from software contributed to Berkeley by
	34	* the Systems Programming Group of the University of Utah Computer
	35	* Science Department, and code derived from software contributed to
	36	* Berkeley by William Jolitz.
	37	*
	38	* Redistribution and use in source and binary forms, with or without
	39	* modification, are permitted provided that the following conditions
	40	* are met:
	41	* 1. Redistributions of source code must retain the above copyright
	42	* notice, this list of conditions and the following disclaimer.
	43	* 2. Redistributions in binary form must reproduce the above copyright
	44	* notice, this list of conditions and the following disclaimer in the
	45	* documentation and/or other materials provided with the distribution.
	46	* 3. All advertising materials mentioning features or use of this software
	47	* must display the following acknowledgement:
	48	* This product includes software developed by the University of
	49	* California, Berkeley and its contributors.
	50	* 4. Neither the name of the University nor the names of its contributors
	51	* may be used to endorse or promote products derived from this software
	52	* without specific prior written permission.
	53	*
	54	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	55	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	56	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	57	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	58	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	59	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	60	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	61	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	62	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	63	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	64	* SUCH DAMAGE.
	65	*
	66	* from: Utah $Hdr: mem.c 1.13 89/10/08$
	67	* @(#)mem.c 8.1 (Berkeley) 6/11/93
	68	*/
	69
	70	#include <mach_load.h>
	71
	72	/*
	73	* Memory special file
	74	*/
	75
	76	#include <sys/param.h>
	77	#include <sys/dir.h>
	78	#include <sys/proc.h>
1c79356b	79	#include <sys/systm.h>
b0d623f7	80	#include <sys/conf.h>
1c79356b	81	#include <sys/vm.h>
91447636	82	#include <sys/uio_internal.h>
1c79356b A	83	#include <sys/malloc.h>
	84
	85	#include <mach/vm_types.h>
	86	#include <mach/vm_param.h>
	87	#include <vm/vm_kern.h> /* for kernel_map */
	88
0c530ab8	89	extern addr64_t kvtophys(vm_offset_t va);
91447636	90	extern boolean_t kernacc(off_t, size_t );
0c530ab8	91	extern int setup_kmem;
91447636	92
1c79356b A	93	static caddr_t devzerobuf;
1c79356b A	94
91447636 A	95	int mmread(dev_t dev, struct uio *uio);
	96	int mmwrite(dev_t dev, struct uio *uio);
	97	int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
	98	int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
	99
	100	int
	101	mmread(dev_t dev, struct uio *uio)
1c79356b A	102	{
	103
	104	return (mmrw(dev, uio, UIO_READ));
	105	}
	106
91447636 A	107	int
91447636 A	108	mmwrite(dev_t dev, struct uio *uio)
1c79356b A	109	{
	110
	111	return (mmrw(dev, uio, UIO_WRITE));
	112	}
	113
91447636	114	int
0c530ab8	115	mmioctl(dev_t dev, u_long cmd, __unused caddr_t data,
91447636 A	116	__unused int flag, __unused struct proc *p)
91447636 A	117	{
0c530ab8 A	118	int minnum = minor(dev);
	119
	120	if ((setup_kmem == 0) && ((minnum == 0) \|\| (minnum == 1)))
	121	return(EINVAL);
	122
91447636 A	123	switch (cmd) {
	124	case FIONBIO:
	125	case FIOASYNC:
	126	/* OK to do nothing: we always return immediately */
	127	break;
	128	default:
	129	return ENODEV;
	130	}
	131
	132	return (0);
	133	}
	134
	135	int
	136	mmrw(dev_t dev, struct uio *uio, enum uio_rw rw)
1c79356b A	137	{
	138	register int o;
	139	register u_int c, v;
1c79356b A	140	int error = 0;
1c79356b A	141	vm_offset_t where;
1c79356b	142	vm_size_t size;
1c79356b	143
0c530ab8	144
91447636	145	while (uio_resid(uio) > 0 && error == 0) {
b0d623f7 A	146	uio_update(uio, 0);
b0d623f7 A	147
1c79356b A	148	switch (minor(dev)) {
	149
	150	/* minor device 0 is physical memory */
	151	case 0:
0c530ab8 A	152	if (setup_kmem == 0)
	153	return(ENODEV);
	154
1c79356b	155	v = trunc_page(uio->uio_offset);
b0d623f7	156	if (uio->uio_offset >= (off_t)mem_size)
1c79356b A	157	goto fault;
	158
	159	size= PAGE_SIZE;
	160	if (kmem_alloc(kernel_map, &where, size)
	161	!= KERN_SUCCESS) {
	162	goto fault;
	163	}
	164	o = uio->uio_offset - v;
b0d623f7	165	c = min(PAGE_SIZE - o, uio_curriovlen(uio));
1c79356b A	166	error = uiomove((caddr_t) (where + o), c, uio);
	167	kmem_free(kernel_map, where, PAGE_SIZE);
	168	continue;
	169
	170	/* minor device 1 is kernel memory */
	171	case 1:
0c530ab8 A	172	if (setup_kmem == 0)
0c530ab8 A	173	return(ENODEV);
1c79356b A	174	/* Do some sanity checking */
1c79356b A	175	if (((vm_address_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) \|\|
b0d623f7	176	((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_AND_KEXT_ADDRESS))
1c79356b	177	goto fault;
b0d623f7	178	c = uio_curriovlen(uio);
1c79356b A	179	if (!kernacc(uio->uio_offset, c))
1c79356b A	180	goto fault;
91447636 A	181	error = uiomove((caddr_t)(uintptr_t)uio->uio_offset,
91447636 A	182	(int)c, uio);
1c79356b A	183	continue;
	184
	185	/* minor device 2 is EOF/RATHOLE */
	186	case 2:
	187	if (rw == UIO_READ)
	188	return (0);
b0d623f7	189	c = uio_curriovlen(uio);
1c79356b A	190	break;
	191	case 3:
	192	if(devzerobuf == NULL) {
	193	MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
	194	bzero(devzerobuf, PAGE_SIZE);
	195	}
	196	if(uio->uio_rw == UIO_WRITE) {
b0d623f7	197	c = uio_curriovlen(uio);
1c79356b A	198	break;
1c79356b A	199	}
b0d623f7	200	c = min(uio_curriovlen(uio), PAGE_SIZE);
1c79356b A	201	error = uiomove(devzerobuf, (int)c, uio);
	202	continue;
	203	default:
	204	goto fault;
	205	break;
	206	}
	207
	208	if (error)
	209	break;
b0d623f7	210	uio_update(uio, c);
1c79356b A	211	}
	212	return (error);
	213	fault:
	214	return (EFAULT);
	215	}
	216
	217
	218	boolean_t
	219	kernacc(
	220	off_t start,
	221	size_t len
	222	)
	223	{
	224	off_t base;
	225	off_t end;
	226
	227	base = trunc_page(start);
	228	end = start + len;
	229
	230	while (base < end) {
91447636	231	if(kvtophys((vm_offset_t)base) == 0ULL)
1c79356b A	232	return(FALSE);
	233	base += page_size;
	234	}
	235
	236	return (TRUE);
	237	}