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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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/buf.h>
#include <sys/systm.h>
#include <sys/vm.h>
#include <sys/uio.h>
#include <sys/malloc.h>

#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <mach/vm_param.h>

#include <ppc/Diagnostics.h>
#include <ppc/mappings.h>

static caddr_t devzerobuf;

extern vm_offset_t mem_actual;
extern pmap_t kernel_pmap;

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

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

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

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

mmrw(dev, uio, rw)
	dev_t dev;
	struct uio *uio;
	enum uio_rw rw;
{
	register int o;
	register u_int c, v;
	register struct iovec *iov;
	int error = 0;
	vm_offset_t	where;
	int		spl;
	vm_size_t size;
	extern boolean_t kernacc(off_t, size_t );

	while (uio->uio_resid > 0 && error == 0) {
		iov = uio->uio_iov;
		if (iov->iov_len == 0) {
			uio->uio_iov++;
			uio->uio_iovcnt--;
			if (uio->uio_iovcnt < 0)
				panic("mmrw");
			continue;
		}
		switch (minor(dev)) {

/* minor device 0 is physical memory */
		case 0:
			v = trunc_page(uio->uio_offset);
			if (uio->uio_offset >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : mem_size))
				goto fault;

			size= PAGE_SIZE;

			if(dgWork.dgFlags & enaDiagDM) {			/* Can we really get all memory? */
				if (kmem_alloc_pageable(kernel_map, &where, size) != KERN_SUCCESS) {
					goto fault;
				}
				else {
					(void)mapping_make(kernel_pmap, 0, where, v, 
						VM_PROT_READ, 2, 0);	/* Map it in for the moment */
				}
			}
			else {
				if (kmem_alloc(kernel_map, &where, size) 
					!= KERN_SUCCESS) {
					goto fault;
				}
			}
			o = uio->uio_offset - v;
			c = min(PAGE_SIZE - o, (u_int)iov->iov_len);
			error = uiomove((caddr_t) (where + o), c, uio);

			if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, where);	/* Unmap it */
			kmem_free(kernel_map, where, PAGE_SIZE);
			continue;

		/* minor device 1 is kernel memory */
		case 1:
			/* Do some sanity checking */
			if (((caddr_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) ||
				((caddr_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS))
				goto fault;
			c = iov->iov_len;
			if (!kernacc((caddr_t)uio->uio_offset, c))
				goto fault;
			error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
			continue;

		/* minor device 2 is EOF/RATHOLE */
		case 2:
			if (rw == UIO_READ)
				return (0);
			c = iov->iov_len;
			break;
		/* minor device 3 is ZERO/RATHOLE */
		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 = iov->iov_len;
				break;
			}
			c = min(iov->iov_len, PAGE_SIZE);
			error = uiomove(devzerobuf, (int)c, uio);
			continue;
		default:
			goto fault;
			break;
		}
			
		if (error)
			break;
		iov->iov_base += c;
		iov->iov_len -= c;
		uio->uio_offset += c;
		uio->uio_resid -= c;
	}
	return (error);
fault:
	return (EFAULT);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*-
	26	* Copyright (c) 1988 University of Utah.
	27	* Copyright (c) 1982, 1986, 1990, 1993
	28	* The Regents of the University of California. All rights reserved.
	29	*
	30	* This code is derived from software contributed to Berkeley by
	31	* the Systems Programming Group of the University of Utah Computer
	32	* Science Department, and code derived from software contributed to
	33	* Berkeley by William Jolitz.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. All advertising materials mentioning features or use of this software
	44	* must display the following acknowledgement:
	45	* This product includes software developed by the University of
	46	* California, Berkeley and its contributors.
	47	* 4. Neither the name of the University nor the names of its contributors
	48	* may be used to endorse or promote products derived from this software
	49	* without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	52	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	53	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	54	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	55	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	56	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	57	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	58	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	59	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	60	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	61	* SUCH DAMAGE.
	62	*
	63	* from: Utah $Hdr: mem.c 1.13 89/10/08$
	64	* @(#)mem.c 8.1 (Berkeley) 6/11/93
	65	*/
	66
	67	#include <mach_load.h>
	68
	69	/*
	70	* Memory special file
	71	*/
	72
	73	#include <sys/param.h>
	74	#include <sys/dir.h>
	75	#include <sys/proc.h>
	76	#include <sys/buf.h>
	77	#include <sys/systm.h>
	78	#include <sys/vm.h>
	79	#include <sys/uio.h>
	80	#include <sys/malloc.h>
	81
	82	#include <vm/pmap.h>
	83	#include <vm/vm_map.h>
	84	#include <vm/vm_kern.h>
	85	#include <mach/vm_param.h>
86
9bccf70c A	87	#include <ppc/Diagnostics.h>
9bccf70c A	88	#include <ppc/mappings.h>
1c79356b A	89
	90	static caddr_t devzerobuf;
	91
de355530	92	extern vm_offset_t mem_actual;
1c79356b A	93	extern pmap_t kernel_pmap;
	94
	95	mmread(dev, uio)
	96	dev_t dev;
	97	struct uio *uio;
	98	{
	99
	100	return (mmrw(dev, uio, UIO_READ));
	101	}
	102
	103	mmwrite(dev, uio)
	104	dev_t dev;
	105	struct uio *uio;
	106	{
	107
	108	return (mmrw(dev, uio, UIO_WRITE));
	109	}
	110
	111	mmrw(dev, uio, rw)
	112	dev_t dev;
	113	struct uio *uio;
	114	enum uio_rw rw;
	115	{
	116	register int o;
	117	register u_int c, v;
	118	register struct iovec *iov;
	119	int error = 0;
	120	vm_offset_t where;
	121	int spl;
	122	vm_size_t size;
	123	extern boolean_t kernacc(off_t, size_t );
	124
	125	while (uio->uio_resid > 0 && error == 0) {
	126	iov = uio->uio_iov;
	127	if (iov->iov_len == 0) {
	128	uio->uio_iov++;
	129	uio->uio_iovcnt--;
	130	if (uio->uio_iovcnt < 0)
	131	panic("mmrw");
	132	continue;
	133	}
	134	switch (minor(dev)) {
	135
	136	/* minor device 0 is physical memory */
	137	case 0:
de355530 A	138	v = trunc_page(uio->uio_offset);
de355530 A	139	if (uio->uio_offset >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : mem_size))
1c79356b A	140	goto fault;
1c79356b A	141
de355530 A	142	size= PAGE_SIZE;
de355530 A	143
1c79356b	144	if(dgWork.dgFlags & enaDiagDM) { /* Can we really get all memory? */
de355530	145	if (kmem_alloc_pageable(kernel_map, &where, size) != KERN_SUCCESS) {
1c79356b A	146	goto fault;
	147	}
	148	else {
de355530 A	149	(void)mapping_make(kernel_pmap, 0, where, v,
de355530 A	150	VM_PROT_READ, 2, 0); /* Map it in for the moment */
1c79356b A	151	}
	152	}
	153	else {
de355530	154	if (kmem_alloc(kernel_map, &where, size)
1c79356b A	155	!= KERN_SUCCESS) {
	156	goto fault;
	157	}
	158	}
de355530	159	o = uio->uio_offset - v;
1c79356b	160	c = min(PAGE_SIZE - o, (u_int)iov->iov_len);
de355530	161	error = uiomove((caddr_t) (where + o), c, uio);
1c79356b	162
de355530	163	if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, where); /* Unmap it */
1c79356b A	164	kmem_free(kernel_map, where, PAGE_SIZE);
	165	continue;
	166
	167	/* minor device 1 is kernel memory */
	168	case 1:
	169	/* Do some sanity checking */
de355530 A	170	if (((caddr_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) \|\|
de355530 A	171	((caddr_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS))
1c79356b A	172	goto fault;
1c79356b A	173	c = iov->iov_len;
de355530	174	if (!kernacc((caddr_t)uio->uio_offset, c))
1c79356b	175	goto fault;
de355530	176	error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
1c79356b A	177	continue;
	178
	179	/* minor device 2 is EOF/RATHOLE */
	180	case 2:
	181	if (rw == UIO_READ)
	182	return (0);
	183	c = iov->iov_len;
	184	break;
	185	/* minor device 3 is ZERO/RATHOLE */
	186	case 3:
	187	if(devzerobuf == NULL) {
	188	MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
	189	bzero(devzerobuf, PAGE_SIZE);
	190	}
	191	if(uio->uio_rw == UIO_WRITE) {
	192	c = iov->iov_len;
	193	break;
	194	}
	195	c = min(iov->iov_len, PAGE_SIZE);
	196	error = uiomove(devzerobuf, (int)c, uio);
	197	continue;
	198	default:
	199	goto fault;
	200	break;
	201	}
	202
	203	if (error)
	204	break;
	205	iov->iov_base += c;
	206	iov->iov_len -= c;
	207	uio->uio_offset += c;
	208	uio->uio_resid -= c;
	209	}
	210	return (error);
	211	fault:
	212	return (EFAULT);
	213	}
	214