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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*-
	23	* Copyright (c) 1988 University of Utah.
	24	* Copyright (c) 1982, 1986, 1990, 1993
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* This code is derived from software contributed to Berkeley by
	28	* the Systems Programming Group of the University of Utah Computer
	29	* Science Department, and code derived from software contributed to
	30	* Berkeley by William Jolitz.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by the University of
	43	* California, Berkeley and its contributors.
	44	* 4. Neither the name of the University nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*
	60	* from: Utah $Hdr: mem.c 1.13 89/10/08$
	61	* @(#)mem.c 8.1 (Berkeley) 6/11/93
	62	*/
	63
	64	#include <mach_load.h>
	65
	66	/*
	67	* Memory special file
	68	*/
	69
	70	#include <sys/param.h>
	71	#include <sys/dir.h>
	72	#include <sys/proc.h>
	73	#include <sys/buf.h>
	74	#include <sys/systm.h>
	75	#include <sys/vm.h>
	76	#include <sys/uio.h>
	77	#include <sys/malloc.h>
	78
	79	#include <vm/pmap.h>
	80	#include <vm/vm_map.h>
	81	#include <vm/vm_kern.h>
	82	#include <mach/vm_param.h>
83
9bccf70c A	84	#include <ppc/Diagnostics.h>
9bccf70c A	85	#include <ppc/mappings.h>
1c79356b A	86
	87	static caddr_t devzerobuf;
	88
de355530	89	extern vm_offset_t mem_actual;
1c79356b A	90	extern pmap_t kernel_pmap;
	91
	92	mmread(dev, uio)
	93	dev_t dev;
	94	struct uio *uio;
	95	{
	96
	97	return (mmrw(dev, uio, UIO_READ));
	98	}
	99
	100	mmwrite(dev, uio)
	101	dev_t dev;
	102	struct uio *uio;
	103	{
	104
	105	return (mmrw(dev, uio, UIO_WRITE));
	106	}
	107
	108	mmrw(dev, uio, rw)
	109	dev_t dev;
	110	struct uio *uio;
	111	enum uio_rw rw;
	112	{
	113	register int o;
	114	register u_int c, v;
	115	register struct iovec *iov;
	116	int error = 0;
	117	vm_offset_t where;
	118	int spl;
	119	vm_size_t size;
	120	extern boolean_t kernacc(off_t, size_t );
	121
	122	while (uio->uio_resid > 0 && error == 0) {
	123	iov = uio->uio_iov;
	124	if (iov->iov_len == 0) {
	125	uio->uio_iov++;
	126	uio->uio_iovcnt--;
	127	if (uio->uio_iovcnt < 0)
	128	panic("mmrw");
	129	continue;
	130	}
	131	switch (minor(dev)) {
	132
	133	/* minor device 0 is physical memory */
	134	case 0:
de355530 A	135	v = trunc_page(uio->uio_offset);
de355530 A	136	if (uio->uio_offset >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : mem_size))
1c79356b A	137	goto fault;
1c79356b A	138
de355530 A	139	size= PAGE_SIZE;
de355530 A	140
1c79356b	141	if(dgWork.dgFlags & enaDiagDM) { /* Can we really get all memory? */
de355530	142	if (kmem_alloc_pageable(kernel_map, &where, size) != KERN_SUCCESS) {
1c79356b A	143	goto fault;
	144	}
	145	else {
de355530 A	146	(void)mapping_make(kernel_pmap, 0, where, v,
de355530 A	147	VM_PROT_READ, 2, 0); /* Map it in for the moment */
1c79356b A	148	}
	149	}
	150	else {
de355530	151	if (kmem_alloc(kernel_map, &where, size)
1c79356b A	152	!= KERN_SUCCESS) {
	153	goto fault;
	154	}
	155	}
de355530	156	o = uio->uio_offset - v;
1c79356b	157	c = min(PAGE_SIZE - o, (u_int)iov->iov_len);
de355530	158	error = uiomove((caddr_t) (where + o), c, uio);
1c79356b	159
de355530	160	if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, where); /* Unmap it */
1c79356b A	161	kmem_free(kernel_map, where, PAGE_SIZE);
	162	continue;
	163
	164	/* minor device 1 is kernel memory */
	165	case 1:
	166	/* Do some sanity checking */
de355530 A	167	if (((caddr_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) \|\|
de355530 A	168	((caddr_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS))
1c79356b A	169	goto fault;
1c79356b A	170	c = iov->iov_len;
de355530	171	if (!kernacc((caddr_t)uio->uio_offset, c))
1c79356b	172	goto fault;
de355530	173	error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
1c79356b A	174	continue;
	175
	176	/* minor device 2 is EOF/RATHOLE */
	177	case 2:
	178	if (rw == UIO_READ)
	179	return (0);
	180	c = iov->iov_len;
	181	break;
	182	/* minor device 3 is ZERO/RATHOLE */
	183	case 3:
	184	if(devzerobuf == NULL) {
	185	MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
	186	bzero(devzerobuf, PAGE_SIZE);
	187	}
	188	if(uio->uio_rw == UIO_WRITE) {
	189	c = iov->iov_len;
	190	break;
	191	}
	192	c = min(iov->iov_len, PAGE_SIZE);
	193	error = uiomove(devzerobuf, (int)c, uio);
	194	continue;
	195	default:
	196	goto fault;
	197	break;
	198	}
	199
	200	if (error)
	201	break;
	202	iov->iov_base += c;
	203	iov->iov_len -= c;
	204	uio->uio_offset += c;
	205	uio->uio_resid -= c;
	206	}
	207	return (error);
	208	fault:
	209	return (EFAULT);
	210	}
	211