[apple/xnu.git] / bsd / dev / ppc / 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/vm.h>
#include <sys/uio_internal.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 pmap_t kernel_pmap;
extern boolean_t kernacc(off_t, size_t );

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

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

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

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

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

int
mmioctl(__unused dev_t dev, u_long cmd, __unused caddr_t data, 
		__unused int flag, __unused struct proc *p)
{
	switch (cmd) {
	case FIONBIO:
	case FIOASYNC:
		/* OK to do nothing: we always return immediately */
		break;
	default:
		return ENODEV;
	}

	return (0);
}

int
mmrw(dev, uio, rw)
	dev_t dev;
	struct uio *uio;
	enum uio_rw rw;
{
	register int o;
#if LP64KERN
	register uint64_t c;
#else
	register uint c;
#endif
	addr64_t vll;
	int error = 0;
	vm_offset_t	where;

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

/* minor device 0 is physical memory */
		case 0:
			vll = trunc_page_64(uio->uio_offset);
			if(((vll >> 31) == 1) || vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
				goto fault;

			if(dgWork.dgFlags & enaDiagDM) {			/* Can we really get all memory? */
				if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
					goto fault;
				}
				else {
					addr64_t collad;
					
					collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ);	/* Map it in for the moment */
					if(collad) {						/* See if it failed (shouldn't happen)  */
						kmem_free(kernel_map, where, PAGE_SIZE);	/* Toss the page */
						goto fault;						/* Kill the transfer */
					}
				}
			}
			else {
				if (kmem_alloc(kernel_map, &where, 4096) 
					!= KERN_SUCCESS) {
					goto fault;
				}
			}
			o = uio->uio_offset - vll;
			// LP64todo - fix this!
			c = min(PAGE_SIZE - o, uio_iov_len(uio));
			error = uiomove((caddr_t)(where + o), c, uio);

			if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where);	/* Unmap it */
			kmem_free(kernel_map, where, PAGE_SIZE);
			continue;

		/* minor device 1 is kernel memory */
		case 1:
			/* Do some sanity checking */
			if (((addr64_t)uio->uio_offset > vm_last_addr) ||
				((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
				goto fault;
			c = uio_iov_len(uio);
			if (!kernacc(uio->uio_offset, c))
				goto fault;
			error = uiomove64(uio->uio_offset, c, uio);
			continue;

		/* minor device 2 is EOF/RATHOLE */
		case 2:
			if (rw == UIO_READ)
				return (0);
			c = uio_iov_len(uio);
			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 = uio_iov_len(uio);
				break;
			}
			// LP64todo - fix this!
			c = min(uio_iov_len(uio), PAGE_SIZE);
			error = uiomove(devzerobuf, c, uio);
			continue;
		default:
			goto fault;
			break;
		}
			
		if (error)
			break;
		uio_iov_base_add(uio, c);
		uio->uio_offset += c;
#if LP64KERN
		uio_setresid(uio, (uio_resid(uio) - c));
		uio_iov_len_add(uio, -((int64_t)c));
#else
		uio_setresid(uio, (uio_resid(uio) - c));
		uio_iov_len_add(uio, -((int)c));
#endif
	}
	return (error);
fault:
	return (EFAULT);
}
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	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	* 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 A	79	#include <sys/systm.h>
1c79356b A	80	#include <sys/vm.h>
91447636	81	#include <sys/uio_internal.h>
1c79356b A	82	#include <sys/malloc.h>
	83
	84	#include <vm/pmap.h>
	85	#include <vm/vm_map.h>
	86	#include <vm/vm_kern.h>
	87	#include <mach/vm_param.h>
	88
9bccf70c A	89	#include <ppc/Diagnostics.h>
9bccf70c A	90	#include <ppc/mappings.h>
1c79356b A	91
	92	static caddr_t devzerobuf;
	93
1c79356b	94	extern pmap_t kernel_pmap;
91447636	95	extern boolean_t kernacc(off_t, size_t );
1c79356b	96
91447636 A	97	int mmread(dev_t dev, struct uio *uio);
	98	int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
	99	int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
	100	int mmwrite(dev_t dev, struct uio *uio);
	101
	102	int
1c79356b A	103	mmread(dev, uio)
	104	dev_t dev;
	105	struct uio *uio;
	106	{
	107
	108	return (mmrw(dev, uio, UIO_READ));
	109	}
	110
91447636	111	int
1c79356b A	112	mmwrite(dev, uio)
	113	dev_t dev;
	114	struct uio *uio;
	115	{
	116
	117	return (mmrw(dev, uio, UIO_WRITE));
	118	}
	119
91447636	120	int
8f6c56a5	121	mmioctl(__unused dev_t dev, u_long cmd, __unused caddr_t data,
91447636 A	122	__unused int flag, __unused struct proc *p)
	123	{
	124	switch (cmd) {
	125	case FIONBIO:
	126	case FIOASYNC:
	127	/* OK to do nothing: we always return immediately */
	128	break;
	129	default:
	130	return ENODEV;
	131	}
	132
	133	return (0);
	134	}
	135
	136	int
1c79356b A	137	mmrw(dev, uio, rw)
	138	dev_t dev;
	139	struct uio *uio;
	140	enum uio_rw rw;
	141	{
	142	register int o;
91447636 A	143	#if LP64KERN
	144	register uint64_t c;
	145	#else
	146	register uint c;
	147	#endif
55e303ae	148	addr64_t vll;
1c79356b A	149	int error = 0;
1c79356b A	150	vm_offset_t where;
91447636 A	151
	152	while (uio_resid(uio) > 0 && error == 0) {
	153	if (uio_iov_len(uio) == 0) {
	154	uio_next_iov(uio);
1c79356b A	155	uio->uio_iovcnt--;
	156	if (uio->uio_iovcnt < 0)
	157	panic("mmrw");
	158	continue;
	159	}
	160	switch (minor(dev)) {
	161
	162	/* minor device 0 is physical memory */
	163	case 0:
55e303ae A	164	vll = trunc_page_64(uio->uio_offset);
55e303ae A	165	if(((vll >> 31) == 1) \|\| vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
1c79356b A	166	goto fault;
1c79356b A	167
1c79356b	168	if(dgWork.dgFlags & enaDiagDM) { /* Can we really get all memory? */
55e303ae	169	if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
1c79356b A	170	goto fault;
	171	}
	172	else {
55e303ae A	173	addr64_t collad;
	174
	175	collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ); /* Map it in for the moment */
	176	if(collad) { /* See if it failed (shouldn't happen) */
	177	kmem_free(kernel_map, where, PAGE_SIZE); /* Toss the page */
	178	goto fault; /* Kill the transfer */
	179	}
1c79356b A	180	}
	181	}
	182	else {
55e303ae	183	if (kmem_alloc(kernel_map, &where, 4096)
1c79356b A	184	!= KERN_SUCCESS) {
	185	goto fault;
	186	}
	187	}
55e303ae	188	o = uio->uio_offset - vll;
91447636 A	189	// LP64todo - fix this!
91447636 A	190	c = min(PAGE_SIZE - o, uio_iov_len(uio));
55e303ae	191	error = uiomove((caddr_t)(where + o), c, uio);
1c79356b	192
55e303ae	193	if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where); /* Unmap it */
1c79356b A	194	kmem_free(kernel_map, where, PAGE_SIZE);
	195	continue;
	196
	197	/* minor device 1 is kernel memory */
	198	case 1:
	199	/* Do some sanity checking */
55e303ae A	200	if (((addr64_t)uio->uio_offset > vm_last_addr) \|\|
55e303ae A	201	((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
1c79356b	202	goto fault;
91447636	203	c = uio_iov_len(uio);
55e303ae	204	if (!kernacc(uio->uio_offset, c))
1c79356b	205	goto fault;
91447636	206	error = uiomove64(uio->uio_offset, c, uio);
1c79356b A	207	continue;
	208
	209	/* minor device 2 is EOF/RATHOLE */
	210	case 2:
	211	if (rw == UIO_READ)
	212	return (0);
91447636	213	c = uio_iov_len(uio);
1c79356b A	214	break;
	215	/* minor device 3 is ZERO/RATHOLE */
	216	case 3:
	217	if(devzerobuf == NULL) {
	218	MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
	219	bzero(devzerobuf, PAGE_SIZE);
	220	}
	221	if(uio->uio_rw == UIO_WRITE) {
91447636	222	c = uio_iov_len(uio);
1c79356b A	223	break;
1c79356b A	224	}
91447636 A	225	// LP64todo - fix this!
	226	c = min(uio_iov_len(uio), PAGE_SIZE);
	227	error = uiomove(devzerobuf, c, uio);
1c79356b A	228	continue;
	229	default:
	230	goto fault;
	231	break;
	232	}
	233
	234	if (error)
	235	break;
91447636	236	uio_iov_base_add(uio, c);
1c79356b	237	uio->uio_offset += c;
91447636 A	238	#if LP64KERN
	239	uio_setresid(uio, (uio_resid(uio) - c));
	240	uio_iov_len_add(uio, -((int64_t)c));
	241	#else
	242	uio_setresid(uio, (uio_resid(uio) - c));
	243	uio_iov_len_add(uio, -((int)c));
	244	#endif
1c79356b A	245	}
	246	return (error);
	247	fault:
	248	return (EFAULT);
	249	}
	250