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

/*
 * Copyright (c) 2000-2004 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/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 );
extern int setup_kmem;

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(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, 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:
			if (setup_kmem == 0)
				return(ENODEV);
			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:
			if (setup_kmem == 0)
				return(ENODEV);
			/* 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	/*
91447636	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
37839358 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	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 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,
37839358 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>
1c79356b A	73	#include <sys/systm.h>
1c79356b A	74	#include <sys/vm.h>
91447636	75	#include <sys/uio_internal.h>
1c79356b A	76	#include <sys/malloc.h>
	77
	78	#include <vm/pmap.h>
	79	#include <vm/vm_map.h>
	80	#include <vm/vm_kern.h>
	81	#include <mach/vm_param.h>
	82
9bccf70c A	83	#include <ppc/Diagnostics.h>
9bccf70c A	84	#include <ppc/mappings.h>
1c79356b A	85
	86	static caddr_t devzerobuf;
	87
1c79356b	88	extern pmap_t kernel_pmap;
91447636	89	extern boolean_t kernacc(off_t, size_t );
c0fea474	90	extern int setup_kmem;
1c79356b	91
91447636 A	92	int mmread(dev_t dev, struct uio *uio);
	93	int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw);
	94	int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
	95	int mmwrite(dev_t dev, struct uio *uio);
	96
	97	int
1c79356b A	98	mmread(dev, uio)
	99	dev_t dev;
	100	struct uio *uio;
	101	{
	102
	103	return (mmrw(dev, uio, UIO_READ));
	104	}
	105
91447636	106	int
1c79356b A	107	mmwrite(dev, uio)
	108	dev_t dev;
	109	struct uio *uio;
	110	{
	111
	112	return (mmrw(dev, uio, UIO_WRITE));
	113	}
	114
91447636	115	int
c0fea474	116	mmioctl(dev_t dev, u_long cmd, __unused caddr_t data,
91447636 A	117	__unused int flag, __unused struct proc *p)
91447636 A	118	{
c0fea474 A	119	int minnum = minor(dev);
	120
	121	if ((setup_kmem == 0) && ((minnum == 0) \|\| (minnum == 1)))
	122	return(EINVAL);
	123
91447636 A	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	151
c0fea474	152
91447636 A	153	while (uio_resid(uio) > 0 && error == 0) {
	154	if (uio_iov_len(uio) == 0) {
	155	uio_next_iov(uio);
1c79356b A	156	uio->uio_iovcnt--;
	157	if (uio->uio_iovcnt < 0)
	158	panic("mmrw");
	159	continue;
	160	}
	161	switch (minor(dev)) {
	162
	163	/* minor device 0 is physical memory */
	164	case 0:
c0fea474 A	165	if (setup_kmem == 0)
c0fea474 A	166	return(ENODEV);
55e303ae A	167	vll = trunc_page_64(uio->uio_offset);
55e303ae A	168	if(((vll >> 31) == 1) \|\| vll >= ((dgWork.dgFlags & enaDiagDM) ? mem_actual : max_mem))
1c79356b A	169	goto fault;
1c79356b A	170
1c79356b	171	if(dgWork.dgFlags & enaDiagDM) { /* Can we really get all memory? */
55e303ae	172	if (kmem_alloc_pageable(kernel_map, &where, PAGE_SIZE) != KERN_SUCCESS) {
1c79356b A	173	goto fault;
	174	}
	175	else {
55e303ae A	176	addr64_t collad;
	177
	178	collad = mapping_make(kernel_pmap, (addr64_t)where, (ppnum_t)(vll >> 12), 0, 1, VM_PROT_READ); /* Map it in for the moment */
	179	if(collad) { /* See if it failed (shouldn't happen) */
	180	kmem_free(kernel_map, where, PAGE_SIZE); /* Toss the page */
	181	goto fault; /* Kill the transfer */
	182	}
1c79356b A	183	}
	184	}
	185	else {
55e303ae	186	if (kmem_alloc(kernel_map, &where, 4096)
1c79356b A	187	!= KERN_SUCCESS) {
	188	goto fault;
	189	}
	190	}
55e303ae	191	o = uio->uio_offset - vll;
91447636 A	192	// LP64todo - fix this!
91447636 A	193	c = min(PAGE_SIZE - o, uio_iov_len(uio));
55e303ae	194	error = uiomove((caddr_t)(where + o), c, uio);
1c79356b	195
55e303ae	196	if(dgWork.dgFlags & enaDiagDM) (void)mapping_remove(kernel_pmap, (addr64_t)where); /* Unmap it */
1c79356b A	197	kmem_free(kernel_map, where, PAGE_SIZE);
	198	continue;
	199
	200	/* minor device 1 is kernel memory */
	201	case 1:
c0fea474 A	202	if (setup_kmem == 0)
c0fea474 A	203	return(ENODEV);
1c79356b	204	/* Do some sanity checking */
55e303ae A	205	if (((addr64_t)uio->uio_offset > vm_last_addr) \|\|
55e303ae A	206	((addr64_t)uio->uio_offset < VM_MIN_KERNEL_ADDRESS))
1c79356b	207	goto fault;
91447636	208	c = uio_iov_len(uio);
55e303ae	209	if (!kernacc(uio->uio_offset, c))
1c79356b	210	goto fault;
91447636	211	error = uiomove64(uio->uio_offset, c, uio);
1c79356b A	212	continue;
	213
	214	/* minor device 2 is EOF/RATHOLE */
	215	case 2:
	216	if (rw == UIO_READ)
	217	return (0);
91447636	218	c = uio_iov_len(uio);
1c79356b A	219	break;
	220	/* minor device 3 is ZERO/RATHOLE */
	221	case 3:
	222	if(devzerobuf == NULL) {
	223	MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK);
	224	bzero(devzerobuf, PAGE_SIZE);
	225	}
	226	if(uio->uio_rw == UIO_WRITE) {
91447636	227	c = uio_iov_len(uio);
1c79356b A	228	break;
1c79356b A	229	}
91447636 A	230	// LP64todo - fix this!
	231	c = min(uio_iov_len(uio), PAGE_SIZE);
	232	error = uiomove(devzerobuf, c, uio);
1c79356b A	233	continue;
	234	default:
	235	goto fault;
	236	break;
	237	}
	238
	239	if (error)
	240	break;
91447636	241	uio_iov_base_add(uio, c);
1c79356b	242	uio->uio_offset += c;
91447636 A	243	#if LP64KERN
	244	uio_setresid(uio, (uio_resid(uio) - c));
	245	uio_iov_len_add(uio, -((int64_t)c));
	246	#else
	247	uio_setresid(uio, (uio_resid(uio) - c));
	248	uio_iov_len_add(uio, -((int)c));
	249	#endif
1c79356b A	250	}
	251	return (error);
	252	fault:
	253	return (EFAULT);
	254	}
	255