[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 );

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