1/*-
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department, and code derived from software contributed to
9 * Berkeley by William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	from: Utah $Hdr: mem.c 1.13 89/10/08$
36 *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42/*
43 * Memory special file
44 */
45
46#include <sys/param.h>
47#include <sys/conf.h>
48#include <sys/fcntl.h>
49#include <sys/kernel.h>
50#include <sys/lock.h>
51#include <sys/malloc.h>
52#include <sys/memrange.h>
53#include <sys/module.h>
54#include <sys/msgbuf.h>
55#include <sys/mutex.h>
56#include <sys/proc.h>
57#include <sys/signalvar.h>
58#include <sys/systm.h>
59#include <sys/uio.h>
60
61#include <machine/cpu.h>
62#include <machine/frame.h>
63
64#include <vm/vm.h>
65#include <vm/pmap.h>
66#include <vm/vm_extern.h>
67
68#include <machine/memdev.h>
69
70struct mem_range_softc mem_range_softc;
71
72static __inline int
73ia64_pa_access(vm_offset_t pa)
74{
75	return (VM_PROT_READ|VM_PROT_WRITE);
76}
77
78/* ARGSUSED */
79int
80memrw(struct cdev *dev, struct uio *uio, int flags)
81{
82	struct iovec *iov;
83	vm_offset_t addr, eaddr, o, v;
84	int c, error, rw;
85
86	error = 0;
87	while (uio->uio_resid > 0 && !error) {
88		iov = uio->uio_iov;
89		if (iov->iov_len == 0) {
90			uio->uio_iov++;
91			uio->uio_iovcnt--;
92			if (uio->uio_iovcnt < 0)
93				panic("memrw");
94			continue;
95		}
96
97		if (dev2unit(dev) == CDEV_MINOR_MEM) {
98			v = uio->uio_offset;
99kmemphys:
100			/* Allow reads only in RAM. */
101			rw = (uio->uio_rw == UIO_READ)
102			    ? VM_PROT_READ : VM_PROT_WRITE;
103			if ((ia64_pa_access(v) & rw) != rw) {
104				error = EFAULT;
105				c = 0;
106				break;
107			}
108
109			o = uio->uio_offset & PAGE_MASK;
110			c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
111			error = uiomove((caddr_t)IA64_PHYS_TO_RR7(v), c, uio);
112			continue;
113		}
114		else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
115			v = uio->uio_offset;
116
117			if (v >= IA64_RR_BASE(6)) {
118				v = IA64_RR_MASK(v);
119				goto kmemphys;
120			}
121
122			c = min(iov->iov_len, MAXPHYS);
123
124			/*
125			 * Make sure that all of the pages are currently
126			 * resident so that we don't create any zero-fill
127			 * pages.
128			 */
129			addr = trunc_page(v);
130			eaddr = round_page(v + c);
131			if (addr < VM_MAXUSER_ADDRESS)
132				return (EFAULT);
133			for (; addr < eaddr; addr += PAGE_SIZE) {
134				if (pmap_kextract(addr) == 0)
135					return (EFAULT);
136			}
137			if (!kernacc((caddr_t)v, c, (uio->uio_rw == UIO_READ)
138			    ? VM_PROT_READ : VM_PROT_WRITE))
139				return (EFAULT);
140			error = uiomove((caddr_t)v, c, uio);
141			continue;
142		}
143		/* else panic! */
144	}
145	return (error);
146}
147
148/*
149 * allow user processes to MMAP some memory sections
150 * instead of going through read/write
151 */
152int
153memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
154    int prot, vm_memattr_t *memattr)
155{
156	/*
157	 * /dev/mem is the only one that makes sense through this
158	 * interface.  For /dev/kmem any physaddr we return here
159	 * could be transient and hence incorrect or invalid at
160	 * a later time.
161	 */
162	if (dev2unit(dev) != CDEV_MINOR_MEM)
163		return (-1);
164
165	/*
166	 * Allow access only in RAM.
167	 */
168	if ((prot & ia64_pa_access(atop((vm_offset_t)offset))) != prot)
169		return (-1);
170	*paddr = IA64_PHYS_TO_RR7(offset);
171	return (0);
172}
173