2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
35 * from: Utah $Hdr: mem.c 1.13 89/10/08$
36 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
46 #include <sys/param.h>
48 #include <sys/fcntl.h>
49 #include <sys/kernel.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>
57 #include <sys/signalvar.h>
58 #include <sys/systm.h>
61 #include <machine/cpu.h>
62 #include <machine/frame.h>
66 #include <vm/vm_extern.h>
68 #include <machine/memdev.h>
70 struct mem_range_softc mem_range_softc;
73 ia64_pa_access(vm_offset_t pa)
75 return (VM_PROT_READ|VM_PROT_WRITE);
80 memrw(struct cdev *dev, struct uio *uio, int flags)
83 vm_offset_t addr, eaddr, o, v;
87 while (uio->uio_resid > 0 && !error) {
89 if (iov->iov_len == 0) {
92 if (uio->uio_iovcnt < 0)
97 if (dev2unit(dev) == CDEV_MINOR_MEM) {
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) {
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);
114 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
117 if (v >= IA64_RR_BASE(6)) {
122 c = min(iov->iov_len, MAXPHYS);
125 * Make sure that all of the pages are currently
126 * resident so that we don't create any zero-fill
129 addr = trunc_page(v);
130 eaddr = round_page(v + c);
131 for (; addr < eaddr; addr += PAGE_SIZE) {
132 if (pmap_extract(kernel_pmap, addr) == 0)
135 if (!kernacc((caddr_t)v, c, (uio->uio_rw == UIO_READ)
136 ? VM_PROT_READ : VM_PROT_WRITE))
138 error = uiomove((caddr_t)v, c, uio);
147 * allow user processes to MMAP some memory sections
148 * instead of going through read/write
151 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
154 * /dev/mem is the only one that makes sense through this
155 * interface. For /dev/kmem any physaddr we return here
156 * could be transient and hence incorrect or invalid at
159 if (dev2unit(dev) != CDEV_MINOR_MEM)
163 * Allow access only in RAM.
165 if ((prot & ia64_pa_access(atop((vm_offset_t)offset))) != prot)
167 *paddr = IA64_PHYS_TO_RR7(offset);
172 dev_mem_md_init(void)