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>
49 #include <sys/fcntl.h>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
52 #include <sys/memrange.h>
53 #include <sys/systm.h>
58 #include <vm/vm_extern.h>
60 #include <machine/memdev.h>
62 struct mem_range_softc mem_range_softc;
65 mem_phys2virt(vm_offset_t offset, int prot, void **ptr, u_long *limit)
69 if (prot & ~(VM_PROT_READ | VM_PROT_WRITE))
72 md = efi_md_find(offset);
76 if (md->md_type == EFI_MD_TYPE_BAD)
79 *ptr = (void *)((md->md_attr & EFI_MD_ATTR_WB)
80 ? IA64_PHYS_TO_RR7(offset) : IA64_PHYS_TO_RR6(offset));
81 *limit = (md->md_pages * EFI_PAGE_SIZE) - (offset - md->md_phys);
87 memrw(struct cdev *dev, struct uio *uio, int flags)
94 int count, error, phys, rw;
97 rw = (uio->uio_rw == UIO_READ) ? VM_PROT_READ : VM_PROT_WRITE;
99 while (uio->uio_resid > 0 && !error) {
101 if (iov->iov_len == 0) {
104 if (uio->uio_iovcnt < 0)
109 ofs = uio->uio_offset;
111 phys = (dev2unit(dev) == CDEV_MINOR_MEM) ? 1 : 0;
112 if (phys == 0 && ofs >= IA64_RR_BASE(6)) {
113 ofs = IA64_RR_MASK(ofs);
118 error = mem_phys2virt(ofs, rw, &ptr, &limit);
122 count = min(uio->uio_resid, limit);
123 error = uiomove(ptr, count, uio);
126 count = iov->iov_len;
129 * Make sure that all of the pages are currently
130 * resident so that we don't create any zero-fill
133 limit = round_page(ofs + count);
134 addr = trunc_page(ofs);
135 if (addr < VM_MAXUSER_ADDRESS)
137 for (; addr < limit; addr += PAGE_SIZE) {
138 if (pmap_kextract(addr) == 0)
141 if (!kernacc(ptr, count, rw))
143 error = uiomove(ptr, count, uio);
151 * allow user processes to MMAP some memory sections
152 * instead of going through read/write
155 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
156 int prot, vm_memattr_t *memattr)
163 * /dev/mem is the only one that makes sense through this
164 * interface. For /dev/kmem any physaddr we return here
165 * could be transient and hence incorrect or invalid at
168 if (dev2unit(dev) != CDEV_MINOR_MEM)
171 error = mem_phys2virt(offset, prot, &ptr, &limit);
176 *memattr = ((uintptr_t)ptr >= IA64_RR_BASE(7)) ?
177 VM_MEMATTR_WRITE_BACK : VM_MEMATTR_UNCACHEABLE;