mem.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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: releng/11.0/sys/mips/mips/mem.c 277643 2015-01-24 12:51:15Z kib $");
   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/mutex.h>
   55 #include <sys/proc.h>
   56 #include <sys/msgbuf.h>
   57 #include <sys/systm.h>
   58 #include <sys/signalvar.h>
   59 #include <sys/uio.h>
   60 
   61 #include <machine/md_var.h>
   62 #include <machine/vmparam.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/pmap.h>
   66 #include <vm/vm_extern.h>
   67 #include <vm/vm_page.h>
   68 
   69 #include <machine/memdev.h>
   70 
   71 struct mem_range_softc mem_range_softc;
   72 
   73 /* ARGSUSED */
   74 int
   75 memrw(struct cdev *dev, struct uio *uio, int flags)
   76 {
   77         struct iovec *iov;
   78         int error = 0;
   79         vm_offset_t va, eva, off, v;
   80         vm_prot_t prot;
   81         struct vm_page m;
   82         vm_page_t marr;
   83         vm_size_t cnt;
   84 
   85         cnt = 0;
   86         error = 0;
   87 
   88         pmap_page_init(&m);
   89         while (uio->uio_resid > 0 && !error) {
   90                 iov = uio->uio_iov;
   91                 if (iov->iov_len == 0) {
   92                         uio->uio_iov++;
   93                         uio->uio_iovcnt--;
   94                         if (uio->uio_iovcnt < 0)
   95                                 panic("memrw");
   96                         continue;
   97                 }
   98                 if (dev2unit(dev) == CDEV_MINOR_MEM) {
   99                         v = uio->uio_offset;
  100 
  101                         off = uio->uio_offset & PAGE_MASK;
  102                         cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
  103                             PAGE_MASK);
  104                         cnt = min(cnt, PAGE_SIZE - off);
  105                         cnt = min(cnt, iov->iov_len);
  106 
  107                         m.phys_addr = trunc_page(v);
  108                         marr = &m;
  109                         error = uiomove_fromphys(&marr, off, cnt, uio);
  110                 }
  111                 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
  112                         va = uio->uio_offset;
  113 
  114                         va = trunc_page(uio->uio_offset);
  115                         eva = round_page(uio->uio_offset
  116                             + iov->iov_len);
  117 
  118                         /* 
  119                          * Make sure that all the pages are currently resident
  120                          * so that we don't create any zero-fill pages.
  121                          */
  122                         if (va >= VM_MIN_KERNEL_ADDRESS &&
  123                             eva <= VM_MAX_KERNEL_ADDRESS) {
  124                                 for (; va < eva; va += PAGE_SIZE)
  125                                         if (pmap_extract(kernel_pmap, va) == 0)
  126                                                 return (EFAULT);
  127 
  128                                 prot = (uio->uio_rw == UIO_READ)
  129                                     ? VM_PROT_READ : VM_PROT_WRITE;
  130 
  131                                 va = uio->uio_offset;
  132                                 if (kernacc((void *) va, iov->iov_len, prot)
  133                                     == FALSE)
  134                                         return (EFAULT);
  135                         }
  136 
  137                         va = uio->uio_offset;
  138                         error = uiomove((void *)va, iov->iov_len, uio);
  139                         continue;
  140                 }
  141         }
  142 
  143         return (error);
  144 }
  145 
  146 /*
  147  * allow user processes to MMAP some memory sections
  148  * instead of going through read/write
  149  */
  150 int
  151 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
  152     int prot, vm_memattr_t *memattr)
  153 {
  154         /*
  155          * /dev/mem is the only one that makes sense through this
  156          * interface.  For /dev/kmem any physaddr we return here
  157          * could be transient and hence incorrect or invalid at
  158          * a later time.
  159          */
  160         if (dev2unit(dev) != CDEV_MINOR_MEM)
  161                 return (-1);
  162 
  163         *paddr = offset;
  164 
  165         return (0);
  166 }

Cache object: 5a70c76dcd52bff200dc21dd023dde2b

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/mips/mips/mem.c

FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/mem.c