The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/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("$FreeBSD$");
   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/ioccom.h>
   50 #include <sys/kernel.h>
   51 #include <sys/lock.h>
   52 #include <sys/malloc.h>
   53 #include <sys/memrange.h>
   54 #include <sys/module.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 <vm/vm.h>
   62 #include <vm/pmap.h>
   63 #include <vm/vm_extern.h>
   64 
   65 #include <machine/memdev.h>
   66 #include <machine/vmparam.h>
   67 
   68 #include "opt_global.h"
   69 
   70 /*
   71  * Used in /dev/mem drivers and elsewhere
   72  */
   73 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
   74 
   75 /* ARGSUSED */
   76 int
   77 memrw(struct cdev *dev, struct uio *uio, int flags)
   78 {
   79         int o;
   80         u_int c = 0, v;
   81         struct iovec *iov;
   82         int error = 0;
   83         vm_offset_t addr, eaddr;
   84 
   85         GIANT_REQUIRED;
   86 
   87         while (uio->uio_resid > 0 && error == 0) {
   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                 if (minor(dev) == CDEV_MINOR_MEM) {
   97                         int i;
   98                         int address_valid = 0;
   99 
  100                         v = uio->uio_offset;
  101                         v &= ~PAGE_MASK;
  102                         for (i = 0; phys_avail[i] || phys_avail[i + 1];
  103                         i += 2) {
  104                                 if (v >= phys_avail[i] && 
  105                                     v < phys_avail[i + 1]) {
  106                                         address_valid = 1;
  107                                         break;
  108                                 }
  109                         }
  110                         if (!address_valid)
  111                                 return (EINVAL);
  112                         pmap_kenter((vm_offset_t)_tmppt, v);
  113                         o = (int)uio->uio_offset & PAGE_MASK;
  114                         c = (u_int)(PAGE_SIZE - ((int)iov->iov_base & PAGE_MASK));
  115                         c = min(c, (u_int)(PAGE_SIZE - o));
  116                         c = min(c, (u_int)iov->iov_len);
  117                         error = uiomove((caddr_t)&_tmppt[o], (int)c, uio);
  118                         pmap_qremove((vm_offset_t)_tmppt, 1);
  119                         continue;
  120                 }
  121                 else if (minor(dev) == CDEV_MINOR_KMEM) {
  122                         c = iov->iov_len;
  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(uio->uio_offset);
  130                         eaddr = round_page(uio->uio_offset + c);
  131 
  132                         for (; addr < eaddr; addr += PAGE_SIZE) 
  133                                 if (pmap_extract(kernel_pmap, addr) == 0)
  134                                         return (EFAULT);
  135                         if (!kernacc((caddr_t)(int)uio->uio_offset, c,
  136                             uio->uio_rw == UIO_READ ? 
  137                             VM_PROT_READ : VM_PROT_WRITE))
  138 #ifdef ARM_USE_SMALL_ALLOC
  139                                 if (addr <= VM_MAXUSER_ADDRESS ||
  140                                     addr >= KERNBASE)
  141 #endif
  142                                         return (EFAULT);
  143                         error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio);
  144                         continue;
  145                 }
  146                 /* else panic! */
  147         }
  148         return (error);
  149 }
  150 
  151 /*
  152  * allow user processes to MMAP some memory sections
  153  * instead of going through read/write
  154  */
  155 /* ARGSUSED */
  156 
  157 int
  158 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  159     int prot __unused)
  160 {
  161         if (minor(dev) == CDEV_MINOR_MEM)
  162                 *paddr = offset;
  163         else if (minor(dev) == CDEV_MINOR_KMEM)
  164                 *paddr = vtophys(offset);
  165         /* else panic! */
  166         return (0);
  167 }
  168 
  169 void
  170 dev_mem_md_init(void)
  171 {
  172 }

Cache object: 97dada9a36ddcd65b28a49cb97f30f1e


[ 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.