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


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

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    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/6.2/sys/arm/arm/mem.c 137362 2004-11-07 23:01:36Z cognet $");
   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 
   67 /*
   68  * Used in /dev/mem drivers and elsewhere
   69  */
   70 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
   71 
   72 /* ARGSUSED */
   73 int
   74 memrw(struct cdev *dev, struct uio *uio, int flags)
   75 {
   76         int o;
   77         u_int c = 0, v;
   78         struct iovec *iov;
   79         int error = 0;
   80         vm_offset_t addr, eaddr;
   81 
   82         GIANT_REQUIRED;
   83 
   84         while (uio->uio_resid > 0 && error == 0) {
   85                 iov = uio->uio_iov;
   86                 if (iov->iov_len == 0) {
   87                         uio->uio_iov++;
   88                         uio->uio_iovcnt--;
   89                         if (uio->uio_iovcnt < 0)
   90                                 panic("memrw");
   91                         continue;
   92                 }
   93                 if (minor(dev) == CDEV_MINOR_MEM) {
   94                         v = uio->uio_offset;
   95                         v &= ~PAGE_MASK;
   96                         pmap_kenter((vm_offset_t)_tmppt, v);
   97                         o = (int)uio->uio_offset & PAGE_MASK;
   98                         c = (u_int)(PAGE_SIZE - ((int)iov->iov_base & PAGE_MASK));
   99                         c = min(c, (u_int)(PAGE_SIZE - o));
  100                         c = min(c, (u_int)iov->iov_len);
  101                         error = uiomove((caddr_t)&_tmppt[o], (int)c, uio);
  102                         pmap_qremove((vm_offset_t)_tmppt, 1);
  103                         continue;
  104                 }
  105                 else if (minor(dev) == CDEV_MINOR_KMEM) {
  106                         c = iov->iov_len;
  107 
  108                         /*
  109                          * Make sure that all of the pages are currently
  110                          * resident so that we don't create any zero-fill
  111                          * pages.
  112                          */
  113                         addr = trunc_page(uio->uio_offset);
  114                         eaddr = round_page(uio->uio_offset + c);
  115 
  116                         for (; addr < eaddr; addr += PAGE_SIZE) 
  117                                 if (pmap_extract(kernel_pmap, addr) == 0)
  118                                         return (EFAULT);
  119 
  120                         if (!kernacc((caddr_t)(int)uio->uio_offset, c,
  121                             uio->uio_rw == UIO_READ ? 
  122                             VM_PROT_READ : VM_PROT_WRITE))
  123                                 return (EFAULT);
  124                         error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio);
  125                         continue;
  126                 }
  127                 /* else panic! */
  128         }
  129         return (error);
  130 }
  131 
  132 /*
  133  * allow user processes to MMAP some memory sections
  134  * instead of going through read/write
  135  */
  136 /* ARGSUSED */
  137 
  138 int
  139 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  140     int prot __unused)
  141 {
  142         if (minor(dev) == CDEV_MINOR_MEM)
  143                 *paddr = offset;
  144         else if (minor(dev) == CDEV_MINOR_KMEM)
  145                 *paddr = vtophys(offset);
  146         /* else panic! */
  147         return (0);
  148 }
  149 
  150 void
  151 dev_mem_md_init(void)
  152 {
  153 }

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