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/powerpc/powerpc/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/7.3/sys/powerpc/powerpc/mem.c 160714 2006-07-26 17:12:54Z marcel $");
   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 
   68 #include <machine/memdev.h>
   69 
   70 struct mem_range_softc mem_range_softc;
   71 
   72 /* ARGSUSED */
   73 int
   74 memrw(struct cdev *dev, struct uio *uio, int flags)
   75 {
   76         struct iovec *iov;
   77         int error = 0;
   78         vm_offset_t va, eva, off, v;
   79         vm_prot_t prot;
   80         vm_size_t cnt;
   81 
   82         cnt = 0;
   83         error = 0;
   84 
   85         GIANT_REQUIRED;
   86 
   87         while (uio->uio_resid > 0 && !error) {
   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 kmem_direct_mapped:     v = uio->uio_offset;
   98 
   99                         off = uio->uio_offset & PAGE_MASK;
  100                         cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
  101                             PAGE_MASK);
  102                         cnt = min(cnt, PAGE_SIZE - off);
  103                         cnt = min(cnt, iov->iov_len);
  104 
  105                         if (mem_valid(v, cnt)
  106                             && pmap_dev_direct_mapped(v, cnt)) {
  107                                 error = EFAULT;
  108                                 break;
  109                         }
  110 
  111                         uiomove((void *)v, cnt, uio);
  112                         break;
  113                 }
  114                 else if (minor(dev) == CDEV_MINOR_KMEM) {
  115                         va = uio->uio_offset;
  116 
  117                         if ((va < VM_MIN_KERNEL_ADDRESS)
  118                             || (va > VM_MAX_KERNEL_ADDRESS))
  119                                 goto kmem_direct_mapped;
  120 
  121                         va = trunc_page(uio->uio_offset);
  122                         eva = round_page(uio->uio_offset
  123                             + iov->iov_len);
  124 
  125                         /* 
  126                          * Make sure that all the pages are currently resident
  127                          * so that we don't create any zero-fill pages.
  128                          */
  129 
  130                         for (; va < eva; va += PAGE_SIZE)
  131                                 if (pmap_extract(kernel_pmap, va)
  132                                     == 0)
  133                                         return (EFAULT);
  134 
  135                         prot = (uio->uio_rw == UIO_READ)
  136                             ? VM_PROT_READ : VM_PROT_WRITE;
  137 
  138                         va = uio->uio_offset;
  139                         if (kernacc((void *) va, iov->iov_len, prot)
  140                             == FALSE)
  141                                 return (EFAULT);
  142 
  143                         error = uiomove((void *)va, iov->iov_len, uio);
  144 
  145                         continue;
  146                 }
  147         }
  148 
  149         return (error);
  150 }
  151 
  152 /*
  153  * allow user processes to MMAP some memory sections
  154  * instead of going through read/write
  155  */
  156 int
  157 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
  158 {
  159         /*
  160          * /dev/mem is the only one that makes sense through this
  161          * interface.  For /dev/kmem any physaddr we return here
  162          * could be transient and hence incorrect or invalid at
  163          * a later time.
  164          */
  165         if (minor(dev) != CDEV_MINOR_MEM)
  166                 return (-1);
  167 
  168         /* Only direct-mapped addresses. */
  169         if (mem_valid(offset, 0)
  170             && pmap_dev_direct_mapped(offset, 0))
  171                 return (EFAULT);
  172 
  173         *paddr = offset;
  174 
  175         return (0);
  176 }
  177 
  178 void
  179 dev_mem_md_init(void)
  180 {
  181 }

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