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/uio_machdep.c

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    1 /*-
    2  * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu>
    3  * Copyright (c) 1982, 1986, 1991, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  * (c) UNIX System Laboratories, Inc.
    6  * All or some portions of this file are derived from material licensed
    7  * to the University of California by American Telephone and Telegraph
    8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    9  * the permission of UNIX System Laboratories, Inc.
   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  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  *      @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
   40  */
   41 
   42 #include <sys/cdefs.h>
   43 __FBSDID("$FreeBSD$");
   44 
   45 #include <sys/param.h>
   46 #include <sys/kernel.h>
   47 #include <sys/lock.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/systm.h>
   51 #include <sys/uio.h>
   52 #include <sys/sf_buf.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_page.h>
   56 
   57 #include <machine/vmparam.h>
   58 
   59 /*
   60  * Implement uiomove(9) from physical memory using sf_bufs to
   61  * avoid the creation and destruction of ephemeral mappings.
   62  */
   63 int
   64 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
   65 {
   66         struct thread *td = curthread;
   67         struct iovec *iov;
   68         void *cp;
   69         vm_offset_t page_offset;
   70         size_t cnt;
   71         int error = 0;
   72         int save = 0;
   73         struct sf_buf *sf;
   74 
   75         KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
   76             ("uiomove_fromphys: mode"));
   77         KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
   78             ("uiomove_fromphys proc"));
   79         save = td->td_pflags & TDP_DEADLKTREAT;
   80         td->td_pflags |= TDP_DEADLKTREAT;
   81         while (n > 0 && uio->uio_resid) {
   82                 iov = uio->uio_iov;
   83                 cnt = iov->iov_len;
   84                 if (cnt == 0) {
   85                         uio->uio_iov++;
   86                         uio->uio_iovcnt--;
   87                         continue;
   88                 }
   89                 if (cnt > n)
   90                         cnt = n;
   91                 page_offset = offset & PAGE_MASK;
   92                 cnt = min(cnt, PAGE_SIZE - page_offset);
   93                 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0);
   94                 cp = (char*)sf_buf_kva(sf) + page_offset;
   95                 switch (uio->uio_segflg) {
   96                 case UIO_USERSPACE:
   97                         if (ticks - PCPU_GET(switchticks) >= hogticks)
   98                                 uio_yield();
   99                         if (uio->uio_rw == UIO_READ)
  100                                 error = copyout(cp, iov->iov_base, cnt);
  101                         else
  102                                 error = copyin(iov->iov_base, cp, cnt);
  103                         if (error) {
  104                                 sf_buf_free(sf);
  105                                 goto out;
  106                         }
  107                         break;
  108                 case UIO_SYSSPACE:
  109                         if (uio->uio_rw == UIO_READ)
  110                                 bcopy(cp, iov->iov_base, cnt);
  111                         else
  112                                 bcopy(iov->iov_base, cp, cnt);
  113                         break;
  114                 case UIO_NOCOPY:
  115                         break;
  116                 }
  117                 sf_buf_free(sf);
  118                 iov->iov_base = (char *)iov->iov_base + cnt;
  119                 iov->iov_len -= cnt;
  120                 uio->uio_resid -= cnt;
  121                 uio->uio_offset += cnt;
  122                 offset += cnt;
  123                 n -= cnt;
  124         }
  125 out:
  126         if (save == 0)
  127                 td->td_pflags &= ~TDP_DEADLKTREAT;
  128         return (error);
  129 }

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