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/amd64/amd64/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  * 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  *      @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/6.0/sys/amd64/amd64/uio_machdep.c 139731 2005-01-05 20:17:21Z imp $");
   40 
   41 #include <sys/param.h>
   42 #include <sys/kernel.h>
   43 #include <sys/lock.h>
   44 #include <sys/mutex.h>
   45 #include <sys/proc.h>
   46 #include <sys/systm.h>
   47 #include <sys/uio.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_page.h>
   51 
   52 #include <machine/vmparam.h>
   53 
   54 /*
   55  * Implement uiomove(9) from physical memory using the direct map to
   56  * avoid the creation and destruction of ephemeral mappings.
   57  */
   58 int
   59 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
   60 {
   61         struct thread *td = curthread;
   62         struct iovec *iov;
   63         void *cp;
   64         vm_offset_t page_offset;
   65         size_t cnt;
   66         int error = 0;
   67         int save = 0;
   68 
   69         KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
   70             ("uiomove_fromphys: mode"));
   71         KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
   72             ("uiomove_fromphys proc"));
   73         save = td->td_pflags & TDP_DEADLKTREAT;
   74         td->td_pflags |= TDP_DEADLKTREAT;
   75         while (n > 0 && uio->uio_resid) {
   76                 iov = uio->uio_iov;
   77                 cnt = iov->iov_len;
   78                 if (cnt == 0) {
   79                         uio->uio_iov++;
   80                         uio->uio_iovcnt--;
   81                         continue;
   82                 }
   83                 if (cnt > n)
   84                         cnt = n;
   85                 page_offset = offset & PAGE_MASK;
   86                 cnt = min(cnt, PAGE_SIZE - page_offset);
   87                 cp = (char *)PHYS_TO_DMAP(ma[offset >> PAGE_SHIFT]->phys_addr) +
   88                     page_offset;
   89                 switch (uio->uio_segflg) {
   90                 case UIO_USERSPACE:
   91                         if (ticks - PCPU_GET(switchticks) >= hogticks)
   92                                 uio_yield();
   93                         if (uio->uio_rw == UIO_READ)
   94                                 error = copyout(cp, iov->iov_base, cnt);
   95                         else
   96                                 error = copyin(iov->iov_base, cp, cnt);
   97                         if (error)
   98                                 goto out;
   99                         break;
  100                 case UIO_SYSSPACE:
  101                         if (uio->uio_rw == UIO_READ)
  102                                 bcopy(cp, iov->iov_base, cnt);
  103                         else
  104                                 bcopy(iov->iov_base, cp, cnt);
  105                         break;
  106                 case UIO_NOCOPY:
  107                         break;
  108                 }
  109                 iov->iov_base = (char *)iov->iov_base + cnt;
  110                 iov->iov_len -= cnt;
  111                 uio->uio_resid -= cnt;
  112                 uio->uio_offset += cnt;
  113                 offset += cnt;
  114                 n -= cnt;
  115         }
  116 out:
  117         if (save == 0)
  118                 td->td_pflags &= ~TDP_DEADLKTREAT;
  119         return (error);
  120 }

Cache object: 9a42950356d30dc00c7425ecbf048873


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