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/mips/mips/uio_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu>
    5  * Copyright (c) 1982, 1986, 1991, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  * (c) UNIX System Laboratories, Inc.
    8  * All or some portions of this file are derived from material licensed
    9  * to the University of California by American Telephone and Telegraph
   10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   11  * the permission of UNIX System Laboratories, Inc.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD: stable/12/sys/mips/mips/uio_machdep.c 326023 2017-11-20 19:43:44Z pfg $");
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/mutex.h>
   48 #include <sys/proc.h>
   49 #include <sys/sf_buf.h>
   50 #include <sys/uio.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_page.h>
   54 #include <vm/vm_param.h>
   55 
   56 #include <machine/cache.h>
   57 
   58 /*
   59  * Implement uiomove(9) from physical memory using a combination
   60  * of the direct mapping and sf_bufs to reduce the creation and
   61  * 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 sf_buf *sf;
   67         struct thread *td = curthread;
   68         struct iovec *iov;
   69         void *cp;
   70         vm_offset_t page_offset;
   71         vm_paddr_t pa;
   72         vm_page_t m;
   73         size_t cnt;
   74         int error = 0;
   75         int save = 0;
   76 
   77         KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
   78             ("uiomove_fromphys: mode"));
   79         KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
   80             ("uiomove_fromphys proc"));
   81         save = td->td_pflags & TDP_DEADLKTREAT;
   82         td->td_pflags |= TDP_DEADLKTREAT;
   83         while (n > 0 && uio->uio_resid) {
   84                 iov = uio->uio_iov;
   85                 cnt = iov->iov_len;
   86                 if (cnt == 0) {
   87                         uio->uio_iov++;
   88                         uio->uio_iovcnt--;
   89                         continue;
   90                 }
   91                 if (cnt > n)
   92                         cnt = n;
   93                 page_offset = offset & PAGE_MASK;
   94                 cnt = ulmin(cnt, PAGE_SIZE - page_offset);
   95                 m = ma[offset >> PAGE_SHIFT];
   96                 pa = VM_PAGE_TO_PHYS(m);
   97                 if (MIPS_DIRECT_MAPPABLE(pa)) {
   98                         sf = NULL;
   99                         cp = (char *)MIPS_PHYS_TO_DIRECT(pa) + page_offset;
  100                         /*
  101                          * flush all mappings to this page, KSEG0 address first
  102                          * in order to get it overwritten by correct data
  103                          */
  104                         mips_dcache_wbinv_range((vm_offset_t)cp, cnt);
  105                         pmap_flush_pvcache(m);
  106                 } else {
  107                         sf = sf_buf_alloc(m, 0);
  108                         cp = (char *)sf_buf_kva(sf) + page_offset;
  109                 }
  110                 switch (uio->uio_segflg) {
  111                 case UIO_USERSPACE:
  112                         maybe_yield();
  113                         if (uio->uio_rw == UIO_READ)
  114                                 error = copyout(cp, iov->iov_base, cnt);
  115                         else
  116                                 error = copyin(iov->iov_base, cp, cnt);
  117                         if (error) {
  118                                 if (sf != NULL)
  119                                         sf_buf_free(sf);
  120                                 goto out;
  121                         }
  122                         break;
  123                 case UIO_SYSSPACE:
  124                         if (uio->uio_rw == UIO_READ)
  125                                 bcopy(cp, iov->iov_base, cnt);
  126                         else
  127                                 bcopy(iov->iov_base, cp, cnt);
  128                         break;
  129                 case UIO_NOCOPY:
  130                         break;
  131                 }
  132                 if (sf != NULL)
  133                         sf_buf_free(sf);
  134                 else
  135                         mips_dcache_wbinv_range((vm_offset_t)cp, cnt);
  136                 iov->iov_base = (char *)iov->iov_base + cnt;
  137                 iov->iov_len -= cnt;
  138                 uio->uio_resid -= cnt;
  139                 uio->uio_offset += cnt;
  140                 offset += cnt;
  141                 n -= cnt;
  142         }
  143 out:
  144         if (save == 0)
  145                 td->td_pflags &= ~TDP_DEADLKTREAT;
  146         return (error);
  147 }

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