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("$FreeBSD$");
   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/sf_buf.h>
   47 #include <sys/systm.h>
   48 #include <sys/uio.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_page.h>
   52 #include <vm/vm_param.h>
   53 
   54 #include <machine/cache.h>
   55 #include <machine/tlb.h>
   56 
   57 /*
   58  * Implement uiomove(9) from physical memory using a combination
   59  * of the direct mapping and sf_bufs to reduce the creation and
   60  * destruction of ephemeral mappings.
   61  */
   62 int
   63 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
   64 {
   65         struct sf_buf *sf;
   66         struct thread *td = curthread;
   67         struct iovec *iov;
   68         void *cp;
   69         vm_offset_t page_offset;
   70         vm_paddr_t pa;
   71         vm_page_t m;
   72         size_t cnt;
   73         int error = 0;
   74         int save = 0;
   75 
   76         KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
   77             ("uiomove_fromphys: mode"));
   78         KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
   79             ("uiomove_fromphys proc"));
   80         save = td->td_pflags & TDP_DEADLKTREAT;
   81         td->td_pflags |= TDP_DEADLKTREAT;
   82         while (n > 0 && uio->uio_resid) {
   83                 iov = uio->uio_iov;
   84                 cnt = iov->iov_len;
   85                 if (cnt == 0) {
   86                         uio->uio_iov++;
   87                         uio->uio_iovcnt--;
   88                         continue;
   89                 }
   90                 if (cnt > n)
   91                         cnt = n;
   92                 page_offset = offset & PAGE_MASK;
   93                 cnt = ulmin(cnt, PAGE_SIZE - page_offset);
   94                 m = ma[offset >> PAGE_SHIFT];
   95                 pa = VM_PAGE_TO_PHYS(m);
   96                 if (dcache_color_ignore == 0 &&
   97                     m->md.color != DCACHE_COLOR(pa)) {
   98                         sf = sf_buf_alloc(m, 0);
   99                         cp = (char *)sf_buf_kva(sf) + page_offset;
  100                 } else {
  101                         sf = NULL;
  102                         cp = (char *)TLB_PHYS_TO_DIRECT(pa) + page_offset;
  103                 }
  104                 switch (uio->uio_segflg) {
  105                 case UIO_USERSPACE:
  106                         if (ticks - PCPU_GET(switchticks) >= hogticks)
  107                                 uio_yield();
  108                         if (uio->uio_rw == UIO_READ)
  109                                 error = copyout(cp, iov->iov_base, cnt);
  110                         else
  111                                 error = copyin(iov->iov_base, cp, cnt);
  112                         if (error) {
  113                                 if (sf != NULL)
  114                                         sf_buf_free(sf);
  115                                 goto out;
  116                         }
  117                         break;
  118                 case UIO_SYSSPACE:
  119                         if (uio->uio_rw == UIO_READ)
  120                                 bcopy(cp, iov->iov_base, cnt);
  121                         else
  122                                 bcopy(iov->iov_base, cp, cnt);
  123                         break;
  124                 case UIO_NOCOPY:
  125                         break;
  126                 }
  127                 if (sf != NULL)
  128                         sf_buf_free(sf);
  129                 iov->iov_base = (char *)iov->iov_base + cnt;
  130                 iov->iov_len -= cnt;
  131                 uio->uio_resid -= cnt;
  132                 uio->uio_offset += cnt;
  133                 offset += cnt;
  134                 n -= cnt;
  135         }
  136 out:
  137         if (save == 0)
  138                 td->td_pflags &= ~TDP_DEADLKTREAT;
  139         return (error);
  140 }

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sys/sparc64/sparc64/uio_machdep.c