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/mem.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1988 University of Utah.
    5  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the Systems Programming Group of the University of Utah Computer
   10  * Science Department, and code derived from software contributed to
   11  * Berkeley by William Jolitz.
   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  *      from: Utah $Hdr: mem.c 1.13 89/10/08$
   38  *      from: @(#)mem.c 7.2 (Berkeley) 5/9/91
   39  */
   40 
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: stable/12/sys/mips/mips/mem.c 365795 2020-09-16 13:46:58Z markj $");
   43 
   44 /*
   45  * Memory special file
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/conf.h>
   50 #include <sys/fcntl.h>
   51 #include <sys/kernel.h>
   52 #include <sys/lock.h>
   53 #include <sys/malloc.h>
   54 #include <sys/memrange.h>
   55 #include <sys/module.h>
   56 #include <sys/mutex.h>
   57 #include <sys/proc.h>
   58 #include <sys/msgbuf.h>
   59 #include <sys/systm.h>
   60 #include <sys/signalvar.h>
   61 #include <sys/uio.h>
   62 
   63 #include <machine/md_var.h>
   64 #include <machine/vmparam.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/pmap.h>
   68 #include <vm/vm_extern.h>
   69 #include <vm/vm_page.h>
   70 
   71 #include <machine/memdev.h>
   72 
   73 struct mem_range_softc mem_range_softc;
   74 
   75 /* ARGSUSED */
   76 int
   77 memrw(struct cdev *dev, struct uio *uio, int flags)
   78 {
   79         struct iovec *iov;
   80         int error = 0;
   81         vm_offset_t va, eva, off, v;
   82         vm_prot_t prot;
   83         struct vm_page m;
   84         vm_page_t marr;
   85         vm_size_t cnt;
   86 
   87         cnt = 0;
   88         error = 0;
   89 
   90         pmap_page_init(&m);
   91         while (uio->uio_resid > 0 && !error) {
   92                 iov = uio->uio_iov;
   93                 if (iov->iov_len == 0) {
   94                         uio->uio_iov++;
   95                         uio->uio_iovcnt--;
   96                         if (uio->uio_iovcnt < 0)
   97                                 panic("memrw");
   98                         continue;
   99                 }
  100                 if (dev2unit(dev) == CDEV_MINOR_MEM) {
  101                         v = uio->uio_offset;
  102 
  103                         off = uio->uio_offset & PAGE_MASK;
  104                         cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
  105                             PAGE_MASK);
  106                         cnt = min(cnt, PAGE_SIZE - off);
  107                         cnt = min(cnt, iov->iov_len);
  108 
  109                         m.phys_addr = trunc_page(v);
  110                         marr = &m;
  111                         error = uiomove_fromphys(&marr, off, cnt, uio);
  112                 }
  113                 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
  114                         va = uio->uio_offset;
  115 
  116                         va = trunc_page(uio->uio_offset);
  117                         eva = round_page(uio->uio_offset
  118                             + iov->iov_len);
  119 
  120                         /* 
  121                          * Make sure that all the pages are currently resident
  122                          * so that we don't create any zero-fill pages.
  123                          */
  124                         if (va >= VM_MIN_KERNEL_ADDRESS &&
  125                             eva <= VM_MAX_KERNEL_ADDRESS) {
  126                                 for (; va < eva; va += PAGE_SIZE)
  127                                         if (pmap_extract(kernel_pmap, va) == 0)
  128                                                 return (EFAULT);
  129 
  130                                 prot = (uio->uio_rw == UIO_READ)
  131                                     ? VM_PROT_READ : VM_PROT_WRITE;
  132 
  133                                 va = uio->uio_offset;
  134                                 if (kernacc((void *) va, iov->iov_len, prot)
  135                                     == FALSE)
  136                                         return (EFAULT);
  137                         }
  138 
  139                         va = uio->uio_offset;
  140                         error = uiomove((void *)va, iov->iov_len, uio);
  141                         continue;
  142                 }
  143         }
  144 
  145         return (error);
  146 }
  147 
  148 /*
  149  * allow user processes to MMAP some memory sections
  150  * instead of going through read/write
  151  */
  152 int
  153 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
  154     int prot, vm_memattr_t *memattr)
  155 {
  156         if (dev2unit(dev) != CDEV_MINOR_MEM)
  157                 return (-1);
  158 
  159         *paddr = offset;
  160 
  161         return (0);
  162 }
  163 
  164 int
  165 memioctl_md(struct cdev *dev __unused, u_long cmd __unused,
  166     caddr_t data __unused, int flags __unused, struct thread *td __unused)
  167 {
  168         return (ENOTTY);
  169 }

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