mem.c

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    1 /*-
    2  * Copyright (c) 2014 Andrew Turner
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.2/sys/riscv/riscv/mem.c 295041 2016-01-29 15:12:31Z br $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/conf.h>
   34 #include <sys/malloc.h>
   35 #include <sys/memrange.h>
   36 #include <sys/uio.h>
   37 
   38 #include <machine/memdev.h>
   39 #include <machine/vmparam.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/pmap.h>
   43 #include <vm/vm_extern.h>
   44 #include <vm/vm_page.h>
   45 
   46 struct mem_range_softc mem_range_softc;
   47 
   48 int
   49 memrw(struct cdev *dev, struct uio *uio, int flags)
   50 {
   51         ssize_t orig_resid;
   52         vm_offset_t off, v;
   53         struct iovec *iov;
   54         struct vm_page m;
   55         vm_page_t marr;
   56         u_int cnt;
   57         int error;
   58 
   59         error = 0;
   60         orig_resid = uio->uio_resid;
   61         while (uio->uio_resid > 0 && error == 0) {
   62                 iov = uio->uio_iov;
   63                 if (iov->iov_len == 0) {
   64                         uio->uio_iov++;
   65                         uio->uio_iovcnt--;
   66                         if (uio->uio_iovcnt < 0)
   67                                 panic("memrw");
   68                         continue;
   69                 }
   70 
   71                 v = uio->uio_offset;
   72                 off = v & PAGE_MASK;
   73                 cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off);
   74                 if (cnt == 0)
   75                         continue;
   76 
   77                 switch(dev2unit(dev)) {
   78                 case CDEV_MINOR_KMEM:
   79                         /* If the address is in the DMAP just copy it */
   80                         if (VIRT_IN_DMAP(v)) {
   81                                 error = uiomove((void *)v, cnt, uio);
   82                                 break;
   83                         }
   84 
   85                         if (!kernacc((void *)v, cnt, uio->uio_rw == UIO_READ ?
   86                             VM_PROT_READ : VM_PROT_WRITE)) {
   87                                 error = EFAULT;
   88                                 break;
   89                         }
   90 
   91                         /* Get the physical address to read */
   92                         v = pmap_extract(kernel_pmap, v);
   93                         if (v == 0) {
   94                                 error = EFAULT;
   95                                 break;
   96                         }
   97 
   98                         /* FALLTHROUGH */
   99                 case CDEV_MINOR_MEM:
  100                         /* If within the DMAP use this to copy from */
  101                         if (PHYS_IN_DMAP(v)) {
  102                                 v = PHYS_TO_DMAP(v);
  103                                 error = uiomove((void *)v, cnt, uio);
  104                                 break;
  105                         }
  106 
  107                         /* Have uiomove_fromphys handle the data */
  108                         m.phys_addr = trunc_page(v);
  109                         marr = &m;
  110                         uiomove_fromphys(&marr, off, cnt, uio);
  111                         break;
  112                 }
  113         }
  114 
  115         /*
  116          * Don't return error if any byte was written.  Read and write
  117          * can return error only if no i/o was performed.
  118          */
  119         if (uio->uio_resid != orig_resid)
  120                 error = 0;
  121 
  122         return (error);
  123 }
  124

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FreeBSD/Linux Kernel Cross Reference sys/riscv/riscv/mem.c

FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/mem.c