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/mem.c

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    1 /*-
    2  * Copyright (c) 1988 University of Utah.
    3  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department, and code derived from software contributed to
    9  * Berkeley by William Jolitz.
   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  *      from: Utah $Hdr: mem.c 1.13 89/10/08$
   36  *      from: @(#)mem.c 7.2 (Berkeley) 5/9/91
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/8.4/sys/amd64/amd64/mem.c 239881 2012-08-29 20:50:01Z jhb $");
   41 
   42 /*
   43  * Memory special file
   44  */
   45 
   46 #include <sys/param.h>
   47 #include <sys/conf.h>
   48 #include <sys/fcntl.h>
   49 #include <sys/ioccom.h>
   50 #include <sys/kernel.h>
   51 #include <sys/lock.h>
   52 #include <sys/malloc.h>
   53 #include <sys/memrange.h>
   54 #include <sys/module.h>
   55 #include <sys/mutex.h>
   56 #include <sys/proc.h>
   57 #include <sys/signalvar.h>
   58 #include <sys/systm.h>
   59 #include <sys/uio.h>
   60 
   61 #include <machine/specialreg.h>
   62 #include <machine/vmparam.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/pmap.h>
   66 #include <vm/vm_extern.h>
   67 
   68 #include <machine/memdev.h>
   69 
   70 /*
   71  * Used in /dev/mem drivers and elsewhere
   72  */
   73 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
   74 
   75 /* ARGSUSED */
   76 int
   77 memrw(struct cdev *dev, struct uio *uio, int flags)
   78 {
   79         int o;
   80         u_long c = 0, v;
   81         struct iovec *iov;
   82         int error = 0;
   83         vm_offset_t addr, eaddr;
   84 
   85         GIANT_REQUIRED;
   86 
   87         while (uio->uio_resid > 0 && error == 0) {
   88                 iov = uio->uio_iov;
   89                 if (iov->iov_len == 0) {
   90                         uio->uio_iov++;
   91                         uio->uio_iovcnt--;
   92                         if (uio->uio_iovcnt < 0)
   93                                 panic("memrw");
   94                         continue;
   95                 }
   96                 if (dev2unit(dev) == CDEV_MINOR_MEM) {
   97                         v = uio->uio_offset;
   98 kmemphys:
   99                         o = v & PAGE_MASK;
  100                         c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o));
  101                         error = uiomove((void *)PHYS_TO_DMAP(v), (int)c, uio);
  102                         continue;
  103                 }
  104                 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
  105                         v = uio->uio_offset;
  106 
  107                         if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) {
  108                                 v = DMAP_TO_PHYS(v);
  109                                 goto kmemphys;
  110                         }
  111 
  112                         c = iov->iov_len;
  113 
  114                         /*
  115                          * Make sure that all of the pages are currently
  116                          * resident so that we don't create any zero-fill
  117                          * pages.
  118                          */
  119                         addr = trunc_page(v);
  120                         eaddr = round_page(v + c);
  121 
  122                         if (addr < VM_MIN_KERNEL_ADDRESS)
  123                                 return (EFAULT);
  124                         for (; addr < eaddr; addr += PAGE_SIZE) 
  125                                 if (pmap_extract(kernel_pmap, addr) == 0)
  126                                         return (EFAULT);
  127 
  128                         if (!kernacc((caddr_t)(long)v, c,
  129                             uio->uio_rw == UIO_READ ? 
  130                             VM_PROT_READ : VM_PROT_WRITE))
  131                                 return (EFAULT);
  132 
  133                         error = uiomove((caddr_t)(long)v, (int)c, uio);
  134                         continue;
  135                 }
  136                 /* else panic! */
  137         }
  138         return (error);
  139 }
  140 
  141 /*
  142  * allow user processes to MMAP some memory sections
  143  * instead of going through read/write
  144  */
  145 /* ARGSUSED */
  146 int
  147 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  148     int prot __unused)
  149 {
  150         if (dev2unit(dev) == CDEV_MINOR_MEM)
  151                 *paddr = offset;
  152         else if (dev2unit(dev) == CDEV_MINOR_KMEM)
  153                 *paddr = vtophys(offset);
  154         /* else panic! */
  155         return (0);
  156 }
  157 
  158 /*
  159  * Operations for changing memory attributes.
  160  *
  161  * This is basically just an ioctl shim for mem_range_attr_get
  162  * and mem_range_attr_set.
  163  */
  164 /* ARGSUSED */
  165 int 
  166 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
  167     struct thread *td)
  168 {
  169         int nd, error = 0;
  170         struct mem_range_op *mo = (struct mem_range_op *)data;
  171         struct mem_range_desc *md;
  172         
  173         /* is this for us? */
  174         if ((cmd != MEMRANGE_GET) &&
  175             (cmd != MEMRANGE_SET))
  176                 return (ENOTTY);
  177 
  178         /* any chance we can handle this? */
  179         if (mem_range_softc.mr_op == NULL)
  180                 return (EOPNOTSUPP);
  181 
  182         /* do we have any descriptors? */
  183         if (mem_range_softc.mr_ndesc == 0)
  184                 return (ENXIO);
  185 
  186         switch (cmd) {
  187         case MEMRANGE_GET:
  188                 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
  189                 if (nd > 0) {
  190                         md = (struct mem_range_desc *)
  191                                 malloc(nd * sizeof(struct mem_range_desc),
  192                                        M_MEMDESC, M_WAITOK);
  193                         error = mem_range_attr_get(md, &nd);
  194                         if (!error)
  195                                 error = copyout(md, mo->mo_desc, 
  196                                         nd * sizeof(struct mem_range_desc));
  197                         free(md, M_MEMDESC);
  198                 }
  199                 else
  200                         nd = mem_range_softc.mr_ndesc;
  201                 mo->mo_arg[0] = nd;
  202                 break;
  203                 
  204         case MEMRANGE_SET:
  205                 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
  206                                                     M_MEMDESC, M_WAITOK);
  207                 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
  208                 /* clamp description string */
  209                 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
  210                 if (error == 0)
  211                         error = mem_range_attr_set(md, &mo->mo_arg[0]);
  212                 free(md, M_MEMDESC);
  213                 break;
  214         }
  215         return (error);
  216 }

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