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/i386/i386/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/6.0/sys/i386/i386/mem.c 133129 2004-08-04 18:30:31Z markm $");
   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 
   63 #include <vm/vm.h>
   64 #include <vm/pmap.h>
   65 #include <vm/vm_extern.h>
   66 
   67 #include <machine/memdev.h>
   68 
   69 /*
   70  * Used in /dev/mem drivers and elsewhere
   71  */
   72 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
   73 
   74 /* ARGSUSED */
   75 int
   76 memrw(struct cdev *dev, struct uio *uio, int flags)
   77 {
   78         int o;
   79         u_int c = 0, v;
   80         struct iovec *iov;
   81         int error = 0;
   82         vm_offset_t addr, eaddr;
   83 
   84         GIANT_REQUIRED;
   85 
   86         while (uio->uio_resid > 0 && error == 0) {
   87                 iov = uio->uio_iov;
   88                 if (iov->iov_len == 0) {
   89                         uio->uio_iov++;
   90                         uio->uio_iovcnt--;
   91                         if (uio->uio_iovcnt < 0)
   92                                 panic("memrw");
   93                         continue;
   94                 }
   95                 if (minor(dev) == CDEV_MINOR_MEM) {
   96                         v = uio->uio_offset;
   97                         v &= ~PAGE_MASK;
   98                         pmap_kenter((vm_offset_t)ptvmmap, v);
   99                         o = (int)uio->uio_offset & PAGE_MASK;
  100                         c = (u_int)(PAGE_SIZE - ((int)iov->iov_base & PAGE_MASK));
  101                         c = min(c, (u_int)(PAGE_SIZE - o));
  102                         c = min(c, (u_int)iov->iov_len);
  103                         error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio);
  104                         pmap_qremove((vm_offset_t)ptvmmap, 1);
  105                         continue;
  106                 }
  107                 else if (minor(dev) == CDEV_MINOR_KMEM) {
  108                         c = iov->iov_len;
  109 
  110                         /*
  111                          * Make sure that all of the pages are currently
  112                          * resident so that we don't create any zero-fill
  113                          * pages.
  114                          */
  115                         addr = trunc_page(uio->uio_offset);
  116                         eaddr = round_page(uio->uio_offset + c);
  117 
  118                         if (addr < (vm_offset_t)VADDR(PTDPTDI, 0))
  119                                 return (EFAULT);
  120                         for (; addr < eaddr; addr += PAGE_SIZE) 
  121                                 if (pmap_extract(kernel_pmap, addr) == 0)
  122                                         return (EFAULT);
  123 
  124                         if (!kernacc((caddr_t)(int)uio->uio_offset, c,
  125                             uio->uio_rw == UIO_READ ? 
  126                             VM_PROT_READ : VM_PROT_WRITE))
  127                                 return (EFAULT);
  128                         error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio);
  129                         continue;
  130                 }
  131                 /* else panic! */
  132         }
  133         return (error);
  134 }
  135 
  136 /*
  137  * allow user processes to MMAP some memory sections
  138  * instead of going through read/write
  139  */
  140 /* ARGSUSED */
  141 int
  142 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  143     int prot __unused)
  144 {
  145         if (minor(dev) == CDEV_MINOR_MEM)
  146                 *paddr = offset;
  147         else if (minor(dev) == CDEV_MINOR_KMEM)
  148                 *paddr = vtophys(offset);
  149         /* else panic! */
  150         return (0);
  151 }
  152 
  153 /*
  154  * Operations for changing memory attributes.
  155  *
  156  * This is basically just an ioctl shim for mem_range_attr_get
  157  * and mem_range_attr_set.
  158  */
  159 /* ARGSUSED */
  160 int 
  161 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
  162     struct thread *td)
  163 {
  164         int nd, error = 0;
  165         struct mem_range_op *mo = (struct mem_range_op *)data;
  166         struct mem_range_desc *md;
  167         
  168         /* is this for us? */
  169         if ((cmd != MEMRANGE_GET) &&
  170             (cmd != MEMRANGE_SET))
  171                 return (ENOTTY);
  172 
  173         /* any chance we can handle this? */
  174         if (mem_range_softc.mr_op == NULL)
  175                 return (EOPNOTSUPP);
  176 
  177         /* do we have any descriptors? */
  178         if (mem_range_softc.mr_ndesc == 0)
  179                 return (ENXIO);
  180 
  181         switch (cmd) {
  182         case MEMRANGE_GET:
  183                 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
  184                 if (nd > 0) {
  185                         md = (struct mem_range_desc *)
  186                                 malloc(nd * sizeof(struct mem_range_desc),
  187                                        M_MEMDESC, M_WAITOK);
  188                         error = mem_range_attr_get(md, &nd);
  189                         if (!error)
  190                                 error = copyout(md, mo->mo_desc, 
  191                                         nd * sizeof(struct mem_range_desc));
  192                         free(md, M_MEMDESC);
  193                 }
  194                 else
  195                         nd = mem_range_softc.mr_ndesc;
  196                 mo->mo_arg[0] = nd;
  197                 break;
  198                 
  199         case MEMRANGE_SET:
  200                 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
  201                                                     M_MEMDESC, M_WAITOK);
  202                 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
  203                 /* clamp description string */
  204                 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
  205                 if (error == 0)
  206                         error = mem_range_attr_set(md, &mo->mo_arg[0]);
  207                 free(md, M_MEMDESC);
  208                 break;
  209         }
  210         return (error);
  211 }
  212 
  213 void
  214 dev_mem_md_init(void)
  215 {
  216         if (mem_range_softc.mr_op != NULL)
  217                 mem_range_softc.mr_op->init(&mem_range_softc);
  218 }

Cache object: 0cb2f7a840cd06b70410aabc1643b0a0


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