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/9.1/sys/powerpc/powerpc/mem.c 217515 2011-01-17 22:58:28Z jkim $");
   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/kernel.h>
   50 #include <sys/lock.h>
   51 #include <sys/ioccom.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/msgbuf.h>
   58 #include <sys/systm.h>
   59 #include <sys/signalvar.h>
   60 #include <sys/uio.h>
   61 
   62 #include <machine/md_var.h>
   63 #include <machine/vmparam.h>
   64 
   65 #include <vm/vm.h>
   66 #include <vm/pmap.h>
   67 #include <vm/vm_extern.h>
   68 #include <vm/vm_page.h>
   69 
   70 #include <machine/memdev.h>
   71 
   72 static void ppc_mrinit(struct mem_range_softc *);
   73 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
   74 
   75 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
   76 
   77 static struct mem_range_ops ppc_mem_range_ops = {
   78         ppc_mrinit,
   79         ppc_mrset,
   80         NULL,
   81         NULL
   82 };
   83 struct mem_range_softc mem_range_softc = {
   84         &ppc_mem_range_ops,
   85         0, 0, NULL
   86 }; 
   87 
   88 /* ARGSUSED */
   89 int
   90 memrw(struct cdev *dev, struct uio *uio, int flags)
   91 {
   92         struct iovec *iov;
   93         int error = 0;
   94         vm_offset_t va, eva, off, v;
   95         vm_prot_t prot;
   96         struct vm_page m;
   97         vm_page_t marr;
   98         vm_size_t cnt;
   99 
  100         cnt = 0;
  101         error = 0;
  102 
  103         GIANT_REQUIRED;
  104 
  105         while (uio->uio_resid > 0 && !error) {
  106                 iov = uio->uio_iov;
  107                 if (iov->iov_len == 0) {
  108                         uio->uio_iov++;
  109                         uio->uio_iovcnt--;
  110                         if (uio->uio_iovcnt < 0)
  111                                 panic("memrw");
  112                         continue;
  113                 }
  114                 if (dev2unit(dev) == CDEV_MINOR_MEM) {
  115 kmem_direct_mapped:     v = uio->uio_offset;
  116 
  117                         off = uio->uio_offset & PAGE_MASK;
  118                         cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
  119                             PAGE_MASK);
  120                         cnt = min(cnt, PAGE_SIZE - off);
  121                         cnt = min(cnt, iov->iov_len);
  122 
  123                         if (mem_valid(v, cnt)) {
  124                                 error = EFAULT;
  125                                 break;
  126                         }
  127         
  128                         if (!pmap_dev_direct_mapped(v, cnt)) {
  129                                 error = uiomove((void *)v, cnt, uio);
  130                         } else {
  131                                 m.phys_addr = trunc_page(v);
  132                                 marr = &m;
  133                                 error = uiomove_fromphys(&marr, off, cnt, uio);
  134                         }
  135                 }
  136                 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
  137                         va = uio->uio_offset;
  138 
  139                         if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
  140                                 goto kmem_direct_mapped;
  141 
  142                         va = trunc_page(uio->uio_offset);
  143                         eva = round_page(uio->uio_offset
  144                             + iov->iov_len);
  145 
  146                         /* 
  147                          * Make sure that all the pages are currently resident
  148                          * so that we don't create any zero-fill pages.
  149                          */
  150 
  151                         for (; va < eva; va += PAGE_SIZE)
  152                                 if (pmap_extract(kernel_pmap, va) == 0)
  153                                         return (EFAULT);
  154 
  155                         prot = (uio->uio_rw == UIO_READ)
  156                             ? VM_PROT_READ : VM_PROT_WRITE;
  157 
  158                         va = uio->uio_offset;
  159                         if (kernacc((void *) va, iov->iov_len, prot)
  160                             == FALSE)
  161                                 return (EFAULT);
  162 
  163                         error = uiomove((void *)va, iov->iov_len, uio);
  164 
  165                         continue;
  166                 }
  167         }
  168 
  169         return (error);
  170 }
  171 
  172 /*
  173  * allow user processes to MMAP some memory sections
  174  * instead of going through read/write
  175  */
  176 int
  177 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
  178     int prot, vm_memattr_t *memattr)
  179 {
  180         int i;
  181 
  182         /*
  183          * /dev/mem is the only one that makes sense through this
  184          * interface.  For /dev/kmem any physaddr we return here
  185          * could be transient and hence incorrect or invalid at
  186          * a later time.
  187          */
  188         if (dev2unit(dev) != CDEV_MINOR_MEM)
  189                 return (-1);
  190 
  191         /* Only direct-mapped addresses. */
  192         if (mem_valid(offset, 0)
  193             && pmap_dev_direct_mapped(offset, 0))
  194                 return (EFAULT);
  195 
  196         *paddr = offset;
  197 
  198         for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
  199                 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
  200                         continue;
  201 
  202                 if (offset >= mem_range_softc.mr_desc[i].mr_base &&
  203                     offset < mem_range_softc.mr_desc[i].mr_base +
  204                     mem_range_softc.mr_desc[i].mr_len) {
  205                         switch (mem_range_softc.mr_desc[i].mr_flags &
  206                             MDF_ATTRMASK) {
  207                         case MDF_WRITEBACK:
  208                                 *memattr = VM_MEMATTR_WRITE_BACK;
  209                                 break;
  210                         case MDF_WRITECOMBINE:
  211                                 *memattr = VM_MEMATTR_WRITE_COMBINING;
  212                                 break;
  213                         case MDF_UNCACHEABLE:
  214                                 *memattr = VM_MEMATTR_UNCACHEABLE;
  215                                 break;
  216                         case MDF_WRITETHROUGH:
  217                                 *memattr = VM_MEMATTR_WRITE_THROUGH;
  218                                 break;
  219                         }
  220 
  221                         break;
  222                 }
  223         }
  224 
  225         return (0);
  226 }
  227 
  228 static void
  229 ppc_mrinit(struct mem_range_softc *sc)
  230 {
  231         sc->mr_cap = 0;
  232         sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
  233         sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
  234             M_MEMDESC, M_NOWAIT | M_ZERO);
  235         if (sc->mr_desc == NULL)
  236                 panic("%s: malloc returns NULL", __func__);
  237 }
  238 
  239 static int
  240 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
  241 {
  242         int i;
  243 
  244         switch(*arg) {
  245         case MEMRANGE_SET_UPDATE:
  246                 for (i = 0; i < sc->mr_ndesc; i++) {
  247                         if (!sc->mr_desc[i].mr_len) {
  248                                 sc->mr_desc[i] = *desc;
  249                                 sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
  250                                 return (0);
  251                         }
  252                         if (sc->mr_desc[i].mr_base == desc->mr_base &&
  253                             sc->mr_desc[i].mr_len == desc->mr_len)
  254                                 return (EEXIST);
  255                 }
  256                 return (ENOSPC);
  257         case MEMRANGE_SET_REMOVE:
  258                 for (i = 0; i < sc->mr_ndesc; i++)
  259                         if (sc->mr_desc[i].mr_base == desc->mr_base &&
  260                             sc->mr_desc[i].mr_len == desc->mr_len) {
  261                                 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
  262                                 return (0);
  263                         }
  264                 return (ENOENT);
  265         default:
  266                 return (EOPNOTSUPP);
  267         }
  268 
  269         return (0);
  270 }
  271 
  272 /*
  273  * Operations for changing memory attributes.
  274  *
  275  * This is basically just an ioctl shim for mem_range_attr_get
  276  * and mem_range_attr_set.
  277  */
  278 /* ARGSUSED */
  279 int 
  280 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
  281     struct thread *td)
  282 {
  283         int nd, error = 0;
  284         struct mem_range_op *mo = (struct mem_range_op *)data;
  285         struct mem_range_desc *md;
  286         
  287         /* is this for us? */
  288         if ((cmd != MEMRANGE_GET) &&
  289             (cmd != MEMRANGE_SET))
  290                 return (ENOTTY);
  291 
  292         /* any chance we can handle this? */
  293         if (mem_range_softc.mr_op == NULL)
  294                 return (EOPNOTSUPP);
  295 
  296         /* do we have any descriptors? */
  297         if (mem_range_softc.mr_ndesc == 0)
  298                 return (ENXIO);
  299 
  300         switch (cmd) {
  301         case MEMRANGE_GET:
  302                 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
  303                 if (nd > 0) {
  304                         md = (struct mem_range_desc *)
  305                                 malloc(nd * sizeof(struct mem_range_desc),
  306                                        M_MEMDESC, M_WAITOK);
  307                         error = mem_range_attr_get(md, &nd);
  308                         if (!error)
  309                                 error = copyout(md, mo->mo_desc, 
  310                                         nd * sizeof(struct mem_range_desc));
  311                         free(md, M_MEMDESC);
  312                 }
  313                 else
  314                         nd = mem_range_softc.mr_ndesc;
  315                 mo->mo_arg[0] = nd;
  316                 break;
  317                 
  318         case MEMRANGE_SET:
  319                 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
  320                                                     M_MEMDESC, M_WAITOK);
  321                 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
  322                 /* clamp description string */
  323                 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
  324                 if (error == 0)
  325                         error = mem_range_attr_set(md, &mo->mo_arg[0]);
  326                 free(md, M_MEMDESC);
  327                 break;
  328         }
  329         return (error);
  330 }
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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powerpc/mem.c

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sys/powerpc/powerpc/mem.c
