memdev.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Mark R V Murray
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/conf.h>
   35 #include <sys/fcntl.h>
   36 #include <sys/ioccom.h>
   37 #include <sys/kernel.h>
   38 #include <sys/kerneldump.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/memrange.h>
   42 #include <sys/module.h>
   43 #include <sys/mutex.h>
   44 #include <sys/priv.h>
   45 #include <sys/proc.h>
   46 #include <sys/signalvar.h>
   47 #include <sys/systm.h>
   48 #include <sys/uio.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_param.h>
   52 #include <vm/pmap.h>
   53 #include <vm/vm_map.h>
   54 #include <vm/vm_object.h>
   55 #include <vm/vm_page.h>
   56 #include <vm/vm_phys.h>
   57 
   58 #include <machine/memdev.h>
   59 
   60 static struct cdev *memdev, *kmemdev;
   61 
   62 static d_ioctl_t memioctl;
   63 
   64 static struct cdevsw mem_cdevsw = {
   65         .d_version =    D_VERSION,
   66         .d_flags =      D_MEM,
   67         .d_open =       memopen,
   68         .d_read =       memrw,
   69         .d_write =      memrw,
   70         .d_ioctl =      memioctl,
   71         .d_mmap =       memmmap,
   72         .d_name =       "mem",
   73 };
   74 
   75 /* ARGSUSED */
   76 int
   77 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
   78     struct thread *td)
   79 {
   80         int error = 0;
   81 
   82         if (flags & FREAD)
   83                 error = priv_check(td, PRIV_KMEM_READ);
   84         if (flags & FWRITE) {
   85                 if (error == 0)
   86                         error = priv_check(td, PRIV_KMEM_WRITE);
   87                 if (error == 0)
   88                         error = securelevel_gt(td->td_ucred, 0);
   89         }
   90 
   91         return (error);
   92 }
   93 
   94 static int
   95 memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
   96     struct thread *td)
   97 {
   98         vm_map_t map;
   99         vm_map_entry_t entry;
  100         const struct mem_livedump_arg *marg;
  101         struct mem_extract *me;
  102         int error;
  103 
  104         error = 0;
  105         switch (cmd) {
  106         case MEM_EXTRACT_PADDR:
  107                 me = (struct mem_extract *)data;
  108 
  109                 map = &td->td_proc->p_vmspace->vm_map;
  110                 vm_map_lock_read(map);
  111                 if (vm_map_lookup_entry(map, me->me_vaddr, &entry)) {
  112                         me->me_paddr = pmap_extract(
  113                             &td->td_proc->p_vmspace->vm_pmap, me->me_vaddr);
  114                         if (me->me_paddr != 0) {
  115                                 me->me_state = ME_STATE_MAPPED;
  116                                 me->me_domain = vm_phys_domain(me->me_paddr);
  117                         } else {
  118                                 me->me_state = ME_STATE_VALID;
  119                         }
  120                 } else {
  121                         me->me_state = ME_STATE_INVALID;
  122                 }
  123                 vm_map_unlock_read(map);
  124                 break;
  125         case MEM_KERNELDUMP:
  126                 marg = (const struct mem_livedump_arg *)data;
  127                 error = livedump_start(marg->fd, marg->flags, marg->compression);
  128                 break;
  129         default:
  130                 error = memioctl_md(dev, cmd, data, flags, td);
  131                 break;
  132         }
  133         return (error);
  134 }
  135 
  136 /* ARGSUSED */
  137 static int
  138 mem_modevent(module_t mod __unused, int type, void *data __unused)
  139 {
  140         switch(type) {
  141         case MOD_LOAD:
  142                 if (bootverbose)
  143                         printf("mem: <memory>\n");
  144                 mem_range_init();
  145                 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
  146                         UID_ROOT, GID_KMEM, 0640, "mem");
  147                 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
  148                         UID_ROOT, GID_KMEM, 0640, "kmem");
  149                 break;
  150 
  151         case MOD_UNLOAD:
  152                 mem_range_destroy();
  153                 destroy_dev(memdev);
  154                 destroy_dev(kmemdev);
  155                 break;
  156 
  157         case MOD_SHUTDOWN:
  158                 break;
  159 
  160         default:
  161                 return(EOPNOTSUPP);
  162         }
  163 
  164         return (0);
  165 }
  166 
  167 DEV_MODULE(mem, mem_modevent, NULL);
  168 MODULE_VERSION(mem, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/mem/memdev.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mem/memdev.c