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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2004 Mark R V Murray
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer
     *    in this position and unchanged.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/fcntl.h>
    #include <sys/ioccom.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/memrange.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/priv.h>
    #include <sys/proc.h>
    #include <sys/signalvar.h>
    #include <sys/systm.h>
    #include <sys/uio.h>
    
    #include <vm/vm.h>
    #include <vm/vm_param.h>
    #include <vm/pmap.h>
    #include <vm/vm_map.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    #include <vm/vm_phys.h>
    
    #include <machine/memdev.h>
    
    static struct cdev *memdev, *kmemdev;
    
    static d_ioctl_t memioctl;
    
    static struct cdevsw mem_cdevsw = {
            .d_version =    D_VERSION,
            .d_flags =      D_MEM,
            .d_open =       memopen,
            .d_read =       memrw,
            .d_write =      memrw,
            .d_ioctl =      memioctl,
            .d_mmap =       memmmap,
            .d_name =       "mem",
    };
    
    /* ARGSUSED */
    int
    memopen(struct cdev *dev __unused, int flags, int fmt __unused,
        struct thread *td)
    {
            int error = 0;
    
            if (flags & FREAD)
                    error = priv_check(td, PRIV_KMEM_READ);
            if (flags & FWRITE) {
                    if (error == 0)
                            error = priv_check(td, PRIV_KMEM_WRITE);
                    if (error == 0)
                            error = securelevel_gt(td->td_ucred, 0);
            }
    
            return (error);
    }
    
    static int
    memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
        struct thread *td)
    {
            vm_map_t map;
            vm_map_entry_t entry;
            struct mem_extract *me;
           int error;
   
           error = 0;
           switch (cmd) {
           case MEM_EXTRACT_PADDR:
                   me = (struct mem_extract *)data;
   
                   map = &td->td_proc->p_vmspace->vm_map;
                   vm_map_lock_read(map);
                   if (vm_map_lookup_entry(map, me->me_vaddr, &entry)) {
                           me->me_paddr = pmap_extract(
                               &td->td_proc->p_vmspace->vm_pmap, me->me_vaddr);
                           if (me->me_paddr != 0) {
                                   me->me_state = ME_STATE_MAPPED;
                                   me->me_domain = vm_phys_domain(me->me_paddr);
                           } else {
                                   me->me_state = ME_STATE_VALID;
                           }
                   } else {
                           me->me_state = ME_STATE_INVALID;
                   }
                   vm_map_unlock_read(map);
                   break;
           default:
                   error = memioctl_md(dev, cmd, data, flags, td);
                   break;
           }
           return (error);
   }
   
   /* ARGSUSED */
   static int
   mem_modevent(module_t mod __unused, int type, void *data __unused)
   {
           switch(type) {
           case MOD_LOAD:
                   if (bootverbose)
                           printf("mem: <memory>\n");
                   mem_range_init();
                   memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
                           UID_ROOT, GID_KMEM, 0640, "mem");
                   kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
                           UID_ROOT, GID_KMEM, 0640, "kmem");
                   break;
   
           case MOD_UNLOAD:
                   mem_range_destroy();
                   destroy_dev(memdev);
                   destroy_dev(kmemdev);
                   break;
   
           case MOD_SHUTDOWN:
                   break;
   
           default:
                   return(EOPNOTSUPP);
           }
   
           return (0);
   }
   
   DEV_MODULE(mem, mem_modevent, NULL);
   MODULE_VERSION(mem, 1);

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