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/device/subrs.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993,1991,1990,1989,1988 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        subrs.c,v $
   29  * Revision 2.16  93/11/17  16:34:42  dbg
   30  *      ANSI-fied.
   31  *      [93/06/16            dbg]
   32  * 
   33  * Revision 2.15  93/03/09  10:54:20  danner
   34  *      Removed string routines, and the Berkeley copyright that came
   35  *      with them.  The new ones we wrote now live in kern/strings.[ch].
   36  *      [93/03/06            af]
   37  * 
   38  * Revision 2.14  93/01/14  17:27:17  danner
   39  *      64bit cleanup.
   40  *      [92/11/30            af]
   41  * 
   42  * Revision 2.13  92/08/03  17:33:57  jfriedl
   43  *      removed silly prototypes
   44  *      [92/08/02            jfriedl]
   45  * 
   46  * Revision 2.12  92/05/21  17:09:49  jfriedl
   47  *      Cleanup to quiet gcc warnings. Replaced strlen with a faster one.
   48  *      [92/05/16            jfriedl]
   49  * 
   50  * Revision 2.11  91/09/12  16:37:39  bohman
   51  *      Added strlen() (BSD version).
   52  *      [91/09/11  17:07:25  bohman]
   53  * 
   54  * Revision 2.10  91/08/24  11:56:04  af
   55  *      Use BSD string functions now, which of course come with a
   56  *      copyright.  Also, undef them in case some smarty..
   57  *      [91/08/22            af]
   58  * 
   59  * Revision 2.9  91/07/31  17:34:27  dbg
   60  *      Add strcpy.
   61  *      [91/07/30  16:47:37  dbg]
   62  * 
   63  * Revision 2.8  91/05/14  16:01:30  mrt
   64  *      Correcting copyright
   65  * 
   66  * Revision 2.7  91/03/16  14:43:34  rpd
   67  *      Updated for new kmem_alloc interface.
   68  *      [91/03/03            rpd]
   69  * 
   70  * Revision 2.6  91/02/05  17:10:17  mrt
   71  *      Changed to new Mach copyright
   72  *      [91/01/31  17:30:39  mrt]
   73  * 
   74  * Revision 2.5  91/01/08  15:10:02  rpd
   75  *      Added continuation argument to thread_block.
   76  *      [90/12/08            rpd]
   77  * 
   78  * Revision 2.4  90/05/03  15:19:27  dbg
   79  *      Add compatibility routines for BSD-compatible device drivers:
   80  *      sleep, wakeup, geteblk, brelse.
   81  *      [90/03/14            dbg]
   82  * 
   83  * Revision 2.3  90/01/11  11:42:31  dbg
   84  *      De-linted.
   85  *      [89/12/15            dbg]
   86  * 
   87  *      Add lock initialization in if_init_queues.
   88  *      [89/11/30            dbg]
   89  * 
   90  * Revision 2.2  89/11/29  14:08:58  af
   91  *      RCS-ed, added strncmp (needed for scsi label comparisons).
   92  *      [89/10/28            af]
   93  * 
   94  */
   95 /*
   96  * Random device subroutines and stubs.
   97  */
   98 
   99 #include <kern/kern_io.h>
  100 #include <kern/sched_prim.h>
  101 #include <vm/vm_kern.h>
  102 #include <vm/vm_user.h>
  103 #include <device/buf.h>
  104 #include <device/if_hdr.h>
  105 #include <device/if_ether.h>
  106 
  107 
  108 
  109 /*
  110  * Print out disk name and block number for hard disk errors.
  111  */
  112 void harderr(
  113         struct buf *bp,
  114         char *  cp)
  115 {
  116         printf("%s%d%c: hard error sn%d ",
  117                cp,
  118                minor(bp->b_dev) >> 3,
  119                'a' + (minor(bp->b_dev) & 0x7),
  120                bp->b_blkno);
  121 }
  122 
  123 /*
  124  * Ethernet support routines.
  125  */
  126 u_char  etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  127 
  128 /*
  129  * Convert Ethernet address to printable (loggable) representation.
  130  */
  131 char *
  132 ether_sprintf(
  133         register u_char *ap)
  134 {
  135         register i;
  136         static char etherbuf[18];
  137         register char *cp = etherbuf;
  138         static char digits[] = "0123456789abcdef";
  139 
  140         for (i = 0; i < 6; i++) {
  141                 *cp++ = digits[*ap >> 4];
  142                 *cp++ = digits[*ap++ & 0xf];
  143                 *cp++ = ':';
  144         }
  145         *--cp = 0;
  146         return etherbuf;
  147 }
  148 
  149 /*
  150  * Initialize send and receive queues on an interface.
  151  */
  152 void if_init_queues(
  153         register struct ifnet *ifp)
  154 {
  155         IFQ_INIT(&ifp->if_snd);
  156         queue_init(&ifp->if_rcv_port_list);
  157         simple_lock_init(&ifp->if_rcv_port_list_lock);
  158 }
  159 
  160 
  161 /*
  162  * Compatibility with BSD device drivers.
  163  */
  164 void sleep(
  165         void *  channel,
  166         int     priority)
  167 {
  168         assert_wait((event_t) channel, FALSE);  /* not interruptible XXX */
  169         thread_block(CONTINUE_NULL);
  170 }
  171 
  172 void wakeup(
  173         void *  channel)
  174 {
  175         thread_wakeup((event_t) channel);
  176 }
  177 
  178 struct buf *
  179 geteblk(
  180         int     size)
  181 {
  182         register io_req_t       ior;
  183 
  184         io_req_alloc(ior, 0);
  185         ior->io_device = (device_t)0;
  186         ior->io_unit = 0;
  187         ior->io_op = 0;
  188         ior->io_mode = 0;
  189         ior->io_recnum = 0;
  190         ior->io_count = size;
  191         ior->io_residual = 0;
  192         ior->io_error = 0;
  193 
  194         size = round_page(size);
  195         ior->io_alloc_size = size;
  196         if (kmem_alloc(kernel_map, (vm_offset_t *)&ior->io_data, size)
  197                 != KERN_SUCCESS)
  198                     panic("geteblk");
  199 
  200         return ior;
  201 }
  202 
  203 void brelse(
  204         struct buf *bp)
  205 {
  206         register io_req_t       ior = bp;
  207 
  208         (void) vm_deallocate(kernel_map,
  209                         (vm_offset_t) ior->io_data,
  210                         (vm_size_t) ior->io_alloc_size);
  211         io_req_free(ior);
  212 }

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