root/net/ddi.c

/* */

DEFINITIONS

1. ddi_map
2. ddi_init

   1 /*
   2  * ddi.c        Implement the Device Driver Interface (DDI) routines.
   3  *              Currently, this is only used by the NET layer of LINUX,
   4  *              but it eventually might move to an upper directory of
   5  *              the system.
   6  *
   7  * Version:     @(#)ddi.c       1.0.5   04/22/93
   8  *
   9  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  10  */
  11 #include <asm/segment.h>
  12 #include <asm/system.h>
  13 #include <linux/types.h>
  14 #include <linux/config.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/socket.h>
  20 #include <linux/ddi.h>
  21 
  22 
  23 #undef  DDI_DEBUG
  24 #ifdef  DDI_DEBUG
  25 #   define PRINTK(x)    printk x
  26 #else
  27 #   define PRINTK(x)    /**/
  28 #endif
  29 
  30 
  31 extern struct ddi_device        devices[];      /* device driver map    */
  32 extern struct ddi_proto         protocols[];    /* network protocols    */
  33 
  34 
  35 /*
  36  * This function gets called with an ASCII string representing the
  37  * ID of some DDI driver.  We loop through the DDI Devices table
  38  * and return the address of the control block that has a matching
  39  * "name" field.  It is used by upper-level layers that want to
  40  * dynamically bind some UNIX-domain "/dev/XXXX" file name to a
  41  * DDI device driver.  The "iflink(8)" program is an example of
  42  * this behaviour.
  43  */
  44 struct ddi_device *
  45 ddi_map(const char *id)
     /*  */
  46 {
  47   register struct ddi_device *dev;
  48 
  49   PRINTK (("DDI: MAP: looking for \"%s\": ", id));
  50   dev = devices;
  51   while (dev->title != NULL) {
  52         if (strncmp(dev->name, id, DDI_MAXNAME) == 0) {
  53                 PRINTK (("OK at 0x%X\n", dev));
  54                 return(dev);
  55         }
  56         dev++;
  57   }
  58   PRINTK (("NOT FOUND\n"));
  59   return(NULL);
  60 }
  61 
  62 
  63 /*
  64  * This is the function that is called by a kernel routine during
  65  * system startup.  Its purpose is to walk trough the "devices"
  66  * table (defined above), and to call all moduled defined in it.
  67  */
  68 void
  69 ddi_init(void)
     /*  */
  70 {
  71   struct ddi_proto *pro;
  72   struct ddi_device *dev;
  73 
  74   PRINTK (("DDI: Starting up!\n"));
  75 
  76   /* First off, kick all configured protocols. */
  77   pro = protocols;
  78   while (pro->name != NULL) {
  79         (*pro->init)(pro);
  80         pro++;
  81   }
  82   
  83   /* Done.  Now kick all configured device drivers. */
  84   dev = devices;
  85   while (dev->title != NULL) {
  86         (*dev->init)(dev);
  87         dev++;
  88   }
  89 
  90   /* We're all done... */
  91 }

/* */