/* * ddi.c	Implement the Device Driver Interface (DDI) routines. *		Currently, this is only used by the NET layer of LINUX, *		but it eventually might move to an upper directory of *		the system. * * Version:	@(#)ddi.c	1.0.5	04/22/93 * * Author:	Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> */#include <asm/segment.h>#include <asm/system.h>#include <linux/types.h>#include <linux/config.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/string.h>#include <linux/mm.h>#include <linux/socket.h>#include <linux/ddi.h>#undef	DDI_DEBUG#ifdef	DDI_DEBUG#   define PRINTK(x)	printk x#else#   define PRINTK(x)	/**/#endifextern struct ddi_device	devices[];	/* device driver map	*/extern struct ddi_proto		protocols[];	/* network protocols	*//* * This function gets called with an ASCII string representing the * ID of some DDI driver.  We loop through the DDI Devices table * and return the address of the control block that has a matching * "name" field.  It is used by upper-level layers that want to * dynamically bind some UNIX-domain "/dev/XXXX" file name to a * DDI device driver.  The "iflink(8)" program is an example of * this behaviour. */struct ddi_device *ddi_map(const char *id){  register struct ddi_device *dev;  PRINTK (("DDI: MAP: looking for \"%s\": ", id));  dev = devices;  while (dev->title != NULL) {	if (strncmp(dev->name, id, DDI_MAXNAME) == 0) {		PRINTK (("OK at 0x%X\n", dev));		return(dev);	}	dev++;  }  PRINTK (("NOT FOUND\n"));  return(NULL);}/* * This is the function that is called by a kernel routine during * system startup.  Its purpose is to walk trough the "devices" * table (defined above), and to call all moduled defined in it. */voidddi_init(void){  struct ddi_proto *pro;  struct ddi_device *dev;  PRINTK (("DDI: Starting up!\n"));  /* First off, kick all configured protocols. */  pro = protocols;  while (pro->name != NULL) {	(*pro->init)(pro);	pro++;  }    /* Done.  Now kick all configured device drivers. */  dev = devices;  while (dev->title != NULL) {	(*dev->init)(dev);	dev++;  }  /* We're all done... */}