4.1cBSD/a/sys/net/netisr.h

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/*	netisr.h	4.3	83/01/17	*/

/*
 * The networking code runs off software interrupts.
 *
 * You can switch into the network by doing splnet() and return by splx().
 * The software interrupt level for the network is higher than the software
 * level for the clock (so you can enter the network in routines called
 * at timeout time).
 */
#if sun
#include "../sun/sir.h"
#define	setsoftnet()	siron(SIR_NET)
#else
/* #include "../vax/mtpr.h" */
#define	setsoftnet()	mtpr(SIRR, 12)
#endif

/*
 * Each ``pup-level-1'' input queue has a bit in a ``netisr'' status
 * word which is used to de-multiplex a single software
 * interrupt used for scheduling the network code to calls
 * on the lowest level routine of each protocol.
 */
#define	NETISR_RAW	0		/* same as AF_UNSPEC */
#define	NETISR_IP	2		/* same as AF_INET */
#define	NETISR_NS	6		/* same as AF_NS */
#define	NETISR_ND	7		/* network disk protocol */

#define	schednetisr(anisr)	{ netisr |= 1<<(anisr); setsoftnet(); }

#ifndef LOCORE
#ifdef KERNEL
int	netisr;				/* scheduling bits for network */
#endif
#endif