usr/src/sys/net/netisr.h

/*      netisr.h        6.1     83/07/29        */

/*
 * 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).
 */
#ifdef vax
#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