usr/src/sys/netinet/in_systm.h

/*      in_systm.h      4.13    82/06/24        */

/*
 * Miscellaneous internetwork
 * definitions for kernel.
 */

#ifndef LOCORE
/*
 * Network types.
 *
 * Internally the system keeps counters in the headers with the bytes
 * swapped so that VAX instructions will work on them.  It reverses
 * the bytes before transmission at each protocol level.  The n_ types
 * represent the types with the bytes in ``high-ender'' order.
 */
typedef u_short n_short;                /* short as received from the net */
typedef u_long  n_long;                 /* long as received from the net */

typedef u_long  n_time;                 /* ms since 00:00 GMT, byte rev */
#endif

/*
 * The internet 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).
 */
#define setsoftnet()    mtpr(SIRR, 12)

/*
 * 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 schednetisr(anisr)      { netisr |= 1<<(anisr); setsoftnet(); }

#ifndef LOCORE
#ifdef KERNEL
int     netisr;                         /* scheduling bits for network */
n_time  iptime();
#endif
#endif