1 /* in_systm.h 4.12 82/06/20 */ 2 3 /* 4 * Miscellaneous internetwork 5 * definitions for kernel. 6 */ 7 8 #ifndef LOCORE 9 /* 10 * Network types. 11 * 12 * Internally the system keeps counters in the headers with the bytes 13 * swapped so that VAX instructions will work on them. It reverses 14 * the bytes before transmission at each protocol level. The n_ types 15 * represent the types with the bytes in ``high-ender'' order. 16 */ 17 typedef u_short n_short; /* short as received from the net */ 18 typedef u_long n_long; /* long as received from the net */ 19 20 typedef u_long n_time; /* ms since 00:00 GMT, byte rev */ 21 #endif 22 23 /* 24 * The internet code runs off software interrupts. 25 * 26 * You can switch into the network by doing splnet() and return by splx(). 27 * The software interrupt level for the network is higher than the software 28 * level for the clock (so you can enter the network in routines called 29 * at timeout time). Splimp is an ipl high enough to block all imps. 30 * While manipulating the mbuf buffer pool you have to block imps. 31 */ 32 33 /* splnet is defined in ../sys/asm.sed */ 34 #include "ec.h" 35 #if NEC > 0 36 #define splimp spl6 37 #else 38 #define splimp spl5 39 #endif 40 #define setsoftnet() mtpr(SIRR, 12) 41 42 /* 43 * Each ``pup-level-1'' input queue has a bit in a ``netisr'' status 44 * word which is used to de-multiplex a single software 45 * interrupt used for scheduling the network code to calls 46 * on the lowest level routine of each protocol. 47 */ 48 #define NETISR_RAW 0 /* same as AF_UNSPEC */ 49 #define NETISR_IP 2 /* same as AF_INET */ 50 #define NETISR_NS 6 /* same as AF_NS */ 51 52 #define schednetisr(anisr) { netisr |= 1<<(anisr); setsoftnet(); } 53 54 #ifndef LOCORE 55 #ifdef KERNEL 56 int netisr; /* scheduling bits for network */ 57 n_time iptime(); 58 #endif 59 #endif 60