usr/src/sys/deprecated/netdecnet/dn_systm.h

/*      dn_systm.h      1.2     82/05/15        */

/*
 * Miscellaneous DECnet definitions for kernel
 */

/*
 * Network types.
 *
 * The DECnet protocols often use unaligned 16 bit fields
 * as integers.  The d_short type represents such a field
 * in a protocol structure definition and the D_SHORT macro
 * extracts such a field given a pointer to the first byte.
 * The AD_SHORT macro assigns to such a field.
 * On the VAX it's easy since unaligned references are
 * allowed, on the 11 it would be a bit harder.
 */
typedef char    d_short[2];

#if vax
#define D_SHORT(x)      (*((u_short *)(x)))
#define AD_SHORT(x, v)  (*((u_short *)(x))) = (v)
#endif

/*
 * The DECnet code, like the Internet code, runs off software
 * interrupts.  At present there is only a software interrupt
 * for the NSP layer, which will hand the data to the socket.
 */
#define setnspintr()    mtpr(SIRR, 14)
#define splimp          spl5