/* subr_xxx.c 4.21 82/12/17 */ #include "../machine/pte.h" #include "../h/param.h" #include "../h/systm.h" #include "../h/conf.h" #include "../h/inode.h" #include "../h/dir.h" #include "../h/user.h" #include "../h/buf.h" #include "../h/proc.h" #include "../h/fs.h" #include "../h/vm.h" #include "../h/cmap.h" #include "../h/uio.h" /* * Routine placed in illegal entries in the bdevsw and cdevsw tables. */ nodev() { return (ENODEV); } /* * Null routine; placed in insignificant entries * in the bdevsw and cdevsw tables. */ nulldev() { return (0); } imin(a, b) { return (a < b ? a : b); } imax(a, b) { return (a > b ? a : b); } unsigned min(a, b) u_int a, b; { return (a < b ? a : b); } unsigned max(a, b) u_int a, b; { return (a > b ? a : b); } extern cabase, calimit; extern struct pte camap[]; caddr_t cacur = (caddr_t)&cabase; caddr_t camax = (caddr_t)&cabase; int cax = 0; /* * This is a kernel-mode storage allocator. * It is very primitive, currently, in that * there is no way to give space back. * It serves, for the time being, the needs of * auto-configuration code and the like which * need to allocate some stuff at boot time. */ caddr_t calloc(size) int size; { register caddr_t res; register int i; if (cacur+size >= (caddr_t)&calimit) panic("calloc"); while (cacur+size > camax) { (void) vmemall(&camap[cax], CLSIZE, &proc[0], CSYS); vmaccess(&camap[cax], camax, CLSIZE); for (i = 0; i < CLSIZE; i++) clearseg(camap[cax++].pg_pfnum); camax += NBPG * CLSIZE; } res = cacur; cacur += size; return (res); } #ifndef vax ffs(mask) register long mask; { register int i; for(i=1; i<NSIG; i++) { if (mask & 1) return (i); mask >>= 1; } return (0); } bcmp(s1, s2, len) register char *s1, *s2; register int len; { while (len--) if (*s1++ != *s2++) return (1); return (0); } strlen(s1) register char *s1; { register int len; for (len = 0; *s1++ != '\0'; len++) /* void */; return (len); } #endif /* * Pass back c to the user. */ passuc(c, uio) register c; struct uio *uio; { register struct iovec *iov = uio->uio_iov; switch (uio->uio_segflg) { case 0: if (subyte(iov->iov_base, c) < 0) goto fault; break; case 1: *iov->iov_base = c; break; case 2: if (suibyte(iov->iov_base, c) < 0) goto fault; break; } iov->iov_base++; iov->iov_len--; uio->uio_resid--; uio->uio_offset++; if (iov->iov_len <= 0) { uio->uio_iov++; uio->uio_iovcnt--; } return (0); fault: return (EFAULT); }