1 /*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1986, 1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * %sccs.include.proprietary.c% 7 * 8 * from: Utah $Hdr: hil_subr.c 1.1 91/11/19$ 9 * 10 * @(#)hil_subr.c 7.3 (Berkeley) 10/11/92 11 */ 12 13 #include <sys/param.h> 14 #include <sys/systm.h> 15 #include <sys/ioctl.h> 16 #include <sys/tty.h> 17 #include <sys/clist.h> 18 19 #include <hp/dev/hilreg.h> 20 21 /* 22 * XXX this file only exists to separate out the AT&T tainted code. 23 */ 24 25 /* 26 * This is just a copy of the virgin q_to_b routine with minor 27 * optimizations for HIL use. It is used because we don't have 28 * to raise the priority to spltty() for most of the clist manipulations. 29 */ 30 hilq_to_b(q, cp, cc) 31 register struct clist *q; 32 register char *cp; 33 { 34 register struct cblock *bp; 35 register int nc; 36 char *acp; 37 int s; 38 extern char cwaiting; 39 40 if (cc <= 0) 41 return (0); 42 s = splhil(); 43 if (q->c_cc <= 0) { 44 q->c_cc = 0; 45 q->c_cf = q->c_cl = NULL; 46 splx(s); 47 return (0); 48 } 49 acp = cp; 50 51 while (cc) { 52 nc = sizeof (struct cblock) - ((int)q->c_cf & CROUND); 53 nc = min(nc, cc); 54 nc = min(nc, q->c_cc); 55 (void) bcopy(q->c_cf, cp, (unsigned)nc); 56 q->c_cf += nc; 57 q->c_cc -= nc; 58 cc -= nc; 59 cp += nc; 60 if (q->c_cc <= 0) { 61 bp = (struct cblock *)(q->c_cf - 1); 62 bp = (struct cblock *)((int)bp & ~CROUND); 63 q->c_cf = q->c_cl = NULL; 64 spltty(); 65 bp->c_next = cfreelist; 66 cfreelist = bp; 67 cfreecount += CBSIZE; 68 if (cwaiting) { 69 wakeup(&cwaiting); 70 cwaiting = 0; 71 } 72 break; 73 } 74 if (((int)q->c_cf & CROUND) == 0) { 75 bp = (struct cblock *)(q->c_cf); 76 bp--; 77 q->c_cf = bp->c_next->c_info; 78 spltty(); 79 bp->c_next = cfreelist; 80 cfreelist = bp; 81 cfreecount += CBSIZE; 82 if (cwaiting) { 83 wakeup(&cwaiting); 84 cwaiting = 0; 85 } 86 splhil(); 87 } 88 } 89 splx(s); 90 return (cp-acp); 91 } 92 93