alloc tables at boot time version

[unix-history] / usr / src / sys / kern / tty_subr.c

diff --git a/usr/src/sys/kern/tty_subr.c b/usr/src/sys/kern/tty_subr.c
index f455c0b..4e63419 100644 (file)
--- a/usr/src/sys/kern/tty_subr.c
+++ b/usr/src/sys/kern/tty_subr.c
@@ -1,19 +1,13 @@
-/*     tty_subr.c      3.4     %G%     */
+/*     tty_subr.c      4.7     %G%     */

 
 #include "../h/param.h"
 
 #include "../h/param.h"

-#include "../h/tty.h"

 #include "../h/systm.h"
 #include "../h/conf.h"
 #include "../h/buf.h"
 #include "../h/systm.h"
 #include "../h/conf.h"
 #include "../h/buf.h"

+#include "../h/tty.h"
+#include "../h/clist.h"

 
 

-struct cblock {
-       struct cblock *c_next;
-       char    c_info[CBSIZE];
-};
-
-struct cblock  cfree[NCLIST];
-int    cbad;
-struct cblock  *cfreelist;
+char   cwaiting;

 
 /*
  * Character list get/put
 
 /*
  * Character list get/put


@@ -38,18 +32,53 @@ register struct clist *p;
                        p->c_cl = NULL;
                        bp->c_next = cfreelist;
                        cfreelist = bp;
                        p->c_cl = NULL;
                        bp->c_next = cfreelist;
                        cfreelist = bp;

+                       cfreecount += CBSIZE;
+                       if (cwaiting) {
+                               wakeup(&cwaiting);
+                               cwaiting = 0;
+                       }

                } else if (((int)p->c_cf & CROUND) == 0){
                        bp = (struct cblock *)(p->c_cf);
                        bp--;
                        p->c_cf = bp->c_next->c_info;
                        bp->c_next = cfreelist;
                        cfreelist = bp;
                } else if (((int)p->c_cf & CROUND) == 0){
                        bp = (struct cblock *)(p->c_cf);
                        bp--;
                        p->c_cf = bp->c_next->c_info;
                        bp->c_next = cfreelist;
                        cfreelist = bp;

+                       cfreecount += CBSIZE;
+                       if (cwaiting) {
+                               wakeup(&cwaiting);
+                               cwaiting = 0;
+                       }

                }
        }
        splx(s);
        return(c);
 }
 
                }
        }
        splx(s);
        return(c);
 }
 

+#if HAVTR > 0
+trgetc(p)
+register struct clist *p;
+{
+       register struct cblock *bp;
+       register int c, s;
+
+       if (p->c_cc <= 0) {
+               c = -1;
+               p->c_cc = 0;
+               p->c_cf = NULL;
+       } else {
+               c = *p->c_cf++ & 0377;
+               if (--p->c_cc<=0) {
+                       p->c_cf = NULL;
+               } else if (((int)p->c_cf & CROUND) == 0) {
+                       bp = (struct cblock *)(p->c_cf);
+                       bp--;
+                       p->c_cf = bp->c_next->c_info;
+               }
+       }
+       return(c);
+}
+#endif
+

 /*
  * copy clist to buffer.
  * return number of bytes moved.
 /*
  * copy clist to buffer.
  * return number of bytes moved.


@@ -68,6 +97,7 @@ register char *cp;
        if (q->c_cc <= 0) {
                q->c_cc = 0;
                q->c_cf = q->c_cl = NULL;
        if (q->c_cc <= 0) {
                q->c_cc = 0;
                q->c_cf = q->c_cl = NULL;

+               splx(s);

                return(0);
        }
        acp = cp;
                return(0);
        }
        acp = cp;


@@ -81,6 +111,11 @@ register char *cp;
                        q->c_cf = q->c_cl = NULL;
                        bp->c_next = cfreelist;
                        cfreelist = bp;
                        q->c_cf = q->c_cl = NULL;
                        bp->c_next = cfreelist;
                        cfreelist = bp;

+                       cfreecount += CBSIZE;
+                       if (cwaiting) {
+                               wakeup(&cwaiting);
+                               cwaiting = 0;
+                       }

                        break;
                }
                if (((int)q->c_cf & CROUND) == 0) {
                        break;
                }
                if (((int)q->c_cf & CROUND) == 0) {


@@ -89,12 +124,53 @@ register char *cp;
                        q->c_cf = bp->c_next->c_info;
                        bp->c_next = cfreelist;
                        cfreelist = bp;
                        q->c_cf = bp->c_next->c_info;
                        bp->c_next = cfreelist;
                        cfreelist = bp;

+                       cfreecount += CBSIZE;
+                       if (cwaiting) {
+                               wakeup(&cwaiting);
+                               cwaiting = 0;
+                       }

                }
        }
        splx(s);
        return(cp-acp);
 }
 
                }
        }
        splx(s);
        return(cp-acp);
 }
 

+#if HAVTR > 0
+/*
+ * Traverse a clist copying its contents to a buffer.
+ * q->cc and q->cf are updated with the current position
+ * in the list, but bytes are not released to the freelist.
+ */
+trq_to_b(q, cp, cc)
+register struct clist *q;
+register char *cp;
+register cc;
+{
+       register struct cblock *bp;
+       char *acp;
+
+       if (cc <= 0)
+               return(0);
+       if (q->c_cc <= 0)
+               return(0);
+
+       acp = cp;
+       cc++;
+       while (--cc) {
+               *cp++ = *q->c_cf++;
+               if (((int)q->c_cf & CROUND) == 0) {
+                       bp = (struct cblock *)(q->c_cf);
+                       bp--;
+                       q->c_cf = bp->c_next->c_info;
+               }
+               if (--q->c_cc <= 0)
+                       break;
+       }
+       return(cp-acp);
+}
+#endif
+
+

 /*
  * Return count of contiguous characters
  * in clist starting at q->c_cf.
 /*
  * Return count of contiguous characters
  * in clist starting at q->c_cf.


@@ -123,7 +199,8 @@ int s;
                end += cc;
                while (p < end) {
                        if (*p & flag) {
                end += cc;
                while (p < end) {
                        if (*p & flag) {

-                               cc = (int)p - (int)q->c_cf;
+                               cc = (int)p;
+                               cc -= (int)q->c_cf;

                                break;
                        }
                        p++;
                                break;
                        }
                        p++;


@@ -134,64 +211,71 @@ out:
        return(cc);
 }
 
        return(cc);
 }
 

+
+

 /*
 /*

- * Update clist to show that cc characters
- * were removed.  It is assumed that cc < CBSIZE.
+ * Flush cc bytes from q.

  */
 ndflush(q, cc)
 register struct clist *q;
 register cc;
 {
  */
 ndflush(q, cc)
 register struct clist *q;
 register cc;
 {

+register struct cblock *bp;
+char *end;
+int rem;

 register s;
 
 register s;
 

-       if (cc == 0)
-               return;

        s = spl6();
        if (q->c_cc < 0) {
        s = spl6();
        if (q->c_cc < 0) {

-               if (q->c_cf != NULL) {
-                       q->c_cc += cc;
-                       q->c_cf += cc;
-                       goto out;
-               }
-               q->c_cc = 0;
+               printf("neg q flush\n");

                goto out;
        }
        if (q->c_cc == 0) {
                goto out;
        }
                goto out;
        }
        if (q->c_cc == 0) {
                goto out;
        }

-       if (cc > CBSIZE || cc <= 0) {
-               cbad++;
-               goto out;
-       }
-       q->c_cc -= cc;
-       q->c_cf += cc;
-       if (((int)q->c_cf & CROUND) == 0) {
-               register struct cblock *bp;
-
-               bp = (struct cblock *)(q->c_cf) -1;
-               if (bp->c_next) {
+       while (cc>0 && q->c_cc) {
+               bp = (struct cblock *)((int)q->c_cf & ~CROUND);
+               if ((int)bp == (((int)q->c_cl-1) & ~CROUND)) {
+                       end = q->c_cl;
+               } else {
+                       end = (char *)((int)bp + sizeof (struct cblock));
+               }
+               rem = end - q->c_cf;
+               if (cc >= rem) {
+                       cc -= rem;
+                       q->c_cc -= rem;

                        q->c_cf = bp->c_next->c_info;
                        q->c_cf = bp->c_next->c_info;

+                       bp->c_next = cfreelist;
+                       cfreelist = bp;
+                       cfreecount += CBSIZE;
+                       if (cwaiting) {
+                               wakeup(&cwaiting);
+                               cwaiting = 0;
+                       }

                } else {
                } else {

-                       q->c_cf = q->c_cl = NULL;
+                       q->c_cc -= cc;
+                       q->c_cf += cc;
+                       if (q->c_cc <= 0) {
+                               bp->c_next = cfreelist;
+                               cfreelist = bp;
+                               cfreecount += CBSIZE;
+                               if (cwaiting) {
+                                       wakeup(&cwaiting);
+                                       cwaiting = 0;
+                               }
+                       }
+                       break;

                }
                }

-               bp->c_next = cfreelist;
-               cfreelist = bp;
-       } else
-       if (q->c_cc == 0) {
-               register struct cblock *bp;
-               q->c_cf = (char *)((int)q->c_cf & ~CROUND);
-               bp = (struct cblock *)(q->c_cf);
-               bp->c_next = cfreelist;
-               cfreelist = bp;
+       }
+       if (q->c_cc <= 0) {

                q->c_cf = q->c_cl = NULL;
                q->c_cf = q->c_cl = NULL;

+               q->c_cc = 0;

        }
 out:
        splx(s);
 }
 
        }
 out:
        splx(s);
 }
 

-/*
- * Put character c in queue p.
- */
+

 putc(c, p)
 register struct clist *p;
 {
 putc(c, p)
 register struct clist *p;
 {


@@ -206,6 +290,7 @@ register struct clist *p;
                        return(-1);
                }
                cfreelist = bp->c_next;
                        return(-1);
                }
                cfreelist = bp->c_next;

+               cfreecount -= CBSIZE;

                bp->c_next = NULL;
                p->c_cf = cp = bp->c_info;
        } else if (((int)cp & CROUND) == 0) {
                bp->c_next = NULL;
                p->c_cf = cp = bp->c_info;
        } else if (((int)cp & CROUND) == 0) {


@@ -216,6 +301,7 @@ register struct clist *p;
                }
                bp = bp->c_next;
                cfreelist = bp->c_next;
                }
                bp = bp->c_next;
                cfreelist = bp->c_next;

+               cfreecount -= CBSIZE;

                bp->c_next = NULL;
                cp = bp->c_info;
        }
                bp->c_next = NULL;
                cp = bp->c_info;
        }


@@ -226,6 +312,8 @@ register struct clist *p;
        return(0);
 }
 
        return(0);
 }
 

+
+

 /*
  * copy buffer to clist.
  * return number of bytes not transfered.
 /*
  * copy buffer to clist.
  * return number of bytes not transfered.


@@ -242,11 +330,14 @@ register int cc;
        if (cc <= 0)
                return(0);
        acc = cc;
        if (cc <= 0)
                return(0);
        acc = cc;

+
+

        s = spl6();
        if ((cq = q->c_cl) == NULL || q->c_cc < 0) {
                if ((bp = cfreelist) == NULL) 
                        goto out;
                cfreelist = bp->c_next;
        s = spl6();
        if ((cq = q->c_cl) == NULL || q->c_cc < 0) {
                if ((bp = cfreelist) == NULL) 
                        goto out;
                cfreelist = bp->c_next;

+               cfreecount -= CBSIZE;

                bp->c_next = NULL;
                q->c_cf = cq = bp->c_info;
        }
                bp->c_next = NULL;
                q->c_cf = cq = bp->c_info;
        }


@@ -258,6 +349,7 @@ register int cc;
                                goto out;
                        bp = bp->c_next;
                        cfreelist = bp->c_next;
                                goto out;
                        bp = bp->c_next;
                        cfreelist = bp->c_next;

+                       cfreecount -= CBSIZE;

                        bp->c_next = NULL;
                        cq = bp->c_info;
                }
                        bp->c_next = NULL;
                        cq = bp->c_info;
                }


@@ -271,6 +363,63 @@ out:
        return(cc);
 }
 
        return(cc);
 }
 

+char *
+wb_to_q(cp, cc, q)
+register char *cp;
+register struct clist *q;
+register cc;
+{
+char *f;
+register s;
+
+       s = spl6();
+       while (cc > cfreecount) {
+               cwaiting = 1;
+               sleep(&cwaiting, TTOPRI);
+       }
+       if (q->c_cc==0) {
+               b_to_q(cp, cc, q);
+               f = q->c_cf;
+       } else {
+               (void) putc(*cp++, q);
+               f = q->c_cl;
+               f--;
+               b_to_q(cp, --cc, q);
+       }
+       splx(s);
+       return(f);
+}
+
+#ifdef UCBIPC
+char *
+nb_to_q(cp, cc, q)
+register char *cp;
+register struct clist *q;
+register cc;
+{
+char *f;
+register s;
+
+       s = spl6();
+       if (cc > cfreecount) {
+               f = NULL;
+               goto out;
+       }
+       if (q->c_cc==0) {
+               b_to_q(cp, cc, q);
+               f = q->c_cf;
+       } else {
+               (void) putc(*cp++, q);
+               f = q->c_cl;
+               f--;
+               b_to_q(cp, --cc, q);
+       }
+out:
+       splx(s);
+       return(f);
+}
+#endif
+

 /*
  * Given a non-NULL pointter into the list (like c_cf which
  * always points to a real character if non-NULL) return the pointer
 /*
  * Given a non-NULL pointter into the list (like c_cf which
  * always points to a real character if non-NULL) return the pointer


@@ -314,6 +463,7 @@ register struct clist *p;
                        p->c_cl = p->c_cf = NULL;
                        bp->c_next = cfreelist;
                        cfreelist = bp;
                        p->c_cl = p->c_cf = NULL;
                        bp->c_next = cfreelist;
                        cfreelist = bp;

+                       cfreecount += CBSIZE;

                } else if (((int)p->c_cl & CROUND) == sizeof(bp->c_next)) {
                        p->c_cl = (char *)((int)p->c_cl & ~CROUND);
                        bp = (struct cblock *)p->c_cf;
                } else if (((int)p->c_cl & CROUND) == sizeof(bp->c_next)) {
                        p->c_cl = (char *)((int)p->c_cl & ~CROUND);
                        bp = (struct cblock *)p->c_cf;


@@ -325,6 +475,7 @@ register struct clist *p;
                        bp = bp->c_next;
                        bp->c_next = cfreelist;
                        cfreelist = bp;
                        bp = bp->c_next;
                        bp->c_next = cfreelist;
                        cfreelist = bp;

+                       cfreecount += CBSIZE;

                        obp->c_next = NULL;
                }
        }
                        obp->c_next = NULL;
                }
        }


@@ -347,33 +498,10 @@ struct clist *from, *to;
                (void) putc(c, to);
 }
 
                (void) putc(c, to);
 }
 

-/*
- * Initialize clist by freeing all character blocks, then count
- * number of character devices. (Once-only routine)
- */
-cinit()
-{
-       register int ccp;
-       register struct cblock *cp;
-       register struct cdevsw *cdp;
-
-       ccp = (int)cfree;
-       ccp = (ccp+CROUND) & ~CROUND;
-       for(cp=(struct cblock *)ccp; cp <= &cfree[NCLIST-1]; cp++) {
-               cp->c_next = cfreelist;
-               cfreelist = cp;
-       }
-       ccp = 0;
-       for(cdp = cdevsw; cdp->d_open; cdp++)
-               ccp++;
-       nchrdev = ccp;
-}
-

 /*
  * integer (2-byte) get/put
  * using clists
  */
 /*
  * integer (2-byte) get/put
  * using clists
  */

-/*

 getw(p)
 register struct clist *p;
 {
 getw(p)
 register struct clist *p;
 {


@@ -384,7 +512,19 @@ register struct clist *p;
        s = getc(p);
        return(s | (getc(p)<<8));
 }
        s = getc(p);
        return(s | (getc(p)<<8));
 }

-*/
+
+#if HAVTR > 0
+trgetw(p)
+register struct clist *p;
+{
+       register int w;
+
+       if (p->c_cc <=1)
+               return(-1);
+       w = trgetc(p);
+       return(w | (trgetc(p)<<8));
+}
+#endif

 
 putw(c, p)
 register struct clist *p;
 
 putw(c, p)
 register struct clist *p;