The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/dcons/dcons.c

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    1 /*-
    2  * Copyright (C) 2003,2004
    3  *      Hidetoshi Shimokawa. All rights reserved.
    4  * 
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *
   16  *      This product includes software developed by Hidetoshi Shimokawa.
   17  *
   18  * 4. Neither the name of the author nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  * 
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  * 
   34  * $Id: dcons.c,v 1.65 2003/10/24 03:24:55 simokawa Exp $
   35  * $FreeBSD: releng/11.0/sys/dev/dcons/dcons.c 277505 2015-01-21 19:53:52Z will $
   36  */
   37 
   38 #include <sys/param.h>
   39 
   40 #if defined(_BOOT)
   41 #include "dcons.h"
   42 #include "stand.h"
   43 #else
   44 #include <dev/dcons/dcons.h>
   45 #endif
   46 
   47 int
   48 dcons_ischar(struct dcons_softc *dc)
   49 {
   50         u_int32_t ptr, pos, gen, next_gen;
   51         struct dcons_ch *ch;
   52 
   53         ch = &dc->i;
   54 
   55         ptr = ntohl(*ch->ptr);
   56         gen = ptr >> DCONS_GEN_SHIFT;
   57         pos = ptr & DCONS_POS_MASK;
   58         if (gen == ch->gen && pos == ch->pos)
   59                 return (0);
   60 
   61         next_gen = DCONS_NEXT_GEN(ch->gen);
   62         /* XXX sanity check */
   63         if ((gen != ch->gen && gen != next_gen)
   64                         || (gen == ch->gen && pos < ch->pos)) {
   65                 /* generation skipped !! */
   66                 /* XXX discard */
   67                 ch->gen = gen;
   68                 ch->pos = pos;
   69                 return (0);
   70         }
   71 
   72         return (1);
   73 }
   74 
   75 int
   76 dcons_checkc(struct dcons_softc *dc)
   77 {
   78         unsigned char c;
   79         u_int32_t ptr, pos, gen, next_gen;
   80         struct dcons_ch *ch;
   81 
   82         ch = &dc->i;
   83 
   84         ptr = ntohl(*ch->ptr);
   85         gen = ptr >> DCONS_GEN_SHIFT;
   86         pos = ptr & DCONS_POS_MASK;
   87         if (gen == ch->gen && pos == ch->pos)
   88                 return (-1);
   89 
   90         next_gen = DCONS_NEXT_GEN(ch->gen);
   91         /* XXX sanity check */
   92         if ((gen != ch->gen && gen != next_gen)
   93                         || (gen == ch->gen && pos < ch->pos)) {
   94                 /* generation skipped !! */
   95                 /* XXX discard */
   96                 ch->gen = gen;
   97                 ch->pos = pos;
   98                 return (-1);
   99         }
  100 
  101         c = ch->buf[ch->pos];
  102         ch->pos ++;
  103         if (ch->pos >= ch->size) {
  104                 ch->gen = next_gen;
  105                 ch->pos = 0;
  106         }
  107 
  108         return (c);
  109 }
  110 
  111 void
  112 dcons_putc(struct dcons_softc *dc, int c)
  113 {
  114         struct dcons_ch *ch;
  115 
  116         ch = &dc->o;
  117 
  118         ch->buf[ch->pos] = c;
  119         ch->pos ++;
  120         if (ch->pos >= ch->size) {
  121                 ch->gen = DCONS_NEXT_GEN(ch->gen);
  122                 ch->pos = 0;
  123         }
  124         *ch->ptr = DCONS_MAKE_PTR(ch);
  125 }
  126 
  127 static int
  128 dcons_init_port(int port, int offset, int size, struct dcons_buf *buf,
  129     struct dcons_softc *sc)
  130 {
  131         int osize;
  132         struct dcons_softc *dc;
  133 
  134         dc = &sc[port];
  135 
  136         osize = size * 3 / 4;
  137 
  138         dc->o.size = osize;
  139         dc->i.size = size - osize;
  140         dc->o.buf = (char *)buf + offset;
  141         dc->i.buf = dc->o.buf + osize;
  142         dc->o.gen = dc->i.gen = 0;
  143         dc->o.pos = dc->i.pos = 0;
  144         dc->o.ptr = &buf->optr[port];
  145         dc->i.ptr = &buf->iptr[port];
  146         dc->brk_state = STATE0;
  147         buf->osize[port] = htonl(osize);
  148         buf->isize[port] = htonl(size - osize);
  149         buf->ooffset[port] = htonl(offset);
  150         buf->ioffset[port] = htonl(offset + osize);
  151         buf->optr[port] = DCONS_MAKE_PTR(&dc->o);
  152         buf->iptr[port] = DCONS_MAKE_PTR(&dc->i);
  153 
  154         return(0);
  155 }
  156 
  157 int
  158 dcons_load_buffer(struct dcons_buf *buf, int size, struct dcons_softc *sc)
  159 {
  160         int port, s;
  161         struct dcons_softc *dc;
  162 
  163         if (buf->version != htonl(DCONS_VERSION))
  164                 return (-1);
  165 
  166         s = DCONS_HEADER_SIZE;
  167         for (port = 0; port < DCONS_NPORT; port ++) {
  168                 dc = &sc[port];
  169                 dc->o.size = ntohl(buf->osize[port]);
  170                 dc->i.size = ntohl(buf->isize[port]);
  171                 dc->o.buf = (char *)buf + ntohl(buf->ooffset[port]);
  172                 dc->i.buf = (char *)buf + ntohl(buf->ioffset[port]);
  173                 dc->o.gen = ntohl(buf->optr[port]) >> DCONS_GEN_SHIFT;
  174                 dc->i.gen = ntohl(buf->iptr[port]) >> DCONS_GEN_SHIFT;
  175                 dc->o.pos = ntohl(buf->optr[port]) & DCONS_POS_MASK;
  176                 dc->i.pos = ntohl(buf->iptr[port]) & DCONS_POS_MASK;
  177                 dc->o.ptr = &buf->optr[port];
  178                 dc->i.ptr = &buf->iptr[port];
  179                 dc->brk_state = STATE0;
  180 
  181                 s += dc->o.size + dc->i.size;
  182         }
  183 
  184         /* sanity check */
  185         if (s > size)
  186                 return (-1);
  187 
  188         buf->magic = ntohl(DCONS_MAGIC);
  189 
  190         return (0);
  191 }
  192 
  193 void
  194 dcons_init(struct dcons_buf *buf, int size, struct dcons_softc *sc)
  195 {
  196         int size0, size1, offset;
  197 
  198         offset = DCONS_HEADER_SIZE;
  199         size0 = (size - offset);
  200         size1 = size0 * 3 / 4;          /* console port buffer */
  201 
  202         dcons_init_port(0, offset, size1, buf, sc);
  203         offset += size1;
  204         dcons_init_port(1, offset, size0 - size1, buf, sc);
  205         buf->version = htonl(DCONS_VERSION);
  206         buf->magic = ntohl(DCONS_MAGIC);
  207 }

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