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/6.3/sys/dev/dcons/dcons.c 170046 2007-05-28 04:31:23Z simokawa $
   36  */
   37 
   38 #include <sys/param.h>
   39 
   40 #if defined(__DragonFly__) || defined(_BOOT)
   41 #include "dcons.h"
   42 #if defined(_BOOT)
   43 #include "stand.h"
   44 #endif
   45 #else
   46 #include <dev/dcons/dcons.h>
   47 #endif
   48 
   49 int
   50 dcons_ischar(struct dcons_softc *dc)
   51 {
   52         u_int32_t ptr, pos, gen, next_gen;
   53         struct dcons_ch *ch;
   54 
   55         ch = &dc->i;
   56 
   57         ptr = ntohl(*ch->ptr);
   58         gen = ptr >> DCONS_GEN_SHIFT;
   59         pos = ptr & DCONS_POS_MASK;
   60         if (gen == ch->gen && pos == ch->pos)
   61                 return (0);
   62 
   63         next_gen = DCONS_NEXT_GEN(ch->gen);
   64         /* XXX sanity check */
   65         if ((gen != ch->gen && gen != next_gen)
   66                         || (gen == ch->gen && pos < ch->pos)) {
   67                 /* generation skipped !! */
   68                 /* XXX discard */
   69                 ch->gen = gen;
   70                 ch->pos = pos;
   71                 return (0);
   72         }
   73 
   74         return (1);
   75 }
   76 
   77 int
   78 dcons_checkc(struct dcons_softc *dc)
   79 {
   80         unsigned char c;
   81         u_int32_t ptr, pos, gen, next_gen;
   82         struct dcons_ch *ch;
   83 
   84         ch = &dc->i;
   85 
   86         ptr = ntohl(*ch->ptr);
   87         gen = ptr >> DCONS_GEN_SHIFT;
   88         pos = ptr & DCONS_POS_MASK;
   89         if (gen == ch->gen && pos == ch->pos)
   90                 return (-1);
   91 
   92         next_gen = DCONS_NEXT_GEN(ch->gen);
   93         /* XXX sanity check */
   94         if ((gen != ch->gen && gen != next_gen)
   95                         || (gen == ch->gen && pos < ch->pos)) {
   96                 /* generation skipped !! */
   97                 /* XXX discard */
   98                 ch->gen = gen;
   99                 ch->pos = pos;
  100                 return (-1);
  101         }
  102 
  103         c = ch->buf[ch->pos];
  104         ch->pos ++;
  105         if (ch->pos >= ch->size) {
  106                 ch->gen = next_gen;
  107                 ch->pos = 0;
  108         }
  109 
  110         return (c);
  111 }
  112 
  113 void
  114 dcons_putc(struct dcons_softc *dc, int c)
  115 {
  116         struct dcons_ch *ch;
  117 
  118         ch = &dc->o;
  119 
  120         ch->buf[ch->pos] = c;
  121         ch->pos ++;
  122         if (ch->pos >= ch->size) {
  123                 ch->gen = DCONS_NEXT_GEN(ch->gen);
  124                 ch->pos = 0;
  125         }
  126         *ch->ptr = DCONS_MAKE_PTR(ch);
  127 }
  128 
  129 static int
  130 dcons_init_port(int port, int offset, int size, struct dcons_buf *buf,
  131     struct dcons_softc *sc)
  132 {
  133         int osize;
  134         struct dcons_softc *dc;
  135 
  136         dc = &sc[port];
  137 
  138         osize = size * 3 / 4;
  139 
  140         dc->o.size = osize;
  141         dc->i.size = size - osize;
  142         dc->o.buf = (char *)buf + offset;
  143         dc->i.buf = dc->o.buf + osize;
  144         dc->o.gen = dc->i.gen = 0;
  145         dc->o.pos = dc->i.pos = 0;
  146         dc->o.ptr = &buf->optr[port];
  147         dc->i.ptr = &buf->iptr[port];
  148         dc->brk_state = STATE0;
  149         buf->osize[port] = htonl(osize);
  150         buf->isize[port] = htonl(size - osize);
  151         buf->ooffset[port] = htonl(offset);
  152         buf->ioffset[port] = htonl(offset + osize);
  153         buf->optr[port] = DCONS_MAKE_PTR(&dc->o);
  154         buf->iptr[port] = DCONS_MAKE_PTR(&dc->i);
  155 
  156         return(0);
  157 }
  158 
  159 int
  160 dcons_load_buffer(struct dcons_buf *buf, int size, struct dcons_softc *sc)
  161 {
  162         int port, s;
  163         struct dcons_softc *dc;
  164 
  165         if (buf->version != htonl(DCONS_VERSION))
  166                 return (-1);
  167 
  168         s = DCONS_HEADER_SIZE;
  169         for (port = 0; port < DCONS_NPORT; port ++) {
  170                 dc = &sc[port];
  171                 dc->o.size = ntohl(buf->osize[port]);
  172                 dc->i.size = ntohl(buf->isize[port]);
  173                 dc->o.buf = (char *)buf + ntohl(buf->ooffset[port]);
  174                 dc->i.buf = (char *)buf + ntohl(buf->ioffset[port]);
  175                 dc->o.gen = ntohl(buf->optr[port]) >> DCONS_GEN_SHIFT;
  176                 dc->i.gen = ntohl(buf->iptr[port]) >> DCONS_GEN_SHIFT;
  177                 dc->o.pos = ntohl(buf->optr[port]) & DCONS_POS_MASK;
  178                 dc->i.pos = ntohl(buf->iptr[port]) & DCONS_POS_MASK;
  179                 dc->o.ptr = &buf->optr[port];
  180                 dc->i.ptr = &buf->iptr[port];
  181                 dc->brk_state = STATE0;
  182 
  183                 s += dc->o.size + dc->i.size;
  184         }
  185 
  186         /* sanity check */
  187         if (s > size)
  188                 return (-1);
  189 
  190         buf->magic = ntohl(DCONS_MAGIC);
  191 
  192         return (0);
  193 }
  194 
  195 void
  196 dcons_init(struct dcons_buf *buf, int size, struct dcons_softc *sc)
  197 {
  198         int size0, size1, offset;
  199 
  200         offset = DCONS_HEADER_SIZE;
  201         size0 = (size - offset);
  202         size1 = size0 * 3 / 4;          /* console port buffer */
  203 
  204         dcons_init_port(0, offset, size1, buf, sc);
  205         offset += size1;
  206         dcons_init_port(1, offset, size0 - size1, buf, sc);
  207         buf->version = htonl(DCONS_VERSION);
  208         buf->magic = ntohl(DCONS_MAGIC);
  209 }

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