209 lines
5.3 KiB
C
209 lines
5.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (C) 2003,2004
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* Hidetoshi Shimokawa. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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*
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* This product includes software developed by Hidetoshi Shimokawa.
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*
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* 4. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: dcons.c,v 1.65 2003/10/24 03:24:55 simokawa Exp $
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*/
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#include <sys/param.h>
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#if defined(_BOOT)
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#include "dcons.h"
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#include "stand.h"
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#else
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#include <dev/dcons/dcons.h>
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#endif
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int
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dcons_ischar(struct dcons_softc *dc)
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{
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u_int32_t ptr, pos, gen, next_gen;
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struct dcons_ch *ch;
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ch = &dc->i;
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ptr = ntohl(*ch->ptr);
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gen = ptr >> DCONS_GEN_SHIFT;
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pos = ptr & DCONS_POS_MASK;
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if (gen == ch->gen && pos == ch->pos)
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return (0);
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next_gen = DCONS_NEXT_GEN(ch->gen);
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/* XXX sanity check */
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if ((gen != ch->gen && gen != next_gen)
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|| (gen == ch->gen && pos < ch->pos)) {
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/* generation skipped !! */
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/* XXX discard */
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ch->gen = gen;
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ch->pos = pos;
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return (0);
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}
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return (1);
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}
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int
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dcons_checkc(struct dcons_softc *dc)
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{
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unsigned char c;
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u_int32_t ptr, pos, gen, next_gen;
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struct dcons_ch *ch;
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ch = &dc->i;
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ptr = ntohl(*ch->ptr);
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gen = ptr >> DCONS_GEN_SHIFT;
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pos = ptr & DCONS_POS_MASK;
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if (gen == ch->gen && pos == ch->pos)
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return (-1);
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next_gen = DCONS_NEXT_GEN(ch->gen);
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/* XXX sanity check */
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if ((gen != ch->gen && gen != next_gen)
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|| (gen == ch->gen && pos < ch->pos)) {
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/* generation skipped !! */
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/* XXX discard */
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ch->gen = gen;
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ch->pos = pos;
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return (-1);
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}
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c = ch->buf[ch->pos];
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ch->pos ++;
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if (ch->pos >= ch->size) {
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ch->gen = next_gen;
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ch->pos = 0;
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}
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return (c);
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}
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void
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dcons_putc(struct dcons_softc *dc, int c)
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{
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struct dcons_ch *ch;
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ch = &dc->o;
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ch->buf[ch->pos] = c;
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ch->pos ++;
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if (ch->pos >= ch->size) {
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ch->gen = DCONS_NEXT_GEN(ch->gen);
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ch->pos = 0;
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}
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*ch->ptr = DCONS_MAKE_PTR(ch);
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}
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static int
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dcons_init_port(int port, int offset, int size, struct dcons_buf *buf,
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struct dcons_softc *sc)
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{
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int osize;
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struct dcons_softc *dc;
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dc = &sc[port];
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osize = size * 3 / 4;
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dc->o.size = osize;
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dc->i.size = size - osize;
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dc->o.buf = (char *)buf + offset;
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dc->i.buf = dc->o.buf + osize;
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dc->o.gen = dc->i.gen = 0;
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dc->o.pos = dc->i.pos = 0;
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dc->o.ptr = &buf->optr[port];
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dc->i.ptr = &buf->iptr[port];
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dc->brk_state = STATE0;
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buf->osize[port] = htonl(osize);
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buf->isize[port] = htonl(size - osize);
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buf->ooffset[port] = htonl(offset);
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buf->ioffset[port] = htonl(offset + osize);
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buf->optr[port] = DCONS_MAKE_PTR(&dc->o);
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buf->iptr[port] = DCONS_MAKE_PTR(&dc->i);
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return(0);
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}
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int
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dcons_load_buffer(struct dcons_buf *buf, int size, struct dcons_softc *sc)
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{
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int port, s;
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struct dcons_softc *dc;
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if (buf->version != htonl(DCONS_VERSION))
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return (-1);
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s = DCONS_HEADER_SIZE;
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for (port = 0; port < DCONS_NPORT; port ++) {
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dc = &sc[port];
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dc->o.size = ntohl(buf->osize[port]);
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dc->i.size = ntohl(buf->isize[port]);
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dc->o.buf = (char *)buf + ntohl(buf->ooffset[port]);
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dc->i.buf = (char *)buf + ntohl(buf->ioffset[port]);
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dc->o.gen = ntohl(buf->optr[port]) >> DCONS_GEN_SHIFT;
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dc->i.gen = ntohl(buf->iptr[port]) >> DCONS_GEN_SHIFT;
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dc->o.pos = ntohl(buf->optr[port]) & DCONS_POS_MASK;
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dc->i.pos = ntohl(buf->iptr[port]) & DCONS_POS_MASK;
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dc->o.ptr = &buf->optr[port];
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dc->i.ptr = &buf->iptr[port];
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dc->brk_state = STATE0;
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s += dc->o.size + dc->i.size;
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}
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/* sanity check */
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if (s > size)
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return (-1);
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buf->magic = ntohl(DCONS_MAGIC);
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return (0);
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}
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void
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dcons_init(struct dcons_buf *buf, int size, struct dcons_softc *sc)
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{
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int size0, size1, offset;
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offset = DCONS_HEADER_SIZE;
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size0 = (size - offset);
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size1 = size0 * 3 / 4; /* console port buffer */
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dcons_init_port(0, offset, size1, buf, sc);
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offset += size1;
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dcons_init_port(1, offset, size0 - size1, buf, sc);
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buf->version = htonl(DCONS_VERSION);
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buf->magic = ntohl(DCONS_MAGIC);
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}
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