1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (C) 2003,2004 5 * Hidetoshi Shimokawa. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * 18 * This product includes software developed by Hidetoshi Shimokawa. 19 * 20 * 4. Neither the name of the author nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $Id: dcons.c,v 1.65 2003/10/24 03:24:55 simokawa Exp $ 37 * $FreeBSD$ 38 */ 39 40 #include <sys/param.h> 41 42 #if defined(_BOOT) 43 #include "dcons.h" 44 #include "stand.h" 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 } 210