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