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(_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 } 208