cmos.c revision 1.4
1 /* $NetBSD: cmos.c,v 1.4 2008/06/28 14:56:22 ad Exp $ */ 2 3 /* 4 * Copyright (C) 2003 JONE System Co., Inc. 5 * All right reserved. 6 * 7 * Copyright (C) 1999, 2000, 2001, 2002 JEPRO Co., Ltd. 8 * All right reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 */ 33 /* 34 * Copyright (c) 2007 David Young. All right reserved. 35 * 36 * Redistribution and use in source and binary forms, with or 37 * without modification, are permitted provided that the following 38 * conditions are met: 39 * 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above 43 * copyright notice, this list of conditions and the following 44 * disclaimer in the documentation and/or other materials provided 45 * with the distribution. 46 * 3. The name of David Young may not be used to endorse or promote 47 * products derived from this software without specific prior 48 * written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 51 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 52 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 53 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 55 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 56 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 57 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 60 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: cmos.c,v 1.4 2008/06/28 14:56:22 ad Exp $"); 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/kernel.h> 70 #include <sys/malloc.h> 71 #include <sys/ioctl.h> 72 #include <sys/proc.h> 73 #include <sys/device.h> 74 #include <sys/conf.h> 75 #include <sys/kauth.h> 76 77 #include <machine/bus.h> 78 #include <machine/intr.h> 79 80 #include <dev/isa/isareg.h> 81 #include <dev/isa/isavar.h> 82 #include <dev/ic/mc146818reg.h> 83 #include <i386/isa/nvram.h> 84 85 #define CMOS_SUM 32 86 #define CMOS_BIOSSPEC 34 /* start of BIOS-specific configuration data */ 87 88 #define NVRAM_SUM (MC_NVRAM_START + CMOS_SUM) 89 #define NVRAM_BIOSSPEC (MC_NVRAM_START + CMOS_BIOSSPEC) 90 91 #define CMOS_SIZE NVRAM_BIOSSPEC 92 93 struct cmos_softc { /* driver status information */ 94 int sc_open; 95 uint8_t sc_buf[CMOS_SIZE]; 96 } cmos_softc; 97 98 #ifdef CMOS_DEBUG 99 int cmos_debug = 0; 100 #endif 101 102 void cmosattach(int); 103 dev_type_open(cmos_open); 104 dev_type_close(cmos_close); 105 dev_type_read(cmos_read); 106 dev_type_write(cmos_write); 107 108 static void cmos_sum(uint8_t *, int, int, int); 109 #ifdef CMOS_DEBUG 110 static void cmos_dump(uint8_t *); 111 #endif 112 113 const struct cdevsw cmos_cdevsw = { 114 .d_open = cmos_open, .d_close = cmos_close, .d_read = cmos_read, 115 .d_write = cmos_write, .d_ioctl = noioctl, 116 .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, 117 .d_kqfilter = nokqfilter, 118 }; 119 120 void 121 cmosattach(int n) 122 { 123 124 } 125 126 int 127 cmos_open(dev_t dev, int flags, int ifmt, struct lwp *l) 128 { 129 struct cmos_softc *sc = &cmos_softc; 130 struct proc *p = l->l_proc; 131 int error; 132 133 error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, 134 &p->p_acflag); 135 136 if (error != 0) 137 return error; 138 139 sc->sc_open = 1; 140 #ifdef CMOS_DEBUG 141 printf("cmos: opened\n"); 142 #endif 143 return 0; 144 } 145 146 int 147 cmos_close(dev_t dev, int flags, int ifmt, struct lwp *l) 148 { 149 struct cmos_softc *sc = &cmos_softc; 150 151 sc->sc_open = 0; 152 #ifdef CMOS_DEBUG 153 printf("cmos: closed\n"); 154 #endif 155 return 0; 156 } 157 158 static void 159 cmos_fetch(struct cmos_softc *sc) 160 { 161 int i, s; 162 uint8_t *p; 163 164 p = sc->sc_buf; 165 166 s = splclock(); 167 for (i = 0; i < CMOS_SIZE; i++) 168 *p++ = mc146818_read(sc, i); 169 splx(s); 170 } 171 172 int 173 cmos_read(dev_t dev, struct uio *uio, int ioflag) 174 { 175 struct cmos_softc *sc = &cmos_softc; 176 177 if (uio->uio_resid > CMOS_SIZE) 178 return EINVAL; 179 180 #ifdef CMOS_DEBUG 181 printf("cmos: try to read to %d\n", CMOS_SIZE); 182 #endif 183 cmos_fetch(sc); 184 185 return uiomove(sc->sc_buf, CMOS_SIZE, uio); 186 } 187 188 int 189 cmos_write(dev_t dev, struct uio *uio, int ioflag) 190 { 191 struct cmos_softc *sc = &cmos_softc; 192 int error = 0, i, s; 193 194 cmos_fetch(sc); 195 196 error = uiomove(sc->sc_buf, CMOS_SIZE, uio); 197 #ifdef CMOS_DEBUG 198 printf("write %d\n", l); 199 if (cmos_debug) 200 cmos_dump(sc->sc_buf); 201 #endif 202 if (error) 203 return error; 204 205 cmos_sum(sc->sc_buf, NVRAM_DISKETTE, NVRAM_SUM, NVRAM_SUM); 206 207 #ifdef CMOS_DEBUG 208 if (cmos_debug) 209 cmos_dump(sc->sc_buf); 210 #endif 211 s = splclock(); 212 for (i = NVRAM_DISKETTE; i < CMOS_SIZE; i++) 213 mc146818_write(sc, i, sc->sc_buf[i]); 214 splx(s); 215 216 return error; 217 } 218 219 static void 220 cmos_sum(uint8_t *p, int from, int to, int offset) 221 { 222 int i; 223 uint16_t sum; 224 225 #ifdef CMOS_DEBUG 226 printf("%s: from %d to %d and store %d\n", __func__, from, to, offset); 227 #endif 228 229 sum = 0; 230 for (i = from; i < to; i++) 231 sum += p[i]; 232 p[offset] = sum >> 8; 233 p[offset + 1] = sum & 0xff; 234 } 235 236 #ifdef CMOS_DEBUG 237 static void 238 cmos_dump(uint8_t *p) 239 { 240 int i; 241 242 for (i = 0; i < CMOS_SIZE; i++) { 243 if (i % 16 == 0) 244 printf("%02x:", i); 245 printf(" %02x", p[i]); 246 if (i % 16 == 15) 247 printf("\n", buf); 248 } 249 printf("\n"); 250 } 251 #endif 252
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