/* $NetBSD: cmos.c,v 1.14 2023/12/20 15:00:07 thorpej Exp $ */ /* * Copyright (C) 2003 JONE System Co., Inc. * All right reserved. * * Copyright (C) 1999, 2000, 2001, 2002 JEPRO Co., Ltd. * All right reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ /* * Copyright (c) 2007 David Young. All right reserved. * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: cmos.c,v 1.14 2023/12/20 15:00:07 thorpej Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/ioctl.h> #include <sys/proc.h> #include <sys/device.h> #include <sys/conf.h> #include <sys/kauth.h> #include <sys/bus.h> #include <machine/intr.h> #include <dev/isa/isareg.h> #include <dev/isa/isavar.h> #include <dev/ic/mc146818reg.h> #include <i386/isa/nvram.h> #include "ioconf.h" #define CMOS_SUM 32 #define CMOS_BIOSSPEC 34 /* start of BIOS-specific configuration data */ #define NVRAM_SUM (MC_NVRAM_START + CMOS_SUM) #define NVRAM_BIOSSPEC (MC_NVRAM_START + CMOS_BIOSSPEC) #define CMOS_SIZE NVRAM_BIOSSPEC dev_type_open(cmos_open); dev_type_read(cmos_read); dev_type_write(cmos_write); static void cmos_sum(uint8_t *, int, int, int); const struct cdevsw cmos_cdevsw = { .d_open = cmos_open, .d_close = nullclose, .d_read = cmos_read, .d_write = cmos_write, .d_ioctl = noioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = D_OTHER | D_MPSAFE }; static kmutex_t cmos_lock; static uint8_t cmos_buf[CMOS_SIZE]; void cmosattach(int n) { mutex_init(&cmos_lock, MUTEX_DEFAULT, IPL_NONE); } int cmos_open(dev_t dev, int flags, int ifmt, struct lwp *l) { return kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_NVRAM, NULL, NULL, NULL, NULL); } static void cmos_fetch(void) { int i, s; uint8_t *p; p = cmos_buf; s = splclock(); for (i = 0; i < CMOS_SIZE; i++) *p++ = mc146818_read(NULL, i); splx(s); } int cmos_read(dev_t dev, struct uio *uio, int ioflag) { int error; if (uio->uio_offset + uio->uio_resid > CMOS_SIZE) return EINVAL; mutex_enter(&cmos_lock); cmos_fetch(); error = uiomove(cmos_buf + uio->uio_offset, uio->uio_resid, uio); mutex_exit(&cmos_lock); return error; } int cmos_write(dev_t dev, struct uio *uio, int ioflag) { int error = 0, i, s; if (uio->uio_offset + uio->uio_resid > CMOS_SIZE) return EINVAL; mutex_enter(&cmos_lock); cmos_fetch(); error = uiomove(cmos_buf + uio->uio_offset, uio->uio_resid, uio); if (error == 0) { cmos_sum(cmos_buf, NVRAM_DISKETTE, NVRAM_SUM, NVRAM_SUM); s = splclock(); for (i = NVRAM_DISKETTE; i < CMOS_SIZE; i++) mc146818_write(NULL, i, cmos_buf[i]); splx(s); } mutex_exit(&cmos_lock); return error; } static void cmos_sum(uint8_t *p, int from, int to, int offset) { int i; uint16_t sum; #ifdef CMOS_DEBUG printf("%s: from %d to %d and store %d\n", __func__, from, to, offset); #endif sum = 0; for (i = from; i < to; i++) sum += p[i]; p[offset] = sum >> 8; p[offset + 1] = sum & 0xff; }
