190 lines
5.4 KiB
C
190 lines
5.4 KiB
C
/* $NetBSD: cmos.c,v 1.9 2011/07/01 18:11:24 dyoung Exp $ */
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/*
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* Copyright (C) 2003 JONE System Co., Inc.
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* All right reserved.
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*
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* Copyright (C) 1999, 2000, 2001, 2002 JEPRO Co., Ltd.
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* All right reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* Copyright (c) 2007 David Young. All right reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: cmos.c,v 1.9 2011/07/01 18:11:24 dyoung Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/ioctl.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/kauth.h>
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#include <sys/bus.h>
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#include <machine/intr.h>
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#include <dev/isa/isareg.h>
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#include <dev/isa/isavar.h>
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#include <dev/ic/mc146818reg.h>
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#include <i386/isa/nvram.h>
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#define CMOS_SUM 32
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#define CMOS_BIOSSPEC 34 /* start of BIOS-specific configuration data */
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#define NVRAM_SUM (MC_NVRAM_START + CMOS_SUM)
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#define NVRAM_BIOSSPEC (MC_NVRAM_START + CMOS_BIOSSPEC)
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#define CMOS_SIZE NVRAM_BIOSSPEC
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void cmosattach(int);
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dev_type_open(cmos_open);
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dev_type_read(cmos_read);
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dev_type_write(cmos_write);
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static void cmos_sum(uint8_t *, int, int, int);
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const struct cdevsw cmos_cdevsw = {
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.d_open = cmos_open, .d_close = nullclose, .d_read = cmos_read,
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.d_write = cmos_write, .d_ioctl = noioctl,
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.d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap,
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.d_kqfilter = nokqfilter, .d_flag = D_OTHER | D_MPSAFE
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};
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static kmutex_t cmos_lock;
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static uint8_t cmos_buf[CMOS_SIZE];
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void
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cmosattach(int n)
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{
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mutex_init(&cmos_lock, MUTEX_DEFAULT, IPL_NONE);
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}
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int
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cmos_open(dev_t dev, int flags, int ifmt, struct lwp *l)
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{
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return kauth_authorize_machdep(kauth_cred_get(),
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KAUTH_MACHDEP_NVRAM, NULL, NULL, NULL, NULL);
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}
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static void
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cmos_fetch(void)
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{
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int i, s;
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uint8_t *p;
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p = cmos_buf;
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s = splclock();
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for (i = 0; i < CMOS_SIZE; i++)
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*p++ = mc146818_read(NULL, i);
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splx(s);
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}
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int
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cmos_read(dev_t dev, struct uio *uio, int ioflag)
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{
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int error;
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if (uio->uio_offset + uio->uio_resid > CMOS_SIZE)
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return EINVAL;
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mutex_enter(&cmos_lock);
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cmos_fetch();
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error = uiomove(cmos_buf + uio->uio_offset, uio->uio_resid, uio);
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mutex_exit(&cmos_lock);
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return error;
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}
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int
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cmos_write(dev_t dev, struct uio *uio, int ioflag)
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{
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int error = 0, i, s;
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if (uio->uio_offset + uio->uio_resid > CMOS_SIZE)
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return EINVAL;
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mutex_enter(&cmos_lock);
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cmos_fetch();
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error = uiomove(cmos_buf + uio->uio_offset, uio->uio_resid, uio);
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if (error == 0) {
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cmos_sum(cmos_buf, NVRAM_DISKETTE, NVRAM_SUM, NVRAM_SUM);
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s = splclock();
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for (i = NVRAM_DISKETTE; i < CMOS_SIZE; i++)
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mc146818_write(NULL, i, cmos_buf[i]);
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splx(s);
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}
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mutex_exit(&cmos_lock);
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return error;
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}
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static void
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cmos_sum(uint8_t *p, int from, int to, int offset)
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{
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int i;
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uint16_t sum;
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#ifdef CMOS_DEBUG
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printf("%s: from %d to %d and store %d\n", __func__, from, to, offset);
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#endif
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sum = 0;
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for (i = from; i < to; i++)
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sum += p[i];
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p[offset] = sum >> 8;
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p[offset + 1] = sum & 0xff;
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}
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