830 lines
22 KiB
C
830 lines
22 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
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* $Id: isa.c,v 1.13 1994/01/17 05:49:20 rgrimes Exp $
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*/
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/*
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* code to manage AT bus
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*
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* 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com):
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* Fixed uninitialized variable problem and added code to deal
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* with DMA page boundaries in isa_dmarangecheck(). Fixed word
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* mode DMA count compution and reorganized DMA setup code in
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* isa_dmastart()
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*/
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#include "param.h"
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#include "systm.h" /* isn't it a joy */
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#include "kernel.h" /* to have three of these */
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#include "conf.h"
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#include "file.h"
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#include "buf.h"
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#include "uio.h"
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#include "syslog.h"
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#include "malloc.h"
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#include "rlist.h"
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#include "machine/segments.h"
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#include "vm/vm.h"
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#include "i386/isa/isa_device.h"
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#include "i386/isa/isa.h"
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#include "i386/isa/icu.h"
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#include "i386/isa/ic/i8237.h"
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#include "i386/isa/ic/i8042.h"
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/*
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** Register definitions for DMA controller 1 (channels 0..3):
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*/
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#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */
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#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */
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#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */
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#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */
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/*
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** Register definitions for DMA controller 2 (channels 4..7):
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*/
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#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */
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#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */
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#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */
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#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */
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void config_isadev __P((struct isa_device *, u_int *));
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/*
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* print a conflict message
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*/
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void
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conflict(dvp, tmpdvp, item, reason, format)
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struct isa_device *dvp, *tmpdvp;
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int item;
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char *reason;
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char *format;
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{
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printf("%s%d not probed due to %s conflict with %s%d at ",
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dvp->id_driver->name, dvp->id_unit, reason,
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tmpdvp->id_driver->name, tmpdvp->id_unit);
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printf(format, item);
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printf("\n");
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}
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/*
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* Check to see if things are alread in use, like IRQ's, I/O addresses
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* and Memory addresses.
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*/
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int
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haveseen(dvp, tmpdvp)
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struct isa_device *dvp, *tmpdvp;
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{
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int status = 0;
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/*
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* Only check against devices that have already been found
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*/
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if (tmpdvp->id_alive) {
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/*
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* Check for I/O address conflict. We can only check the
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* starting address of the device against the range of the
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* device that has already been probed since we do not
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* know how many I/O addresses this device uses.
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*/
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if (tmpdvp->id_alive != -1) {
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if ((dvp->id_iobase >= tmpdvp->id_iobase) &&
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(dvp->id_iobase <=
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(tmpdvp->id_iobase + tmpdvp->id_alive - 1))) {
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conflict(dvp, tmpdvp, dvp->id_iobase,
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"I/O address", "0x%x");
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status = 1;
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}
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}
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/*
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* Check for Memory address conflict. We can check for
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* range overlap, but it will not catch all cases since the
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* driver may adjust the msize paramater during probe, for
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* now we just check that the starting address does not
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* fall within any allocated region.
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* XXX could add a second check after the probe for overlap,
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* since at that time we would know the full range.
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* XXX KERNBASE is a hack, we should have vaddr in the table!
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*/
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if(tmpdvp->id_maddr) {
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if((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) &&
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(KERNBASE + dvp->id_maddr <=
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(tmpdvp->id_maddr + tmpdvp->id_msize - 1))) {
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conflict(dvp, tmpdvp, dvp->id_maddr, "maddr",
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"0x%x");
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status = 1;
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}
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}
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#ifndef COM_MULTIPORT
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/*
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* Check for IRQ conflicts.
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*/
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if(tmpdvp->id_irq) {
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if (tmpdvp->id_irq == dvp->id_irq) {
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conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1,
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"irq", "%d");
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status = 1;
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}
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}
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#endif
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/*
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* Check for DRQ conflicts.
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*/
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if(tmpdvp->id_drq != -1) {
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if (tmpdvp->id_drq == dvp->id_drq) {
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conflict(dvp, tmpdvp, dvp->id_drq,
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"drq", "%d");
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status = 1;
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}
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}
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}
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return (status);
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}
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/*
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* Search through all the isa_devtab_* tables looking for anything that
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* conflicts with the current device.
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*/
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int
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haveseen_isadev(dvp)
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struct isa_device *dvp;
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{
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struct isa_device *tmpdvp;
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int status = 0;
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for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp);
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}
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for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp);
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}
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for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp);
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}
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for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp);
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}
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return(status);
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}
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/*
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* Configure all ISA devices
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*/
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void
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isa_configure() {
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struct isa_device *dvp;
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enable_intr();
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splhigh();
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INTREN(IRQ_SLAVE);
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printf("Probing for devices on the ISA bus:\n");
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for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) {
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if (!haveseen_isadev(dvp))
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config_isadev(dvp,&ttymask);
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}
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for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) {
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if (!haveseen_isadev(dvp))
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config_isadev(dvp,&biomask);
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}
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for (dvp = isa_devtab_net; dvp->id_driver; dvp++) {
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if (!haveseen_isadev(dvp))
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config_isadev(dvp,&netmask);
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}
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for (dvp = isa_devtab_null; dvp->id_driver; dvp++) {
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if (!haveseen_isadev(dvp))
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config_isadev(dvp,(u_int *) NULL);
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}
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/*
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* XXX We should really add the tty device to netmask when the line is
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* switched to SLIPDISC, and then remove it when it is switched away from
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* SLIPDISC. No need to block out ALL ttys during a splnet when only one
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* of them is running slip.
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*/
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#include "sl.h"
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#if NSL > 0
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netmask |= ttymask;
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ttymask |= netmask;
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#endif
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/* if netmask == 0, then the loopback code can do some really
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* bad things.
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*/
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if (netmask == 0)
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netmask = 0x10000;
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/* biomask |= ttymask ; can some tty devices use buffers? */
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printf("biomask %x ttymask %x netmask %x\n", biomask, ttymask, netmask);
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splnone();
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}
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/*
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* Configure an ISA device.
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*/
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void
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config_isadev(isdp, mp)
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struct isa_device *isdp;
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u_int *mp;
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{
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struct isa_driver *dp = isdp->id_driver;
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if (isdp->id_maddr) {
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extern u_int atdevbase;
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isdp->id_maddr -= 0xa0000; /* XXX should be a define */
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isdp->id_maddr += atdevbase;
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}
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isdp->id_alive = (*dp->probe)(isdp);
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if (isdp->id_alive) {
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/*
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* Only print the I/O address range if id_alive != -1
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* Right now this is a temporary fix just for the new
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* NPX code so that if it finds a 486 that can use trap
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* 16 it will not report I/O addresses.
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* Rod Grimes 04/26/94
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*/
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printf("%s%d", dp->name, isdp->id_unit);
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if (isdp->id_alive != -1) {
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printf(" at 0x%x", isdp->id_iobase);
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if ((isdp->id_iobase + isdp->id_alive - 1) !=
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isdp->id_iobase) {
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printf("-0x%x",
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isdp->id_iobase +
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isdp->id_alive - 1);
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}
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}
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if(isdp->id_irq)
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printf(" irq %d", ffs(isdp->id_irq) - 1);
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if (isdp->id_drq != -1)
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printf(" drq %d", isdp->id_drq);
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if (isdp->id_maddr)
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printf(" maddr 0x%x", kvtop(isdp->id_maddr));
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if (isdp->id_msize)
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printf(" msize %d", isdp->id_msize);
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if (isdp->id_flags)
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printf(" flags 0x%x", isdp->id_flags);
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if (isdp->id_iobase) {
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if (isdp->id_iobase < 0x100) {
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printf(" on motherboard\n");
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} else {
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if (isdp->id_iobase >= 0x1000) {
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printf (" on eisa\n");
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} else {
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printf (" on isa\n");
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}
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}
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}
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(*dp->attach)(isdp);
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if(isdp->id_irq) {
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int intrno;
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intrno = ffs(isdp->id_irq)-1;
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setidt(ICU_OFFSET+intrno, isdp->id_intr,
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SDT_SYS386IGT, SEL_KPL);
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if(mp) {
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INTRMASK(*mp,isdp->id_irq);
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}
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INTREN(isdp->id_irq);
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}
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} else {
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printf("%s%d not found", dp->name, isdp->id_unit);
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if (isdp->id_iobase) {
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printf(" at 0x%x", isdp->id_iobase);
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}
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printf("\n");
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}
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}
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#define IDTVEC(name) __CONCAT(X,name)
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/* default interrupt vector table entries */
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typedef void inthand_t();
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typedef void (*inthand_func_t)();
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extern inthand_t
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IDTVEC(intr0), IDTVEC(intr1), IDTVEC(intr2), IDTVEC(intr3),
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IDTVEC(intr4), IDTVEC(intr5), IDTVEC(intr6), IDTVEC(intr7),
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IDTVEC(intr8), IDTVEC(intr9), IDTVEC(intr10), IDTVEC(intr11),
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IDTVEC(intr12), IDTVEC(intr13), IDTVEC(intr14), IDTVEC(intr15);
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static inthand_func_t defvec[16] = {
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&IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3),
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&IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7),
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&IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11),
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&IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) };
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/* out of range default interrupt vector gate entry */
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extern inthand_t IDTVEC(intrdefault);
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/*
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* Fill in default interrupt table (in case of spuruious interrupt
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* during configuration of kernel, setup interrupt control unit
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*/
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void
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isa_defaultirq()
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{
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int i;
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/* icu vectors */
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for (i = NRSVIDT ; i < NRSVIDT+ICU_LEN ; i++)
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setidt(i, defvec[i], SDT_SYS386IGT, SEL_KPL);
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/* out of range vectors */
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for (i = NRSVIDT; i < NIDT; i++)
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setidt(i, &IDTVEC(intrdefault), SDT_SYS386IGT, SEL_KPL);
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/* initialize 8259's */
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outb(IO_ICU1, 0x11); /* reset; program device, four bytes */
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outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */
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outb(IO_ICU1+1, 1<<2); /* slave on line 2 */
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#ifdef AUTO_EOI_1
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outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */
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#else
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outb(IO_ICU1+1, 1); /* 8086 mode */
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#endif
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outb(IO_ICU1+1, 0xff); /* leave interrupts masked */
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outb(IO_ICU1, 0x0a); /* default to IRR on read */
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outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */
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outb(IO_ICU2, 0x11); /* reset; program device, four bytes */
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outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */
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outb(IO_ICU2+1,2); /* my slave id is 2 */
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#ifdef AUTO_EOI_2
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outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */
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#else
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outb(IO_ICU2+1,1); /* 8086 mode */
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#endif
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outb(IO_ICU2+1, 0xff); /* leave interrupts masked */
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outb(IO_ICU2, 0x0a); /* default to IRR on read */
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}
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/* region of physical memory known to be contiguous */
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vm_offset_t isaphysmem;
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static caddr_t dma_bounce[8]; /* XXX */
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static char bounced[8]; /* XXX */
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#define MAXDMASZ 512 /* XXX */
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/* high byte of address is stored in this port for i-th dma channel */
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static short dmapageport[8] =
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{ 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
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/*
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* isa_dmacascade(): program 8237 DMA controller channel to accept
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* external dma control by a board.
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*/
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void isa_dmacascade(unsigned chan)
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{
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if (chan > 7)
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panic("isa_dmacascade: impossible request");
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/* set dma channel mode, and set dma channel mode */
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if ((chan & 4) == 0) {
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outb(DMA1_MODE, DMA37MD_CASCADE | chan);
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outb(DMA1_SMSK, chan);
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} else {
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outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3));
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outb(DMA2_SMSK, chan & 3);
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}
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}
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/*
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* isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
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* problems by using a bounce buffer.
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*/
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void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan)
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{ vm_offset_t phys;
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int waport;
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caddr_t newaddr;
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if ( chan > 7
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|| (chan < 4 && nbytes > (1<<16))
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|| (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
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panic("isa_dmastart: impossible request");
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if (isa_dmarangecheck(addr, nbytes, chan)) {
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if (dma_bounce[chan] == 0)
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dma_bounce[chan] =
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/*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/
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(caddr_t) isaphysmem + NBPG*chan;
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bounced[chan] = 1;
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newaddr = dma_bounce[chan];
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*(int *) newaddr = 0; /* XXX */
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/* copy bounce buffer on write */
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if (!(flags & B_READ))
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bcopy(addr, newaddr, nbytes);
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addr = newaddr;
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}
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/* translate to physical */
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phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr);
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if ((chan & 4) == 0) {
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/*
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* Program one of DMA channels 0..3. These are
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* byte mode channels.
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*/
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/* set dma channel mode, and reset address ff */
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if (flags & B_READ)
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outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan);
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else
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outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan);
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outb(DMA1_FFC, 0);
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/* send start address */
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waport = DMA1_CHN(chan);
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outb(waport, phys);
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outb(waport, phys>>8);
|
|
outb(dmapageport[chan], phys>>16);
|
|
|
|
/* send count */
|
|
outb(waport + 1, --nbytes);
|
|
outb(waport + 1, nbytes>>8);
|
|
|
|
/* unmask channel */
|
|
outb(DMA1_SMSK, chan);
|
|
} else {
|
|
/*
|
|
* Program one of DMA channels 4..7. These are
|
|
* word mode channels.
|
|
*/
|
|
/* set dma channel mode, and reset address ff */
|
|
if (flags & B_READ)
|
|
outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3));
|
|
else
|
|
outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3));
|
|
outb(DMA2_FFC, 0);
|
|
|
|
/* send start address */
|
|
waport = DMA2_CHN(chan - 4);
|
|
outb(waport, phys>>1);
|
|
outb(waport, phys>>9);
|
|
outb(dmapageport[chan], phys>>16);
|
|
|
|
/* send count */
|
|
nbytes >>= 1;
|
|
outb(waport + 2, --nbytes);
|
|
outb(waport + 2, nbytes>>8);
|
|
|
|
/* unmask channel */
|
|
outb(DMA2_SMSK, chan & 3);
|
|
}
|
|
}
|
|
|
|
void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
|
|
{
|
|
|
|
/* copy bounce buffer on read */
|
|
/*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/
|
|
if (bounced[chan]) {
|
|
bcopy(dma_bounce[chan], addr, nbytes);
|
|
bounced[chan] = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check for problems with the address range of a DMA transfer
|
|
* (non-contiguous physical pages, outside of bus address space,
|
|
* crossing DMA page boundaries).
|
|
* Return true if special handling needed.
|
|
*/
|
|
|
|
int
|
|
isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) {
|
|
vm_offset_t phys, priorpage = 0, endva;
|
|
u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
|
|
|
|
endva = (vm_offset_t)round_page(va + length);
|
|
for (; va < (caddr_t) endva ; va += NBPG) {
|
|
phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va));
|
|
#define ISARAM_END RAM_END
|
|
if (phys == 0)
|
|
panic("isa_dmacheck: no physical page present");
|
|
if (phys > ISARAM_END)
|
|
return (1);
|
|
if (priorpage) {
|
|
if (priorpage + NBPG != phys)
|
|
return (1);
|
|
/* check if crossing a DMA page boundary */
|
|
if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk)
|
|
return (1);
|
|
}
|
|
priorpage = phys;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* head of queue waiting for physmem to become available */
|
|
struct buf isa_physmemq;
|
|
|
|
/* blocked waiting for resource to become free for exclusive use */
|
|
static isaphysmemflag;
|
|
/* if waited for and call requested when free (B_CALL) */
|
|
static void (*isaphysmemunblock)(); /* needs to be a list */
|
|
|
|
/*
|
|
* Allocate contiguous physical memory for transfer, returning
|
|
* a *virtual* address to region. May block waiting for resource.
|
|
* (assumed to be called at splbio())
|
|
*/
|
|
caddr_t
|
|
isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) {
|
|
|
|
isaphysmemunblock = func;
|
|
while (isaphysmemflag & B_BUSY) {
|
|
isaphysmemflag |= B_WANTED;
|
|
tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0);
|
|
}
|
|
isaphysmemflag |= B_BUSY;
|
|
|
|
return((caddr_t)isaphysmem);
|
|
}
|
|
|
|
/*
|
|
* Free contiguous physical memory used for transfer.
|
|
* (assumed to be called at splbio())
|
|
*/
|
|
void
|
|
isa_freephysmem(caddr_t va, unsigned length) {
|
|
|
|
isaphysmemflag &= ~B_BUSY;
|
|
if (isaphysmemflag & B_WANTED) {
|
|
isaphysmemflag &= B_WANTED;
|
|
wakeup((caddr_t)&isaphysmemflag);
|
|
if (isaphysmemunblock)
|
|
(*isaphysmemunblock)();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle a NMI, possibly a machine check.
|
|
* return true to panic system, false to ignore.
|
|
*/
|
|
int
|
|
isa_nmi(cd)
|
|
int cd;
|
|
{
|
|
|
|
log(LOG_CRIT, "\nNMI port 61 %x, port 70 %x\n", inb(0x61), inb(0x70));
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Caught a stray interrupt, notify
|
|
*/
|
|
void
|
|
isa_strayintr(d)
|
|
int d;
|
|
{
|
|
|
|
/* DON'T BOTHER FOR NOW! */
|
|
/* for some reason, we get bursts of intr #7, even if not enabled! */
|
|
/*
|
|
* Well the reason you got bursts of intr #7 is because someone
|
|
* raised an interrupt line and dropped it before the 8259 could
|
|
* prioritize it. This is documented in the intel data book. This
|
|
* means you have BAD hardware! I have changed this so that only
|
|
* the first 5 get logged, then it quits logging them, and puts
|
|
* out a special message. rgrimes 3/25/1993
|
|
*/
|
|
extern u_long intrcnt_stray;
|
|
|
|
intrcnt_stray++;
|
|
if (intrcnt_stray <= 5)
|
|
log(LOG_ERR,"ISA strayintr %x\n", d);
|
|
if (intrcnt_stray == 5)
|
|
log(LOG_CRIT,"Too many ISA strayintr not logging any more\n");
|
|
}
|
|
|
|
/*
|
|
* Wait "n" microseconds.
|
|
* Relies on timer 1 counting down from (TIMER_FREQ / hz) at
|
|
* (1 * TIMER_FREQ) Hz.
|
|
* Note: timer had better have been programmed before this is first used!
|
|
* (The standard programming causes the timer to generate a square wave and
|
|
* the counter is decremented twice every cycle.)
|
|
*/
|
|
#define CF (1 * TIMER_FREQ)
|
|
#define TIMER_FREQ 1193182 /* XXX - should be elsewhere */
|
|
|
|
void
|
|
DELAY(n)
|
|
int n;
|
|
{
|
|
int counter_limit;
|
|
int prev_tick;
|
|
int tick;
|
|
int ticks_left;
|
|
int sec;
|
|
int usec;
|
|
|
|
#ifdef DELAYDEBUG
|
|
int getit_calls = 1;
|
|
int n1;
|
|
static int state = 0;
|
|
|
|
if (state == 0) {
|
|
state = 1;
|
|
for (n1 = 1; n1 <= 10000000; n1 *= 10)
|
|
DELAY(n1);
|
|
state = 2;
|
|
}
|
|
if (state == 1)
|
|
printf("DELAY(%d)...", n);
|
|
#endif
|
|
|
|
/*
|
|
* Read the counter first, so that the rest of the setup overhead is
|
|
* counted. Guess the initial overhead is 20 usec (on most systems it
|
|
* takes about 1.5 usec for each of the i/o's in getit(). The loop
|
|
* takes about 6 usec on a 486/33 and 13 usec on a 386/20. The
|
|
* multiplications and divisions to scale the count take a while).
|
|
*/
|
|
prev_tick = getit(0, 0);
|
|
n -= 20;
|
|
|
|
/*
|
|
* Calculate (n * (CF / 1e6)) without using floating point and without
|
|
* any avoidable overflows.
|
|
*/
|
|
sec = n / 1000000;
|
|
usec = n - sec * 1000000;
|
|
ticks_left = sec * CF
|
|
+ usec * (CF / 1000000)
|
|
+ usec * ((CF % 1000000) / 1000) / 1000
|
|
+ usec * (CF % 1000) / 1000000;
|
|
|
|
counter_limit = TIMER_FREQ / hz;
|
|
while (ticks_left > 0) {
|
|
tick = getit(0, 0);
|
|
#ifdef DELAYDEBUG
|
|
++getit_calls;
|
|
#endif
|
|
if (tick > prev_tick)
|
|
ticks_left -= prev_tick - (tick - counter_limit);
|
|
else
|
|
ticks_left -= prev_tick - tick;
|
|
prev_tick = tick;
|
|
}
|
|
#ifdef DELAYDEBUG
|
|
if (state == 1)
|
|
printf(" %d calls to getit() at %d usec each\n",
|
|
getit_calls, (n + 5) / getit_calls);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
getit(unit, timer)
|
|
int unit;
|
|
int timer;
|
|
{
|
|
int high;
|
|
int low;
|
|
|
|
/*
|
|
* XXX - isa.h defines bogus timers. There's no such timer as
|
|
* IO_TIMER_2 = 0x48. There's a timer in the CMOS RAM chip but
|
|
* its interface is quite different. Neither timer is an 8252.
|
|
* We actually only call this with unit = 0 and timer = 0. It
|
|
* could be static...
|
|
*/
|
|
/*
|
|
* Protect ourself against interrupts.
|
|
* XXX - sysbeep() and sysbeepstop() need protection.
|
|
*/
|
|
disable_intr();
|
|
/*
|
|
* Latch the count for 'timer' (cc00xxxx, c = counter, x = any).
|
|
*/
|
|
outb(IO_TIMER1 + 3, timer << 6);
|
|
|
|
low = inb(IO_TIMER1 + timer);
|
|
high = inb(IO_TIMER1 + timer);
|
|
enable_intr();
|
|
return ((high << 8) | low);
|
|
}
|
|
|
|
static int beeping;
|
|
|
|
static void
|
|
sysbeepstop(f, dummy)
|
|
caddr_t f;
|
|
int dummy;
|
|
{
|
|
/* disable counter 2 */
|
|
outb(0x61, inb(0x61) & 0xFC);
|
|
if (f)
|
|
timeout(sysbeepstop, (caddr_t)0, (int)f);
|
|
else
|
|
beeping = 0;
|
|
}
|
|
|
|
void
|
|
sysbeep(int pitch, int period)
|
|
{
|
|
|
|
outb(0x61, inb(0x61) | 3); /* enable counter 2 */
|
|
/*
|
|
* XXX - move timer stuff to clock.c.
|
|
* Program counter 2:
|
|
* ccaammmb, c counter, a = access, m = mode, b = BCD
|
|
* 1011x110, 11 for aa = LSB then MSB, x11 for mmm = square wave.
|
|
*/
|
|
outb(0x43, 0xb6); /* set command for counter 2, 2 byte write */
|
|
|
|
outb(0x42, pitch);
|
|
outb(0x42, (pitch>>8));
|
|
|
|
if (!beeping) {
|
|
beeping = period;
|
|
timeout(sysbeepstop, (caddr_t)(period/2), period);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Pass command to keyboard controller (8042)
|
|
*/
|
|
unsigned
|
|
kbc_8042cmd(val)
|
|
int val;
|
|
{
|
|
|
|
while (inb(KBSTATP)&KBS_IBF);
|
|
if (val) outb(KBCMDP, val);
|
|
while (inb(KBSTATP)&KBS_IBF);
|
|
return (inb(KBDATAP));
|
|
}
|
|
|
|
/*
|
|
* find an ISA device in a given isa_devtab_* table, given
|
|
* the table to search, the expected id_driver entry, and the unit number.
|
|
*
|
|
* this function is defined in isa_device.h, and this location is debatable;
|
|
* i put it there because it's useless w/o, and directly operates on
|
|
* the other stuff in that file.
|
|
*
|
|
*/
|
|
|
|
struct isa_device *find_isadev(table, driverp, unit)
|
|
struct isa_device *table;
|
|
struct isa_driver *driverp;
|
|
int unit;
|
|
{
|
|
if (driverp == NULL) /* sanity check */
|
|
return NULL;
|
|
|
|
while ((table->id_driver != driverp) || (table->id_unit != unit)) {
|
|
if (table->id_driver == 0)
|
|
return NULL;
|
|
|
|
table++;
|
|
}
|
|
|
|
return table;
|
|
}
|
|
|
|
/*
|
|
* Return nonzero if a (masked) irq is pending for a given device.
|
|
*/
|
|
int
|
|
isa_irq_pending(dvp)
|
|
struct isa_device *dvp;
|
|
{
|
|
unsigned id_irq;
|
|
|
|
id_irq = (unsigned short) dvp->id_irq; /* XXX silly type in struct */
|
|
if (id_irq & 0xff)
|
|
return (inb(IO_ICU1) & id_irq);
|
|
return (inb(IO_ICU2) & (id_irq >> 8));
|
|
}
|