279 lines
7.3 KiB
C
279 lines
7.3 KiB
C
/* $NetBSD: zs_kgdb.c,v 1.3 2002/09/06 13:18:43 gehenna Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross and Wayne Knowles.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Hooks for kgdb when attached via the z8530 driver
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*
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* To use this, build a kernel with: option KGDB, and
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* boot that kernel with "-d". (The kernel will call
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* zs_kgdb_init, kgdb_connect.) When the console prints
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* "kgdb waiting..." you run "gdb -k kernel" and do:
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* (gdb) set remotebaud 19200
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* (gdb) target remote /dev/ttyb
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*/
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#include <sys/param.h>
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#include <sys/systm.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/ioctl.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/kgdb.h>
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#include <dev/ic/z8530reg.h>
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#include <machine/z8530var.h>
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/*
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* Hooks for kgdb when attached via the z8530 driver
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*
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* To use this, build a kernel with: option KGDB, and
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* boot that kernel with "-d". (The kernel will call
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* zs_kgdb_init, kgdb_connect.) When the console prints
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* "kgdb waiting..." you run "gdb -k kernel" and do:
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* (gdb) set remotebaud 19200
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* (gdb) target remote /dev/ttyb
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*/
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void zs_kgdb_init __P((void));
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void zskgdb __P((struct zs_chanstate *cs));
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static void zs_setparam __P((struct zs_chanstate *, int, int));
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static struct zsops zsops_kgdb;
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extern struct zschan *zs_get_chan_addr (int zs_unit, int channel);
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extern int zs_getc __P((void *arg));
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extern void zs_putc __P((void *arg, int c));
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static u_char zs_kgdb_regs[16] = {
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0, /* 0: CMD (reset, etc.) */
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0, /* 1: No interrupts yet. */
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0, /* 2: IVECT */
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ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
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ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
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ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
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0, /* 6: TXSYNC/SYNCLO */
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0, /* 7: RXSYNC/SYNCHI */
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0, /* 8: alias for data port */
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ZSWR9_MASTER_IE | ZSWR9_NO_VECTOR,
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0, /*10: Misc. TX/RX control bits */
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ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
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14, /*12: BAUDLO (default=9600) */
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0, /*13: BAUDHI (default=9600) */
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ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK,
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ZSWR15_BREAK_IE,
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};
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static void
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zs_setparam(cs, iena, rate)
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struct zs_chanstate *cs;
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int iena;
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int rate;
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{
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int s, tconst;
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memcpy(cs->cs_preg, zs_kgdb_regs, 16);
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if (iena) {
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cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE;
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}
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/* Initialize the speed, etc. */
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tconst = BPS_TO_TCONST(cs->cs_brg_clk, rate);
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cs->cs_preg[5] |= ZSWR5_DTR | ZSWR5_RTS;
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cs->cs_preg[12] = tconst;
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cs->cs_preg[13] = tconst >> 8;
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s = splhigh();
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zs_loadchannelregs(cs);
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splx(s);
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}
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/*
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* Set up for kgdb; called at boot time before configuration.
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* KGDB interrupts will be enabled later when zs0 is configured.
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* Called after cninit(), so printf() etc. works.
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*/
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void
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zs_kgdb_init()
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{
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volatile struct zschan *zc;
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int channel, unit;
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extern const struct cdevsw zstty_cdevsw;
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if (cdevsw_lookup(kgdb_dev) != &zstty_cdevsw)
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return;
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unit = (kgdb_dev & 2) ? 2 : 0;
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channel = kgdb_dev & 1;
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printf("zs_kgdb_init: attaching serial%d at %d baud\n",
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(kgdb_dev & 3), kgdb_rate);
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zc = zs_get_chan_addr(unit, channel);
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/* Attach KGDB comms functions to this device */
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kgdb_attach(zs_getc, zs_putc, (void *)zc);
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}
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/*
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* This is a "hook" called by the MI zstty_attach driver
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* to allow the tty to be "taken over" for exclusive use by kgdb.
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* Return non-zero if this is the kgdb port.
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*
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* Set the speed to kgdb_rate, CS8, etc.
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*/
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int
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zs_check_kgdb(cs, dev)
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struct zs_chanstate *cs;
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int dev;
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{
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if (dev != kgdb_dev)
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return (0);
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/*
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* Yes, this is port in use by kgdb.
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*/
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cs->cs_private = NULL;
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cs->cs_ops = &zsops_kgdb;
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/* Now set parameters. (interrupts enabled) */
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zs_setparam(cs, 1, kgdb_rate);
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return (1);
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}
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/*
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* KGDB framing character received: enter kernel debugger. This probably
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* should time out after a few seconds to avoid hanging on spurious input.
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*/
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void
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zskgdb(cs)
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struct zs_chanstate *cs;
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{
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int unit = minor(kgdb_dev);
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printf("zstty%d: kgdb interrupt\n", unit);
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/* This will trap into the debugger. */
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kgdb_connect(1);
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}
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/****************************************************************
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* Interface to the lower layer (zscc)
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****************************************************************/
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static void zs_kgdb_rxint __P((struct zs_chanstate *));
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static void zs_kgdb_stint __P((struct zs_chanstate *, int));
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static void zs_kgdb_txint __P((struct zs_chanstate *));
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static void zs_kgdb_softint __P((struct zs_chanstate *));
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static struct zsops zsops_kgdb = {
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zs_kgdb_rxint, /* receive char available */
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zs_kgdb_stint, /* external/status */
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zs_kgdb_txint, /* xmit buffer empty */
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zs_kgdb_softint, /* process software interrupt */
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};
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int kgdb_input_lost;
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static void
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zs_kgdb_rxint(cs)
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struct zs_chanstate *cs;
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{
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register u_char c, rr1;
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/*
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* First read the status, because reading the received char
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* destroys the status of this char.
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*/
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rr1 = zs_read_reg(cs, 1);
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c = zs_read_data(cs);
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if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
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/* Clear the receive error. */
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zs_write_csr(cs, ZSWR0_RESET_ERRORS);
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}
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if (c == KGDB_START) {
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zskgdb(cs);
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} else {
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kgdb_input_lost++;
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}
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}
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static void
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zs_kgdb_txint(cs)
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register struct zs_chanstate *cs;
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{
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register int rr0;
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rr0 = zs_read_csr(cs);
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zs_write_csr(cs, ZSWR0_RESET_TXINT);
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}
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static void
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zs_kgdb_stint(cs, force)
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register struct zs_chanstate *cs;
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int force;
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{
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register int rr0;
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rr0 = zs_read_csr(cs);
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zs_write_csr(cs, ZSWR0_RESET_STATUS);
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/*
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* Check here for console break, so that we can abort
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* even when interrupts are locking up the machine.
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*/
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if (rr0 & ZSRR0_BREAK) {
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zskgdb(cs);
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}
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}
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static void
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zs_kgdb_softint(cs)
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struct zs_chanstate *cs;
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{
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printf("zs_kgdb_softint?\n");
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}
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