Annotation of sys/arch/sparc/dev/zs_kgdb.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: zs_kgdb.c,v 1.2 2005/11/11 15:21:59 fgsch Exp $ */
2: /* $NetBSD: zs_kgdb.c,v 1.1 1997/10/18 00:00:51 gwr Exp $ */
3:
4: /*-
5: * Copyright (c) 1996 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Gordon W. Ross.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
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: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: /*
41: * Hooks for kgdb when attached via the z8530 driver
42: *
43: * To use this, build a kernel with: option KGDB, and
44: * boot that kernel with "-d". (The kernel will call
45: * zs_kgdb_init, kgdb_connect.) When the console prints
46: * "kgdb waiting..." you run "gdb -k kernel" and do:
47: * (gdb) set remotebaud 19200
48: * (gdb) target remote /dev/ttyb
49: */
50:
51: #include <sys/param.h>
52: #include <sys/systm.h>
53: #include <sys/proc.h>
54: #include <sys/device.h>
55: #include <sys/conf.h>
56: #include <sys/ioctl.h>
57: #include <sys/kernel.h>
58: #include <sys/syslog.h>
59: #include <sys/kgdb.h>
60:
61: #include <sparc/dev/z8530reg.h>
62: #include <machine/z8530var.h>
63: #include <sparc/dev/cons.h>
64:
65: /* The Sun3 provides a 4.9152 MHz clock to the ZS chips. */
66: #define PCLK (9600 * 512) /* PCLK pin input clock rate */
67: #define ZSHARD_PRI 6 /* Wired on the CPU board... */
68:
69: #define ZS_DELAY() (CPU_ISSUN4C ? (0) : delay(2))
70:
71: /* The layout of this is hardware-dependent (padding, order). */
72: struct zschan {
73: volatile u_char zc_csr; /* ctrl,status, and indirect access */
74: u_char zc_xxx0;
75: volatile u_char zc_data; /* data */
76: u_char zc_xxx1;
77: };
78:
79: void zs_setparam(struct zs_chanstate *, int, int);
80: struct zsops zsops_kgdb;
81:
82: u_char zs_kgdb_regs[16] = {
83: 0, /* 0: CMD (reset, etc.) */
84: 0, /* 1: ~(ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE) */
85: 0, /* 2: IVECT */
86: ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
87: ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
88: ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
89: 0, /* 6: TXSYNC/SYNCLO */
90: 0, /* 7: RXSYNC/SYNCHI */
91: 0, /* 8: alias for data port */
92: ZSWR9_MASTER_IE | ZSWR9_NO_VECTOR,
93: 0, /*10: Misc. TX/RX control bits */
94: ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
95: 14, /*12: BAUDLO (default=9600) */
96: 0, /*13: BAUDHI (default=9600) */
97: ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK,
98: ZSWR15_BREAK_IE | ZSWR15_DCD_IE,
99: };
100:
101: /*
102: * This replaces "zs_reset()" in the sparc driver.
103: */
104: void
105: zs_setparam(cs, iena, rate)
106: struct zs_chanstate *cs;
107: int iena;
108: int rate;
109: {
110: int s, tconst;
111:
112: bcopy(zs_kgdb_regs, cs->cs_preg, 16);
113:
114: if (iena) {
115: cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE;
116: }
117:
118: /* Initialize the speed, etc. */
119: tconst = BPS_TO_TCONST(cs->cs_brg_clk, rate);
120: cs->cs_preg[5] |= ZSWR5_DTR | ZSWR5_RTS;
121: cs->cs_preg[12] = tconst;
122: cs->cs_preg[13] = tconst >> 8;
123:
124: s = splhigh();
125: zs_loadchannelregs(cs);
126: splx(s);
127: }
128:
129: /*
130: * Set up for kgdb; called at boot time before configuration.
131: * KGDB interrupts will be enabled later when zs0 is configured.
132: * Called after cninit(), so printf() etc. works.
133: */
134: void
135: zs_kgdb_init()
136: {
137: struct zs_chanstate cs;
138: volatile struct zschan *zc;
139: int channel, zsc_unit;
140:
141: /* printf("zs_kgdb_init: kgdb_dev=0x%x\n", kgdb_dev); */
142: if (major(kgdb_dev) != zs_major)
143: return;
144:
145: /* Note: (ttya,ttyb) on zsc1, and (ttyc,ttyd) on zsc0 */
146: zsc_unit = (kgdb_dev & 2) ? 0 : 1;
147: channel = kgdb_dev & 1;
148: printf("zs_kgdb_init: attaching tty%c at %d baud\n",
149: 'a' + (kgdb_dev & 3), kgdb_rate);
150:
151: /* Setup temporary chanstate. */
152: bzero((caddr_t)&cs, sizeof(cs));
153: zc = zs_get_chan_addr(zsc_unit, channel);
154: if (zc == NULL) {
155: printf("zs_kgdb_init: zs not mapped.\n");
156: kgdb_dev = -1;
157: return;
158: }
159:
160: cs.cs_channel = channel;
161: cs.cs_brg_clk = PCLK / 16;
162: cs.cs_reg_csr = &zc->zc_csr;
163: cs.cs_reg_data = &zc->zc_data;
164:
165: /* Now set parameters. (interrupts disabled) */
166: zs_setparam(&cs, 0, kgdb_rate);
167:
168: /* Store the getc/putc functions and arg. */
169: kgdb_attach(zs_getc, zs_putc, (void *)zc);
170: }
171:
172: /*
173: * This is a "hook" called by zstty_attach to allow the tty
174: * to be "taken over" for exclusive use by kgdb.
175: * Return non-zero if this is the kgdb port.
176: *
177: * Set the speed to kgdb_rate, CS8, etc.
178: */
179: int
180: zs_check_kgdb(cs, dev)
181: struct zs_chanstate *cs;
182: int dev;
183: {
184:
185: if (dev != kgdb_dev)
186: return (0);
187:
188: /*
189: * Yes, this is port in use by kgdb.
190: */
191: cs->cs_private = NULL;
192: cs->cs_ops = &zsops_kgdb;
193:
194: /* Now set parameters. (interrupts enabled) */
195: zs_setparam(cs, 1, kgdb_rate);
196:
197: return (1);
198: }
199:
200: /*
201: * KGDB framing character received: enter kernel debugger. This probably
202: * should time out after a few seconds to avoid hanging on spurious input.
203: */
204: void
205: zskgdb(cs)
206: struct zs_chanstate *cs;
207: {
208: int unit = minor(kgdb_dev);
209:
210: printf("zstty%d: kgdb interrupt\n", unit);
211: /* This will trap into the debugger. */
212: kgdb_connect(1);
213: }
214:
215:
216: /****************************************************************
217: * Interface to the lower layer (zscc)
218: ****************************************************************/
219:
220: void zs_kgdb_rxint(struct zs_chanstate *);
221: void zs_kgdb_txint(struct zs_chanstate *);
222: void zs_kgdb_stint(struct zs_chanstate *, int);
223: void zs_kgdb_softint(struct zs_chanstate *);
224:
225: int kgdb_input_lost;
226:
227: void
228: zs_kgdb_rxint(cs)
229: struct zs_chanstate *cs;
230: {
231: register u_char c, rr1;
232:
233: /*
234: * First read the status, because reading the received char
235: * destroys the status of this char.
236: */
237: rr1 = zs_read_reg(cs, 1);
238: c = zs_read_data(cs);
239:
240: if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
241: /* Clear the receive error. */
242: zs_write_csr(cs, ZSWR0_RESET_ERRORS);
243: }
244:
245: if (c == KGDB_START) {
246: zskgdb(cs);
247: } else {
248: kgdb_input_lost++;
249: }
250: }
251:
252: void
253: zs_kgdb_txint(cs)
254: register struct zs_chanstate *cs;
255: {
256: register int rr0;
257:
258: rr0 = zs_read_csr(cs);
259: zs_write_csr(cs, ZSWR0_RESET_TXINT);
260: }
261:
262: void
263: zs_kgdb_stint(cs, force)
264: register struct zs_chanstate *cs;
265: int force;
266: {
267: register int rr0;
268:
269: rr0 = zs_read_csr(cs);
270: zs_write_csr(cs, ZSWR0_RESET_STATUS);
271:
272: /*
273: * Check here for console break, so that we can abort
274: * even when interrupts are locking up the machine.
275: */
276: if (rr0 & ZSRR0_BREAK) {
277: zskgdb(cs);
278: }
279: }
280:
281: void
282: zs_kgdb_softint(cs)
283: struct zs_chanstate *cs;
284: {
285: printf("zs_kgdb_softint?\n");
286: }
287:
288: struct zsops zsops_kgdb = {
289: zs_kgdb_rxint, /* receive char available */
290: zs_kgdb_stint, /* external/status */
291: zs_kgdb_txint, /* xmit buffer empty */
292: zs_kgdb_softint, /* process software interrupt */
293: };
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