2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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7 * documentation is hereby granted, provided that both the copyright
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12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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19 * School of Computer Science
20 * Carnegie Mellon University
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23 * any improvements or extensions that they make and grant Carnegie the
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26 * $FreeBSD: src/sys/ddb/db_output.c,v 1.26 1999/08/28 00:41:09 peter Exp $
30 * Author: David B. Golub, Carnegie Mellon University
35 * Printf and character output for debugger.
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/ctype.h>
42 #include <sys/thread2.h>
43 #include <sys/spinlock2.h>
45 #include <machine/stdarg.h>
48 #include <ddb/db_output.h>
51 * Character output - tracks position in line.
52 * To do this correctly, we should know how wide
53 * the output device is - then we could zero
54 * the line position when the output device wraps
55 * around to the start of the next line.
57 * Instead, we count the number of spaces printed
58 * since the last printing character so that we
59 * don't print trailing spaces. This avoids most
62 static int db_output_position = 0; /* output column */
63 static int db_last_non_space = 0; /* last non-space character */
64 db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */
66 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width)
67 db_expr_t db_max_width = 79; /* output line width */
69 static void db_putchar (int c, void *arg);
72 * Force pending whitespace.
75 db_force_whitespace(void)
77 int last_print, next_tab;
79 last_print = db_last_non_space;
80 while (last_print < db_output_position) {
81 next_tab = NEXT_TAB(last_print);
82 if (next_tab <= db_output_position) {
83 while (last_print < next_tab) { /* DON'T send a tab!!! */
93 db_last_non_space = db_output_position;
97 * Output character. Buffer whitespace.
100 * arg: character to output
103 db_putchar(int c, void *arg)
106 * If not in the debugger, output data to both the console and
107 * the message buffer.
110 if (c == '\r' || c == '\n' || c == '\t' ||
118 if (c == '\r' || c == '\n')
119 db_check_interrupt();
125 if (c > ' ' && c <= '~') {
127 * Printing character.
128 * If we have spaces to print, print them first.
129 * Use tabs if possible.
131 db_force_whitespace();
133 db_output_position++;
134 db_last_non_space = db_output_position;
136 else if (c == '\n') {
139 db_output_position = 0;
140 db_last_non_space = 0;
141 db_check_interrupt();
143 else if (c == '\r') {
146 db_output_position = 0;
147 db_last_non_space = 0;
148 db_check_interrupt();
150 else if (c == '\t') {
151 /* assume tabs every 8 positions */
152 db_output_position = NEXT_TAB(db_output_position);
156 db_output_position++;
158 else if (c == '\007') {
162 /* other characters are assumed non-printing */
167 * Return output position
170 db_print_position(void)
172 return (db_output_position);
178 * NOTE: We bypass subr_prf's cons_spin here by using our own putchar
182 db_printf(const char *fmt, ...)
186 __va_start(listp, fmt);
187 kvcprintf (fmt, db_putchar, NULL, db_radix, listp);
193 db_vprintf(const char *fmt, __va_list va)
195 kvcprintf (fmt, db_putchar, NULL, db_radix, va);
202 db_iprintf(const char *fmt,...)
207 for (i = db_indent; i >= 8; i -= 8)
211 __va_start(listp, fmt);
212 kvcprintf (fmt, db_putchar, NULL, db_radix, listp);
217 * End line if too long.
222 if (db_output_position >= db_max_width)
236 db_printf("--More--");
240 * A whole screenfull or just one line?
243 case '\n': /* just one line */
247 *nl = 0; /* another screenfull */
258 * Replacement for old '%z' kprintf format.
261 db_format_hex(char *buf, size_t bufsiz, quad_t val, int altflag)
263 /* Only use alternate form if val is nonzero. */
264 const char *fmt = (altflag && val) ? "-%#qx" : "-%qx";
271 ksnprintf(buf, bufsiz, fmt, val);
274 /* #define TEMPORARY_DEBUGGING */
275 #ifdef TEMPORARY_DEBUGGING
278 * Temporary Debugging, only turned on manually by kernel hackers trying
279 * to debug extremely low level code. Adjust PCHAR_ as required.
281 static void PCHAR_(int, void * __unused);
284 kprintf0(const char *fmt, ...)
289 kvcprintf(fmt, PCHAR_, NULL, 10, ap);
294 PCHAR_(int c, void *dummy __unused)
296 const int COMC_TXWAIT = 0x40000;
297 const int COMPORT = 0x2f8; /* 0x3f8 COM1, 0x2f8 COM2 */
298 const int LSR_TXRDY = 0x20;
299 const int BAUD = 9600;
300 const int com_lsr = 5;
301 const int com_data = 0;
307 outb(COMPORT+3, 0x83); /* DLAB + 8N1 */
308 outb(COMPORT+0, (115200 / BAUD) & 0xFF);
309 outb(COMPORT+1, (115200 / BAUD) >> 8);
310 outb(COMPORT+3, 0x03); /* 8N1 */
311 outb(COMPORT+4, 0x03); /* RTS+DTR */
312 outb(COMPORT+2, 0x01); /* FIFO_ENABLE */
315 for (wait = COMC_TXWAIT; wait > 0; wait--) {
316 if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
317 outb(COMPORT + com_data, (u_char)c);