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56f94be3 1/*
2dc64451 2 * (C) Copyright 2002-2007
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3 * Detlev Zundel, DENX Software Engineering, dzu@denx.de.
4 *
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5 * Code used from linux/kernel/printk.c
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 *
1a459660 8 * SPDX-License-Identifier: GPL-2.0+
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9 *
10 * Comments:
11 *
12 * After relocating the code, the environment variable "loglevel" is
13 * copied to console_loglevel. The functionality is similar to the
14 * handling in the Linux kernel, i.e. messages logged with a priority
15 * less than console_loglevel are also output to stdout.
16 *
17 * If you want messages with the default level (e.g. POST messages) to
18 * appear on stdout also, make sure the environment variable
19 * "loglevel" is set at boot time to a number higher than
20 * default_message_loglevel below.
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21 */
22
23/*
24 * Logbuffer handling routines
25 */
26
27#include <common.h>
28#include <command.h>
52cb4d4f 29#include <stdio_dev.h>
228f29ac 30#include <post.h>
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31#include <logbuff.h>
32
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33DECLARE_GLOBAL_DATA_PTR;
34
56f94be3 35/* Local prototypes */
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36static void logbuff_putc(struct stdio_dev *dev, const char c);
37static void logbuff_puts(struct stdio_dev *dev, const char *s);
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38static int logbuff_printk(const char *line);
39
40static char buf[1024];
41
228f29ac 42/* This combination will not print messages with the default loglevel */
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43static unsigned console_loglevel = 3;
44static unsigned default_message_loglevel = 4;
2dc64451 45static unsigned log_version = 1;
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46#ifdef CONFIG_ALT_LB_ADDR
47static volatile logbuff_t *log;
48#else
2dc64451 49static logbuff_t *log;
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50#endif
51static char *lbuf;
56f94be3 52
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53unsigned long __logbuffer_base(void)
54{
e3866163 55 return CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - LOGBUFF_LEN;
95d449ad 56}
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57unsigned long logbuffer_base(void)
58__attribute__((weak, alias("__logbuffer_base")));
95d449ad 59
1e8e7ae5 60void logbuff_init_ptrs(void)
228f29ac 61{
2dc64451 62 unsigned long tag, post_word;
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63 char *s;
64
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65#ifdef CONFIG_ALT_LB_ADDR
66 log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
67 lbuf = (char *)CONFIG_ALT_LB_ADDR;
68#else
1e8e7ae5 69 log = (logbuff_t *)(logbuffer_base()) - 1;
a253b38b 70 lbuf = (char *)log->buf;
3d610186 71#endif
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72
73 /* Set up log version */
74 if ((s = getenv ("logversion")) != NULL)
1e8e7ae5 75 log_version = (int)simple_strtoul(s, NULL, 10);
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76
77 if (log_version == 2)
78 tag = log->v2.tag;
79 else
80 tag = log->v1.tag;
2960b65a 81 post_word = post_word_load();
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82#ifdef CONFIG_POST
83 /* The post routines have setup the word so we can simply test it */
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84 if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT))
85 logbuff_reset();
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86#else
87 /* No post routines, so we do our own checking */
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88 if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
89 logbuff_reset ();
d1cbe85b 90 post_word_store (LOGBUFF_MAGIC);
1636d1c8 91 }
d1cbe85b 92#endif
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93 if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
94 log->v2.start = log->v2.con;
95
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96 /* Initialize default loglevel if present */
97 if ((s = getenv ("loglevel")) != NULL)
1e8e7ae5 98 console_loglevel = (int)simple_strtoul(s, NULL, 10);
228f29ac 99
0e15ddd1 100 gd->flags |= GD_FLG_LOGINIT;
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101}
102
1e8e7ae5 103void logbuff_reset(void)
2dc64451 104{
3d610186 105#ifndef CONFIG_ALT_LB_ADDR
1e8e7ae5 106 memset(log, 0, sizeof(logbuff_t));
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107#endif
108 if (log_version == 2) {
2dc64451 109 log->v2.tag = LOGBUFF_MAGIC;
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110#ifdef CONFIG_ALT_LB_ADDR
111 log->v2.start = 0;
112 log->v2.con = 0;
113 log->v2.end = 0;
114 log->v2.chars = 0;
115#endif
116 } else {
2dc64451 117 log->v1.tag = LOGBUFF_MAGIC;
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118#ifdef CONFIG_ALT_LB_ADDR
119 log->v1.dummy = 0;
120 log->v1.start = 0;
121 log->v1.size = 0;
122 log->v1.chars = 0;
123#endif
124 }
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125}
126
1e8e7ae5 127int drv_logbuff_init(void)
56f94be3 128{
52cb4d4f 129 struct stdio_dev logdev;
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130 int rc;
131
132 /* Device initialization */
133 memset (&logdev, 0, sizeof (logdev));
134
135 strcpy (logdev.name, "logbuff");
136 logdev.ext = 0; /* No extensions */
137 logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
138 logdev.putc = logbuff_putc; /* 'putc' function */
139 logdev.puts = logbuff_puts; /* 'puts' function */
140
1e8e7ae5 141 rc = stdio_register(&logdev);
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142
143 return (rc == 0) ? 1 : rc;
144}
145
709ea543 146static void logbuff_putc(struct stdio_dev *dev, const char c)
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147{
148 char buf[2];
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149 buf[0] = c;
150 buf[1] = '\0';
1e8e7ae5 151 logbuff_printk(buf);
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152}
153
709ea543 154static void logbuff_puts(struct stdio_dev *dev, const char *s)
56f94be3 155{
228f29ac 156 logbuff_printk (s);
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157}
158
159void logbuff_log(char *msg)
160{
0e15ddd1 161 if ((gd->flags & GD_FLG_LOGINIT)) {
1e8e7ae5 162 logbuff_printk(msg);
56f94be3 163 } else {
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164 /*
165 * Can happen only for pre-relocated errors as logging
166 * at that stage should be disabled
167 */
228f29ac 168 puts (msg);
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169 }
170}
171
172/*
173 * Subroutine: do_log
174 *
175 * Description: Handler for 'log' command..
176 *
177 * Inputs: argv[1] contains the subcommand
178 *
179 * Return: None
180 *
181 */
1e8e7ae5 182int do_log(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
56f94be3 183{
709ea543 184 struct stdio_dev *sdev = NULL;
56f94be3 185 char *s;
2dc64451 186 unsigned long i, start, size;
56f94be3 187
1e8e7ae5 188 if (strcmp(argv[1], "append") == 0) {
228f29ac 189 /* Log concatenation of all arguments separated by spaces */
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190 for (i = 2; i < argc; i++) {
191 logbuff_printk(argv[i]);
709ea543 192 logbuff_putc(sdev, (i < argc - 1) ? ' ' : '\n');
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193 }
194 return 0;
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195 }
196
197 switch (argc) {
198
199 case 2:
1e8e7ae5 200 if (strcmp(argv[1], "show") == 0) {
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201 if (log_version == 2) {
202 start = log->v2.start;
203 size = log->v2.end - log->v2.start;
1e8e7ae5 204 } else {
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205 start = log->v1.start;
206 size = log->v1.size;
207 }
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208 if (size > LOGBUFF_LEN)
209 size = LOGBUFF_LEN;
210 for (i = 0; i < size; i++) {
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211 s = lbuf + ((start + i) & LOGBUFF_MASK);
212 putc(*s);
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213 }
214 return 0;
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215 } else if (strcmp(argv[1], "reset") == 0) {
216 logbuff_reset();
56f94be3 217 return 0;
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218 } else if (strcmp(argv[1], "info") == 0) {
219 printf("Logbuffer at %08lx\n", (unsigned long)lbuf);
2dc64451 220 if (log_version == 2) {
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221 printf("log_start = %08lx\n",
222 log->v2.start);
223 printf("log_end = %08lx\n", log->v2.end);
c0b77e09 224 printf("log_con = %08lx\n", log->v2.con);
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225 printf("logged_chars = %08lx\n",
226 log->v2.chars);
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227 }
228 else {
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229 printf("log_start = %08lx\n",
230 log->v1.start);
231 printf("log_size = %08lx\n",
232 log->v1.size);
233 printf("logged_chars = %08lx\n",
234 log->v1.chars);
2dc64451 235 }
56f94be3 236 return 0;
56f94be3 237 }
4c12eeb8 238 return CMD_RET_USAGE;
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239
240 default:
4c12eeb8 241 return CMD_RET_USAGE;
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242 }
243}
2dc64451 244
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245U_BOOT_CMD(
246 log, 255, 1, do_log,
2fb2604d 247 "manipulate logbuffer",
b37c7e5e 248 "info - show pointer details\n"
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WD
249 "log reset - clear contents\n"
250 "log show - show contents\n"
a89c33db 251 "log append <msg> - append <msg> to the logbuffer"
8bde7f77 252);
2dc64451 253
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254static int logbuff_printk(const char *line)
255{
256 int i;
257 char *msg, *p, *buf_end;
258 int line_feed;
259 static signed char msg_level = -1;
260
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261 strcpy(buf + 3, line);
262 i = strlen(line);
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263 buf_end = buf + 3 + i;
264 for (p = buf + 3; p < buf_end; p++) {
265 msg = p;
266 if (msg_level < 0) {
267 if (
268 p[0] != '<' ||
269 p[1] < '0' ||
270 p[1] > '7' ||
271 p[2] != '>'
272 ) {
273 p -= 3;
274 p[0] = '<';
275 p[1] = default_message_loglevel + '0';
276 p[2] = '>';
1e8e7ae5 277 } else {
56f94be3 278 msg += 3;
1e8e7ae5 279 }
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280 msg_level = p[1] - '0';
281 }
282 line_feed = 0;
283 for (; p < buf_end; p++) {
2dc64451 284 if (log_version == 2) {
3d610186 285 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
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IL
286 log->v2.end++;
287 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
288 log->v2.start++;
289 log->v2.chars++;
1e8e7ae5 290 } else {
3d610186 291 lbuf[(log->v1.start + log->v1.size) &
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IL
292 LOGBUFF_MASK] = *p;
293 if (log->v1.size < LOGBUFF_LEN)
294 log->v1.size++;
295 else
296 log->v1.start++;
297 log->v1.chars++;
298 }
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299 if (*p == '\n') {
300 line_feed = 1;
301 break;
302 }
303 }
304 if (msg_level < console_loglevel) {
305 printf("%s", msg);
306 }
307 if (line_feed)
308 msg_level = -1;
309 }
310 return i;
311}