u-boot/common/cmd_log.c
wdenk 228f29ac6e * Improve log buffer code; use "loglevel" to decide which messages
to log on the console, too (like in Linux); get rid of "logstart"
2002-12-08 09:53:23 +00:00

250 lines
5.9 KiB
C

/*
* (C) Copyright 2002
* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
*
* Code used from linux/kernel/printk.c
* Copyright (C) 1991, 1992 Linus Torvalds
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Comments:
*
* After relocating the code, the environment variable "loglevel" is
* copied to console_loglevel. The functionality is similar to the
* handling in the Linux kernel, i.e. messages logged with a priority
* less than console_loglevel are also output to stdout.
*
* If you want messages with the default level (e.g. POST messages) to
* appear on stdout also, make sure the environment variable
* "loglevel" is set at boot time to a number higher than
* default_message_loglevel below.
*/
/*
* Logbuffer handling routines
*/
#include <common.h>
#include <command.h>
#include <devices.h>
#include <post.h>
#include <logbuff.h>
#if defined(CONFIG_LOGBUFFER)
/* Local prototypes */
static void logbuff_putc (const char c);
static void logbuff_puts (const char *s);
static int logbuff_printk(const char *line);
static char buf[1024];
/* This combination will not print messages with the default loglevel */
static unsigned console_loglevel = 3;
static unsigned default_message_loglevel = 4;
static unsigned char *log_buf = NULL;
static unsigned long *ext_log_size;
static unsigned long *ext_log_start;
static unsigned long *ext_logged_chars;
#define log_size (*ext_log_size)
#define log_start (*ext_log_start)
#define logged_chars (*ext_logged_chars)
/* Forced by code, eh! */
#define LOGBUFF_MAGIC 0xc0de4ced
/* The mapping used here has to be the same as in setup_ext_logbuff ()
in linux/kernel/printk */
void logbuff_init_ptrs (void)
{
DECLARE_GLOBAL_DATA_PTR;
unsigned long *ext_tag;
char *s;
log_buf = (unsigned char *)(gd->bd->bi_memsize-LOGBUFF_LEN);
ext_tag = (unsigned long *)(log_buf)-4;
ext_log_start = (unsigned long *)(log_buf)-3;
ext_log_size = (unsigned long *)(log_buf)-2;
ext_logged_chars = (unsigned long *)(log_buf)-1;
if (*ext_tag!=LOGBUFF_MAGIC) {
logged_chars = log_size = log_start = 0;
*ext_tag = LOGBUFF_MAGIC;
}
/* Initialize default loglevel if present */
if ((s = getenv ("loglevel")) != NULL)
console_loglevel = (int)simple_strtoul (s, NULL, 10);
gd->post_log_word |= LOGBUFF_INITIALIZED;
}
int drv_logbuff_init (void)
{
device_t logdev;
int rc;
/* Device initialization */
memset (&logdev, 0, sizeof (logdev));
strcpy (logdev.name, "logbuff");
logdev.ext = 0; /* No extensions */
logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
logdev.putc = logbuff_putc; /* 'putc' function */
logdev.puts = logbuff_puts; /* 'puts' function */
rc = device_register (&logdev);
return (rc == 0) ? 1 : rc;
}
static void logbuff_putc (const char c)
{
char buf[2];
buf[0] = c;
buf[1] = '\0';
logbuff_printk (buf);
}
static void logbuff_puts (const char *s)
{
logbuff_printk (s);
}
void logbuff_log(char *msg)
{
DECLARE_GLOBAL_DATA_PTR;
if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
logbuff_printk (msg);
} else {
/* Can happen only for pre-relocated errors as logging */
/* at that stage should be disabled */
puts (msg);
}
}
/*
* Subroutine: do_log
*
* Description: Handler for 'log' command..
*
* Inputs: argv[1] contains the subcommand
*
* Return: None
*
*/
int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
char *s;
unsigned long i;
if (strcmp(argv[1],"append") == 0) {
/* Log concatenation of all arguments separated by spaces */
for (i=2; i<argc; i++) {
if (i<argc-1) {
logbuff_printk (argv[i]);
logbuff_putc (' ');
} else {
logbuff_puts (argv[i]);
}
}
return 0;
}
switch (argc) {
case 2:
if (strcmp(argv[1],"show") == 0) {
for (i=0; i < (log_size&LOGBUFF_MASK); i++) {
s = log_buf+((log_start+i)&LOGBUFF_MASK);
putc (*s);
}
return 0;
} else if (strcmp(argv[1],"reset") == 0) {
log_start = 0;
log_size = 0;
logged_chars = 0;
return 0;
} else if (strcmp(argv[1],"info") == 0) {
printf ("Logbuffer at %08lx\n", (unsigned long)log_buf);
printf ("log_start = %08lx\n", log_start);
printf ("log_size = %08lx\n", log_size);
printf ("logged_chars = %08lx\n", logged_chars);
return 0;
}
printf ("Usage:\n%s\n", cmdtp->usage);
return 1;
default:
printf ("Usage:\n%s\n", cmdtp->usage);
return 1;
}
}
static int logbuff_printk(const char *line)
{
int i;
char *msg, *p, *buf_end;
int line_feed;
static signed char msg_level = -1;
strcpy (buf + 3, line);
i = strlen (line);
buf_end = buf + 3 + i;
for (p = buf + 3; p < buf_end; p++) {
msg = p;
if (msg_level < 0) {
if (
p[0] != '<' ||
p[1] < '0' ||
p[1] > '7' ||
p[2] != '>'
) {
p -= 3;
p[0] = '<';
p[1] = default_message_loglevel + '0';
p[2] = '>';
} else
msg += 3;
msg_level = p[1] - '0';
}
line_feed = 0;
for (; p < buf_end; p++) {
log_buf[(log_start+log_size) & LOGBUFF_MASK] = *p;
if (log_size < LOGBUFF_LEN)
log_size++;
else
log_start++;
logged_chars++;
if (*p == '\n') {
line_feed = 1;
break;
}
}
if (msg_level < console_loglevel) {
printf("%s", msg);
}
if (line_feed)
msg_level = -1;
}
return i;
}
#endif /* (CONFIG_LOGBUFFER) */