u-boot/common/cmd_log.c

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/*
* (C) Copyright 2002-2007
* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
*
* Code used from linux/kernel/printk.c
* Copyright (C) 1991, 1992 Linus Torvalds
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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 <stdio_dev.h>
#include <post.h>
#include <logbuff.h>
DECLARE_GLOBAL_DATA_PTR;
/* 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 log_version = 1;
#ifdef CONFIG_ALT_LB_ADDR
static volatile logbuff_t *log;
#else
static logbuff_t *log;
#endif
static char *lbuf;
unsigned long __logbuffer_base(void)
{
return CONFIG_SYS_SDRAM_BASE + gd->ram_size - LOGBUFF_LEN;
}
unsigned long logbuffer_base(void)
__attribute__((weak, alias("__logbuffer_base")));
void logbuff_init_ptrs(void)
{
unsigned long tag, post_word;
char *s;
#ifdef CONFIG_ALT_LB_ADDR
log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
lbuf = (char *)CONFIG_ALT_LB_ADDR;
#else
log = (logbuff_t *)(logbuffer_base()) - 1;
lbuf = (char *)log->buf;
#endif
/* Set up log version */
if ((s = getenv ("logversion")) != NULL)
log_version = (int)simple_strtoul(s, NULL, 10);
if (log_version == 2)
tag = log->v2.tag;
else
tag = log->v1.tag;
post_word = post_word_load();
#ifdef CONFIG_POST
/* The post routines have setup the word so we can simply test it */
if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT))
logbuff_reset();
#else
/* No post routines, so we do our own checking */
if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
logbuff_reset ();
post_word_store (LOGBUFF_MAGIC);
}
#endif
if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
log->v2.start = log->v2.con;
/* Initialize default loglevel if present */
if ((s = getenv ("loglevel")) != NULL)
console_loglevel = (int)simple_strtoul(s, NULL, 10);
gd->flags |= GD_FLG_LOGINIT;
}
void logbuff_reset(void)
{
#ifndef CONFIG_ALT_LB_ADDR
memset(log, 0, sizeof(logbuff_t));
#endif
if (log_version == 2) {
log->v2.tag = LOGBUFF_MAGIC;
#ifdef CONFIG_ALT_LB_ADDR
log->v2.start = 0;
log->v2.con = 0;
log->v2.end = 0;
log->v2.chars = 0;
#endif
} else {
log->v1.tag = LOGBUFF_MAGIC;
#ifdef CONFIG_ALT_LB_ADDR
log->v1.dummy = 0;
log->v1.start = 0;
log->v1.size = 0;
log->v1.chars = 0;
#endif
}
}
int drv_logbuff_init(void)
{
struct stdio_dev 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 = stdio_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)
{
if ((gd->flags & GD_FLG_LOGINIT)) {
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 * const argv[])
{
char *s;
unsigned long i, start, size;
if (strcmp(argv[1], "append") == 0) {
/* Log concatenation of all arguments separated by spaces */
for (i = 2; i < argc; i++) {
logbuff_printk(argv[i]);
logbuff_putc((i < argc - 1) ? ' ' : '\n');
}
return 0;
}
switch (argc) {
case 2:
if (strcmp(argv[1], "show") == 0) {
if (log_version == 2) {
start = log->v2.start;
size = log->v2.end - log->v2.start;
} else {
start = log->v1.start;
size = log->v1.size;
}
if (size > LOGBUFF_LEN)
size = LOGBUFF_LEN;
for (i = 0; i < size; i++) {
s = lbuf + ((start + i) & LOGBUFF_MASK);
putc(*s);
}
return 0;
} else if (strcmp(argv[1], "reset") == 0) {
logbuff_reset();
return 0;
} else if (strcmp(argv[1], "info") == 0) {
printf("Logbuffer at %08lx\n", (unsigned long)lbuf);
if (log_version == 2) {
printf("log_start = %08lx\n",
log->v2.start);
printf("log_end = %08lx\n", log->v2.end);
printf("log_con = %08lx\n", log->v2.con);
printf("logged_chars = %08lx\n",
log->v2.chars);
}
else {
printf("log_start = %08lx\n",
log->v1.start);
printf("log_size = %08lx\n",
log->v1.size);
printf("logged_chars = %08lx\n",
log->v1.chars);
}
return 0;
}
return CMD_RET_USAGE;
default:
return CMD_RET_USAGE;
}
}
U_BOOT_CMD(
log, 255, 1, do_log,
"manipulate logbuffer",
"info - show pointer details\n"
"log reset - clear contents\n"
"log show - show contents\n"
"log append <msg> - append <msg> to the logbuffer"
);
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++) {
if (log_version == 2) {
lbuf[log->v2.end & LOGBUFF_MASK] = *p;
log->v2.end++;
if (log->v2.end - log->v2.start > LOGBUFF_LEN)
log->v2.start++;
log->v2.chars++;
} else {
lbuf[(log->v1.start + log->v1.size) &
LOGBUFF_MASK] = *p;
if (log->v1.size < LOGBUFF_LEN)
log->v1.size++;
else
log->v1.start++;
log->v1.chars++;
}
if (*p == '\n') {
line_feed = 1;
break;
}
}
if (msg_level < console_loglevel) {
printf("%s", msg);
}
if (line_feed)
msg_level = -1;
}
return i;
}