268 lines
6.6 KiB
C
268 lines
6.6 KiB
C
/*
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* (C) Copyright 2002
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* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
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*
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* Code used from linux/kernel/printk.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* Comments:
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*
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* After relocating the code, the environment variable "loglevel" is
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* copied to console_loglevel. The functionality is similar to the
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* handling in the Linux kernel, i.e. messages logged with a priority
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* less than console_loglevel are also output to stdout.
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*
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* If you want messages with the default level (e.g. POST messages) to
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* appear on stdout also, make sure the environment variable
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* "loglevel" is set at boot time to a number higher than
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* default_message_loglevel below.
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*/
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/*
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* Logbuffer handling routines
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*/
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#include <common.h>
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#include <command.h>
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#include <devices.h>
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#include <post.h>
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#include <logbuff.h>
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#if defined(CONFIG_LOGBUFFER)
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/* Local prototypes */
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static void logbuff_putc (const char c);
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static void logbuff_puts (const char *s);
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static int logbuff_printk(const char *line);
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static char buf[1024];
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/* This combination will not print messages with the default loglevel */
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static unsigned console_loglevel = 3;
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static unsigned default_message_loglevel = 4;
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static unsigned char *log_buf = NULL;
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static unsigned long *ext_log_size;
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static unsigned long *ext_log_start;
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static unsigned long *ext_logged_chars;
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#define log_size (*ext_log_size)
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#define log_start (*ext_log_start)
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#define logged_chars (*ext_logged_chars)
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/* Forced by code, eh! */
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#define LOGBUFF_MAGIC 0xc0de4ced
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/* The mapping used here has to be the same as in setup_ext_logbuff ()
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in linux/kernel/printk */
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void logbuff_init_ptrs (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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unsigned long *ext_tag;
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unsigned long post_word;
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char *s;
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log_buf = (unsigned char *)(gd->bd->bi_memsize-LOGBUFF_LEN);
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ext_tag = (unsigned long *)(log_buf)-4;
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ext_log_start = (unsigned long *)(log_buf)-3;
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ext_log_size = (unsigned long *)(log_buf)-2;
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ext_logged_chars = (unsigned long *)(log_buf)-1;
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post_word = post_word_load();
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#ifdef CONFIG_POST
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/* The post routines have setup the word so we can simply test it */
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if (((post_word & 0xffff) == POST_POWERON) ||
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((post_word & 0xffff) == POST_SLOWTEST)) {
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logged_chars = log_size = log_start = 0;
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*ext_tag = LOGBUFF_MAGIC;
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}
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#else
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/* No post routines, so we do our own checking */
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if (post_word != LOGBUFF_MAGIC) {
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logged_chars = log_size = log_start = 0;
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post_word_store (LOGBUFF_MAGIC);
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*ext_tag = LOGBUFF_MAGIC;
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}
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#endif
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/* Initialize default loglevel if present */
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if ((s = getenv ("loglevel")) != NULL)
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console_loglevel = (int)simple_strtoul (s, NULL, 10);
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gd->post_log_word |= LOGBUFF_INITIALIZED;
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}
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int drv_logbuff_init (void)
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{
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device_t logdev;
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int rc;
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/* Device initialization */
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memset (&logdev, 0, sizeof (logdev));
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strcpy (logdev.name, "logbuff");
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logdev.ext = 0; /* No extensions */
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logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
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logdev.putc = logbuff_putc; /* 'putc' function */
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logdev.puts = logbuff_puts; /* 'puts' function */
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rc = device_register (&logdev);
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return (rc == 0) ? 1 : rc;
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}
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static void logbuff_putc (const char c)
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{
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char buf[2];
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buf[0] = c;
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buf[1] = '\0';
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logbuff_printk (buf);
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}
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static void logbuff_puts (const char *s)
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{
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logbuff_printk (s);
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}
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void logbuff_log(char *msg)
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{
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DECLARE_GLOBAL_DATA_PTR;
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if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
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logbuff_printk (msg);
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} else {
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/* Can happen only for pre-relocated errors as logging */
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/* at that stage should be disabled */
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puts (msg);
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}
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}
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/*
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* Subroutine: do_log
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*
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* Description: Handler for 'log' command..
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*
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* Inputs: argv[1] contains the subcommand
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*
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* Return: None
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*
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*/
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int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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char *s;
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unsigned long i;
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if (strcmp(argv[1],"append") == 0) {
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/* Log concatenation of all arguments separated by spaces */
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for (i=2; i<argc; i++) {
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logbuff_printk (argv[i]);
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logbuff_putc ((i<argc-1) ? ' ' : '\n');
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}
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return 0;
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}
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switch (argc) {
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case 2:
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if (strcmp(argv[1],"show") == 0) {
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for (i=0; i < (log_size&LOGBUFF_MASK); i++) {
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s = log_buf+((log_start+i)&LOGBUFF_MASK);
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putc (*s);
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}
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return 0;
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} else if (strcmp(argv[1],"reset") == 0) {
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log_start = 0;
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log_size = 0;
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logged_chars = 0;
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return 0;
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} else if (strcmp(argv[1],"info") == 0) {
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printf ("Logbuffer at %08lx\n", (unsigned long)log_buf);
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printf ("log_start = %08lx\n", log_start);
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printf ("log_size = %08lx\n", log_size);
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printf ("logged_chars = %08lx\n", logged_chars);
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return 0;
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}
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printf ("Usage:\n%s\n", cmdtp->usage);
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return 1;
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default:
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printf ("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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}
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#if defined(CONFIG_LOGBUFFER)
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U_BOOT_CMD(
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log, 255, 1, do_log,
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"log - manipulate logbuffer\n",
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"info - show pointer details\n"
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"log reset - clear contents\n"
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"log show - show contents\n"
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"log append <msg> - append <msg> to the logbuffer\n"
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);
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#endif /* CONFIG_LOGBUFFER */
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static int logbuff_printk(const char *line)
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{
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int i;
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char *msg, *p, *buf_end;
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int line_feed;
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static signed char msg_level = -1;
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strcpy (buf + 3, line);
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i = strlen (line);
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buf_end = buf + 3 + i;
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for (p = buf + 3; p < buf_end; p++) {
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msg = p;
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if (msg_level < 0) {
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if (
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p[0] != '<' ||
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p[1] < '0' ||
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p[1] > '7' ||
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p[2] != '>'
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) {
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p -= 3;
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p[0] = '<';
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p[1] = default_message_loglevel + '0';
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p[2] = '>';
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} else
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msg += 3;
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msg_level = p[1] - '0';
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}
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line_feed = 0;
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for (; p < buf_end; p++) {
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log_buf[(log_start+log_size) & LOGBUFF_MASK] = *p;
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if (log_size < LOGBUFF_LEN)
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log_size++;
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else
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log_start++;
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logged_chars++;
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if (*p == '\n') {
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line_feed = 1;
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break;
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}
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}
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if (msg_level < console_loglevel) {
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printf("%s", msg);
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}
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if (line_feed)
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msg_level = -1;
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}
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return i;
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}
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#endif /* (CONFIG_LOGBUFFER) */
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