Adapt log buffer code to support Linux 2.6
A new environment variable, "logversion", selects the log buffer behaviour. If it is not set or set to a value other than 2, then the old, Linux 2.4.4, behaviour is selected. Signed-off-by: Igor Lisitsin <igor@emcraft.com> --
This commit is contained in:
Igor Lisitsin
Wolfgang Denk
parent
a11e06965e
commit
2dc64451b4
116
common/cmd_log.c
116
common/cmd_log.c
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@ -1,5 +1,5 @@
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/*
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* (C) Copyright 2002
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* (C) Copyright 2002-2007
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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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@ -60,45 +60,40 @@ 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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static unsigned log_version = 1;
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static logbuff_t *log;
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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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unsigned long *ext_tag;
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unsigned long post_word;
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unsigned long tag, 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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log = (logbuff_t *)(gd->bd->bi_memsize-LOGBUFF_LEN) - 1;
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/* Set up log version */
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if ((s = getenv ("logversion")) != NULL)
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log_version = (int)simple_strtoul (s, NULL, 10);
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if (log_version == 2)
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tag = log->v2.tag;
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else
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tag = log->v1.tag;
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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_load () & POST_COLDBOOT) {
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logged_chars = log_size = log_start = 0;
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*ext_tag = LOGBUFF_MAGIC;
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if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
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logbuff_reset ();
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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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if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
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logbuff_reset ();
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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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if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
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log->v2.start = log->v2.con;
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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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@ -106,6 +101,15 @@ void logbuff_init_ptrs (void)
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gd->post_log_word |= LOGBUFF_INITIALIZED;
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}
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void logbuff_reset (void)
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{
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memset (log, 0, sizeof (logbuff_t));
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if (log_version == 2)
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log->v2.tag = LOGBUFF_MAGIC;
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else
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log->v1.tag = LOGBUFF_MAGIC;
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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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@ -162,7 +166,7 @@ void logbuff_log(char *msg)
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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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unsigned long i, start, size;
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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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@ -177,21 +181,34 @@ int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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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 = (char *)log_buf+((log_start+i)&LOGBUFF_MASK);
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if (log_version == 2) {
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start = log->v2.start;
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size = log->v2.end - log->v2.start;
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}
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else {
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start = log->v1.start;
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size = log->v1.size;
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}
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for (i=0; i < (size&LOGBUFF_MASK); i++) {
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s = (char *)log->buf+((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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logbuff_reset ();
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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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printf ("Logbuffer at %08lx\n", (unsigned long)log->buf);
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if (log_version == 2) {
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printf ("log_start = %08lx\n", log->v2.start);
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printf ("log_end = %08lx\n", log->v2.end);
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printf ("logged_chars = %08lx\n", log->v2.chars);
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}
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else {
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printf ("log_start = %08lx\n", log->v1.start);
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printf ("log_size = %08lx\n", log->v1.size);
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printf ("logged_chars = %08lx\n", log->v1.chars);
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}
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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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@ -202,7 +219,7 @@ int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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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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@ -211,7 +228,7 @@ U_BOOT_CMD(
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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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@ -241,13 +258,22 @@ static int logbuff_printk(const char *line)
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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 (log_version == 2) {
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log->buf[log->v2.end & LOGBUFF_MASK] = *p;
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log->v2.end++;
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if (log->v2.end - log->v2.start > LOGBUFF_LEN)
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log->v2.start++;
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log->v2.chars++;
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}
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else {
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log->buf[(log->v1.start + log->v1.size) &
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LOGBUFF_MASK] = *p;
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if (log->v1.size < LOGBUFF_LEN)
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log->v1.size++;
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else
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log->v1.start++;
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log->v1.chars++;
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}
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if (*p == '\n') {
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line_feed = 1;
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break;
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@ -1,5 +1,5 @@
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/*
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* (C) Copyright 2002
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* (C) Copyright 2002-2007
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* Detlev Zundel, dzu@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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@ -25,6 +25,7 @@
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#ifdef CONFIG_LOGBUFFER
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#define LOGBUFF_MAGIC 0xc0de4ced /* Forced by code, eh! */
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#define LOGBUFF_LEN (16384) /* Must be 16k right now */
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#define LOGBUFF_MASK (LOGBUFF_LEN-1)
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#define LOGBUFF_OVERHEAD (4096) /* Logbuffer overhead for extra info */
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@ -32,6 +33,29 @@
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#define LOGBUFF_INITIALIZED (1<<31)
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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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typedef struct {
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union {
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struct {
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unsigned long tag;
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unsigned long start;
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unsigned long con;
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unsigned long end;
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unsigned long chars;
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} v2;
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struct {
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unsigned long dummy;
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unsigned long tag;
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unsigned long start;
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unsigned long size;
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unsigned long chars;
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} v1;
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};
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unsigned char buf[0];
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} logbuff_t;
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int drv_logbuff_init (void);
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void logbuff_init_ptrs (void);
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void logbuff_log(char *msg);
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