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>
--
diff --git a/common/cmd_log.c b/common/cmd_log.c
index 042a403..5bf811e 100644
--- a/common/cmd_log.c
+++ b/common/cmd_log.c
@@ -1,5 +1,5 @@
/*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2007
* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
*
* Code used from linux/kernel/printk.c
@@ -60,45 +60,40 @@
/* 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)
+static unsigned log_version = 1;
+static logbuff_t *log;
-/* 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)
{
- unsigned long *ext_tag;
- unsigned long post_word;
+ unsigned long tag, post_word;
char *s;
+ log = (logbuff_t *)(gd->bd->bi_memsize-LOGBUFF_LEN) - 1;
+
- 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;
+ /* 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 (post_word_load () & POST_COLDBOOT) {
- logged_chars = log_size = log_start = 0;
- *ext_tag = LOGBUFF_MAGIC;
+ if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
+ logbuff_reset ();
}
#else
/* No post routines, so we do our own checking */
- if (post_word != LOGBUFF_MAGIC) {
- logged_chars = log_size = log_start = 0;
+ if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
+ logbuff_reset ();
post_word_store (LOGBUFF_MAGIC);
- *ext_tag = 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);
@@ -106,6 +101,15 @@
gd->post_log_word |= LOGBUFF_INITIALIZED;
}
+void logbuff_reset (void)
+{
+ memset (log, 0, sizeof (logbuff_t));
+ if (log_version == 2)
+ log->v2.tag = LOGBUFF_MAGIC;
+ else
+ log->v1.tag = LOGBUFF_MAGIC;
+}
+
int drv_logbuff_init (void)
{
device_t logdev;
@@ -162,7 +166,7 @@
int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
char *s;
- unsigned long i;
+ unsigned long i, start, size;
if (strcmp(argv[1],"append") == 0) {
/* Log concatenation of all arguments separated by spaces */
@@ -177,21 +181,34 @@
case 2:
if (strcmp(argv[1],"show") == 0) {
- for (i=0; i < (log_size&LOGBUFF_MASK); i++) {
- s = (char *)log_buf+((log_start+i)&LOGBUFF_MASK);
+ if (log_version == 2) {
+ start = log->v2.start;
+ size = log->v2.end - log->v2.start;
+ }
+ else {
+ start = log->v1.start;
+ size = log->v1.size;
+ }
+ for (i=0; i < (size&LOGBUFF_MASK); i++) {
+ s = (char *)log->buf+((start+i)&LOGBUFF_MASK);
putc (*s);
}
return 0;
} else if (strcmp(argv[1],"reset") == 0) {
- log_start = 0;
- log_size = 0;
- logged_chars = 0;
+ logbuff_reset ();
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);
+ printf ("Logbuffer at %08lx\n", (unsigned long)log->buf);
+ if (log_version == 2) {
+ printf ("log_start = %08lx\n", log->v2.start);
+ printf ("log_end = %08lx\n", log->v2.end);
+ 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;
}
printf ("Usage:\n%s\n", cmdtp->usage);
@@ -202,7 +219,7 @@
return 1;
}
}
-#if defined(CONFIG_LOGBUFFER)
+
U_BOOT_CMD(
log, 255, 1, do_log,
"log - manipulate logbuffer\n",
@@ -211,7 +228,7 @@
"log show - show contents\n"
"log append <msg> - append <msg> to the logbuffer\n"
);
-#endif /* CONFIG_LOGBUFFER */
+
static int logbuff_printk(const char *line)
{
int i;
@@ -241,13 +258,22 @@
}
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 (log_version == 2) {
+ log->buf[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 {
+ log->buf[(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;