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/include/logbuff.h b/include/logbuff.h
index 3acfc18..d415729 100644
--- a/include/logbuff.h
+++ b/include/logbuff.h
@@ -1,5 +1,5 @@
/*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2007
* Detlev Zundel, dzu@denx.de.
*
* See file CREDITS for list of people who contributed to this
@@ -25,6 +25,7 @@
#ifdef CONFIG_LOGBUFFER
+#define LOGBUFF_MAGIC 0xc0de4ced /* Forced by code, eh! */
#define LOGBUFF_LEN (16384) /* Must be 16k right now */
#define LOGBUFF_MASK (LOGBUFF_LEN-1)
#define LOGBUFF_OVERHEAD (4096) /* Logbuffer overhead for extra info */
@@ -32,6 +33,29 @@
#define LOGBUFF_INITIALIZED (1<<31)
+/* The mapping used here has to be the same as in setup_ext_logbuff ()
+ in linux/kernel/printk */
+
+typedef struct {
+ union {
+ struct {
+ unsigned long tag;
+ unsigned long start;
+ unsigned long con;
+ unsigned long end;
+ unsigned long chars;
+ } v2;
+ struct {
+ unsigned long dummy;
+ unsigned long tag;
+ unsigned long start;
+ unsigned long size;
+ unsigned long chars;
+ } v1;
+ };
+ unsigned char buf[0];
+} logbuff_t;
+
int drv_logbuff_init (void);
void logbuff_init_ptrs (void);
void logbuff_log(char *msg);