Blackfin: add an early shadow console

Add a memory based shadow console to keep a copy of the printk buffer in a
location which can be found externally.  This allows bootloaders to locate
and utilize the log buffer in case of silent (early/resume/etc...) crashes.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/shadow_console.c b/arch/blackfin/kernel/shadow_console.c
new file mode 100644
index 000000000000..15819ff10573
--- /dev/null
+++ b/arch/blackfin/kernel/shadow_console.c
@@ -0,0 +1,78 @@
+/*
+ * manage a small early shadow of the log buffer which we can pass between the
+ * bootloader so early crash messages are communicated properly and easily
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <asm/blackfin.h>
+#include <asm/irq_handler.h>
+#include <asm/early_printk.h>
+
+#define SHADOW_CONSOLE_START            (0x500)
+#define SHADOW_CONSOLE_END              (0x1000)
+#define SHADOW_CONSOLE_MAGIC_LOC        (0x4F0)
+#define SHADOW_CONSOLE_MAGIC            (0xDEADBEEF)
+
+static __initdata char *shadow_console_buffer = (char *)SHADOW_CONSOLE_START;
+
+static __init void early_shadow_write(struct console *con, const char *s,
+                                unsigned int n)
+{
+        /*
+         * save 2 bytes for the double null at the end
+         * once we fail on a long line, make sure we don't write a short line afterwards
+         */
+        if ((shadow_console_buffer + n) <= (char *)(SHADOW_CONSOLE_END - 2)) {
+                memcpy(shadow_console_buffer, s, n);
+                shadow_console_buffer += n;
+                shadow_console_buffer[0] = 0;
+                shadow_console_buffer[1] = 0;
+        } else
+                shadow_console_buffer = (char *)SHADOW_CONSOLE_END;
+}
+
+static __initdata struct console early_shadow_console = {
+        .name = "early_shadow",
+        .write = early_shadow_write,
+        .flags = CON_BOOT | CON_PRINTBUFFER,
+        .index = -1,
+        .device = 0,
+};
+
+__init void enable_shadow_console(void)
+{
+        int *loc = (int *)SHADOW_CONSOLE_MAGIC_LOC;
+
+        if (!(early_shadow_console.flags & CON_ENABLED)) {
+                register_console(&early_shadow_console);
+                /* for now, assume things are going to fail */
+                *loc = SHADOW_CONSOLE_MAGIC;
+                loc++;
+                *loc = SHADOW_CONSOLE_START;
+        }
+}
+
+static __init int disable_shadow_console(void)
+{
+        /*
+         * by the time pure_initcall runs, the standard console is enabled,
+         * and the early_console is off, so unset the magic numbers
+         * unregistering the console is taken care of in common code (See
+         * ./kernel/printk:disable_boot_consoles() )
+         */
+        int *loc = (int *)SHADOW_CONSOLE_MAGIC_LOC;
+
+        *loc = 0;
+
+        return 0;
+}
+pure_initcall(disable_shadow_console);