xen: add raw console write functions for debug

Add a couple of functions which can write directly to the Xen console for debugging. This output ends up on the host's dom0 console (assuming it allows the domain to write there). Signed-off-by: Jeremy Fitzhardinge <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]>
mgowda · May 27, 2008 · 0acf10d · 0acf10d
1 parent 3843fc2
commit 0acf10d
Show file tree

Hide file tree

Showing 2 changed files with 29 additions and 0 deletions.
diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
@@ -157,3 +157,29 @@ struct console xenboot_console = {
 	.write		= xenboot_write_console,
 	.flags		= CON_PRINTBUFFER | CON_BOOT,
 };
+
+void xen_raw_console_write(const char *str)
+{
+	int len = strlen(str);
+
+	while(len > 0) {
+		int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
+		if (rc <= 0)
+			break;
+
+		str += rc;
+		len -= rc;
+	}
+}
+
+void xen_raw_printk(const char *fmt, ...)
+{
+	static char buf[512];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+
+	xen_raw_console_write(buf);
+}
diff --git a/include/xen/hvc-console.h b/include/xen/hvc-console.h
@@ -3,4 +3,7 @@
 
 extern struct console xenboot_console;
 
+void xen_raw_console_write(const char *str);
+void xen_raw_printk(const char *fmt, ...);
+
 #endif	/* XEN_HVC_CONSOLE_H */