Run Genode directly on hardware with 'base-hw'.

base-hw/include/kernel/log.h

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+/*
+ * \brief  Print to kernel log output
+ * \author Martin stein
+ * \date   2012-04-05
+ */
+
+/*
+ * Copyright (C) 2012 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__KERNEL__LOG_H_
+#define _INCLUDE__KERNEL__LOG_H_
+
+/* Genode includes */
+#include <kernel/syscalls.h>
+
+namespace Genode
+{
+	/**
+	 * Prints incoming streams to the kernel log output
+	 */
+	class Kernel_log
+	{
+		/**
+		 * Print an unsigned 4 bit integer as hexadecimal value
+		 */
+		void _print_4bit_hex(unsigned char x) const
+		{
+			/* decode to ASCII char */
+			x &= 0x0f;
+			if (x > 9) x += 39;
+			x += 48;
+
+			/* print ASCII char */
+			Kernel::print_char(x);
+		}
+
+		public:
+
+			/**
+			 * Print zero-terminated string
+			 */
+			Kernel_log & operator << (char const * s)
+			{
+				while (*s) Kernel::print_char(*s++);
+				return *this;
+			}
+
+			/**
+			 * Print an unsigned integer as hexadecimal value
+			 */
+			Kernel_log & operator << (unsigned int const & x)
+			{
+				enum {
+					BYTE_WIDTH = 8,
+					CW         = sizeof(unsigned char)*BYTE_WIDTH,
+					IW         = sizeof(unsigned int)*BYTE_WIDTH
+				};
+
+				/*
+				 * Walk from most significant to least significant bit and
+				 * process 2 hex digits per step.
+				 */
+				bool leading = true;
+				for (int i = IW - CW; i >= 0; i = i - CW)
+				{
+					/* fetch the 2 current digits */
+					unsigned char c = (char)((x >> i) & 0xff);
+
+					/* has the payload part of the value already begun? */
+					if (leading)
+					{
+						/* ignore leading zeros ... */
+						if (!c)
+						{
+							/* ... expect they are the only digits */
+							if (i == 0) _print_4bit_hex(c);
+							continue;
+						}
+						/* transit from leading to payload part */
+						leading = false;
+						if (c < 0x10) {
+							_print_4bit_hex(c);
+							continue;
+						}
+					}
+					/* print both digits */
+					_print_4bit_hex(c >> 4);
+					_print_4bit_hex(c);
+				}
+				return *this;
+			}
+	};
+
+	/**
+	 * Give static 'Kernel_log' reference as target for common log output
+	 */
+	inline Kernel_log & kernel_log()
+	{
+		static Kernel_log _log;
+		return _log;
+	}
+}
+
+#endif /* _INCLUDE__KERNEL__LOG_H_  */
+