Kernel: Absorb LibBareMetal back into the kernel

This was supposed to be the foundation for some kind of pre-kernel
environment, but nobody is working on it right now, so let's move
everything back into the kernel and remove all the confusion.

Kernel/Console.cpp

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/Console.h>
+#include <Kernel/IO.h>
+#include <Kernel/kstdio.h>
+
+// Bytes output to 0xE9 end up on the Bochs console. It's very handy.
+#define CONSOLE_OUT_TO_E9
+
+static Console* s_the;
+
+Console& Console::the()
+{
+    ASSERT(s_the);
+    return *s_the;
+}
+
+bool Console::is_initialized()
+{
+    return s_the != nullptr;
+}
+
+Console::Console()
+    : CharacterDevice(5, 1)
+{
+    s_the = this;
+}
+
+Console::~Console()
+{
+}
+
+bool Console::can_read(const Kernel::FileDescription&, size_t) const
+{
+    return false;
+}
+
+ssize_t Console::read(Kernel::FileDescription&, size_t, u8*, ssize_t)
+{
+    // FIXME: Implement reading from the console.
+    //        Maybe we could use a ring buffer for this device?
+    return 0;
+}
+
+ssize_t Console::write(Kernel::FileDescription&, size_t, const u8* data, ssize_t size)
+{
+    if (!size)
+        return 0;
+    if (!m_implementation)
+        return 0;
+    for (ssize_t i = 0; i < size; ++i)
+        put_char(data[i]);
+    return size;
+}
+
+void Console::put_char(char ch)
+{
+#ifdef CONSOLE_OUT_TO_E9
+    //if (ch != 27)
+    IO::out8(0xe9, ch);
+#endif
+    m_logbuffer.enqueue(ch);
+    if (m_implementation)
+        m_implementation->on_sysconsole_receive(ch);
+}
+
+ConsoleImplementation::~ConsoleImplementation()
+{
+}