From ea1251d465afe8ade713e1fd1313f0a5a1852bee Mon Sep 17 00:00:00 2001
From: Liav A <liavalb@gmail.com>
Date: Sat, 22 Feb 2020 17:05:19 +0200
Subject: [PATCH] Kernel: Add HardwareTimer class

This is an abstraction layer for future hardware timers
that will be implemented.
---
 Kernel/Devices/HardwareTimer.cpp | 41 ++++++++++++++++++++++++++++++++
 Kernel/Devices/HardwareTimer.h   | 40 +++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 Kernel/Devices/HardwareTimer.cpp
 create mode 100644 Kernel/Devices/HardwareTimer.h

diff --git a/Kernel/Devices/HardwareTimer.cpp b/Kernel/Devices/HardwareTimer.cpp
new file mode 100644
index 0000000000..11af19be2b
--- /dev/null
+++ b/Kernel/Devices/HardwareTimer.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * 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/Devices/HardwareTimer.h>
+
+namespace Kernel {
+
+HardwareTimer::HardwareTimer(u8 irq_number)
+    : IRQHandler(irq_number)
+    , m_seconds_since_boot(0)
+{
+}
+
+u32 HardwareTimer::seconds_since_boot()
+{
+    return m_seconds_since_boot;
+}
+}
diff --git a/Kernel/Devices/HardwareTimer.h b/Kernel/Devices/HardwareTimer.h
new file mode 100644
index 0000000000..1e6429f767
--- /dev/null
+++ b/Kernel/Devices/HardwareTimer.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * 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.
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <Kernel/Interrupts/IRQHandler.h>
+namespace Kernel {
+class HardwareTimer : public IRQHandler {
+public:
+    u32 seconds_since_boot();
+
+protected:
+    HardwareTimer(u8 irq_number);
+    u32 m_seconds_since_boot { 0 };
+};
+}