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diff --git a/src/i8259.h b/src/i8259.h
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+/*
+ * Copyright (c) 2017 Richard Braun.
+ * Copyright (c) 2017 Jerko Lenstra.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ *
+ * Intel 8259 programmable interrupt controller (PIC) driver.
+ */
+
+#ifndef _I8259_H
+#define _I8259_H
+
+/*
+ * Range of vectors used for IRQ handling, 8 per PIC.
+ */
+#define I8259_NR_IRQ_VECTORS 16
+
+/*
+ * Initialize the i8259 module.
+ */
+void i8259_setup(void);
+
+/*
+ * Enable an IRQ line on the PIC.
+ */
+void i8259_irq_enable(unsigned int irq);
+
+/*
+ * Disable an IRQ line on the PIC.
+ */
+void i8259_irq_disable(unsigned int irq);
+
+/*
+ * Report an end of interrupt.
+ *
+ * This function must be called with interrupts disabled.
+ */
+void i8259_irq_eoi(unsigned int irq);
+
+#endif /* _I8259_H */