Handout

arch/ioapic.cc

@@ -0,0 +1,44 @@
+#include "ioapic.h"
+
+namespace IOAPIC {
+/*! \brief IOAPIC registers memory mapped into the CPU's address space.
+ *
+ *  Access to the actual IOAPIC registers can be obtained by performing the
+ * following steps:
+ *  1. Write the number of the IOAPIC register to the address stored in
+ * `IOREGSEL_REG`
+ *  2. Read the value from / write the value to the address referred to by
+ * `IOWIN_REG`.
+ *
+ *  \see [IO-APIC manual](intel_ioapic.pdf#page=8)
+ */
+volatile Index *IOREGSEL_REG = reinterpret_cast<volatile Index *>(0xfec00000);
+/// \copydoc IOREGSEL_REG
+volatile Register *IOWIN_REG =
+    reinterpret_cast<volatile Register *>(0xfec00010);
+
+// IOAPIC manual, p. 8
+const Index IOAPICID_IDX = 0x00;
+const Index IOREDTBL_IDX = 0x10;
+
+const uint8_t slot_max = 24;
+
+void init() {}
+
+void config(uint8_t slot, Core::Interrupt::Vector vector,
+            TriggerMode trigger_mode, Polarity polarity) {
+  (void)slot;
+  (void)vector;
+  (void)trigger_mode;
+  (void)polarity;
+}
+
+void allow(uint8_t slot) { (void)slot; }
+
+void forbid(uint8_t slot) { (void)slot; }
+
+bool status(uint8_t slot) {
+  (void)slot;
+  return false;
+}
+}  // namespace IOAPIC