Kernel: Add the IOAPIC class

This class inherits from IRQController class, and represents
the 82093AA IOAPIC chip.

1 files changed, 87 insertions, 0 deletions

diff --git a/Kernel/Interrupts/IOAPIC.h b/Kernel/Interrupts/IOAPIC.h
new file mode 100644
index 0000000000..4192421dfa
--- /dev/null
+++ b/Kernel/Interrupts/IOAPIC.h
@@ -0,0 +1,87 @@
+/*
+ * 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 <Kernel/Interrupts/IRQController.h>
+
+namespace Kernel {
+struct [[gnu::packed]] ioapic_mmio_regs
+{
+    volatile u32 select;
+    u32 reserved[3];
+    volatile u32 window;
+};
+
+class ISAInterruptOverrideMetadata;
+class PCIInterruptOverrideMetadata;
+
+class IOAPIC final : public IRQController {
+public:
+    IOAPIC(ioapic_mmio_regs& regs, u32 gsi_base, Vector<RefPtr<ISAInterruptOverrideMetadata>>& overrides, Vector<RefPtr<PCIInterruptOverrideMetadata>>& pci_overrides);
+    virtual void enable(u8 number) override;
+    virtual void disable(u8 number) override;
+    virtual void hard_disable() override;
+    virtual void eoi(u8 number) const override;
+    virtual bool is_vector_enabled(u8 number) const override;
+    virtual u16 get_isr() const override;
+    virtual u16 get_irr() const override;
+    virtual u32 get_gsi_base() const override { return m_gsi_base; }
+    virtual const char* model() const override { return "IOAPIC"; };
+    virtual IRQControllerType type() const override { return IRQControllerType::i82093AA; }
+
+private:
+    void configure_redirection_entry(int index, u8 interrupt_vector, u8 delivery_mode, bool logical_destination, bool active_low, bool trigger_level_mode, bool masked, u8 destination) const;
+    void reset_redirection_entry(int index) const;
+    void map_interrupt_redirection(u8 interrupt_vector);
+    void reset_all_redirection_entries() const;
+
+    void mask_all_redirection_entries() const;
+    void mask_redirection_entry(u8 index) const;
+    void unmask_redirection_entry(u8 index) const;
+    bool is_redirection_entry_masked(u8 index) const;
+
+    u8 read_redirection_entry_vector(u8 index) const;
+    int find_redirection_entry_by_vector(u8 vector) const;
+    void configure_redirections() const;
+
+    void write_register(u32 index, u32 value) const;
+    u32 read_register(u32 index) const;
+
+    virtual void initialize() override;
+    void map_isa_interrupts();
+    void map_pci_interrupts();
+    void isa_identity_map(int index);
+
+    ioapic_mmio_regs& m_physical_access_registers;
+    u32 m_gsi_base;
+    u8 m_id;
+    u8 m_version;
+    u32 m_redirection_entries;
+    Vector<RefPtr<ISAInterruptOverrideMetadata>> m_isa_interrupt_overrides;
+    Vector<RefPtr<PCIInterruptOverrideMetadata>> m_pci_interrupt_overrides;
+};
+}