ladybird/Kernel/ACPI/MultiProcessorParser.h

/*
 * 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/Types.h>
#include <Kernel/VM/Region.h>
#include <LibBareMetal/Memory/PhysicalAddress.h>
#include <LibBareMetal/Memory/VirtualAddress.h>

namespace Kernel {
namespace MultiProcessor {

    struct [[gnu::packed]] FloatingPointer
    {
        char sig[4];
        u32 physical_address_ptr;
        u8 length;
        u8 specification_revision;
        u8 checksum;
        u8 feature_info[5];
    };

    struct [[gnu::packed]] EntryHeader
    {
        u8 entry_type;
    };

    struct [[gnu::packed]] ConfigurationTableHeader
    {
        char sig[4];
        u16 length;
        u8 specification_revision;
        u8 checksum;
        char oem_id[8];
        char product_id[12];
        u32 oem_table_ptr;
        u16 oem_table_size;
        u16 entry_count;
        u32 local_apic_address;
        u16 ext_table_length;
        u8 ext_table_checksum;
        u8 reserved;
        EntryHeader entries[];
    };

    enum class ConfigurationTableEntryType {
        Processor = 0,
        Bus = 1,
        IOAPIC = 2,
        IO_Interrupt_Assignment = 3,
        Local_Interrupt_Assignment = 4,
        SystemAddressSpaceMapping = 128,
        BusHierarchyDescriptor = 129,
        CompatibilityBusAddressSpaceModifier = 130
    };

    enum class ConfigurationTableEntryLength {
        Processor = 20,
        Bus = 8,
        IOAPIC = 8,
        IO_Interrupt_Assignment = 8,
        Local_Interrupt_Assignment = 8,
        SystemAddressSpaceMapping = 20,
        BusHierarchyDescriptor = 8,
        CompatibilityBusAddressSpaceModifier = 8
    };

    struct [[gnu::packed]] ExtEntryHeader
    {
        u8 entry_type;
        u8 entry_length;
    };

    struct [[gnu::packed]] ProcessorEntry
    {
        EntryHeader h;
        u8 local_apic_id;
        u8 local_apic_version;
        u8 cpu_flags;
        u32 cpu_signature;
        u32 feature_flags;
        u8 reserved[8];
    };

    struct [[gnu::packed]] BusEntry
    {
        EntryHeader h;
        u8 bus_id;
        char bus_type[6];
    };

    struct [[gnu::packed]] IOAPICEntry
    {
        EntryHeader h;
        u8 ioapic_id;
        u8 ioapic_version;
        u8 ioapic_flags;
        u32 ioapic_address;
    };

    enum class InterruptType {
        INT = 0,
        NMI = 1,
        SMI = 2,
        ExtINT = 3,
    };

    struct [[gnu::packed]] IOInterruptAssignmentEntry
    {
        EntryHeader h;
        u8 interrupt_type;
        u8 polarity;
        u8 trigger_mode;
        u8 source_bus_id;
        u8 source_bus_irq;
        u8 destination_ioapic_id;
        u8 destination_ioapic_intin_pin;
    };

    struct [[gnu::packed]] LocalInterruptAssignmentEntry
    {
        EntryHeader h;
        u8 interrupt_type;
        u8 polarity;
        u8 trigger_mode;
        u8 source_bus_id;
        u8 source_bus_irq;
        u8 destination_lapic_id;
        u8 destination_lapic_lintin_pin;
    };

    enum class SystemAddressType {
        IO = 0,
        Memory = 1,
        Prefetch = 2,
    };

    struct [[gnu::packed]] SystemAddressSpaceMappingEntry
    {
        ExtEntryHeader h;
        u8 bus_id;
        u8 address_type;
        u64 address_base;
        u64 length;
    };

    struct [[gnu::packed]] BusHierarchyDescriptorEntry
    {
        ExtEntryHeader h;
        u8 bus_id;
        u8 bus_info;
        u8 parent_bus;
        u8 reserved[3];
    };

    struct [[gnu::packed]] CompatibilityBusAddressSpaceModifierEntry
    {
        ExtEntryHeader h;
        u8 bus_id;
        u8 address_modifier;
        u32 predefined_range_list;
    };

}

class PCIInterruptOverrideMetadata : public RefCounted<PCIInterruptOverrideMetadata> {
public:
    PCIInterruptOverrideMetadata(u8 bus_id, u8 polarity, u8 trigger_mode, u8 source_irq, u32 ioapic_id, u16 ioapic_int_pin);
    u8 bus() const;
    u8 polarity() const;
    u8 trigger_mode() const;
    u8 pci_interrupt_pin() const;
    u8 pci_device_number() const;
    u32 ioapic_id() const;
    u16 ioapic_interrupt_pin() const;

private:
    u8 m_bus_id;
    u8 m_polarity;
    u8 m_trigger_mode;
    u8 m_pci_interrupt_pin;
    u8 m_pci_device_number;
    u32 m_ioapic_id;
    u16 m_ioapic_interrupt_pin;
};

class MultiProcessorParser {
public:
    static MultiProcessorParser& the();

    static bool is_initialized();
    static void initialize();
    Vector<RefPtr<PCIInterruptOverrideMetadata>> get_pci_interrupt_redirections();

protected:
    MultiProcessorParser();

    void parse_configuration_table();
    size_t get_configuration_table_length();
    void parse_floating_pointer_data();

    Vector<unsigned> get_pci_bus_ids();

    uintptr_t search_floating_pointer();
    uintptr_t search_floating_pointer_in_ebda(u16 ebda_segment);
    uintptr_t search_floating_pointer_in_bios_area();

    uintptr_t m_floating_pointer;
    uintptr_t m_configuration_table;
    Vector<uintptr_t> m_io_interrupt_redirection_entries;
    Vector<uintptr_t> m_bus_entries;
    bool m_operable;

    size_t m_configuration_table_length;
    u8 m_specification_revision;
};
}