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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/ACPI/Definitions.h>
#include <Kernel/Bus/PCI/Access.h>
#include <Kernel/SpinLock.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/PhysicalRegion.h>
#include <Kernel/VM/Region.h>
#include <Kernel/VM/VMObject.h>
namespace Kernel {
namespace PCI {
#define PCI_MMIO_CONFIG_SPACE_SIZE 4096
class MMIOAccess : public Access {
public:
class MMIOSegment {
public:
MMIOSegment(PhysicalAddress, u8, u8);
u8 get_start_bus() const;
u8 get_end_bus() const;
size_t get_size() const;
PhysicalAddress get_paddr() const;
private:
PhysicalAddress m_base_addr;
u8 m_start_bus;
u8 m_end_bus;
};
static void initialize(PhysicalAddress mcfg);
private:
PhysicalAddress determine_memory_mapped_bus_region(u32 segment, u8 bus) const;
void map_bus_region(u32, u8);
VirtualAddress get_device_configuration_space(Address address);
SpinLock<u8> m_access_lock;
u8 m_mapped_bus { 0 };
OwnPtr<Region> m_mapped_region;
protected:
explicit MMIOAccess(PhysicalAddress mcfg);
virtual u32 segment_count() const override;
virtual void enumerate_hardware(Function<void(Address, ID)>) override;
virtual void write8_field(Address address, u32, u8) override;
virtual void write16_field(Address address, u32, u16) override;
virtual void write32_field(Address address, u32, u32) override;
virtual u8 read8_field(Address address, u32) override;
virtual u16 read16_field(Address address, u32) override;
virtual u32 read32_field(Address address, u32) override;
virtual u8 segment_start_bus(u32) const override;
virtual u8 segment_end_bus(u32) const override;
PhysicalAddress m_mcfg;
HashMap<u16, MMIOSegment> m_segments;
};
}
}
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