Kernel/PCI: Move the PCI components as a subfolder to the Bus directory

1 files changed, 92 insertions, 0 deletions

diff --git a/Kernel/Bus/PCI/Access.h b/Kernel/Bus/PCI/Access.h
new file mode 100644
index 0000000000..14fb4be299
--- /dev/null
+++ b/Kernel/Bus/PCI/Access.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Bitmap.h>
+#include <AK/String.h>
+#include <AK/Vector.h>
+#include <Kernel/Bus/PCI/Definitions.h>
+#include <Kernel/FileSystem/SysFS.h>
+
+namespace Kernel::PCI {
+
+class BusExposedFolder final : public SystemExposedFolder {
+public:
+    static void initialize();
+
+private:
+    BusExposedFolder();
+};
+
+class ExposedDeviceFolder final : public SystemExposedFolder {
+public:
+    static NonnullRefPtr<ExposedDeviceFolder> create(const SystemExposedFolder&, Address);
+    const Address& address() const { return m_address; }
+
+private:
+    ExposedDeviceFolder(const SystemExposedFolder&, Address);
+
+    Address m_address;
+};
+
+class ExposedAttribute : public SystemExposedComponent {
+public:
+    static NonnullRefPtr<ExposedAttribute> create(String name, const ExposedDeviceFolder& device, size_t offset, size_t field_bytes_width);
+
+    virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const override;
+    virtual ~ExposedAttribute() {};
+    virtual size_t size() const override;
+
+protected:
+    virtual OwnPtr<KBuffer> try_to_generate_buffer() const;
+    ExposedAttribute(String name, const ExposedDeviceFolder& device, size_t offset, size_t field_bytes_width);
+    NonnullRefPtr<ExposedDeviceFolder> m_device;
+    size_t m_offset;
+    size_t m_field_bytes_width;
+};
+
+class Access {
+public:
+    void enumerate(Function<void(Address, ID)>&) const;
+
+    void enumerate_bus(int type, u8 bus, Function<void(Address, ID)>&, bool recursive);
+    void enumerate_functions(int type, u8 bus, u8 device, u8 function, Function<void(Address, ID)>& callback, bool recursive);
+    void enumerate_device(int type, u8 bus, u8 device, Function<void(Address, ID)>& callback, bool recursive);
+
+    static Access& the();
+    static bool is_initialized();
+    virtual uint32_t segment_count() const = 0;
+    virtual uint8_t segment_start_bus(u32 segment) const = 0;
+    virtual uint8_t segment_end_bus(u32 segment) const = 0;
+    virtual const char* access_type() const = 0;
+
+    virtual void write8_field(Address address, u32 field, u8 value) = 0;
+    virtual void write16_field(Address address, u32 field, u16 value) = 0;
+    virtual void write32_field(Address address, u32 field, u32 value) = 0;
+
+    virtual u8 read8_field(Address address, u32 field) = 0;
+    virtual u16 read16_field(Address address, u32 field) = 0;
+    virtual u32 read32_field(Address address, u32 field) = 0;
+
+    PhysicalID get_physical_id(Address address) const;
+
+protected:
+    virtual void enumerate_hardware(Function<void(Address, ID)>) = 0;
+
+    u8 early_read8_field(Address address, u32 field);
+    u16 early_read16_field(Address address, u32 field);
+    u32 early_read32_field(Address address, u32 field);
+    u16 early_read_type(Address address);
+
+    Access();
+    virtual ~Access() = default;
+
+    Vector<PhysicalID> m_physical_ids;
+    Bitmap m_enumerated_buses;
+};
+
+}