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2272d93215
To declare that we don't have a PCI bus in the system we do two things: 1. Probe IO ports before enabling access - In case we are using the QEMU ISA-PC machine type, IO probing results in floating bus condition (returning 0xFF values), thus, we know we don't have PCI bus on the system. 2. Allow the user to specify to not use the PCI bus at all in the kernel commandline.
61 lines
2 KiB
C++
61 lines
2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Bitmap.h>
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#include <AK/Vector.h>
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#include <Kernel/Bus/PCI/Controller/HostController.h>
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#include <Kernel/Bus/PCI/Definitions.h>
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#include <Kernel/FileSystem/SysFS.h>
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#include <Kernel/Locking/Spinlock.h>
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namespace Kernel::PCI {
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class HostBridge;
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class Access {
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public:
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static bool initialize_for_multiple_pci_domains(PhysicalAddress mcfg_table);
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static bool initialize_for_one_pci_domain();
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void fast_enumerate(Function<void(DeviceIdentifier const&)>&) const;
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void rescan_hardware();
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static Access& the();
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static bool is_initialized();
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static bool is_disabled();
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void write8_field(Address address, u32 field, u8 value);
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void write16_field(Address address, u32 field, u16 value);
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void write32_field(Address address, u32 field, u32 value);
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u8 read8_field(Address address, u32 field);
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u16 read16_field(Address address, u32 field);
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u32 read32_field(Address address, u32 field);
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DeviceIdentifier get_device_identifier(Address address) const;
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Spinlock const& scan_lock() const { return m_scan_lock; }
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RecursiveSpinlock const& access_lock() const { return m_access_lock; }
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void add_host_controller_and_enumerate_attached_devices(NonnullOwnPtr<HostController>, Function<void(DeviceIdentifier const&)> callback);
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private:
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u8 read8_field(Address address, RegisterOffset field);
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u16 read16_field(Address address, RegisterOffset field);
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void add_host_controller(NonnullOwnPtr<HostController>);
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bool find_and_register_pci_host_bridges_from_acpi_mcfg_table(PhysicalAddress mcfg);
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Access();
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Vector<Capability> get_capabilities(Address);
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Optional<u8> get_capabilities_pointer(Address address);
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mutable RecursiveSpinlock m_access_lock;
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mutable Spinlock m_scan_lock;
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HashMap<u32, NonnullOwnPtr<HostController>> m_host_controllers;
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Vector<DeviceIdentifier> m_device_identifiers;
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};
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}
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