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25ea7461a0
A couple of things were changed: 1. Semantic changes - PCI segments are now called PCI domains, to better match what they are really. It's also the name that Linux gave, and it seems that Wikipedia also uses this name. We also remove PCI::ChangeableAddress, because it was used in the past but now it's no longer being used. 2. There are no WindowedMMIOAccess or MMIOAccess classes anymore, as they made a bunch of unnecessary complexity. Instead, Windowed access is removed entirely (this was tested, but never was benchmarked), so we are left with IO access and memory access options. The memory access option is essentially mapping the PCI bus (from the chosen PCI domain), to virtual memory as-is. This means that unless needed, at any time, there is only one PCI bus being mapped, and this is changed if access to another PCI bus in the same PCI domain is needed. For now, we don't support mapping of different PCI buses from different PCI domains at the same time, because basically it's still a non-issue for most machines out there. 2. OOM-safety is increased, especially when constructing the Access object. It means that we pre-allocating any needed resources, and we try to find PCI domains (if requested to initialize memory access) after we attempt to construct the Access object, so it's possible to fail at this point "gracefully". 3. All PCI API functions are now separated into a different header file, which means only "clients" of the PCI subsystem API will need to include that header file. 4. Functional changes - we only allow now to enumerate the bus after a hardware scan. This means that the old method "enumerate_hardware" is removed, so, when initializing an Access object, the initializing function must call rescan on it to force it to find devices. This makes it possible to fail rescan, and also to defer it after construction from both OOM-safety terms and hotplug capabilities.
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, 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/String.h>
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#include <AK/Vector.h>
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#include <Kernel/Bus/PCI/Definitions.h>
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#include <Kernel/FileSystem/SysFS.h>
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namespace Kernel::PCI {
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class PCIBusSysFSDirectory final : public SysFSDirectory {
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public:
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static void initialize();
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private:
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PCIBusSysFSDirectory();
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};
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class PCIDeviceSysFSDirectory final : public SysFSDirectory {
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public:
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static NonnullRefPtr<PCIDeviceSysFSDirectory> create(const SysFSDirectory&, Address);
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const Address& address() const { return m_address; }
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private:
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PCIDeviceSysFSDirectory(const SysFSDirectory&, Address);
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Address m_address;
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};
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class PCIDeviceAttributeSysFSComponent : public SysFSComponent {
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public:
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static NonnullRefPtr<PCIDeviceAttributeSysFSComponent> create(String name, const PCIDeviceSysFSDirectory& device, size_t offset, size_t field_bytes_width);
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const override;
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virtual ~PCIDeviceAttributeSysFSComponent() {};
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protected:
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virtual OwnPtr<KBuffer> try_to_generate_buffer() const;
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PCIDeviceAttributeSysFSComponent(String name, const PCIDeviceSysFSDirectory& device, size_t offset, size_t field_bytes_width);
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NonnullRefPtr<PCIDeviceSysFSDirectory> m_device;
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size_t m_offset;
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size_t m_field_bytes_width;
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};
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}
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