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https://github.com/RGBCube/serenity
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09b5cefd43
Add a struct named MSIInfo that stores all the relevant MSI information as a part of PCI DeviceIdentifier struct. Populate the MSI struct during the PCI device init.
40 lines
1.3 KiB
C++
40 lines
1.3 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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#include <AK/AnyOf.h>
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#include <AK/Error.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/Bus/PCI/Definitions.h>
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namespace Kernel::PCI {
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ErrorOr<NonnullRefPtr<DeviceIdentifier>> DeviceIdentifier::from_enumerable_identifier(EnumerableDeviceIdentifier const& other_identifier)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) DeviceIdentifier(other_identifier));
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}
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void DeviceIdentifier::initialize()
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{
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for (auto cap : capabilities()) {
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if (cap.id() == PCI::Capabilities::ID::MSIX) {
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auto msix_bir_bar = (cap.read8(4) & msix_table_bir_mask);
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auto msix_bir_offset = (cap.read32(4) & msix_table_offset_mask);
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auto msix_count = (cap.read16(2) & msix_control_table_mask) + 1;
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m_msix_info = MSIxInfo(msix_count, msix_bir_bar, msix_bir_offset);
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}
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if (cap.id() == PCI::Capabilities::ID::MSI) {
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bool message_address_64_bit_format = (cap.read8(msi_control_offset) & msi_address_format_mask);
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u8 count = 1;
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u8 mme_count = (cap.read8(msi_control_offset) & msi_mmc_format_mask) >> 1;
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if (mme_count)
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count = mme_count;
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m_msi_info = MSIInfo(message_address_64_bit_format, count);
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}
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}
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}
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}
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