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Kernel: Implement helpers to manipulate MSI(x) data structures
MSIx table entry is used to program interrupt vectors and it is architecture specific. Add helper functions declaration in Arch/PCIMSI.h. The definition of the function is placed in the respective arch specific code.
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42
Kernel/Arch/PCIMSI.h
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42
Kernel/Arch/PCIMSI.h
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/*
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* Copyright (c) 2023, Pankaj R <dev@pankajraghav.com>
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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/Types.h>
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namespace Kernel {
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#if ARCH(X86_64)
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u64 msi_address_register(u8 destination_id, bool redirection_hint, bool destination_mode);
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u32 msi_data_register(u8 vector, bool level_trigger, bool assert);
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u32 msix_vector_control_register(u32 vector_control, bool mask);
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void msi_signal_eoi();
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#elif ARCH(AARCH64)
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[[maybe_unused]] static u64 msi_address_register([[maybe_unused]] u8 destination_id, [[maybe_unused]] bool redirection_hint, [[maybe_unused]] bool destination_mode)
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{
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TODO_AARCH64();
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return 0;
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}
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[[maybe_unused]] static u32 msi_data_register([[maybe_unused]] u8 vector, [[maybe_unused]] bool level_trigger, [[maybe_unused]] bool assert)
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{
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TODO_AARCH64();
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return 0;
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}
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[[maybe_unused]] static u32 msix_vector_control_register([[maybe_unused]] u32 vector_control, [[maybe_unused]] bool mask)
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{
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TODO_AARCH64();
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return 0;
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}
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[[maybe_unused]] static void msi_signal_eoi()
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{
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TODO_AARCH64();
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return;
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}
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#endif
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}
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50
Kernel/Arch/x86_64/PCI/MSI.cpp
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50
Kernel/Arch/x86_64/PCI/MSI.cpp
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/*
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* Copyright (c) 2023, Pankaj R <dev@pankajraghav.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/Interrupts.h>
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#include <Kernel/Arch/PCIMSI.h>
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#include <Kernel/Arch/x86_64/Interrupts/APIC.h>
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#include <Kernel/Arch/x86_64/PCI/MSI.h>
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#include <Kernel/InterruptDisabler.h>
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namespace Kernel {
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u64 msi_address_register(u8 destination_id, bool redirection_hint, bool destination_mode)
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{
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u64 flags = 0;
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if (redirection_hint) {
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flags |= msi_redirection_hint;
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if (destination_mode)
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flags |= msi_destination_mode_logical;
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}
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return (msi_address_base | (destination_id << msi_destination_shift) | flags);
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}
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u32 msi_data_register(u8 vector, bool level_trigger, bool assert)
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{
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u32 flags = 0;
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if (level_trigger) {
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flags |= msi_trigger_mode_level;
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if (assert)
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flags |= msi_level_assert;
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}
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return ((vector + IRQ_VECTOR_BASE) & msi_data_vector_mask) | flags;
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}
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u32 msix_vector_control_register(u32 vector_control, bool mask)
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{
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if (!mask)
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return (vector_control & msi_vector_control_unmask);
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return (vector_control | msi_vector_control_mask);
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}
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void msi_signal_eoi()
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{
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InterruptDisabler disabler;
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APIC::the().eoi();
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}
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}
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22
Kernel/Arch/x86_64/PCI/MSI.h
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Kernel/Arch/x86_64/PCI/MSI.h
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/*
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* Copyright (c) 2023, Pankaj R <dev@pankajraghav.com>
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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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// Address register
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static constexpr u32 msi_address_base = 0xfee00000;
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static constexpr u8 msi_destination_shift = 12;
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static constexpr u32 msi_redirection_hint = 0x00000008;
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static constexpr u32 msi_destination_mode_logical = 0x00000004;
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// Data register
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static constexpr u8 msi_data_vector_mask = 0xff;
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static constexpr u32 msi_trigger_mode_level = 0x00008000;
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static constexpr u32 msi_level_assert = 0x00004000;
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// Vector control
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static constexpr u32 msi_vector_control_mask = 0x1;
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static constexpr u32 msi_vector_control_unmask = ~(0x1);
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@ -393,6 +393,7 @@ if ("${SERENITY_ARCH}" STREQUAL "x86_64")
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Arch/x86_64/PCI/Controller/HostBridge.cpp
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Arch/x86_64/PCI/IDELegacyModeController.cpp
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Arch/x86_64/PCI/Initializer.cpp
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Arch/x86_64/PCI/MSI.cpp
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Arch/x86_64/VGA/IOArbiter.cpp
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