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Kernel: Implement helpers to manipulate MSI(x) data structures

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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.
This commit is contained in:
Pankaj Raghav 2023-05-05 14:37:26 +02:00 • committed by Jelle Raaijmakers
parent bf7ac06d7b
commit f0b6eb6932
4 changed files with 115 additions and 0 deletions
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50
Kernel/Arch/x86_64/PCI/MSI.cpp Normal file
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/*
* Copyright (c) 2023, Pankaj R <dev@pankajraghav.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Arch/Interrupts.h>
#include <Kernel/Arch/PCIMSI.h>
#include <Kernel/Arch/x86_64/Interrupts/APIC.h>
#include <Kernel/Arch/x86_64/PCI/MSI.h>
#include <Kernel/InterruptDisabler.h>
namespace Kernel {
u64 msi_address_register(u8 destination_id, bool redirection_hint, bool destination_mode)
{
u64 flags = 0;
if (redirection_hint) {
flags |= msi_redirection_hint;
if (destination_mode)
flags |= msi_destination_mode_logical;
}
return (msi_address_base | (destination_id << msi_destination_shift) | flags);
}
u32 msi_data_register(u8 vector, bool level_trigger, bool assert)
{
u32 flags = 0;
if (level_trigger) {
flags |= msi_trigger_mode_level;
if (assert)
flags |= msi_level_assert;
}
return ((vector + IRQ_VECTOR_BASE) & msi_data_vector_mask) | flags;
}
u32 msix_vector_control_register(u32 vector_control, bool mask)
{
if (!mask)
return (vector_control & msi_vector_control_unmask);
return (vector_control | msi_vector_control_mask);
}
void msi_signal_eoi()
{
InterruptDisabler disabler;
APIC::the().eoi();
}
}