1 files changed, 50 insertions, 0 deletions
diff --git a/Kernel/Arch/x86_64/PCI/MSI.cpp b/Kernel/Arch/x86_64/PCI/MSI.cpp
new file mode 100644
index 0000000000..874f9aae94
--- /dev/null
+++ b/Kernel/Arch/x86_64/PCI/MSI.cpp
@@ -0,0 +1,50 @@
+/*
+ * 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();
+}
+
+}