From cf0a12c68f0281cc21be4ed0c2b44255a6c5d33b Mon Sep 17 00:00:00 2001
From: Liav A <liavalb@gmail.com>
Date: Fri, 18 Dec 2020 20:27:55 +0200
Subject: [PATCH] Kernel: Add various methods to handle interrupts in the PCI
 subsystem

For now, we only are able to enable or disable pin based interrupts.
Later, when implemented, we could utilize MSI & MSI-X interrupts.
---
 Kernel/PCI/DeviceController.cpp | 43 +++++++++++++++++++++++++++++++++
 Kernel/PCI/DeviceController.h   | 11 +++++++++
 2 files changed, 54 insertions(+)

diff --git a/Kernel/PCI/DeviceController.cpp b/Kernel/PCI/DeviceController.cpp
index becf87c944..ea9455e75c 100644
--- a/Kernel/PCI/DeviceController.cpp
+++ b/Kernel/PCI/DeviceController.cpp
@@ -34,5 +34,48 @@ DeviceController::DeviceController(Address address)
 {
 }
 
+bool DeviceController::is_msi_capable() const
+{
+    for (auto capability : PCI::get_physical_id(pci_address()).capabilities()) {
+        if (capability.m_id == 0x5)
+            return true;
+    }
+    return false;
+}
+bool DeviceController::is_msix_capable() const
+{
+    for (auto capability : PCI::get_physical_id(pci_address()).capabilities()) {
+        if (capability.m_id == 0x11)
+            return true;
+    }
+    return false;
+}
+
+void DeviceController::enable_pin_based_interrupts() const
+{
+    PCI::enable_interrupt_line(pci_address());
+}
+void DeviceController::disable_pin_based_interrupts() const
+{
+    PCI::disable_interrupt_line(pci_address());
+}
+
+void DeviceController::enable_message_signalled_interrupts()
+{
+    TODO();
+}
+void DeviceController::disable_message_signalled_interrupts()
+{
+    TODO();
+}
+void DeviceController::enable_extended_message_signalled_interrupts()
+{
+    TODO();
+}
+void DeviceController::disable_extended_message_signalled_interrupts()
+{
+    TODO();
+}
+
 }
 }
diff --git a/Kernel/PCI/DeviceController.h b/Kernel/PCI/DeviceController.h
index bd42d6c1ec..39935bc9a9 100644
--- a/Kernel/PCI/DeviceController.h
+++ b/Kernel/PCI/DeviceController.h
@@ -35,6 +35,17 @@ public:
     Address pci_address() const { return m_pci_address; };
 
     virtual ~DeviceController() { }
+    void enable_pin_based_interrupts() const;
+    void disable_pin_based_interrupts() const;
+
+    bool is_msi_capable() const;
+    bool is_msix_capable() const;
+
+    void enable_message_signalled_interrupts();
+    void disable_message_signalled_interrupts();
+
+    void enable_extended_message_signalled_interrupts();
+    void disable_extended_message_signalled_interrupts();
 
 protected:
     explicit DeviceController(Address pci_address);