From 97b36febd5670550a209272db9587776c17237dd Mon Sep 17 00:00:00 2001
From: Liav A <liavalb@gmail.com>
Date: Fri, 18 Dec 2020 20:24:32 +0200
Subject: [PATCH] Kernel: Add a method to retrieve the Physical ID for a PCI
 address

---
 Kernel/PCI/Access.cpp | 18 ++++++++++++++++++
 Kernel/PCI/Access.h   |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/Kernel/PCI/Access.cpp b/Kernel/PCI/Access.cpp
index 3941b77dc6b..cb1fb7e18dc 100644
--- a/Kernel/PCI/Access.cpp
+++ b/Kernel/PCI/Access.cpp
@@ -58,6 +58,19 @@ Access::Access()
     s_access = this;
 }
 
+PhysicalID Access::get_physical_id(Address address) const
+{
+    for (auto physical_id : m_physical_ids) {
+        if (physical_id.address().seg() == address.seg()
+            && physical_id.address().bus() == address.bus()
+            && physical_id.address().slot() == address.slot()
+            && physical_id.address().function() == address.function()) {
+            return physical_id;
+        }
+    }
+    ASSERT_NOT_REACHED();
+}
+
 u8 Access::early_read8_field(Address address, u32 field)
 {
     IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
@@ -137,6 +150,11 @@ Optional<u8> get_capabilities_pointer(Address address)
     return {};
 }
 
+PhysicalID get_physical_id(Address address)
+{
+    return Access::the().get_physical_id(address);
+}
+
 Vector<Capability> get_capabilities(Address address)
 {
     auto capabilities_pointer = PCI::get_capabilities_pointer(address);
diff --git a/Kernel/PCI/Access.h b/Kernel/PCI/Access.h
index 4b6ade98d24..2b53ceaf594 100644
--- a/Kernel/PCI/Access.h
+++ b/Kernel/PCI/Access.h
@@ -60,6 +60,8 @@ public:
     virtual u16 read16_field(Address address, u32 field) = 0;
     virtual u32 read32_field(Address address, u32 field) = 0;
 
+    PhysicalID get_physical_id(Address address) const;
+
 protected:
     virtual void enumerate_hardware(Function<void(Address, ID)>) = 0;