From 53b4ea3d315b78cb9d5193cb96b5ef3e5fd55195 Mon Sep 17 00:00:00 2001
From: Undefine <undefine@undefine.pl>
Date: Fri, 6 Nov 2026 18:56:46 +0100
Subject: [PATCH] Kernel: Add make_generic_address_from_io_port

This will be needed to deduplicate ACPI shutdown code for accessing both
the new generic address field and the legacy x86 port field.
---
 Kernel/Firmware/ACPI/GenericAddress.cpp | 11 +++++++++++
 Kernel/Firmware/ACPI/GenericAddress.h   |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/Kernel/Firmware/ACPI/GenericAddress.cpp b/Kernel/Firmware/ACPI/GenericAddress.cpp
index 4c48dbb130c..aa42ee05475 100644
--- a/Kernel/Firmware/ACPI/GenericAddress.cpp
+++ b/Kernel/Firmware/ACPI/GenericAddress.cpp
@@ -14,6 +14,17 @@
 
 namespace Kernel::ACPI {
 
+::ACPI::Structures::GenericAddressStructure make_generic_address_from_io_port(u32 io_port)
+{
+    return ::ACPI::Structures::GenericAddressStructure {
+        .address_space = ::ACPI::GenericAddressStructure::AddressSpace::SystemIO,
+        .bit_width = ::ACPI::GenericAddressStructure::BitWidth::Word,
+        .bit_offset = 0,
+        .access_size = ::ACPI::GenericAddressStructure::AccessSize::Word,
+        .address = io_port,
+    };
+}
+
 static ErrorOr<u8> get_bit_width(::ACPI::Structures::GenericAddressStructure const& structure)
 {
     // NOTE: We need to do a more complicated algorithm because for legacy reasons there are,
diff --git a/Kernel/Firmware/ACPI/GenericAddress.h b/Kernel/Firmware/ACPI/GenericAddress.h
index 68b79f425a2..58880e49247 100644
--- a/Kernel/Firmware/ACPI/GenericAddress.h
+++ b/Kernel/Firmware/ACPI/GenericAddress.h
@@ -11,6 +11,8 @@
 
 namespace Kernel::ACPI {
 
+::ACPI::Structures::GenericAddressStructure make_generic_address_from_io_port(u32 io_port);
+
 ErrorOr<u64> read_generic_address(::ACPI::Structures::GenericAddressStructure const& structure);
 ErrorOr<void> write_generic_address(::ACPI::Structures::GenericAddressStructure const& structure, u64 value);