From 8e6f2fcd2580894419c2807f8c1c5a8630a7d644 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Sat, 25 Dec 2021 13:45:17 +0100
Subject: [PATCH] libpci: i386-io-windows.h: Skip I/O setup on 16/32-bit non-NT
 systems

16/32-bit non-NT systems allow applications to access PCI I/O ports without
any special setup.
---
 lib/i386-io-windows.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/i386-io-windows.h b/lib/i386-io-windows.h
index d5823ee..e2492df 100644
--- a/lib/i386-io-windows.h
+++ b/lib/i386-io-windows.h
@@ -36,6 +36,17 @@ intel_setup_io(struct pci_access *a)
   MYPROC InitializeWinIo;
   HMODULE lib;
 
+#ifndef _WIN64
+  /* 16/32-bit non-NT systems allow applications to access PCI I/O ports without any special setup. */
+  OSVERSIONINFOA version;
+  version.dwOSVersionInfoSize = sizeof(version);
+  if (GetVersionExA(&version) && version.dwPlatformId < VER_PLATFORM_WIN32_NT)
+    {
+      a->debug("Detected 16/32-bit non-NT system, skipping NT setup...");
+      return 1;
+    }
+#endif
+
   lib = LoadLibrary("WinIo.dll");
   if (!lib)
     {
-- 
2.39.2