diff --git a/sys/tools/gen_pci_vendors.awk b/sys/tools/gen_pci_vendors.awk
new file mode 100755
--- /dev/null
+++ b/sys/tools/gen_pci_vendors.awk
@@ -0,0 +1,72 @@
+#!/usr/bin/awk -f
+
+#-
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2022 Baptiste Daroussin
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS `AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+BEGIN {
+	if (ARGC != 3) {
+		print "Usage gen_vendors pciidsfile vendorheader" > "/dev/stderr"
+		exit 1
+	}
+	pci_file=ARGV[1]
+	header_file=ARGV[2]
+	while ((getline < header_file) > 0) {
+		if (NF == 3 && $1 == "#define")
+			vendors[$2] = $3
+	}
+	while ((getline < pci_file) > 0) {
+		if ($0 ~ "^[0-9a-f]+") {
+			id="0x"$1
+			$1=""
+			key=toupper(substr($0, 2))
+			gsub(/[ \.\)\(-\/\+\',#]/, "_", key)
+			gsub(/["\?&]/, "", key)
+			gsub(/__/, "_", key)
+			gsub(/\[.+\]/, "", key)
+			gsub(/\(.+\)/, "", key)
+			gsub(/_$/, "", key)
+			if (! vendors[key]) {
+				vendors[key] = id
+			}
+		}
+	}
+	guard=header_file
+	gsub(/\./, "_", guard);
+	gsub(/\//, "_", guard);
+	print "/* This file is semi autogenerated, do not manual edit */" > header_file
+	print "#ifndef _"toupper(guard)"_" > header_file
+	print "#define _"toupper(guard)"_" > header_file
+	print ""> header_file
+	for (i in vendors) {
+		if (i ~ /^PCI_VENDOR/) {
+			print "#define "i" "vendors[i] > header_file
+		} else {
+			print "#define PCI_VENDOR_"i" "vendors[i] > header_file
+		}
+	}
+	print "#endif" > header_file
+}