Add a script to compute PCI DEVFN

1 files changed, 18 insertions, 0 deletions

diff --git a/devfn b/devfn
new file mode 100755
index 0000000..963fae3
--- /dev/null
+++ b/devfn
@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+def devfn slot, func
+	((((slot) & 0x1f) << 3) | ((func) & 0x07))
+end
+def slot devfn
+	(((devfn) >> 3) & 0x1f)
+end
+def func devfn
+	((devfn) & 0x07)
+end
+
+ARGV.map!{|i| i.to_i 0 }
+if ARGV[1]
+  printf "%x\n", devfn(*ARGV)
+else
+  printf "%x.%02x\n", slot(*ARGV), func(*ARGV)
+end
+