I couldnt find a tab for the black sabbath version so i thought id give you one,
But then i found it so ill give you it anyway

e|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|-----------------------------------------------------------------|
D|--------5-777-------5-777-------5------------------5-------------|
A|---5h6h7-------5h6h7-------5h6h7---5h6p5-0-0--5h6h7---5h6p5-0-0--|
E|-----------------------------------------------------------------|
This is a great riff that doesnt get enough credit i think.