Its just the badass riff.
Tuning: eBGDAD

e|----------------|
B|----------------|
G|-7-7-777-11\6-6-|  x2
D|----------------|
A|-5-5-555--9\4-4-|
D|----------------|

e|--------------------------|
B|--------------------------|
G|--------------------------|
D|-1p0-1p0-1p0-0--7-76-69-9-|  x2
A|-1p0-1p0-1p0-0--7-76-69-9-|
D|-1p0-1p0-1p0-0--7-76-69-9-|

Just do this 4 times and you got it...

The middle parts goes something like this:

                          PM     PM
e|--------------|    |--------------|
B|--------------|    |--------------|
G|--------------|    |--------------|
D|-7-7-x--7-7-x-| or |--------------|
A|-5-5-x--5-5-x-|    |-5-5-5--5-5-5-|
D|--------------|    |--------------|