Pretty simple. Jimi Jazz plays this on an upright, but here it is for electric 
bass. Pretty sweet line if you ask me.

G|----------------------|
D|-5---5----------------|
A|--5---5---3-----------|
E|--------------0-1-2---|

Jimi plays this variation every so often.

G|----------------------|
D|-5---5----------------|
A|--5---5---7b~r--8-9---|
E|----------------------|