https://www.ibm.com/developerworks/cn/linux/l-pci/index.html
https://www.ibm.com/developerworks/cn/linux/l-cn-pci/index.html
http://www.cnblogs.com/TheGrandDesign/archive/2011/08/22/2149024.html
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.1028.3883&rep=rep1&type=pdf