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我在AM335X开发板上想要测试函数运行所占用的clock cycle，了解到可以通过CP15中的Clock cycles counter (CNNT)查看当前cycle值，请问我怎样能够把这个值给取出来，它的地址是多少，怎么取数？
关于这个，最标准的文档在 http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344k/Bgbjjhaj.html，当然百度上也有很多中文的说明
