trouble locating code that increments jiffies (arm)

Hi list, I've been looking for the code that increments the jiffies variable as well as the code that connects a timer interrupt to the function that increments the variable. I'm working with the ARM architecture in case that makes a difference. I was also wondering, how many jiffies are there? Right now I'm finding that if I disable the local timer for the boot CPU (during boot) the jiffies variable stop incrementing. I always assumed the global timer was supposed to increment a single jiffies variable. I'm working with an old, modified, version of QEMU so I'm leaning towards a QEMU bug for this problem. Thanks, -C