COUNTS_PER_USEC
#define COUNTS_PER_USEC (ARM11_PMC_CCNT_HZ / 1000000)
#define COUNTS_PER_USEC (curcpu()->ci_data.cpu_cc_freq / (1000*1000))
#define COUNTS_PER_USEC ((COUNTS_PER_SEC / 1000000) + 1)
#define COUNTS_PER_USEC (COUNTS_PER_SEC / 1000000)
#define COUNTS_PER_USEC ((COUNTS_PER_SEC / 1000000) + 1)
#define COUNTS_PER_USEC (COUNTS_PER_SEC / 1000000)