Performance Counters

Ariane contains a couple of performance counters which can be accessed by software via csr instructions.

Address	Name	Description
0xB00	mcycle	Machine cycle counter
0xB02	minstret	Machine instruction-retired counter
0xB03	l1_icache_miss	L1 instruction cache miss
0xB04	l1_dcache_miss	L1 data chache miss
0xB05	itlb_miss	Instruction TLB miss
0xB06	dtlb_miss	Data TLB miss
0xB07	load	Load instruction counter
0xB08	store	Store instruction counter
0xB09	exception	Exception counter
0xB0A	exception_ret	Return from exception counter
0xB0B	branch_jump	All control flow instructions
0xB0C	call	Function call counter
0xB0D	return	Return from function counter
0xB0E	mispredict	Mispredict counter
0xB0F	sb_full	Scoreboard was full
0xB10	fetch_fifo_empty	Instruction fetch queue is empty