riscv/rocket-chip
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Make perf counters optional

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This commit is contained in:
Andrew Waterman 2015-09-28 13:55:23 -07:00
parent 5e88ead984
commit f8a7a80644
2 changed files with 18 additions and 12 deletions
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27
rocket/src/main/scala/csr.scala
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@ -173,6 +173,7 @@ class CSRFile extends CoreModule
io.host.debug_stats_pcr := reg_stats // direct export up the hierarchy
val read_time = if (params(UsePerfCounters)) reg_time else (reg_cycle: UInt)
val read_mstatus = io.status.toBits
val isa_string = "IMA" +
(if (params(UseVM)) "S" else "") +
@ -188,13 +189,11 @@ class CSRFile extends CoreModule
CSRs.fcsr -> (if (!params(BuildFPU).isEmpty) Cat(reg_frm, reg_fflags) else UInt(0)),
CSRs.cycle -> reg_cycle,
CSRs.cyclew -> reg_cycle,
CSRs.instret -> reg_instret,
CSRs.instretw -> reg_instret,
CSRs.time -> reg_time,
CSRs.timew -> reg_time,
CSRs.stime -> reg_time,
CSRs.stimew -> reg_time,
CSRs.mtime -> reg_time,
CSRs.time -> read_time,
CSRs.timew -> read_time,
CSRs.stime -> read_time,
CSRs.stimew -> read_time,
CSRs.mtime -> read_time,
CSRs.mcpuid -> UInt(cpuid),
CSRs.mimpid -> UInt(impid),
CSRs.mstatus -> read_mstatus,
@ -214,6 +213,14 @@ class CSRFile extends CoreModule
CSRs.mtohost -> reg_tohost,
CSRs.mfromhost -> reg_fromhost)
if (params(UsePerfCounters)) {
read_mapping += CSRs.instret -> reg_instret
read_mapping += CSRs.instretw -> reg_instret
for (i <- 0 until reg_uarch_counters.size)
read_mapping += (CSRs.uarch0 + i) -> reg_uarch_counters(i)
}
if (params(UseVM)) {
val read_sstatus = Wire(init=new SStatus().fromBits(read_mstatus))
read_sstatus.zero1 := 0
@ -241,9 +248,6 @@ class CSRFile extends CoreModule
read_mapping += CSRs.stvec -> reg_stvec.sextTo(xLen)
}
for (i <- 0 until reg_uarch_counters.size)
read_mapping += (CSRs.uarch0 + i) -> reg_uarch_counters(i)
for (i <- 0 until params(NCustomMRWCSRs)) {
val addr = 0x790 + i // turn 0x790 into parameter CustomMRWCSRBase?
require(addr >= 0x780 && addr <= 0x7ff, "custom MRW CSR address " + i + " is out of range")
@ -341,7 +345,7 @@ class CSRFile extends CoreModule
assert(PopCount(insn_ret :: insn_redirect_trap :: io.exception :: csr_xcpt :: io.csr_replay :: Nil) <= 1, "these conditions must be mutually exclusive")
when (reg_time >= reg_mtimecmp) {
when (read_time >= reg_mtimecmp) {
reg_mip.mtip := true
}
@ -409,6 +413,7 @@ class CSRFile extends CoreModule
when (decoded_addr(CSRs.mscratch)) { reg_mscratch := wdata }
when (decoded_addr(CSRs.mcause)) { reg_mcause := wdata & UInt((BigInt(1) << (xLen-1)) + 31) /* only implement 5 LSBs and MSB */ }
when (decoded_addr(CSRs.mbadaddr)) { reg_mbadaddr := wdata(vaddrBitsExtended-1,0) }
if (params(UsePerfCounters))
when (decoded_addr(CSRs.instretw)) { reg_instret := wdata }
when (decoded_addr(CSRs.mtimecmp)) { reg_mtimecmp := wdata; reg_mip.mtip := false }
when (decoded_addr(CSRs.mtime)) { reg_time := wdata }

1
rocket/src/main/scala/rocket.scala
View File

@ -14,6 +14,7 @@ case object NMultXpr extends Field[Int]
case object FetchWidth extends Field[Int]
case object RetireWidth extends Field[Int]
case object UseVM extends Field[Boolean]
case object UsePerfCounters extends Field[Boolean]
case object FastLoadWord extends Field[Boolean]
case object FastLoadByte extends Field[Boolean]
case object FastMulDiv extends Field[Boolean]