riscv/rocket-chip
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Fix no-FPU elaboration of CSR file

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This commit is contained in:
Andrew Waterman 2016-03-10 17:30:56 -08:00
parent bc15e8649e
commit 82c595d11a
1 changed files with 8 additions and 4 deletions
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12
rocket/src/main/scala/csr.scala
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@ -293,7 +293,9 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val decoded_addr = read_mapping map { case (k, v) => k -> (addr === k) }
val addr_valid = decoded_addr.values.reduce(_||_)
val fp_csr = decoded_addr(CSRs.fflags) || decoded_addr(CSRs.frm) || decoded_addr(CSRs.fcsr)
val fp_csr =
if (usingFPU) decoded_addr(CSRs.fflags) || decoded_addr(CSRs.frm) || decoded_addr(CSRs.fcsr)
else Bool(false)
val csr_addr_priv = io.rw.addr(9,8)
val priv_sufficient = reg_mstatus.prv >= csr_addr_priv
val read_only = io.rw.addr(11,10).andR
@ -442,9 +444,6 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
reg_mip.msip := wdata(0)
}
when (decoded_addr(CSRs.mie)) { reg_mie := wdata & supported_interrupts }
when (decoded_addr(CSRs.fflags)) { reg_fflags := wdata }
when (decoded_addr(CSRs.frm)) { reg_frm := wdata }
when (decoded_addr(CSRs.fcsr)) { reg_fflags := wdata; reg_frm := wdata >> reg_fflags.getWidth }
when (decoded_addr(CSRs.mepc)) { reg_mepc := ~(~wdata | (coreInstBytes-1)) }
when (decoded_addr(CSRs.mscratch)) { reg_mscratch := wdata }
if (p(MtvecWritable))
@ -456,6 +455,11 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
when (decoded_addr(CSRs.mfromhost)){ when (reg_fromhost === UInt(0) || !host_csr_req_fire) { reg_fromhost := wdata } }
when (decoded_addr(CSRs.mtohost)) { when (reg_tohost === UInt(0) || host_csr_req_fire) { reg_tohost := wdata } }
when (decoded_addr(CSRs.stats)) { reg_stats := wdata(0) }
if (usingFPU) {
when (decoded_addr(CSRs.fflags)) { reg_fflags := wdata }
when (decoded_addr(CSRs.frm)) { reg_frm := wdata }
when (decoded_addr(CSRs.fcsr)) { reg_fflags := wdata; reg_frm := wdata >> reg_fflags.getWidth }
}
if (usingVM) {
when (decoded_addr(CSRs.sstatus)) {
val new_sstatus = new MStatus().fromBits(wdata)