riscv/rocket-chip
1
0
Fork 0
Code Releases Activity

only support setpcr/clearpcr of SR

Browse Source 
the full PCR RMW support was wasted area/power
This commit is contained in:
Andrew Waterman
2013-04-02 14:43:01 -07:00
parent d43f484feb
commit 8b439ef20d
2 changed files with 40 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
rocket/src/main/scala/dpath.scala
View File

@ -194,9 +194,6 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
// processor control regfile read
val pcr = new PCR
pcr.io.r.en := io.ctrl.pcr != PCR.N
pcr.io.r.addr := wb_reg_inst(26,22).toUFix
pcr.io.host <> io.host
pcr.io <> io.ctrl
io.ctrl.pcr_replay := pcr.io.replay
@ -287,7 +284,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
wb_reg_wdata := mem_ll_wdata
}
wb_wdata := Mux(io.ctrl.wb_load, io.dmem.resp.bits.data_subword,
Mux(io.ctrl.pcr != PCR.N, pcr.io.r.data,
Mux(io.ctrl.pcr != PCR.N, pcr.io.rw.rdata,
wb_reg_wdata))
if (conf.vec)
@ -321,11 +318,9 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
io.ctrl.fp_sboard_clra := dmem_resp_waddr
// processor control regfile write
pcr.io.w.addr := wb_reg_inst(26,22).toUFix
pcr.io.w.en := io.ctrl.pcr === PCR.T || io.ctrl.pcr === PCR.S || io.ctrl.pcr === PCR.C
pcr.io.w.data := Mux(io.ctrl.pcr === PCR.S, pcr.io.r.data | wb_reg_wdata,
Mux(io.ctrl.pcr === PCR.C, pcr.io.r.data & ~wb_reg_wdata,
wb_reg_wdata))
pcr.io.rw.addr := wb_reg_inst(26,22).toUFix
pcr.io.rw.cmd := io.ctrl.pcr
pcr.io.rw.wdata := wb_reg_wdata
// hook up I$
io.imem.req.bits.currentpc := ex_reg_pc