riscv/rocket-chip
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Start adding RoCC

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This commit is contained in:
Andrew Waterman
2013-09-14 15:31:50 -07:00
parent d053bdc89f
commit a0cb711451
4 changed files with 114 additions and 27 deletions
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21
rocket/src/main/scala/ctrl.scala
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@@ -37,7 +37,8 @@ class CtrlDpathIO extends Bundle()
val wb_valid = Bool(OUTPUT)
val ex_mem_type = Bits(OUTPUT, 3)
val ex_rs2_val = Bool(OUTPUT)
val mem_rs2_val = Bool(OUTPUT)
val ex_rocc_val = Bool(OUTPUT)
val mem_rocc_val = Bool(OUTPUT)
val mem_ll_bypass_rs1 = Bool(OUTPUT)
val mem_ll_bypass_rs2 = Bool(OUTPUT)
// exception handling
@@ -317,6 +318,7 @@ class Control(implicit conf: RocketConfiguration) extends Module
val xcpt_dtlb_ld = Bool(INPUT)
val xcpt_dtlb_st = Bool(INPUT)
val fpu = new CtrlFPUIO
val rocc = new RoCCInterface().flip
}
var decode_table = XDecode.table
@@ -376,6 +378,7 @@ class Control(implicit conf: RocketConfiguration) extends Module
val wb_reg_pcr = Reg(init=PCR.N)
val wb_reg_wen = Reg(init=Bool(false))
val wb_reg_fp_wen = Reg(init=Bool(false))
val wb_reg_rocc_val = Reg(init=Bool(false))
val wb_reg_flush_inst = Reg(init=Bool(false))
val wb_reg_mem_val = Reg(init=Bool(false))
val wb_reg_eret = Reg(init=Bool(false))
@@ -416,9 +419,11 @@ class Control(implicit conf: RocketConfiguration) extends Module
val id_amo_aq = io.dpath.inst(16)
val id_amo_rl = io.dpath.inst(15)
val id_fence_next = id_fence || id_amo && id_amo_rl
val id_fence_ok = io.dmem.ordered && !ex_reg_mem_val
val id_rocc_busy = io.rocc.busy || ex_reg_rocc_val || mem_reg_rocc_val || wb_reg_rocc_val
val id_fence_ok = io.dmem.ordered && !ex_reg_mem_val &&
(Bool(conf.rocc.isEmpty) || !id_rocc_busy)
id_reg_fence := id_fence_next || id_reg_fence && !id_fence_ok
val id_do_fence = id_amo && id_amo_aq || id_reg_fence && id_mem_val || id_pcr_flush
val id_do_fence = id_amo && id_amo_aq || id_reg_fence && (id_mem_val || id_rocc_val) || id_pcr_flush
val (id_xcpt, id_cause) = checkExceptions(List(
(id_interrupt, id_interrupt_cause),
@@ -549,6 +554,7 @@ class Control(implicit conf: RocketConfiguration) extends Module
wb_reg_mem_val := Bool(false)
wb_reg_div_mul_val := Bool(false);
wb_reg_fp_val := Bool(false)
wb_reg_rocc_val := Bool(false)
}
.otherwise {
wb_reg_valid := mem_reg_valid
@@ -560,9 +566,11 @@ class Control(implicit conf: RocketConfiguration) extends Module
wb_reg_mem_val := mem_reg_mem_val
wb_reg_div_mul_val := mem_reg_div_mul_val
wb_reg_fp_val := mem_reg_fp_val
wb_reg_rocc_val := mem_reg_rocc_val
}
val replay_wb = io.dmem.resp.bits.nack || wb_reg_replay || io.dpath.pcr_replay
val replay_wb = io.dmem.resp.bits.nack || wb_reg_replay ||
io.dpath.pcr_replay || Bool(!conf.rocc.isEmpty) && wb_reg_rocc_val && !io.rocc.cmd.ready
class Scoreboard(n: Int)
{
@@ -708,7 +716,8 @@ class Control(implicit conf: RocketConfiguration) extends Module
io.dpath.ex_mem_type := ex_reg_mem_type
io.dpath.ex_br_type := ex_reg_br_type
io.dpath.ex_rs2_val := ex_reg_mem_val && isWrite(ex_reg_mem_cmd) || ex_reg_rocc_val
io.dpath.mem_rs2_val := mem_reg_rocc_val
io.dpath.ex_rocc_val := ex_reg_rocc_val
io.dpath.mem_rocc_val := mem_reg_rocc_val
io.fpu.valid := !ctrl_killd && id_fp_val
io.fpu.killx := ctrl_killx
@@ -719,4 +728,6 @@ class Control(implicit conf: RocketConfiguration) extends Module
io.dmem.req.bits.cmd := ex_reg_mem_cmd
io.dmem.req.bits.typ := ex_reg_mem_type
io.dmem.req.bits.phys := Bool(false)
io.rocc.cmd.valid := wb_reg_rocc_val
}