+++ /dev/null
-from nmigen.compat.sim import run_simulation
-from nmigen.cli import verilog, rtlil
-from nmigen import Module, Const, Signal, Array, Cat, Elaboratable
-
-from regfile.regfile import RegFileArray, treereduce
-from scoreboard.fn_unit import IntFnUnit, FPFnUnit, LDFnUnit, STFnUnit
-from scoreboard.fu_fu_matrix import FUFUDepMatrix
-from scoreboard.fu_reg_matrix import FURegDepMatrix
-from scoreboard.global_pending import GlobalPending
-from scoreboard.group_picker import GroupPicker
-from scoreboard.issue_unit import IntFPIssueUnit, RegDecode
-
-from compalu import ComputationUnitNoDelay
-
-from alu_hier import ALU
-from nmutil.latch import SRLatch
-
-from random import randint
-
-
-class Scoreboard(Elaboratable):
- def __init__(self, rwid, n_regs):
- """ Inputs:
-
- * :rwid: bit width of register file(s) - both FP and INT
- * :n_regs: depth of register file(s) - number of FP and INT regs
- """
- self.rwid = rwid
- self.n_regs = n_regs
-
- # Register Files
- self.intregs = RegFileArray(rwid, n_regs)
- self.fpregs = RegFileArray(rwid, n_regs)
-
- # inputs
- self.int_store_i = Signal(reset_less=True) # instruction is a store
- self.int_dest_i = Signal(max=n_regs, reset_less=True) # Dest R# in
- self.int_src1_i = Signal(max=n_regs, reset_less=True) # oper1 R# in
- self.int_src2_i = Signal(max=n_regs, reset_less=True) # oper2 R# in
-
- self.issue_o = Signal(reset_less=True) # instruction was accepted
-
- def elaborate(self, platform):
- m = Module()
-
- m.submodules.intregs = self.intregs
- m.submodules.fpregs = self.fpregs
-
- # register ports
- int_dest = self.intregs.write_port("dest")
- int_src1 = self.intregs.read_port("src1")
- int_src2 = self.intregs.read_port("src2")
-
- fp_dest = self.fpregs.write_port("dest")
- fp_src1 = self.fpregs.read_port("src1")
- fp_src2 = self.fpregs.read_port("src2")
-
- # Int ALUs
- add = ALU(self.rwid)
- sub = ALU(self.rwid)
- m.submodules.comp1 = comp1 = ComputationUnitNoDelay(self.rwid, 1, add)
- m.submodules.comp2 = comp2 = ComputationUnitNoDelay(self.rwid, 1, sub)
- int_alus = [comp1, comp2]
-
- m.d.comb += comp1.oper_i.eq(Const(0)) # temporary/experiment: op=add
- m.d.comb += comp2.oper_i.eq(Const(1)) # temporary/experiment: op=sub
-
- # Int FUs
- if_l = []
- int_src1_pend_v = []
- int_src2_pend_v = []
- int_rd_pend_v = []
- int_wr_pend_v = []
- for i, a in enumerate(int_alus):
- # set up Integer Function Unit, add to module (and python list)
- fu = IntFnUnit(self.n_regs, shadow_wid=0)
- setattr(m.submodules, "intfu%d" % i, fu)
- if_l.append(fu)
- # collate the read/write pending vectors (to go into global pending)
- int_src1_pend_v.append(fu.src1_pend_o)
- int_src2_pend_v.append(fu.src2_pend_o)
- int_rd_pend_v.append(fu.int_rd_pend_o)
- int_wr_pend_v.append(fu.int_wr_pend_o)
- int_fus = Array(if_l)
-
- # Count of number of FUs
- n_int_fus = len(if_l)
- n_fp_fus = 0 # for now
-
- n_fus = n_int_fus + n_fp_fus # plus FP FUs
-
- # XXX replaced by array of FUs? *FnUnit
- # # Integer FU-FU Dep Matrix
- # m.submodules.intfudeps = FUFUDepMatrix(n_int_fus, n_int_fus)
- # Integer FU-Reg Dep Matrix
- # intregdeps = FURegDepMatrix(self.n_regs, n_int_fus)
- # m.submodules.intregdeps = intregdeps
-
- # Integer Priority Picker 1: Adder + Subtractor
- intpick1 = GroupPicker(2) # picks between add and sub
- m.submodules.intpick1 = intpick1
-
- # Global Pending Vectors (INT and FP)
- # NOTE: number of vectors is NOT same as number of FUs.
- g_int_src1_pend_v = GlobalPending(self.n_regs, int_src1_pend_v)
- g_int_src2_pend_v = GlobalPending(self.n_regs, int_src2_pend_v)
- g_int_rd_pend_v = GlobalPending(self.n_regs, int_rd_pend_v, True)
- g_int_wr_pend_v = GlobalPending(self.n_regs, int_wr_pend_v, True)
- m.submodules.g_int_src1_pend_v = g_int_src1_pend_v
- m.submodules.g_int_src2_pend_v = g_int_src2_pend_v
- m.submodules.g_int_rd_pend_v = g_int_rd_pend_v
- m.submodules.g_int_wr_pend_v = g_int_wr_pend_v
-
- # INT/FP Issue Unit
- regdecode = RegDecode(self.n_regs)
- m.submodules.regdecode = regdecode
- issueunit = IntFPIssueUnit(self.n_regs, n_int_fus, n_fp_fus)
- m.submodules.issueunit = issueunit
-
- # FU-FU Dependency Matrices
- intfudeps = FUFUDepMatrix(n_int_fus, n_int_fus)
- m.submodules.intfudeps = intfudeps
-
- #---------
- # ok start wiring things together...
- # "now hear de word of de looord... dem bones dem bones dem dryy bones"
- # https://www.youtube.com/watch?v=pYb8Wm6-QfA
- #---------
-
- #---------
- # Issue Unit is where it starts. set up some in/outs for this module
- #---------
- m.d.comb += [issueunit.i.store_i.eq(self.int_store_i),
- regdecode.dest_i.eq(self.int_dest_i),
- regdecode.src1_i.eq(self.int_src1_i),
- regdecode.src2_i.eq(self.int_src2_i),
- regdecode.enable_i.eq(1),
- self.issue_o.eq(issueunit.issue_o),
- issueunit.i.dest_i.eq(regdecode.dest_o),
- ]
- self.int_insn_i = issueunit.i.insn_i # enabled by instruction decode
-
- # connect global rd/wr pending vectors
- m.d.comb += issueunit.i.g_wr_pend_i.eq(g_int_wr_pend_v.g_pend_o)
- # TODO: issueunit.f (FP)
-
- # and int function issue / busy arrays, and dest/src1/src2
- fn_issue_l = []
- fn_busy_l = []
- for i, fu in enumerate(if_l):
- fn_issue_l.append(fu.issue_i)
- fn_busy_l.append(fu.busy_o)
- m.d.sync += fu.issue_i.eq(issueunit.i.fn_issue_o[i])
- m.d.sync += fu.dest_i.eq(self.int_dest_i)
- m.d.sync += fu.src1_i.eq(self.int_src1_i)
- m.d.sync += fu.src2_i.eq(self.int_src2_i)
- # XXX sync, so as to stop a simulation infinite loop
- m.d.comb += issueunit.i.busy_i[i].eq(fu.busy_o)
-
- #---------
- # connect Function Units
- #---------
-
- # Group Picker... done manually for now. TODO: cat array of pick sigs
- m.d.comb += if_l[0].go_rd_i.eq(intpick1.go_rd_o[0]) # add rd
- m.d.comb += if_l[0].go_wr_i.eq(intpick1.go_wr_o[0]) # add wr
-
- m.d.comb += if_l[1].go_rd_i.eq(intpick1.go_rd_o[1]) # subtract rd
- m.d.comb += if_l[1].go_wr_i.eq(intpick1.go_wr_o[1]) # subtract wr
-
- # create read-pending FU-FU vectors
- intfu_rd_pend_v = Signal(n_int_fus, reset_less = True)
- intfu_wr_pend_v = Signal(n_int_fus, reset_less = True)
- for i in range(n_int_fus):
- #m.d.comb += intfu_rd_pend_v[i].eq(if_l[i].int_rd_pend_o.bool())
- #m.d.comb += intfu_wr_pend_v[i].eq(if_l[i].int_wr_pend_o.bool())
- m.d.comb += intfu_rd_pend_v[i].eq(if_l[i].int_readable_o)
- m.d.comb += intfu_wr_pend_v[i].eq(if_l[i].int_writable_o)
-
- # Connect INT Fn Unit global wr/rd pending
- for fu in if_l:
- m.d.comb += fu.g_int_wr_pend_i.eq(g_int_wr_pend_v.g_pend_o)
- m.d.comb += fu.g_int_rd_pend_i.eq(g_int_rd_pend_v.g_pend_o)
-
- # Connect FU-FU Matrix, NOTE: FN Units readable/writable considered
- # to be unit "read-pending / write-pending"
- m.d.comb += intfudeps.rd_pend_i.eq(intfu_rd_pend_v)
- m.d.comb += intfudeps.wr_pend_i.eq(intfu_wr_pend_v)
- m.d.comb += intfudeps.issue_i.eq(issueunit.i.fn_issue_o)
- for i in range(n_int_fus):
- m.d.comb += intfudeps.go_rd_i[i].eq(intpick1.go_rd_o[i])
- m.d.comb += intfudeps.go_wr_i[i].eq(intpick1.go_wr_o[i])
-
- # Connect Picker (note connection to FU-FU)
- #---------
- readable_o = intfudeps.readable_o
- writable_o = intfudeps.writable_o
- m.d.comb += intpick1.rd_rel_i[0].eq(int_alus[0].rd_rel_o)
- m.d.comb += intpick1.rd_rel_i[1].eq(int_alus[1].rd_rel_o)
- m.d.comb += intpick1.req_rel_i[0].eq(int_alus[0].req_rel_o)
- m.d.comb += intpick1.req_rel_i[1].eq(int_alus[1].req_rel_o)
- m.d.comb += intpick1.readable_i[0].eq(readable_o[0]) # add rd
- m.d.comb += intpick1.writable_i[0].eq(writable_o[0]) # add wr
- m.d.comb += intpick1.readable_i[1].eq(readable_o[1]) # sub rd
- m.d.comb += intpick1.writable_i[1].eq(writable_o[1]) # sub wr
-
- #---------
- # Connect Register File(s)
- #---------
- #with m.If(if_l[0].go_wr_i | if_l[1].go_wr_i):
- m.d.sync += int_dest.wen.eq(g_int_wr_pend_v.g_pend_o)
- #with m.If(intpick1.go_rd_o):
- #with m.If(if_l[0].go_rd_i | if_l[1].go_rd_i):
- m.d.sync += int_src1.ren.eq(g_int_src1_pend_v.g_pend_o)
- m.d.sync += int_src2.ren.eq(g_int_src2_pend_v.g_pend_o)
-
- # merge (OR) all integer FU / ALU outputs to a single value
- # bit of a hack: treereduce needs a list with an item named "dest_o"
- dest_o = treereduce(int_alus)
- m.d.sync += int_dest.data_i.eq(dest_o)
-
- # connect ALUs
- for i, alu in enumerate(int_alus):
- m.d.comb += alu.go_rd_i.eq(intpick1.go_rd_o[i])
- m.d.comb += alu.go_wr_i.eq(intpick1.go_wr_o[i])
- m.d.comb += alu.issue_i.eq(fn_issue_l[i])
- #m.d.comb += fn_busy_l[i].eq(alu.busy_o) # XXX ignore, use fnissue
- m.d.comb += alu.src1_i.eq(int_src1.data_o)
- m.d.comb += alu.src2_i.eq(int_src2.data_o)
- m.d.comb += if_l[i].req_rel_i.eq(alu.req_rel_o) # pipe out ready
-
- return m
-
-
- def __iter__(self):
- yield from self.intregs
- yield from self.fpregs
- yield self.int_store_i
- yield self.int_dest_i
- yield self.int_src1_i
- yield self.int_src2_i
- yield self.issue_o
- #yield from self.int_src1
- #yield from self.int_dest
- #yield from self.int_src1
- #yield from self.int_src2
- #yield from self.fp_dest
- #yield from self.fp_src1
- #yield from self.fp_src2
-
- def ports(self):
- return list(self)
-
-IADD = 0
-ISUB = 1
-
-class RegSim:
- def __init__(self, rwidth, nregs):
- self.rwidth = rwidth
- self.regs = [0] * nregs
-
- def op(self, op, src1, src2, dest):
- src1 = self.regs[src1]
- src2 = self.regs[src2]
- if op == IADD:
- val = (src1 + src2) & ((1<<(self.rwidth))-1)
- elif op == ISUB:
- val = (src1 - src2) & ((1<<(self.rwidth))-1)
- self.regs[dest] = val
-
- def setval(self, dest, val):
- self.regs[dest] = val
-
- def dump(self, dut):
- for i, val in enumerate(self.regs):
- reg = yield dut.intregs.regs[i].reg
- okstr = "OK" if reg == val else "!ok"
- print("reg %d expected %x received %x %s" % (i, val, reg, okstr))
-
- def check(self, dut):
- for i, val in enumerate(self.regs):
- reg = yield dut.intregs.regs[i].reg
- if reg != val:
- print("reg %d expected %x received %x\n" % (i, val, reg))
- yield from self.dump(dut)
- assert False
-
-def int_instr(dut, alusim, op, src1, src2, dest):
- for i in range(len(dut.int_insn_i)):
- yield dut.int_insn_i[i].eq(0)
- yield dut.int_dest_i.eq(dest)
- yield dut.int_src1_i.eq(src1)
- yield dut.int_src2_i.eq(src2)
- yield dut.int_insn_i[op].eq(1)
- alusim.op(op, src1, src2, dest)
-
-
-def print_reg(dut, rnums):
- rs = []
- for rnum in rnums:
- reg = yield dut.intregs.regs[rnum].reg
- rs.append("%x" % reg)
- rnums = map(str, rnums)
- print ("reg %s: %s" % (','.join(rnums), ','.join(rs)))
-
-
-def scoreboard_sim(dut, alusim):
- yield dut.int_store_i.eq(0)
-
- for i in range(1, dut.n_regs):
- yield dut.intregs.regs[i].reg.eq(i)
- alusim.setval(i, i)
-
- if False:
- yield from int_instr(dut, alusim, IADD, 4, 3, 5)
- yield from print_reg(dut, [3,4,5])
- yield
- yield from int_instr(dut, alusim, IADD, 5, 2, 5)
- yield from print_reg(dut, [3,4,5])
- yield
- yield from int_instr(dut, alusim, ISUB, 5, 1, 3)
- yield from print_reg(dut, [3,4,5])
- yield
- for i in range(len(dut.int_insn_i)):
- yield dut.int_insn_i[i].eq(0)
- yield from print_reg(dut, [3,4,5])
- yield
- yield from print_reg(dut, [3,4,5])
- yield
- yield from print_reg(dut, [3,4,5])
- yield
-
- yield from alusim.check(dut)
-
- for i in range(2):
- src1 = randint(1, dut.n_regs-1)
- src2 = randint(1, dut.n_regs-1)
- while True:
- dest = randint(1, dut.n_regs-1)
- break
- if dest not in [src1, src2]:
- break
- op = randint(0, 1)
- if False:
- if i % 2 == 0:
- src1 = 6
- src2 = 6
- dest = 1
- else:
- src1 = 1
- src2 = 7
- dest = 2
- #src1 = 2
- #src2 = 3
- #dest = 2
-
- op = i
-
- if True:
- if i == 0:
- src1 = 2
- src2 = 3
- dest = 3
- else:
- src1 = 5
- src2 = 3
- dest = 4
-
- #op = (i+1) % 2
- op = i
-
- print ("random %d: %d %d %d %d\n" % (i, op, src1, src2, dest))
- yield from int_instr(dut, alusim, op, src1, src2, dest)
- yield from print_reg(dut, [3,4,5])
- while True:
- yield
- issue_o = yield dut.issue_o
- if issue_o:
- yield from print_reg(dut, [3,4,5])
- for i in range(len(dut.int_insn_i)):
- yield dut.int_insn_i[i].eq(0)
- break
- print ("busy",)
- yield from print_reg(dut, [3,4,5])
- yield
- yield
- yield
-
-
- yield
- yield from print_reg(dut, [3,4,5])
- yield
- yield from print_reg(dut, [3,4,5])
- yield
- yield from print_reg(dut, [3,4,5])
- yield
- yield from print_reg(dut, [3,4,5])
- yield
- yield
- yield
- yield
- yield
- yield
- yield
- yield
- yield
- yield from alusim.check(dut)
- yield from alusim.dump(dut)
-
-
-def explore_groups(dut):
- from nmigen.hdl.ir import Fragment
- from nmigen.hdl.xfrm import LHSGroupAnalyzer
-
- fragment = dut.elaborate(platform=None)
- fr = Fragment.get(fragment, platform=None)
-
- groups = LHSGroupAnalyzer()(fragment._statements)
-
- print (groups)
-
-
-def test_scoreboard():
- dut = Scoreboard(16, 8)
- alusim = RegSim(16, 8)
- vl = rtlil.convert(dut, ports=dut.ports())
- with open("test_scoreboard.il", "w") as f:
- f.write(vl)
-
- run_simulation(dut, scoreboard_sim(dut, alusim),
- vcd_name='test_scoreboard.vcd')
-
-
-if __name__ == '__main__':
- test_scoreboard()
projects / soc.git / blobdiff