1 from nmigen
import Module
, Signal
2 from nmigen
.back
.pysim
import Simulator
, Delay
, Settle
3 from nmutil
.formaltest
import FHDLTestCase
4 from nmigen
.cli
import rtlil
6 from soc
.decoder
.isa
.caller
import ISACaller
, special_sprs
7 from soc
.decoder
.power_decoder
import (create_pdecode
)
8 from soc
.decoder
.power_decoder2
import (PowerDecode2
)
9 from soc
.decoder
.power_enums
import (XER_bits
, Function
, InternalOp
, CryIn
)
10 from soc
.decoder
.selectable_int
import SelectableInt
11 from soc
.simulator
.program
import Program
12 from soc
.decoder
.isa
.all
import ISA
15 from soc
.fu
.test
.common
import (TestCase
, ALUHelpers
)
16 from soc
.fu
.spr
.pipeline
import SPRBasePipe
17 from soc
.fu
.spr
.pipe_data
import SPRPipeSpec
21 def get_cu_inputs(dec2
, sim
):
22 """naming (res) must conform to SPRFunctionUnit input regspec
26 yield from ALUHelpers
.get_sim_int_ra(res
, sim
, dec2
) # RA
27 yield from ALUHelpers
.get_sim_int_rb(res
, sim
, dec2
) # RB
28 yield from ALUHelpers
.get_sim_slow_spr1(res
, sim
, dec2
) # FAST1
29 yield from ALUHelpers
.get_sim_fast_spr1(res
, sim
, dec2
) # FAST1
30 yield from ALUHelpers
.get_rd_sim_xer_ca(res
, sim
, dec2
) # XER.ca
31 yield from ALUHelpers
.get_sim_xer_ov(res
, sim
, dec2
) # XER.ov
32 yield from ALUHelpers
.get_sim_xer_so(res
, sim
, dec2
) # XER.so
34 print ("spr get_cu_inputs", res
)
40 def set_alu_inputs(alu
, dec2
, sim
):
41 # TODO: see https://bugs.libre-soc.org/show_bug.cgi?id=305#c43
42 # detect the immediate here (with m.If(self.i.ctx.op.imm_data.imm_ok))
43 # and place it into data_i.b
45 inp
= yield from get_cu_inputs(dec2
, sim
)
46 yield from ALUHelpers
.set_int_ra(alu
, dec2
, inp
)
47 yield from ALUHelpers
.set_xer_ca(alu
, dec2
, inp
)
48 yield from ALUHelpers
.set_xer_ov(alu
, dec2
, inp
)
49 yield from ALUHelpers
.set_xer_so(alu
, dec2
, inp
)
51 yield from ALUHelpers
.set_fast_spr1(alu
, dec2
, inp
)
52 yield from ALUHelpers
.set_slow_spr1(alu
, dec2
, inp
)
55 # This test bench is a bit different than is usual. Initially when I
56 # was writing it, I had all of the tests call a function to create a
57 # device under test and simulator, initialize the dut, run the
58 # simulation for ~2 cycles, and assert that the dut output what it
59 # should have. However, this was really slow, since it needed to
60 # create and tear down the dut and simulator for every test case.
62 # Now, instead of doing that, every test case in SPRTestCase puts some
63 # data into the test_data list below, describing the instructions to
64 # be tested and the initial state. Once all the tests have been run,
65 # test_data gets passed to TestRunner which then sets up the DUT and
66 # simulator once, runs all the data through it, and asserts that the
67 # results match the pseudocode sim at every cycle.
69 # By doing this, I've reduced the time it takes to run the test suite
70 # massively. Before, it took around 1 minute on my computer, now it
71 # takes around 3 seconds
74 class SPRTestCase(FHDLTestCase
):
77 def __init__(self
, name
):
78 super().__init
__(name
)
81 def run_tst_program(self
, prog
, initial_regs
=None, initial_sprs
=None):
82 tc
= TestCase(prog
, self
.test_name
, initial_regs
, initial_sprs
)
83 self
.test_data
.append(tc
)
85 def test_1_mfspr(self
):
86 lst
= ["mfspr 1, 26", # SRR0
89 initial_regs
= [0] * 32
90 initial_sprs
= {'SRR0': 0x12345678, 'SRR1': 0x5678, 'LR': 0x1234}
91 self
.run_tst_program(Program(lst
), initial_regs
, initial_sprs
)
94 pspec
= SPRPipeSpec(id_wid
=2)
95 alu
= SPRBasePipe(pspec
)
96 vl
= rtlil
.convert(alu
, ports
=alu
.ports())
97 with
open("trap_pipeline.il", "w") as f
:
101 class TestRunner(FHDLTestCase
):
102 def __init__(self
, test_data
):
103 super().__init
__("run_all")
104 self
.test_data
= test_data
109 instruction
= Signal(32)
111 pdecode
= create_pdecode()
113 m
.submodules
.pdecode2
= pdecode2
= PowerDecode2(pdecode
)
115 pspec
= SPRPipeSpec(id_wid
=2)
116 m
.submodules
.alu
= alu
= SPRBasePipe(pspec
)
118 comb
+= alu
.p
.data_i
.ctx
.op
.eq_from_execute1(pdecode2
.e
)
119 comb
+= alu
.p
.valid_i
.eq(1)
120 comb
+= alu
.n
.ready_i
.eq(1)
121 comb
+= pdecode2
.dec
.raw_opcode_in
.eq(instruction
)
126 for test
in self
.test_data
:
127 print("test", test
.name
)
128 print ("sprs", test
.sprs
)
129 program
= test
.program
130 self
.subTest(test
.name
)
131 sim
= ISA(pdecode2
, test
.regs
, test
.sprs
, test
.cr
,
133 gen
= program
.generate_instructions()
134 instructions
= list(zip(gen
, program
.assembly
.splitlines()))
136 pc
= sim
.pc
.CIA
.value
138 while index
< len(instructions
):
139 ins
, code
= instructions
[index
]
141 print("pc %08x instr: %08x" % (pc
, ins
& 0xffffffff))
145 so
= 1 if sim
.spr
['XER'][XER_bits
['SO']] else 0
146 ov
= 1 if sim
.spr
['XER'][XER_bits
['OV']] else 0
147 ov32
= 1 if sim
.spr
['XER'][XER_bits
['OV32']] else 0
148 print ("before: so/ov/32", so
, ov
, ov32
)
150 # ask the decoder to decode this binary data (endian'd)
151 yield pdecode2
.dec
.bigendian
.eq(0) # little / big?
152 yield instruction
.eq(ins
) # raw binary instr.
155 fast_in
= yield pdecode2
.e
.read_fast1
.data
156 spr_in
= yield pdecode2
.e
.read_spr1
.data
157 print ("dec2 spr/fast in", fast_in
, spr_in
)
159 fast_out
= yield pdecode2
.e
.write_fast1
.data
160 spr_out
= yield pdecode2
.e
.write_spr
.data
161 print ("dec2 spr/fast in", fast_out
, spr_out
)
163 fn_unit
= yield pdecode2
.e
.do
.fn_unit
164 self
.assertEqual(fn_unit
, Function
.SPR
.value
)
165 yield from set_alu_inputs(alu
, pdecode2
, sim
)
167 opname
= code
.split(' ')[0]
168 yield from sim
.call(opname
)
169 pc
= sim
.pc
.CIA
.value
171 print("pc after %08x" % (pc
))
173 vld
= yield alu
.n
.valid_o
176 vld
= yield alu
.n
.valid_o
179 yield from self
.check_alu_outputs(alu
, pdecode2
, sim
, code
)
181 sim
.add_sync_process(process
)
182 with sim
.write_vcd("alu_simulator.vcd", "simulator.gtkw",
186 def check_alu_outputs(self
, alu
, dec2
, sim
, code
):
188 rc
= yield dec2
.e
.do
.rc
.data
189 cridx_ok
= yield dec2
.e
.write_cr
.ok
190 cridx
= yield dec2
.e
.write_cr
.data
192 print ("check extra output", repr(code
), cridx_ok
, cridx
)
194 self
.assertEqual(cridx
, 0, code
)
199 yield from ALUHelpers
.get_int_o(res
, alu
, dec2
)
200 yield from ALUHelpers
.get_fast_spr1(res
, alu
, dec2
)
201 yield from ALUHelpers
.get_slow_spr1(res
, alu
, dec2
)
202 yield from ALUHelpers
.get_xer_ov(res
, alu
, dec2
)
203 yield from ALUHelpers
.get_xer_ca(res
, alu
, dec2
)
204 yield from ALUHelpers
.get_xer_so(res
, alu
, dec2
)
206 print ("output", res
)
208 yield from ALUHelpers
.get_sim_int_o(sim_o
, sim
, dec2
)
209 yield from ALUHelpers
.get_wr_sim_cr_a(sim_o
, sim
, dec2
)
210 yield from ALUHelpers
.get_sim_xer_ov(sim_o
, sim
, dec2
)
211 yield from ALUHelpers
.get_wr_sim_xer_ca(sim_o
, sim
, dec2
)
212 yield from ALUHelpers
.get_wr_fast_spr1(sim_o
, sim
, dec2
)
213 yield from ALUHelpers
.get_wr_slow_spr1(sim_o
, sim
, dec2
)
215 ALUHelpers
.check_xer_ov(self
, res
, sim_o
, code
)
216 ALUHelpers
.check_xer_ca(self
, res
, sim_o
, code
)
217 ALUHelpers
.check_int_o(self
, res
, sim_o
, code
)
218 ALUHelpers
.check_fast_spr1(self
, res
, sim_o
, code
)
219 ALUHelpers
.check_slow_spr1(self
, res
, sim_o
, code
)
220 ALUHelpers
.check_xer_so(self
, res
, sim_o
, code
)
223 if __name__
== "__main__":
224 unittest
.main(exit
=False)
225 suite
= unittest
.TestSuite()
226 suite
.addTest(TestRunner(SPRTestCase
.test_data
))
228 runner
= unittest
.TextTestRunner()