src/soc/experiment/test/test_loadstore1.py

   1 from nmigen import (C, Module, Signal, Elaboratable, Mux, Cat, Repl, Signal)
   2 from nmigen.cli import main
   3 from nmigen.cli import rtlil
   4 from nmutil.mask import Mask, masked
   5 from nmutil.util import Display
   6 from random import randint, seed
   7 from nmigen.sim import Simulator, Delay, Settle
   8 from nmutil.util import wrap
   9
  10 from soc.config.test.test_pi2ls import pi_ld, pi_st, pi_ldst, wait_busy
  11 #from soc.config.test.test_pi2ls import pi_st_debug
  12 from soc.config.test.test_loadstore import TestMemPspec
  13 from soc.config.loadstore import ConfigMemoryPortInterface
  14
  15 from soc.fu.ldst.loadstore import LoadStore1
  16 from soc.experiment.mmu import MMU
  17 from soc.experiment.test import pagetables
  18
  19 from nmigen.compat.sim import run_simulation
  20
  21 stop = False
  22
  23 def wb_get(wb, mem):
  24     """simulator process for getting memory load requests
  25     """
  26
  27     global stop
  28     assert(stop==False)
  29
  30     while not stop:
  31         while True: # wait for dc_valid
  32             if stop:
  33                 return
  34             cyc = yield (wb.cyc)
  35             stb = yield (wb.stb)
  36             if cyc and stb:
  37                 break
  38             yield
  39         addr = (yield wb.adr) << 3
  40         if addr not in mem:
  41             print ("    WB LOOKUP NO entry @ %x, returning zero" % (addr))
  42
  43         # read or write?
  44         we = (yield wb.we)
  45         if we:
  46             store = (yield wb.dat_w)
  47             sel = (yield wb.sel)
  48             data = mem.get(addr, 0)
  49             # note we assume 8-bit sel, here
  50             res = 0
  51             for i in range(8):
  52                 mask = 0xff << (i*8)
  53                 if sel & (1<<i):
  54                     res |= store & mask
  55                 else:
  56                     res |= data & mask
  57             mem[addr] = res
  58             print ("    DCACHE set %x mask %x data %x" % (addr, sel, res))
  59         else:
  60             data = mem.get(addr, 0)
  61             yield wb.dat_r.eq(data)
  62             print ("    DCACHE get %x data %x" % (addr, data))
  63
  64         yield wb.ack.eq(1)
  65         yield
  66         yield wb.ack.eq(0)
  67         yield
  68
  69 def setup_mmu():
  70
  71     global stop
  72     stop = False
  73
  74     pspec = TestMemPspec(ldst_ifacetype='mmu_cache_wb',
  75                          imem_ifacetype='',
  76                          addr_wid=48,
  77                          #disable_cache=True, # hmmm...
  78                          mask_wid=8,
  79                          reg_wid=64)
  80
  81     m = Module()
  82     comb = m.d.comb
  83     cmpi = ConfigMemoryPortInterface(pspec)
  84     m.submodules.ldst = ldst = cmpi.pi
  85     m.submodules.mmu = mmu = MMU()
  86     dcache = ldst.dcache
  87
  88     l_in, l_out = mmu.l_in, mmu.l_out
  89     d_in, d_out = dcache.d_in, dcache.d_out
  90     wb_out, wb_in = dcache.wb_out, dcache.wb_in
  91
  92     # link mmu and dcache together
  93     m.d.comb += dcache.m_in.eq(mmu.d_out) # MMUToDCacheType
  94     m.d.comb += mmu.d_in.eq(dcache.m_out) # DCacheToMMUType
  95
  96     # link ldst and MMU together
  97     comb += l_in.eq(ldst.m_out)
  98     comb += ldst.m_in.eq(l_out)
  99
 100     return m, cmpi
 101
 102 test_exceptions = True
 103 test_invalid = False
 104
 105 def _test_loadstore1(dut, mem):
 106     mmu = dut.submodules.mmu
 107     pi = dut.submodules.ldst.pi
 108     global stop
 109     stop = False
 110
 111     if test_invalid:
 112         print("=== test invalid ===")
 113         # no process table for this test
 114         yield mmu.rin.prtbl.eq(0) # set process table
 115         yield
 116         addr = 0
 117         ld_data, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 118         print("ld_data",ld_data,exc)
 119         assert(exc=="slow")
 120         invalid = yield pi.exc_o.invalid
 121         assert(invalid==1)
 122         print("=== test invalid done ===")
 123
 124     yield mmu.rin.prtbl.eq(0x1000000) # set process table
 125     yield
 126
 127     addr = 0x100e0
 128     data = 0xf553b658ba7e1f51
 129
 130     yield from pi_st(pi, addr, data, 8, msr_pr=1)
 131     yield
 132
 133     ld_data, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 134     assert ld_data == 0xf553b658ba7e1f51
 135     assert exc is None
 136     ld_data, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 137     assert ld_data == 0xf553b658ba7e1f51
 138     assert exc is None
 139
 140     print("do_dcbz ===============")
 141     yield from pi_st(pi, addr, data, 8, msr_pr=1, is_dcbz=1)
 142     print("done_dcbz ===============")
 143     yield
 144
 145     ld_data, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 146     print("ld_data after dcbz")
 147     print(ld_data)
 148     assert ld_data == 0
 149     assert exc is None
 150
 151     if test_exceptions:
 152         print("=== alignment error (ld) ===")
 153         addr = 0xFF100e0FF
 154         ld_data, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 155         alignment = yield pi.exc_o.alignment
 156         happened = yield pi.exc_o.happened
 157         dar = yield pi.dar_o
 158         assert(happened==1)
 159         assert(alignment==1)
 160         assert(dar==addr)
 161         assert(exc=="fast")
 162         yield from wait_busy(pi, debug="pi_ld_E_alignment_error")
 163         # wait is only needed in case of in exception here
 164         print("=== alignment error test passed (ld) ===")
 165
 166         print("=== alignment error (st) ===")
 167         addr = 0xFF100e0FF
 168         exc = yield from pi_st(pi, addr,0, 8, msr_pr=1)
 169         alignment = yield pi.exc_o.alignment
 170         happened = yield pi.exc_o.happened
 171         dar = yield pi.dar_o
 172         assert(happened==1)
 173         assert(alignment==1)
 174         assert(dar==addr)
 175         assert(exc=="fast")
 176         yield from wait_busy(pi, debug="pi_st_E_alignment_error")
 177         # wait is only needed in case of in exception here
 178         print("=== alignment error test passed (st) ===")
 179         yield # IMPORTANT: wait one clock cycle after failed st
 180
 181         print("=== no error ===")
 182         addr = 0x100e0
 183         ld_data, exc = yield from pi_ld(pi, addr, 8, msr_pr=1)
 184         print("ld_data",ld_data,exc)
 185         print("=== no error done ===")
 186
 187     stop = True
 188
 189 def test_loadstore1():
 190
 191     m, cmpi = setup_mmu()
 192
 193     mem = pagetables.test1
 194
 195     # nmigen Simulation
 196     sim = Simulator(m)
 197     sim.add_clock(1e-6)
 198
 199     sim.add_sync_process(wrap(_test_loadstore1(m, mem)))
 200     sim.add_sync_process(wrap(wb_get(cmpi.wb_bus(), mem)))
 201     with sim.write_vcd('test_loadstore1.vcd'):
 202         sim.run()
 203
 204 if __name__ == '__main__':
 205     test_loadstore1()