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import random
from cocotb.binary import BinaryValue
from cocotb_coverage.coverage import CoverCross, CoverPoint
from .data import BAD_PC
from .common import log
class PcTable:
def __init__(self):
self._pcs = {}
def __getitem__(self, group):
if isinstance(group, BinaryValue):
group = group.integer
return self._pcs.get(group, BAD_PC)
def __setitem__(self, group, pc):
assert (pc & 3) == 0
if isinstance(group, BinaryValue):
group = group.integer
self._pcs[group] = pc >> 2
class Memory:
def __init__(self, name, *, word_size, words, start=0):
word_mask = word_size - 1
assert word_size > 0 and (word_mask & word_size) == 0, \
f'{word_size} is not a power of two'
self._data = {}
self._dirty = set()
self._observed = set()
self._start = start
self._words = words
self._word_size = word_size
self._subword_mask = word_mask
self._all_ones = (1 << (8 * word_size)) - 1
@CoverPoint(
f'{name}.read_dirty',
bins = [True, False],
bins_labels = ['dirty', 'clean'],
rel = lambda word_num, dirty: self._test_bin(word_num, self._dirty, dirty),
)
@CoverPoint(
f'{name}.read_observed',
bins = [True, False],
bins_labels = ['multiple_reads', 'first_read'],
rel = lambda word_num, observed: self._test_bin(word_num, self._observed, observed),
)
@CoverCross(
f'{name}.read_dirty_observed',
items = [
f'{name}.read_dirty',
f'{name}.read_observed',
],
ign_bins = [
('dirty', 'first_read'),
],
)
def _read_word(word_num):
if self._expect_in_range(word_num):
self._observed.add(word_num)
word = self._data.get(word_num)
if word is None:
log.warning(f'Uninitialized memory read: {self._addr_repr(word_num)}')
word = self._all_ones
return word
@CoverPoint(
f'{name}.write_dirty',
bins = [True, False],
bins_labels = ['dirty_write', 'clean_write'],
xf = lambda word_num, data: word_num,
rel = lambda word_num, dirty: self._test_bin(word_num, self._observed, dirty),
)
def _write_word(word_num, data):
if self._expect_in_range(word_num):
self._data[word_num] = data
if word_num in self._observed:
self._dirty.add(word_num)
self._read_word = _read_word
self._write_word = _write_word
def read(self, addr):
return self._data[addr >> 2]
def randomize_line(self, addr):
first_word = (addr >> 2) & ~15
for word_num in range(first_word, first_word + 16):
self._write_word(word_num, random.randint(0, self._all_ones))
def __getitem__(self, index):
if not isinstance(index, slice):
return super()[index]
assert index.stop >= index.start
assert (index.stop & self._subword_mask) == 0
assert (index.start & self._subword_mask) == 0
return MemoryRead(self, index.start // self._word_size, index.stop // self._word_size)
def _expect_in_range(self, word_num):
delta = word_num - self._start
in_range = delta >= 0 and delta < self._words
if not in_range:
log.error(f'Bad memory address: {self._addr_repr(word_num)}')
return in_range
def _test_bin(self, word_num, flag_set, flag_bin):
if not self._expect_in_range(word_num):
return False
return (word_num in flag_set) == flag_bin
def _addr_repr(self, word_num):
addr = word_num * self._word_size
return f'0x{addr:08x}'
class MemoryRead:
def __init__(self, mem, start, stop):
self._mem, self._start, self._stop = mem, start, stop
def tobytes(self):
array = bytearray()
for word_num in range(self._start, self._stop):
word = self._mem._read_word(word_num)
array.extend(word.to_bytes(self._mem._word_size, 'little'))
return array
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