+# SPDX-License-Identifier: LGPL-3-or-later
"""Cascading Power ISA Decoder
License: LGPLv3+
from nmigen import Module, Elaboratable, Signal, Cat, Mux, Const
from nmigen.cli import rtlil, verilog
from openpower.decoder.power_enums import (Function, Form, MicrOp,
- In1Sel, In2Sel, In3Sel, OutSel,
- SVEXTRA, SVEtype, SVPtype, # Simple-V
- RC, LdstLen, LDSTMode, CryIn,
- single_bit_flags, CRInSel,
- CROutSel, get_signal_name,
- default_values, insns, asmidx,
- asmlen)
+ In1Sel, In2Sel, In3Sel, OutSel,
+ SVEXTRA, SVEtype, SVPtype, # Simple-V
+ RCOE, LdstLen, LDSTMode, CryIn,
+ single_bit_flags, CRInSel,
+ CROutSel, get_signal_name,
+ default_values, insns, asmidx,
+ asmlen)
from openpower.decoder.power_fields import DecodeFields
from openpower.decoder.power_fieldsn import SigDecode, SignalBitRange
from openpower.decoder.power_svp64 import SVP64RM
"opcodes", # a dictionary of minor patterns to find
"opint", # true => the pattern must not be in "10----11" format
# the bits (as a range) against which "pattern" matches
- "bitsel",
+ "bitsel", # should be in MSB0 order but isn't! it's LSB0. um.
"suffix", # shift the opcode down before decoding
"subdecoders" # list of further subdecoders for *additional* matches,
# *ONLY* after "pattern" has *ALSO* been matched against.
'sv_cr_out': SVEXTRA,
'ldst_len': LdstLen,
'upd': LDSTMode,
- 'rc_sel': RC,
+ 'rc_sel': RCOE,
'cry_in': CryIn
}
'cr_out': 'CR out',
'ldst_len': 'ldst len',
'upd': 'upd',
+ 'rsrv': 'rsrv', # atomic operation
'rc_sel': 'rc',
'cry_in': 'cry in',
}
# process the comment field, strip out "equals" for FP
if "=" in asmcode:
asmcode = asmcode.split("=")[-1]
- log ("asmcode stripping =", asmcode,
- asmcode in asmidx, hasattr(self, "asmcode"))
+ log("asmcode stripping =", asmcode,
+ asmcode in asmidx, hasattr(self, "asmcode"))
if hasattr(self, "asmcode") and asmcode in asmidx:
res.append(self.asmcode.eq(asmidx[asmcode]))
for bit in single_bit_flags:
"""
def __init__(self, width, dec, name=None, col_subset=None,
- row_subset=None, conditions=None):
+ row_subset=None, conditions=None):
if conditions is None:
# XXX conditions = {}
- conditions = {'SVP64BREV': Const(0, 1),
+ conditions = {
'SVP64FFT': Const(0, 1),
- }
+ }
self.actually_does_something = False
self.pname = name
self.conditions = conditions
def find_conditions(self, opcodes):
# look for conditions, create dictionary entries for them
# sorted by opcode
- rows = OrderedDict() # start as a dictionary, get as list (after)
+ rows = OrderedDict() # start as a dictionary, get as list (after)
for row in opcodes:
condition = row['CONDITIONS']
opcode = row['opcode']
if condition:
# check it's expected
assert (condition in self.conditions or
- (condition[0] == '~' and
- condition[1:] in self.conditions)), \
+ (condition[0] == '~' and
+ condition[1:] in self.conditions)), \
"condition %s not in %s" % (condition, str(conditions))
if opcode not in rows:
rows[opcode] = {}
# check it's unique
assert opcode not in rows, \
"opcode %s already in rows for %s" % \
- (opcode, self.pname)
+ (opcode, self.pname)
rows[opcode] = row
# after checking for conditions, get just the values (ordered)
return list(rows.values())
# get the FIRST item (will be the same opcode), and it
# had BETTER have the same unit and also pass other
# row subset conditions.
- if 'opcode' not in row: # must be a "CONDITIONS" dict...
+ if 'opcode' not in row: # must be a "CONDITIONS" dict...
is_conditions = True
_row = row[list(row.keys())[0]]
else:
col_subset=self.col_subset,
row_subset=self.row_subsetfn,
conditions=self.conditions)
- log ("subdecoder", mname, subdecoder)
+ log("subdecoder", mname, subdecoder)
if not subdecoder.tree_analyse(): # doesn't do anything
- log ("analysed, DELETING", mname)
+ log("analysed, DELETING", mname)
del subdecoder
continue # skip
submodules[mname] = subdecoder
"""
def __init__(self, width, dec, name=None, col_subset=None,
- row_subset=None, conditions=None):
+ row_subset=None, conditions=None):
PowerDecoder.__init__(self, width, dec, name,
col_subset, row_subset, conditions)
self.fields = df = DecodeFields(SignalBitRange, [self.opcode_in])
# PRIMARY FUNCTION SPECIFYING ALTERNATIVE SVP64 POWER DECODER
def create_pdecode_svp64_ldst(name=None, col_subset=None, row_subset=None,
- include_fp=False):
+ include_fp=False):
"""create_pdecode - creates a cascading hierarchical POWER ISA decoder
subsetting of the PowerOp decoding is possible by setting col_subset
"""
- log ("create_pdecode_svp64_ldst", name, col_subset, row_subset, include_fp)
+ log("create_pdecode_svp64_ldst", name, col_subset, row_subset, include_fp)
# some alteration to the CSV files is required for SV so we use
# a class to do it
Subdecoder(pattern=58, opcodes=get_csv("svldst_minor_58.csv"),
opint=True, bitsel=(0, 2), suffix=None, subdecoders=[]),
# nope - needs 4-in regs
- #Subdecoder(pattern=62, opcodes=get_csv("svldst_minor_62.csv"),
+ # Subdecoder(pattern=62, opcodes=get_csv("svldst_minor_62.csv"),
# opint=True, bitsel=(0, 2), suffix=None, subdecoders=[]),
]
if False and include_fp:
pminor.append(
Subdecoder(pattern=63, opcodes=get_csv("minor_63.csv"),
- opint=False, bitsel=(1, 11), suffix=None,
- subdecoders=[]),
- )
+ opint=False, bitsel=(1, 11), suffix=None,
+ subdecoders=[]),
+ )
pminor.append(
Subdecoder(pattern=59, opcodes=get_csv("minor_59.csv"),
- opint=False, bitsel=(1, 11), suffix=None,
- subdecoders=[]),
- )
+ opint=False, bitsel=(1, 11), suffix=None,
+ subdecoders=[]),
+ )
# top level: extra merged with major
dec = []
"""create_pdecode - creates a cascading hierarchical POWER ISA decoder
subsetting of the PowerOp decoding is possible by setting col_subset
+
+ NOTE (sigh) the bitsel patterns are in LSB0 order, they should be MSB0
"""
- log ("create_pdecode", name, col_subset, row_subset, include_fp)
+ log("create_pdecode", name, col_subset, row_subset, include_fp)
# some alteration to the CSV files is required for SV so we use
# a class to do it
subdecoders=[]))
# XXX problem with sub-decoders (can only handle one),
# sort this another time
- #m19.append(Subdecoder(pattern=19, opcodes=get_csv("minor_19_00000.csv"),
+ # m19.append(Subdecoder(pattern=19, opcodes=get_csv("minor_19_00000.csv"),
# opint=True, bitsel=(1, 6), suffix=None,
# subdecoders=[]))
pminor = [
m19,
Subdecoder(pattern=30, opcodes=get_csv("minor_30.csv"),
- opint=True, bitsel=(1, 5), suffix=None, subdecoders=[]),
+ opint=False, bitsel=(1, 5), suffix=None, subdecoders=[]),
Subdecoder(pattern=31, opcodes=get_csv("minor_31.csv"),
opint=True, bitsel=(1, 11), suffix=0b00101, subdecoders=[]),
Subdecoder(pattern=58, opcodes=get_csv("minor_58.csv"),
Subdecoder(pattern=62, opcodes=get_csv("minor_62.csv"),
opint=True, bitsel=(0, 2), suffix=None, subdecoders=[]),
Subdecoder(pattern=22, opcodes=get_csv("minor_22.csv"),
- opint=True, bitsel=(1, 5), suffix=None, subdecoders=[]),
+ opint=False, bitsel=(0, 11), suffix=None, subdecoders=[]),
+ Subdecoder(pattern=5, opcodes=get_csv("minor_5.csv"),
+ opint=True, bitsel=(0, 11), suffix=None, subdecoders=[]),
]
# FP 63L/H decoders. TODO: move mffsfamily to separate subdecoder
if include_fp:
pminor.append(
Subdecoder(pattern=63, opcodes=get_csv("minor_63.csv"),
- opint=False, bitsel=(1, 11), suffix=None,
- subdecoders=[]),
- )
+ opint=False, bitsel=(1, 11), suffix=None,
+ subdecoders=[]),
+ )
pminor.append(
Subdecoder(pattern=59, opcodes=get_csv("minor_59.csv"),
- opint=False, bitsel=(1, 11), suffix=None,
- subdecoders=[]),
- )
+ opint=False, bitsel=(1, 11), suffix=None,
+ subdecoders=[]),
+ )
# top level: extra merged with major
dec = []
row_subset=row_subset,
conditions=conditions)
-# test function from
-#https://github.com/apertus-open-source-cinema/naps/blob/9ebbc0/naps/soc/cli.py#L17
+# test function from
+# https://github.com/apertus-open-source-cinema/naps/blob/9ebbc0/naps/soc/cli.py#L17
+
+
def fragment_repr(original):
from textwrap import indent
attrs_str = "\n"
log("row_subset", opcode, row)
return row['unit'] in ['LDST', 'FPU']
- conditions = {'SVP64BREV': Signal(name="svp64brev", reset_less=True),
+ conditions = {
'SVP64FFT': Signal(name="svp64fft", reset_less=True),
- }
+ }
pdecode = create_pdecode(name="rowsub",
col_subset={'opcode', 'function_unit',
- 'asmcode',
+ 'asmcode',
'in2_sel', 'in3_sel'},
row_subset=rowsubsetfn,
include_fp=True,
from nmigen.hdl.ir import Fragment
elaborated = Fragment.get(pdecode, platform=None)
elaborated_repr = fragment_repr(elaborated)
- print (elaborated_repr)
+ print(elaborated_repr)
exit(0)
vl = rtlil.convert(pdecode, ports=pdecode.ports())
with open("decoder_svp64.il", "w") as f:
f.write(vl)
-
-
projects / openpower-isa.git / blobdiff