1 # SPDX-License-Identifier: LGPLv3+
2 # Copyright (C) 2021 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
3 # Funded by NLnet http://nlnet.nl
5 from openpower
.decoder
.power_enums
import get_csv
, find_wiki_dir
8 # identifies register by type
9 def is_CR_3bit(regname
):
10 return regname
in ['BF', 'BFA']
12 def is_CR_5bit(regname
):
13 return regname
in ['BA', 'BB', 'BC', 'BI', 'BT']
16 return regname
in ['RA', 'RB', 'RC', 'RS', 'RT']
18 def get_regtype(regname
):
19 if is_CR_3bit(regname
):
21 if is_CR_5bit(regname
):
27 def decode_extra(rm
, prefix
=''):
28 # first turn the svp64 rm into a "by name" dict, recording
29 # which position in the RM EXTRA it goes into
30 # also: record if the src or dest was a CR, for sanity-checking
31 # (elwidth overrides on CRs are banned)
32 dest_reg_cr
, src_reg_cr
= False, False
33 svp64_srcreg_byname
= {}
34 svp64_destreg_byname
= {}
37 rfield
= rm
[prefix
+str(i
)]
38 if not rfield
or rfield
== '0':
40 print ("EXTRA field", i
, rfield
)
41 rfield
= rfield
.split(";") # s:RA;d:CR1 etc.
44 # TODO: ignoring s/d makes it impossible to do
46 r
= r
[2:] # ignore s: and d:
48 svp64_destreg_byname
[r
] = i
# dest reg in EXTRA position 0-3
50 svp64_srcreg_byname
[r
] = i
# src reg in EXTRA position 0-3
51 # check the regtype (if CR, record that)
52 regtype
= get_regtype(r
)
53 if regtype
in ['CR_3bit', 'CR_5bit']:
59 return dest_reg_cr
, src_reg_cr
, svp64_srcreg_byname
, svp64_destreg_byname
62 # gets SVP64 ReMap information
64 def __init__(self
, microwatt_format
=False):
65 """SVP64RM: gets micro-opcode information
67 microwatt_format: moves RS to in1 (to match decode1.vhdl)
70 self
.svp64_instrs
= {}
72 for fname
in os
.listdir(pth
):
73 if fname
.startswith("RM") or fname
.startswith("LDSTRM"):
74 for entry
in get_csv(fname
):
76 # move RS from position 1 to position 3, to match
77 # microwatt decode1.vhdl format
78 if entry
['in1'] == 'RS' and entry
['in3'] == 'NONE':
81 self
.instrs
[entry
['insn']] = entry
84 def get_svp64_csv(self
, fname
):
85 # first get the v3.0B entries
88 # now add the RM fields (for each instruction)
90 # *sigh* create extra field "out2" based on LD/ST update
91 # KEEP TRACK HERE https://bugs.libre-soc.org/show_bug.cgi?id=619
92 entry
['out2'] = 'NONE'
93 if entry
['upd'] == '1':
96 # dummy (blank) fields, first
97 entry
.update({'EXTRA0': '0', 'EXTRA1': '0', 'EXTRA2': '0',
99 'SV_Ptype': 'NONE', 'SV_Etype': 'NONE',
100 'sv_cr_in': 'NONE', 'sv_cr_out': 'NONE'})
101 for fname
in ['in1', 'in2', 'in3', 'out', 'out2']:
102 entry
['sv_%s' % fname
] = 'NONE'
104 # is this SVP64-augmented?
105 asmcode
= entry
['comment']
106 if asmcode
not in self
.instrs
:
109 # start updating the fields, merge relevant info
110 svp64
= self
.instrs
[asmcode
]
111 for k
, v
in {'EXTRA0': '0', 'EXTRA1': '1', 'EXTRA2': '2',
113 'SV_Ptype': 'Ptype', 'SV_Etype': 'Etype'}.items():
116 # hmm, we need something more useful: a cross-association
117 # of the in1/2/3 and CR in/out with the EXTRA0-3 fields
118 decode
= decode_extra(entry
, "EXTRA")
119 dest_reg_cr
, src_reg_cr
, svp64_src
, svp64_dest
= decode
121 # now examine in1/2/3/out, create sv_in1/2/3/out
122 for fname
in ['in1', 'in2', 'in3', 'out', 'out2']:
123 regfield
= entry
[fname
]
125 if regfield
== 'RA_OR_ZERO':
127 print (asmcode
, regfield
, fname
, svp64_dest
, svp64_src
)
128 # find the reg in the SVP64 extra map
129 if (fname
in ['out', 'out2'] and regfield
in svp64_dest
):
130 extra_index
= svp64_dest
[regfield
]
131 if (fname
not in ['out', 'out2'] and regfield
in svp64_src
):
132 extra_index
= svp64_src
[regfield
]
133 # ta-daa, we know in1/2/3/out's bit-offset
134 if extra_index
is not None:
135 entry
['sv_%s' % fname
] = "Idx"+str(extra_index
)
137 # TODO: CRs a little tricky, the power_enums.CRInSel is a bit odd.
138 # ignore WHOLE_REG for now
139 cr_in
= entry
['CR in']
141 if cr_in
in svp64_src
:
142 entry
['sv_cr_in'] = "Idx"+str(svp64_src
[cr_in
])
143 elif cr_in
== 'BA_BB':
144 index1
= svp64_src
.get('BA', None)
145 index2
= svp64_src
.get('BB', None)
146 entry
['sv_cr_in'] = "Idx_%d_%d" % (index1
, index2
)
148 # CRout a lot easier. ignore WHOLE_REG for now
149 cr_out
= entry
['CR out']
150 extra_index
= svp64_dest
.get(cr_out
, None)
151 if extra_index
is not None:
152 entry
['sv_cr_out'] = 'Idx%d' % extra_index
154 # more enum-friendly Ptype names. should have done this in
155 # sv_analysis.py, oh well
156 if entry
['SV_Ptype'] == '1P':
157 entry
['SV_Ptype'] = 'P1'
158 if entry
['SV_Ptype'] == '2P':
159 entry
['SV_Ptype'] = 'P2'
160 self
.svp64_instrs
[asmcode
] = entry
164 if __name__
== '__main__':
166 minor_31
= isa
.get_svp64_csv("minor_31.csv")
167 for entry
in minor_31
:
168 if entry
['comment'].startswith('ldu'):
169 print ("entry", entry
)
170 minor_19
= isa
.get_svp64_csv("minor_19.csv")
171 for entry
in minor_19
:
172 if entry
['comment'].startswith('cr'):
174 minor_31
= isa
.get_svp64_csv("minor_31.csv")
175 for entry
in minor_31
: