3 # License for original copyright mmu.vhdl by microwatt authors: CC4
4 # License for copyrighted modifications made in mmu.py: LGPLv3+
6 # This derivative work although includes CC4 licensed material is
7 # covered by the LGPLv3+
11 based on Anton Blanchard microwatt mmu.vhdl
14 from enum
import Enum
, unique
15 from nmigen
import (C
, Module
, Signal
, Elaboratable
, Mux
, Cat
, Repl
, Signal
)
16 from nmigen
.cli
import main
17 from nmigen
.cli
import rtlil
18 from nmutil
.iocontrol
import RecordObject
19 from nmutil
.byterev
import byte_reverse
20 from nmutil
.mask
import Mask
, masked
21 from nmutil
.util
import Display
23 # NOTE: to use cxxsim, export NMIGEN_SIM_MODE=cxxsim from the shell
24 # Also, check out the cxxsim nmigen branch, and latest yosys from git
25 from nmutil
.sim_tmp_alternative
import Simulator
, Settle
27 from nmutil
.util
import wrap
29 from soc
.experiment
.mem_types
import (LoadStore1ToMMUType
,
35 # Radix Tree Page Directory Entry Record, TODO put this somewhere sensible
36 # v3.0C Book III p1015-1016 section 6.7.10.1
37 class RTPDE(RecordObject
):
38 def __init__(self
, name
=None):
39 super().__init
__(name
=name
)
40 self
.nls
= Signal(5) # Nextded Access Auth bits 59:63 LSB0 0:4
41 self
.rs1
= Signal(3) # Reserved bits 56:58 LSB0 5:7
42 self
.nlb
= Signal(52) # Next Level Base bit 4:55 LSB0 8:59
43 self
.rs2
= Signal(2) # Reserved bit 2:3 LSB0 60:61
44 self
.leaf
= Signal(1) # leaf bit 1 LSB0 62
45 self
.valid
= Signal(1) # valid bit 0 LSB0 63
48 # Radix Tree Page Table Entry Record, TODO put this somewhere sensible
49 # v3.0C Book III p1016 section 6.7.10.2
50 class RTPTE(RecordObject
):
51 def __init__(self
, name
=None):
52 super().__init
__(name
=name
)
53 self
.eaa
= Signal(4) # Encoded Access Auth bits 60:63 LSB0 0:3
54 self
.att
= Signal(2) # Attributes bits 58:59 LSB0 4:5
55 self
.rs1
= Signal(1) # Reserved bit 57 LSB0 6
56 self
.c
= Signal(1) # Change bit 56 LSB0 7
57 self
.r
= Signal(1) # Reference bit 55 LSB0 8
58 self
.sw
= Signal(3) # SW bits 1:3 bits 52:54 LSB0 9:11
59 self
.rpn
= Signal(45) # Real Page Number bits 7:51 LSB0 12:56
60 self
.rs2
= Signal(4) # Reserved bit 3:6 LSB0 57-60
61 self
.sw0
= Signal(1) # SW bit 0 bit 2 LSB0 61
62 self
.leaf
= Signal(1) # leaf bit 1 LSB0 62
63 self
.valid
= Signal(1) # valid bit 0 LSB0 63
65 # and these... which of course are turned round to LSB0 order.
66 # TODO: sigh. use botchify and put them in openpower.consts
67 EAA_PRIV
= 3 # bit 0 (in MSB0) set ==> problem-state banned (priv=1 only)
68 EAA_RD
= 2 # bit 1 (in MSB0) set ==> loads are permitted
69 EAA_WR
= 1 # bit 2 (in MSB0) set ==> load and stores permitted
70 EAA_EXE
= 0 # bit 3 (in MSB0) set ==> execute permitted
73 display_invalid
= True
77 IDLE
= 0 # zero is default on reset for r.state
89 # Process Table Record - near-identical to Page Table Record (same format)
90 # v3.0C Book III Section 6.7.6.2 p1004
91 class PRTBL(RecordObject
):
92 def __init__(self
, name
=None):
93 super().__init
__(name
=name
)
94 self
.rpds
= Signal(5) # Root Page Directory Size 59:63 LSB0 0:4
95 self
.rts2
= Signal(3) # Radix Tree Size part 2 56:58 LSB0 5:7
96 self
.rpdb
= Signal(52) # Root Page Directory Base 4:55 LSB0 8:59
97 self
.rsv2
= Signal(1) # reserved 3 LSB0 60
98 self
.rts1
= Signal(2) # Radix Tree Size part 1 1:2 LSB0 61:62
99 self
.rsv1
= Signal(1) # reserved 0 LSB0 63
102 class RegStage(RecordObject
):
103 def __init__(self
, name
=None):
104 super().__init
__(name
=name
)
105 # latched request from loadstore1
106 self
.valid
= Signal()
107 self
.iside
= Signal()
108 self
.store
= Signal()
110 self
.addr
= Signal(64)
111 self
.inval_all
= Signal()
114 self
.prtbl
= Signal(64)
115 self
.pid
= Signal(32)
118 self
.state
= Signal(State
) # resets to IDLE
122 # there are 4 quadrants (0-3): here we only support 2 (pt0 and pt3)
123 # these are bits 62-63 of any given address.
124 # except in segment_check, bit 62 is ignored
125 self
.pgtbl0
= Signal(64)
126 self
.pt0_valid
= Signal()
127 self
.pgtbl3
= Signal(64)
128 self
.pt3_valid
= Signal()
130 self
.shift
= Signal(6)
131 self
.mask_size
= Signal(5)
132 self
.pgbase
= Signal(56)
133 self
.pde
= Signal(64)
134 self
.invalid
= Signal()
135 self
.badtree
= Signal()
136 self
.segerror
= Signal()
137 self
.perm_err
= Signal()
138 self
.rc_error
= Signal()
141 # Page Table Record - note that HR bit is treated as part of rts below
142 # (near-identical to Process Table Record - same format)
143 # v3.0C Book III Section 6.7.6.1 p1003
144 class PGTBL(RecordObject
):
145 def __init__(self
, name
=None):
146 super().__init
__(name
=name
)
147 self
.rpds
= Signal(5) # Root Page Directory Size 59:63 LSB0 0:4
148 self
.rts2
= Signal(3) # Radix Tree Size part 2 56:58 LSB0 5:7
149 self
.rpdb
= Signal(52) # Root Page Directory Base 4:55 LSB0 8:59
150 self
.s
= Signal(1) # Host Secure 3 LSB0 60
151 self
.rts1
= Signal(2) # Radix Tree Size part 1 1:2 LSB0 61:62
152 self
.hr
= Signal(1) # Host Radix 0 LSB0 63
155 class MMU(Elaboratable
):
158 Supports 4-level trees as in arch 3.0B, but not the
159 two-step translation for guests under a hypervisor
160 (i.e. there is no gRA -> hRA translation).
163 self
.l_in
= LoadStore1ToMMUType("l_in")
164 self
.l_out
= MMUToLoadStore1Type("l_out")
165 self
.d_out
= MMUToDCacheType("d_out")
166 self
.d_in
= DCacheToMMUType("d_in")
167 self
.i_out
= MMUToICacheType("i_out")
169 def radix_tree_idle(self
, m
, l_in
, r
, v
):
174 pgtbl
= PGTBL("pgtbl")
178 with m
.If(l_in
.addr
[63]): # quadrant 3
179 comb
+= pgtbl
.eq(r
.pgtbl3
)
180 comb
+= pt_valid
.eq(r
.pt3_valid
)
182 comb
+= pgtbl
.eq(r
.pgtbl0
)
183 comb
+= pt_valid
.eq(r
.pt0_valid
)
185 # rts == radix tree size, number of address bits
186 # being translated. takes bits 5:7 and 61:63
187 comb
+= rts
.eq(Cat(pgtbl
.rts2
, pgtbl
.rts1
, pgtbl
.hr
))
189 # mbits == number of address bits to index top
190 # level of tree. takes bits 0:4
191 comb
+= mbits
.eq(pgtbl
.rpds
)
193 # set v.shift to rts so that we can use finalmask
194 # for the segment check.
195 # note: rpdb (52 bits long) is truncated to 48 bits
196 comb
+= v
.shift
.eq(rts
)
197 comb
+= v
.mask_size
.eq(mbits
[0:5])
198 comb
+= v
.pgbase
.eq(Cat(C(0, 8), pgtbl
.rpdb
[:48])) # bits 8:55
200 with m
.If(l_in
.valid
):
201 comb
+= v
.addr
.eq(l_in
.addr
)
202 comb
+= v
.iside
.eq(l_in
.iside
)
203 comb
+= v
.store
.eq(~
(l_in
.load | l_in
.iside
))
204 comb
+= v
.priv
.eq(l_in
.priv
)
206 comb
+= Display("state %d l_in.valid addr %x iside %d store %d "
207 "rts %x mbits %x pt_valid %d",
208 v
.state
, v
.addr
, v
.iside
, v
.store
,
209 rts
, mbits
, pt_valid
)
211 with m
.If(l_in
.tlbie
):
212 # Invalidate all iTLB/dTLB entries for
213 # tlbie with RB[IS] != 0 or RB[AP] != 0,
215 comb
+= v
.inval_all
.eq(l_in
.slbia
222 # The RIC field of the tlbie instruction
223 # comes across on the sprn bus as bits 2--3.
224 # RIC=2 flushes process table caches.
225 with m
.If(l_in
.sprn
[3]):
226 comb
+= v
.pt0_valid
.eq(0)
227 comb
+= v
.pt3_valid
.eq(0)
228 comb
+= v
.state
.eq(State
.DO_TLBIE
)
230 comb
+= v
.valid
.eq(1)
231 with m
.If(~pt_valid
):
232 # need to fetch process table entry
233 # set v.shift so we can use finalmask
234 # for generating the process table
236 prtbl
= PRTBL("prtbl")
237 comb
+= prtbl
.eq(r
.prtbl
)
238 comb
+= v
.shift
.eq(prtbl
.rpds
)
239 comb
+= v
.state
.eq(State
.PROC_TBL_READ
)
241 with m
.Elif(mbits
== 0):
242 # Use RPDS = 0 to disable radix tree walks
243 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
244 comb
+= v
.invalid
.eq(1)
246 sync
+= Display("MMUBUG: Use RPDS = 0 to disable"
249 comb
+= v
.state
.eq(State
.SEGMENT_CHECK
)
251 with m
.If(l_in
.mtspr
):
252 # Move to PID needs to invalidate L1 TLBs
253 # and cached pgtbl0 value. Move to PRTBL
254 # does that plus invalidating the cached
255 # pgtbl3 value as well.
256 with m
.If(~l_in
.sprn
[9]):
257 comb
+= v
.pid
.eq(l_in
.rs
[0:32])
259 comb
+= v
.prtbl
.eq(l_in
.rs
)
260 comb
+= v
.pt3_valid
.eq(0)
262 comb
+= v
.pt0_valid
.eq(0)
263 comb
+= v
.inval_all
.eq(1)
264 comb
+= v
.state
.eq(State
.DO_TLBIE
)
266 def proc_tbl_wait(self
, m
, v
, r
, data
):
268 with m
.If(r
.addr
[63]): # top bit of quadrant selects pt3
269 comb
+= v
.pgtbl3
.eq(data
)
270 comb
+= v
.pt3_valid
.eq(1)
272 comb
+= v
.pgtbl0
.eq(data
)
273 comb
+= v
.pt0_valid
.eq(1)
278 # rts == radix tree size, # address bits being translated
279 comb
+= rts
.eq(Cat(data
[5:8], data
[61:63]))
281 # mbits == # address bits to index top level of tree
282 comb
+= mbits
.eq(data
[0:5])
284 # set v.shift to rts so that we can use finalmask for the segment check
285 comb
+= v
.shift
.eq(rts
)
286 comb
+= v
.mask_size
.eq(mbits
[0:5])
287 comb
+= v
.pgbase
.eq(Cat(C(0, 8), data
[8:56]))
290 comb
+= v
.state
.eq(State
.SEGMENT_CHECK
)
292 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
293 comb
+= v
.invalid
.eq(1)
294 if(display_invalid
): m
.d
.sync
+= Display("MMUBUG: mbits is invalid")
296 def radix_read_wait(self
, m
, v
, r
, d_in
, data
):
300 rpte
= RTPTE(name
="radix_rpte") # page-table (leaf) entry
301 rpde
= RTPDE(name
="radix_rpde") # page-directory (non-leaf) entry
311 comb
+= Display("RDW %016x done %d "
312 "perm %d rc %d mbits %d shf %d "
313 "valid %d leaf %d bad %d",
314 data
, d_in
.done
, perm_ok
, rc_ok
,
315 mbits
, r
.shift
, valid
, leaf
, badtree
)
317 # set pde and interpret as Radix Tree Page Table Entry (leaf=1 case)
318 comb
+= v
.pde
.eq(data
)
319 comb
+= rpte
.eq(data
)
320 comb
+= rpde
.eq(data
)
323 # valid & leaf: RADIX Page-Table Entry
325 # check permissions and RC bits
326 with m
.If(r
.priv | ~eaa
[EAA_PRIV
]):
328 comb
+= perm_ok
.eq(eaa
[EAA_WR
] |
329 (eaa
[EAA_RD
] & ~r
.store
))
331 # no IAMR, so no KUEP support for now
332 # deny execute permission if cache inhibited
333 comb
+= perm_ok
.eq(eaa
[EAA_EXE
] & ~rpte
.att
[1])
334 comb
+= rc_ok
.eq(rpte
.r
& (rpte
.c | ~r
.store
))
336 # permissions / rc ok, load TLB, otherwise report error
337 with m
.If(perm_ok
& rc_ok
):
338 comb
+= v
.state
.eq(State
.RADIX_LOAD_TLB
)
340 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
341 comb
+= v
.perm_err
.eq(~perm_ok
)
342 # permission error takes precedence over RC error
343 comb
+= v
.rc_error
.eq(perm_ok
)
345 # valid & !leaf: RADIX Page-Directory Entry
347 comb
+= mbits
.eq(rpde
.nls
) # 5 bits NLS into 6-bit-long mbits
348 comb
+= badtree
.eq((mbits
< 5) |
352 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
353 comb
+= v
.badtree
.eq(1)
355 comb
+= v
.shift
.eq(r
.shift
- mbits
)
356 comb
+= v
.mask_size
.eq(mbits
)
357 # pagebase is first 48 bits of NLB, shifted up 1 byte
358 comb
+= v
.pgbase
.eq(Cat(C(0, 8), rpde
.nlb
[:48]))
359 comb
+= v
.state
.eq(State
.RADIX_LOOKUP
)
362 # non-present PTE, generate a DSI
363 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
364 comb
+= v
.invalid
.eq(1)
366 sync
+= Display("MMUBUG: non-present PTE, generate a DSI")
368 def segment_check(self
, m
, v
, r
, data
, finalmask
):
373 comb
+= mbits
.eq(r
.mask_size
)
374 comb
+= v
.shift
.eq(r
.shift
+ (31 - 12) - mbits
)
375 comb
+= nonzero
.eq((r
.addr
[31:62] & ~finalmask
[0:31]).bool())
376 with m
.If((r
.addr
[63] ^ r
.addr
[62]) # pt3 == 0b11 and pt1 == 0b00
378 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
379 comb
+= v
.segerror
.eq(1)
380 with m
.Elif((mbits
< 5) |
(mbits
> 16) |
381 (mbits
> (r
.shift
+ (31-12)))):
382 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
383 comb
+= v
.badtree
.eq(1)
385 comb
+= v
.state
.eq(State
.RADIX_LOOKUP
)
387 def mmu_0(self
, m
, r
, rin
, l_in
, l_out
, d_out
, addrsh
, mask
):
391 # Multiplex internal SPR values back to loadstore1,
392 # selected by l_in.sprn.
393 with m
.If(l_in
.sprn
[9]):
394 comb
+= l_out
.sprval
.eq(r
.prtbl
)
396 comb
+= l_out
.sprval
.eq(r
.pid
)
398 with m
.If(rin
.valid
):
399 sync
+= Display("MMU got tlb miss for %x", rin
.addr
)
401 with m
.If(l_out
.done
):
402 sync
+= Display("MMU completing op without error")
404 with m
.If(l_out
.err
):
405 sync
+= Display("MMU completing op with err invalid="
406 "%d badtree=%d", l_out
.invalid
, l_out
.badtree
)
408 with m
.If(rin
.state
== State
.RADIX_LOOKUP
):
409 sync
+= Display ("radix lookup shift=%d msize=%d",
410 rin
.shift
, rin
.mask_size
)
412 with m
.If(r
.state
== State
.RADIX_LOOKUP
):
413 sync
+= Display(f
"send load addr=%x addrsh=%d mask=%x",
414 d_out
.addr
, addrsh
, mask
)
417 def elaborate(self
, platform
):
425 finalmask
= Signal(44)
427 self
.rin
= rin
= RegStage("r_in")
430 # get access to prtbl and pid for debug / testing purposes ONLY
431 # (actually, not needed, because setup_regs() triggers mmu direct)
432 # self._prtbl = r.prtbl
441 self
.mmu_0(m
, r
, rin
, l_in
, l_out
, d_out
, addrsh
, mask
)
450 prtb_adr
= Signal(64)
451 pgtb_adr
= Signal(64)
453 tlb_data
= Signal(64)
457 comb
+= v
.valid
.eq(0)
461 comb
+= v
.invalid
.eq(0)
462 comb
+= v
.badtree
.eq(0)
463 comb
+= v
.segerror
.eq(0)
464 comb
+= v
.perm_err
.eq(0)
465 comb
+= v
.rc_error
.eq(0)
466 comb
+= tlb_load
.eq(0)
467 comb
+= itlb_load
.eq(0)
468 comb
+= tlbie_req
.eq(0)
469 comb
+= v
.inval_all
.eq(0)
470 comb
+= prtbl_rd
.eq(0)
472 # Radix tree data structures in memory are
473 # big-endian, so we need to byte-swap them
474 data
= byte_reverse(m
, "data", d_in
.data
, 8)
476 # generate mask for extracting address fields for PTE addr generation
477 m
.submodules
.pte_mask
= pte_mask
= Mask(16-5)
478 comb
+= pte_mask
.shift
.eq(r
.mask_size
- 5)
479 comb
+= mask
.eq(Cat(C(0x1f, 5), pte_mask
.mask
))
481 # generate mask for extracting address bits to go in
482 # TLB entry in order to support pages > 4kB
483 m
.submodules
.tlb_mask
= tlb_mask
= Mask(44)
484 comb
+= tlb_mask
.shift
.eq(r
.shift
)
485 comb
+= finalmask
.eq(tlb_mask
.mask
)
487 with m
.If(r
.state
!= State
.IDLE
):
488 sync
+= Display("MMU state %d %016x", r
.state
, data
)
494 with m
.Switch(r
.state
):
495 with m
.Case(State
.IDLE
):
496 self
.radix_tree_idle(m
, l_in
, r
, v
)
498 with m
.Case(State
.DO_TLBIE
):
500 comb
+= tlbie_req
.eq(1)
501 comb
+= v
.state
.eq(State
.TLB_WAIT
)
503 with m
.Case(State
.TLB_WAIT
):
504 with m
.If(d_in
.done
):
505 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
507 with m
.Case(State
.PROC_TBL_READ
):
508 sync
+= Display(" TBL_READ %016x", prtb_adr
)
510 comb
+= prtbl_rd
.eq(1)
511 comb
+= v
.state
.eq(State
.PROC_TBL_WAIT
)
513 with m
.Case(State
.PROC_TBL_WAIT
):
514 with m
.If(d_in
.done
):
515 self
.proc_tbl_wait(m
, v
, r
, data
)
518 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
519 comb
+= v
.badtree
.eq(1)
521 with m
.Case(State
.SEGMENT_CHECK
):
522 self
.segment_check(m
, v
, r
, data
, finalmask
)
524 with m
.Case(State
.RADIX_LOOKUP
):
525 sync
+= Display(" RADIX_LOOKUP")
527 comb
+= v
.state
.eq(State
.RADIX_READ_WAIT
)
529 with m
.Case(State
.RADIX_READ_WAIT
):
530 sync
+= Display(" READ_WAIT")
531 with m
.If(d_in
.done
):
532 self
.radix_read_wait(m
, v
, r
, d_in
, data
)
534 comb
+= v
.state
.eq(State
.RADIX_FINISH
)
535 comb
+= v
.badtree
.eq(1)
537 with m
.Case(State
.RADIX_LOAD_TLB
):
538 comb
+= tlb_load
.eq(1)
541 comb
+= v
.state
.eq(State
.TLB_WAIT
)
543 comb
+= itlb_load
.eq(1)
544 comb
+= v
.state
.eq(State
.IDLE
)
546 with m
.Case(State
.RADIX_FINISH
):
547 sync
+= Display(" RADIX_FINISH")
548 comb
+= v
.state
.eq(State
.IDLE
)
550 # check and report either error or done.
551 with m
.If((v
.state
== State
.RADIX_FINISH
) |
552 ((v
.state
== State
.RADIX_LOAD_TLB
) & r
.iside
)):
553 comb
+= v
.err
.eq(v
.invalid | v
.badtree | v
.segerror
554 | v
.perm_err | v
.rc_error
)
555 comb
+= v
.done
.eq(~v
.err
)
557 # PID is only valid if MSB of address is zero, top 2 bits are Quadrant
558 with m
.If(~r
.addr
[63]): # quadrant 0 (pt0)
559 comb
+= effpid
.eq(r
.pid
)
561 # calculate Process Table Address
562 pr24
= Signal(24, reset_less
=True)
563 prtbla
= PRTBL("prtbla")
564 comb
+= prtbla
.eq(r
.prtbl
)
566 comb
+= pr24
.eq(masked(rpdb
[4:28], effpid
[8:32], finalmask
))
567 comb
+= prtb_adr
.eq(Cat(C(0, 4), effpid
[0:8], pr24
, rpdb
[28:48]))
569 # calculate Page Table Address
570 pg16
= Signal(16, reset_less
=True)
571 comb
+= pg16
.eq(masked(r
.pgbase
[3:19], addrsh
, mask
))
572 comb
+= pgtb_adr
.eq(Cat(C(0, 3), pg16
, r
.pgbase
[19:56]))
574 # calculate Page Table Entry from Real Page Number (leaf=1, RTPTE)
575 rpte
= RTPTE(name
="rpte")
576 comb
+= rpte
.eq(r
.pde
)
577 pd44
= Signal(44, reset_less
=True)
578 comb
+= pd44
.eq(masked(rpte
.rpn
, r
.addr
[12:56], finalmask
))
579 comb
+= pte
.eq(Cat(r
.pde
[0:12], pd44
))
585 with m
.If(tlbie_req
):
586 comb
+= addr
.eq(r
.addr
)
587 with m
.Elif(tlb_load
):
588 comb
+= addr
.eq(Cat(C(0, 12), r
.addr
[12:64]))
589 comb
+= tlb_data
.eq(pte
)
590 with m
.Elif(prtbl_rd
):
591 comb
+= addr
.eq(prtb_adr
)
593 comb
+= addr
.eq(pgtb_adr
)
595 # connect to other interfaces: LDST, D-Cache, I-Cache
596 comb
+= l_out
.done
.eq(r
.done
)
597 comb
+= l_out
.err
.eq(r
.err
)
598 comb
+= l_out
.invalid
.eq(r
.invalid
)
599 comb
+= l_out
.badtree
.eq(r
.badtree
)
600 comb
+= l_out
.segerr
.eq(r
.segerror
)
601 comb
+= l_out
.perm_error
.eq(r
.perm_err
)
602 comb
+= l_out
.rc_error
.eq(r
.rc_error
)
604 comb
+= d_out
.valid
.eq(dcreq
)
605 comb
+= d_out
.tlbie
.eq(tlbie_req
)
606 comb
+= d_out
.doall
.eq(r
.inval_all
)
607 comb
+= d_out
.tlbld
.eq(tlb_load
)
608 comb
+= d_out
.addr
.eq(addr
)
609 comb
+= d_out
.pte
.eq(tlb_data
)
611 comb
+= i_out
.tlbld
.eq(itlb_load
)
612 comb
+= i_out
.tlbie
.eq(tlbie_req
)
613 comb
+= i_out
.doall
.eq(r
.inval_all
)
614 comb
+= i_out
.addr
.eq(addr
)
615 comb
+= i_out
.pte
.eq(tlb_data
)
622 """simulator process for getting memory load requests
628 return int.from_bytes(x
.to_bytes(8, byteorder
='little'),
629 byteorder
='big', signed
=False)
631 mem
= {0x0: 0x000000, # to get mtspr prtbl working
633 0x10000: # PARTITION_TABLE_2
634 # PATB_GR=1 PRTB=0x1000 PRTS=0xb
635 b(0x800000000100000b),
637 0x30000: # RADIX_ROOT_PTE
638 # V = 1 L = 0 NLB = 0x400 NLS = 9
639 b(0x8000000000040009),
641 0x40000: # RADIX_SECOND_LEVEL
642 # V = 1 L = 1 SW = 0 RPN = 0
643 # R = 1 C = 1 ATT = 0 EAA 0x7
644 b(0xc000000000000187),
646 0x1000000: # PROCESS_TABLE_3
647 # RTS1 = 0x2 RPDB = 0x300 RTS2 = 0x5 RPDS = 13
648 b(0x40000000000300ad),
652 while True: # wait for dc_valid
655 dc_valid
= yield (dut
.d_out
.valid
)
659 addr
= yield dut
.d_out
.addr
661 print (" DCACHE LOOKUP FAIL %x" % (addr
))
667 yield dut
.d_in
.data
.eq(data
)
668 print (" DCACHE GET %x data %x" % (addr
, data
))
669 yield dut
.d_in
.done
.eq(1)
671 yield dut
.d_in
.done
.eq(0)
675 while not stop
: # wait for dc_valid / err
676 l_done
= yield (dut
.l_out
.done
)
677 l_err
= yield (dut
.l_out
.err
)
678 l_badtree
= yield (dut
.l_out
.badtree
)
679 l_permerr
= yield (dut
.l_out
.perm_error
)
680 l_rc_err
= yield (dut
.l_out
.rc_error
)
681 l_segerr
= yield (dut
.l_out
.segerr
)
682 l_invalid
= yield (dut
.l_out
.invalid
)
683 if (l_done
or l_err
or l_badtree
or
684 l_permerr
or l_rc_err
or l_segerr
or l_invalid
):
687 yield dut
.l_in
.valid
.eq(0) # data already in MMU by now
688 yield dut
.l_in
.mtspr
.eq(0) # captured by RegStage(s)
689 yield dut
.l_in
.load
.eq(0) # can reset everything safely
694 # MMU MTSPR set prtbl
695 yield dut
.l_in
.mtspr
.eq(1)
696 yield dut
.l_in
.sprn
[9].eq(1) # totally fake way to set SPR=prtbl
697 yield dut
.l_in
.rs
.eq(0x1000000) # set process table
698 yield dut
.l_in
.valid
.eq(1)
699 yield from mmu_wait(dut
)
701 yield dut
.l_in
.sprn
.eq(0)
702 yield dut
.l_in
.rs
.eq(0)
705 prtbl
= yield (dut
.rin
.prtbl
)
706 print ("prtbl after MTSPR %x" % prtbl
)
707 assert prtbl
== 0x1000000
709 #yield dut.rin.prtbl.eq(0x1000000) # manually set process table
714 yield dut
.l_in
.load
.eq(1)
715 yield dut
.l_in
.priv
.eq(1)
716 yield dut
.l_in
.addr
.eq(0x10000)
717 yield dut
.l_in
.valid
.eq(1)
718 yield from mmu_wait(dut
)
720 addr
= yield dut
.d_out
.addr
721 pte
= yield dut
.d_out
.pte
722 l_done
= yield (dut
.l_out
.done
)
723 l_err
= yield (dut
.l_out
.err
)
724 l_badtree
= yield (dut
.l_out
.badtree
)
725 print ("translated done %d err %d badtree %d addr %x pte %x" % \
726 (l_done
, l_err
, l_badtree
, addr
, pte
))
728 yield dut
.l_in
.priv
.eq(0)
729 yield dut
.l_in
.addr
.eq(0)
737 vl
= rtlil
.convert(dut
, ports
=[])#dut.ports())
738 with
open("test_mmu.il", "w") as f
:
742 m
.submodules
.mmu
= dut
748 sim
.add_sync_process(wrap(mmu_sim(dut
)))
749 sim
.add_sync_process(wrap(dcache_get(dut
)))
750 with sim
.write_vcd('test_mmu.vcd'):
753 if __name__
== '__main__':