-# SPDX-License-Identifier: LGPLv3+
-# Copyright (C) 2020, 2021 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
-# Copyright (C) 2021 Tobias Platen
-# Funded by NLnet http://nlnet.nl
-"""core of the python-based POWER9 simulator
+# moved to openpower-isa
+# https://git.libre-soc.org/?p=openpower-isa.git;a=summary
+# wildcard imports here ONLY to support migration
-this is part of a cycle-accurate POWER9 simulator. its primary purpose is
-not speed, it is for both learning and educational purposes, as well as
-a method of verifying the HDL.
-
-related bugs:
-
-* https://bugs.libre-soc.org/show_bug.cgi?id=604
-"""
-
-from nmigen.back.pysim import Settle
-from copy import copy
-from soc.decoder.selectable_int import (FieldSelectableInt, SelectableInt,
- selectconcat)
-from soc.decoder.helpers import exts, gtu, ltu, undefined
-from soc.decoder.isa.mem import Mem
-
-import math
-import sys
-
-# very quick, TODO move to SelectableInt utils later
-def genmask(shift, size):
- res = SelectableInt(0, size)
- for i in range(size):
- if i < shift:
- res[size-1-i] = SelectableInt(1, 1)
- return res
-
-"""
- Get Root Page
-
- //Accessing 2nd double word of partition table (pate1)
- //Ref: Power ISA Manual v3.0B, Book-III, section 5.7.6.1
- // PTCR Layout
- // ====================================================
- // -----------------------------------------------
- // | /// | PATB | /// | PATS |
- // -----------------------------------------------
- // 0 4 51 52 58 59 63
- // PATB[4:51] holds the base address of the Partition Table,
- // right shifted by 12 bits.
- // This is because the address of the Partition base is
- // 4k aligned. Hence, the lower 12bits, which are always
- // 0 are ommitted from the PTCR.
- //
- // Thus, The Partition Table Base is obtained by (PATB << 12)
- //
- // PATS represents the partition table size right-shifted by 12 bits.
- // The minimal size of the partition table is 4k.
- // Thus partition table size = (1 << PATS + 12).
- //
- // Partition Table
- // ====================================================
- // 0 PATE0 63 PATE1 127
- // |----------------------|----------------------|
- // | | |
- // |----------------------|----------------------|
- // | | |
- // |----------------------|----------------------|
- // | | | <-- effLPID
- // |----------------------|----------------------|
- // .
- // .
- // .
- // |----------------------|----------------------|
- // | | |
- // |----------------------|----------------------|
- //
- // The effective LPID forms the index into the Partition Table.
- //
- // Each entry in the partition table contains 2 double words, PATE0, PATE1,
- // corresponding to that partition.
- //
- // In case of Radix, The structure of PATE0 and PATE1 is as follows.
- //
- // PATE0 Layout
- // -----------------------------------------------
- // |1|RTS1|/| RPDB | RTS2 | RPDS |
- // -----------------------------------------------
- // 0 1 2 3 4 55 56 58 59 63
- //
- // HR[0] : For Radix Page table, first bit should be 1.
- // RTS1[1:2] : Gives one fragment of the Radix treesize
- // RTS2[56:58] : Gives the second fragment of the Radix Tree size.
- // RTS = (RTS1 << 3 + RTS2) + 31.
- //
- // RPDB[4:55] = Root Page Directory Base.
- // RPDS = Logarithm of Root Page Directory Size right shifted by 3.
- // Thus, Root page directory size = 1 << (RPDS + 3).
- // Note: RPDS >= 5.
- //
- // PATE1 Layout
- // -----------------------------------------------
- // |///| PRTB | // | PRTS |
- // -----------------------------------------------
- // 0 3 4 51 52 58 59 63
- //
- // PRTB[4:51] = Process Table Base. This is aligned to size.
- // PRTS[59: 63] = Process Table Size right shifted by 12.
- // Minimal size of the process table is 4k.
- // Process Table Size = (1 << PRTS + 12).
- // Note: PRTS <= 24.
- //
- // Computing the size aligned Process Table Base:
- // table_base = (PRTB & ~((1 << PRTS) - 1)) << 12
- // Thus, the lower 12+PRTS bits of table_base will
- // be zero.
-
-
- //Ref: Power ISA Manual v3.0B, Book-III, section 5.7.6.2
- //
- // Process Table
- // ==========================
- // 0 PRTE0 63 PRTE1 127
- // |----------------------|----------------------|
- // | | |
- // |----------------------|----------------------|
- // | | |
- // |----------------------|----------------------|
- // | | | <-- effPID
- // |----------------------|----------------------|
- // .
- // .
- // .
- // |----------------------|----------------------|
- // | | |
- // |----------------------|----------------------|
- //
- // The effective Process id (PID) forms the index into the Process Table.
- //
- // Each entry in the partition table contains 2 double words, PRTE0, PRTE1,
- // corresponding to that process
- //
- // In case of Radix, The structure of PRTE0 and PRTE1 is as follows.
- //
- // PRTE0 Layout
- // -----------------------------------------------
- // |/|RTS1|/| RPDB | RTS2 | RPDS |
- // -----------------------------------------------
- // 0 1 2 3 4 55 56 58 59 63
- //
- // RTS1[1:2] : Gives one fragment of the Radix treesize
- // RTS2[56:58] : Gives the second fragment of the Radix Tree size.
- // RTS = (RTS1 << 3 + RTS2) << 31,
- // since minimal Radix Tree size is 4G.
- //
- // RPDB = Root Page Directory Base.
- // RPDS = Root Page Directory Size right shifted by 3.
- // Thus, Root page directory size = RPDS << 3.
- // Note: RPDS >= 5.
- //
- // PRTE1 Layout
- // -----------------------------------------------
- // | /// |
- // -----------------------------------------------
- // 0 63
- // All bits are reserved.
-
-
-"""
-
-# see qemu/target/ppc/mmu-radix64.c for reference
-class RADIX:
- def __init__(self, mem, caller):
- self.mem = mem
- self.caller = caller
- #TODO move to lookup
- self.dsisr = self.caller.spr["DSISR"]
- self.dar = self.caller.spr["DAR"]
- self.pidr = self.caller.spr["PIDR"]
- self.prtbl = self.caller.spr["PRTBL"]
-
- # cached page table stuff
- self.pgtbl0 = 0
- self.pt0_valid = False
- self.pgtbl3 = 0
- self.pt3_valid = False
-
- def __call__(self, addr, sz):
- val = self.ld(addr.value, sz, swap=False)
- print("RADIX memread", addr, sz, val)
- return SelectableInt(val, sz*8)
-
- def ld(self, address, width=8, swap=True, check_in_mem=False):
- print("RADIX: ld from addr 0x%x width %d" % (address, width))
-
- mode = 'LOAD' # XXX TODO: executable load (icache)
- addr = SelectableInt(address, 64)
- (shift, mbits, pgbase) = self._decode_prte(addr)
- #shift = SelectableInt(0, 32)
-
- pte = self._walk_tree(addr, pgbase, mode, mbits, shift)
- # use pte to caclculate phys address
- return self.mem.ld(address, width, swap, check_in_mem)
-
- # XXX set SPRs on error
-
- # TODO implement
- def st(self, address, v, width=8, swap=True):
- print("RADIX: st to addr 0x%x width %d data %x" % (address, width, v))
-
- mode = 'STORE'
- addr = SelectableInt(address, 64)
- (shift, mbits, pgbase) = self._decode_prte(addr)
- pte = self._walk_tree(addr, pgbase, mode, mbits, shift)
-
- # use pte to caclculate phys address (addr)
- return self.mem.st(addr.value, v, width, swap)
-
- # XXX set SPRs on error
-
- def memassign(self, addr, sz, val):
- print("memassign", addr, sz, val)
- self.st(addr.value, val.value, sz, swap=False)
-
- def _next_level(self):
- return True
- ## DSISR_R_BADCONFIG
- ## read_entry
- ## DSISR_NOPTE
- ## Prepare for next iteration
-
- def _walk_tree(self, addr, pgbase, mode, mbits, shift):
- """walk tree
-
- // vaddr 64 Bit
- // vaddr |-----------------------------------------------------|
- // | Unused | Used |
- // |-----------|-----------------------------------------|
- // | 0000000 | usefulBits = X bits (typically 52) |
- // |-----------|-----------------------------------------|
- // | |<--Cursize---->| |
- // | | Index | |
- // | | into Page | |
- // | | Directory | |
- // |-----------------------------------------------------|
- // | |
- // V |
- // PDE |---------------------------| |
- // |V|L|//| NLB |///|NLS| |
- // |---------------------------| |
- // PDE = Page Directory Entry |
- // [0] = V = Valid Bit |
- // [1] = L = Leaf bit. If 0, then |
- // [4:55] = NLB = Next Level Base |
- // right shifted by 8 |
- // [59:63] = NLS = Next Level Size |
- // | NLS >= 5 |
- // | V
- // | |--------------------------|
- // | | usfulBits = X-Cursize |
- // | |--------------------------|
- // |---------------------><--NLS-->| |
- // | Index | |
- // | into | |
- // | PDE | |
- // |--------------------------|
- // |
- // If the next PDE obtained by |
- // (NLB << 8 + 8 * index) is a |
- // nonleaf, then repeat the above. |
- // |
- // If the next PDE is a leaf, |
- // then Leaf PDE structure is as |
- // follows |
- // |
- // |
- // Leaf PDE |
- // |------------------------------| |----------------|
- // |V|L|sw|//|RPN|sw|R|C|/|ATT|EAA| | usefulBits |
- // |------------------------------| |----------------|
- // [0] = V = Valid Bit |
- // [1] = L = Leaf Bit = 1 if leaf |
- // PDE |
- // [2] = Sw = Sw bit 0. |
- // [7:51] = RPN = Real Page Number, V
- // real_page = RPN << 12 -------------> Logical OR
- // [52:54] = Sw Bits 1:3 |
- // [55] = R = Reference |
- // [56] = C = Change V
- // [58:59] = Att = Physical Address
- // 0b00 = Normal Memory
- // 0b01 = SAO
- // 0b10 = Non Idenmpotent
- // 0b11 = Tolerant I/O
- // [60:63] = Encoded Access
- // Authority
- //
- """
- # get sprs
- print("_walk_tree")
- pidr = self.caller.spr["PIDR"]
- prtbl = self.caller.spr["PRTBL"]
- print(pidr)
- print(prtbl)
-
- # get address of root entry
- prtable_addr = self._get_prtable_addr(shift, prtbl, addr, pidr)
- print("prtable_addr",prtable_addr)
-
- # read root entry - imcomplete
- swap = False
- check_in_mem = False
- entry_width = 8
- value = self.mem.ld(prtable_addr.value, entry_width, swap, check_in_mem)
- print("value",value)
-
-
- # walk tree starts on prtbl
- while True:
- ret = self._next_level()
- if ret: return ret
- # TODO fix AttributeError: 'RADIX' object has no attribute 'pid'
-
- def _decode_prte(self, data):
- """PRTE0 Layout
- -----------------------------------------------
- |/|RTS1|/| RPDB | RTS2 | RPDS |
- -----------------------------------------------
- 0 1 2 3 4 55 56 58 59 63
- """
- # note that SelectableInt does big-endian! so the indices
- # below *directly* match the spec, unlike microwatt which
- # has to turn them around (to LE)
- zero = SelectableInt(0, 1)
- rts = selectconcat(zero,
- data[56:59], # RTS2
- data[1:3], # RTS1
- )
- masksize = data[59:64] # RPDS
- mbits = selectconcat(zero, masksize)
- pgbase = selectconcat(data[8:56], # part of RPDB
- SelectableInt(0, 16),)
-
- return (rts, mbits, pgbase)
-
- def _segment_check(self, addr, mbits, shift):
- """checks segment valid
- mbits := '0' & r.mask_size;
- v.shift := r.shift + (31 - 12) - mbits;
- nonzero := or(r.addr(61 downto 31) and not finalmask(30 downto 0));
- if r.addr(63) /= r.addr(62) or nonzero = '1' then
- v.state := RADIX_FINISH;
- v.segerror := '1';
- elsif mbits < 5 or mbits > 16 or mbits > (r.shift + (31 - 12)) then
- v.state := RADIX_FINISH;
- v.badtree := '1';
- else
- v.state := RADIX_LOOKUP;
- """
- # note that SelectableInt does big-endian! so the indices
- # below *directly* match the spec, unlike microwatt which
- # has to turn them around (to LE)
- mask = genmask(shift, 44)
- nonzero = addr[1:32] & mask[13:44] # mask 31 LSBs (BE numbered 13:44)
- print ("RADIX _segment_check nonzero", bin(nonzero.value))
- print ("RADIX _segment_check addr[0-1]", addr[0].value, addr[1].value)
- if addr[0] != addr[1] or nonzero == 1:
- return "segerror"
- limit = shift + (31 - 12)
- if mbits < 5 or mbits > 16 or mbits > limit:
- return "badtree"
- new_shift = shift + (31 - 12) - mbits
- return new_shift
-
- def _check_perms(self, data, priv, iside, store):
- """check page permissions
- // Leaf PDE |
- // |------------------------------| |----------------|
- // |V|L|sw|//|RPN|sw|R|C|/|ATT|EAA| | usefulBits |
- // |------------------------------| |----------------|
- // [0] = V = Valid Bit |
- // [1] = L = Leaf Bit = 1 if leaf |
- // PDE |
- // [2] = Sw = Sw bit 0. |
- // [7:51] = RPN = Real Page Number, V
- // real_page = RPN << 12 -------------> Logical OR
- // [52:54] = Sw Bits 1:3 |
- // [55] = R = Reference |
- // [56] = C = Change V
- // [58:59] = Att = Physical Address
- // 0b00 = Normal Memory
- // 0b01 = SAO
- // 0b10 = Non Idenmpotent
- // 0b11 = Tolerant I/O
- // [60:63] = Encoded Access
- // Authority
- //
- -- test leaf bit
- -- check permissions and RC bits
- perm_ok := '0';
- if r.priv = '1' or data(3) = '0' then
- if r.iside = '0' then
- perm_ok := data(1) or (data(2) and not r.store);
- else
- -- no IAMR, so no KUEP support for now
- -- deny execute permission if cache inhibited
- perm_ok := data(0) and not data(5);
- end if;
- end if;
- rc_ok := data(8) and (data(7) or not r.store);
- if perm_ok = '1' and rc_ok = '1' then
- v.state := RADIX_LOAD_TLB;
- else
- v.state := RADIX_FINISH;
- v.perm_err := not perm_ok;
- -- permission error takes precedence over RC error
- v.rc_error := perm_ok;
- end if;
- """
- # check permissions and RC bits
- perm_ok = 0
- if priv == 1 or data[60] == 0:
- if iside == 0:
- perm_ok = data[62] | (data[61] & (store == 0))
- # no IAMR, so no KUEP support for now
- # deny execute permission if cache inhibited
- perm_ok = data[63] & ~data[58]
- rc_ok = data[55] & (data[56] | (store == 0))
- if perm_ok == 1 and rc_ok == 1:
- return True
- return "perm_err" if perm_ok == 0 else "rc_err"
-
- def _get_prtable_addr(self, shift, prtbl, addr, pid):
- """
- if r.addr(63) = '1' then
- effpid := x"00000000";
- else
- effpid := r.pid;
- end if;
- x"00" & r.prtbl(55 downto 36) &
- ((r.prtbl(35 downto 12) and not finalmask(23 downto 0)) or
- (effpid(31 downto 8) and finalmask(23 downto 0))) &
- effpid(7 downto 0) & "0000";
- """
- print ("_get_prtable_addr_", shift, prtbl, addr, pid)
- finalmask = genmask(shift, 44)
- finalmask24 = finalmask[20:44]
- if addr[0].value == 1:
- effpid = SelectableInt(0, 32)
- else:
- effpid = pid #self.pid # TODO, check on this
- zero16 = SelectableInt(0, 16)
- zero4 = SelectableInt(0, 4)
- res = selectconcat(zero16,
- prtbl[8:28], #
- (prtbl[28:52] & ~finalmask24) | #
- (effpid[0:24] & finalmask24), #
- effpid[24:32],
- zero4
- )
- return res
-
- def _get_pgtable_addr(self, mask_size, pgbase, addrsh):
- """
- x"00" & r.pgbase(55 downto 19) &
- ((r.pgbase(18 downto 3) and not mask) or (addrsh and mask)) &
- "000";
- """
- mask16 = genmask(mask_size+5, 16)
- zero8 = SelectableInt(0, 8)
- zero3 = SelectableInt(0, 3)
- res = selectconcat(zero8,
- pgbase[8:45], #
- (prtbl[45:61] & ~mask16) | #
- (addrsh & mask16), #
- zero3
- )
- return res
-
- def _get_pte(self, shift, addr, pde):
- """
- x"00" &
- ((r.pde(55 downto 12) and not finalmask) or
- (r.addr(55 downto 12) and finalmask))
- & r.pde(11 downto 0);
- """
- finalmask = genmask(shift, 44)
- zero8 = SelectableInt(0, 8)
- res = selectconcat(zero8,
- (pde[8:52] & ~finalmask) | #
- (addr[8:52] & finalmask), #
- pde[52:64],
- )
- return res
-
-
-# very quick test of maskgen function (TODO, move to util later)
-if __name__ == '__main__':
- # set up dummy minimal ISACaller
- spr = {'DSISR': SelectableInt(0, 64),
- 'DAR': SelectableInt(0, 64),
- 'PIDR': SelectableInt(0, 64),
- 'PRTBL': SelectableInt(0, 64)
- }
- class ISACaller: pass
- caller = ISACaller()
- caller.spr = spr
-
- shift = SelectableInt(5, 6)
- mask = genmask(shift, 43)
- print (" mask", bin(mask.value))
-
- mem = Mem(row_bytes=8)
- mem = RADIX(mem, caller)
- # -----------------------------------------------
- # |/|RTS1|/| RPDB | RTS2 | RPDS |
- # -----------------------------------------------
- # |0|1 2|3|4 55|56 58|59 63|
- data = SelectableInt(0, 64)
- data[1:3] = 0b01
- data[56:59] = 0b11
- data[59:64] = 0b01101 # mask
- data[55] = 1
- (rts, mbits, pgbase) = mem._decode_prte(data)
- print (" rts", bin(rts.value), rts.bits)
- print (" mbits", bin(mbits.value), mbits.bits)
- print (" pgbase", hex(pgbase.value), pgbase.bits)
- addr = SelectableInt(0x1000, 64)
- check = mem._segment_check(addr, mbits, shift)
- print (" segment check", check)
-
- print("walking tree")
- # addr = unchanged
- # pgbase = None
- mode = None
- #mbits = None
- shift = rts
- result = mem._walk_tree(addr, pgbase, mode, mbits, shift)
- print(result)
+from openpower.decoder.isa.radixmmu import *
projects / soc.git / blobdiff