soc.git
2 years agoadd atomic LR/SC signal to LDSTCompUnit
Luke Kenneth Casson Leighton [Sat, 15 Jan 2022 14:06:44 +0000 (14:06 +0000)]
add atomic LR/SC signal to LDSTCompUnit

2 years agoadd reserve (atomic) signal to LDST data structures including PortInterface
Luke Kenneth Casson Leighton [Sat, 15 Jan 2022 14:04:55 +0000 (14:04 +0000)]
add reserve (atomic) signal to LDST data structures including PortInterface

2 years agotidyup PortInterface
Luke Kenneth Casson Leighton [Sat, 15 Jan 2022 14:03:02 +0000 (14:03 +0000)]
tidyup PortInterface

2 years agoworkaround for bug in dcache where the r1.req waiting to be deployed ldst_misalign
Luke Kenneth Casson Leighton [Sat, 15 Jan 2022 12:36:52 +0000 (12:36 +0000)]
workaround for bug in dcache where the r1.req waiting to be deployed
was interfering with the current state being executed
http://lists.libre-soc.org/pipermail/libre-soc-dev/2022-January/004358.html

2 years agoenable both linux-5.7 tests
Luke Kenneth Casson Leighton [Sat, 15 Jan 2022 12:35:12 +0000 (12:35 +0000)]
enable both linux-5.7 tests

2 years agosplit out CacheTag Record to separate structure
Luke Kenneth Casson Leighton [Fri, 14 Jan 2022 14:02:19 +0000 (14:02 +0000)]
split out CacheTag Record to separate structure

2 years agoupdate how d_valid is handled
Luke Kenneth Casson Leighton [Fri, 14 Jan 2022 03:02:39 +0000 (03:02 +0000)]
update how d_valid is handled

2 years agomissed setting r1.store_way and r1.store_row in STORE_WAIT_ACK state
Luke Kenneth Casson Leighton [Fri, 14 Jan 2022 01:42:07 +0000 (01:42 +0000)]
missed setting r1.store_way and r1.store_row in STORE_WAIT_ACK state

2 years agoRevert "dcache 2nd stage (r1) should only indicate not-busy"
Luke Kenneth Casson Leighton [Fri, 14 Jan 2022 01:28:17 +0000 (01:28 +0000)]
Revert "dcache 2nd stage (r1) should only indicate not-busy"

This reverts commit a03aefb1e8ae7d6110a328b57f1336890ebee469.

2 years agosecond test for linux-5.7
Luke Kenneth Casson Leighton [Fri, 14 Jan 2022 01:27:09 +0000 (01:27 +0000)]
second test for linux-5.7

2 years agoadd allow-overlap option to issuer_verilog.py
Luke Kenneth Casson Leighton [Wed, 12 Jan 2022 20:09:03 +0000 (20:09 +0000)]
add allow-overlap option to issuer_verilog.py

2 years agodcache 2nd stage (r1) should only indicate not-busy
Luke Kenneth Casson Leighton [Wed, 12 Jan 2022 12:11:12 +0000 (12:11 +0000)]
dcache 2nd stage (r1) should only indicate not-busy
(r1.full) when all the ACKs of a cache-line fill have been processed
doing this too early results in r0 being pushed into r1 whilst
ACKs are still outstanding, and their completion corrupts the
operation that should not have been put into r1 in the first place

2 years agofix issue with priv_mode not being passed correctly to MMU
Luke Kenneth Casson Leighton [Wed, 12 Jan 2022 11:22:24 +0000 (11:22 +0000)]
fix issue with priv_mode not being passed correctly to MMU
on instruction load

2 years agofix issue with d_valid in dcache, was not being set properly
Luke Kenneth Casson Leighton [Wed, 12 Jan 2022 11:21:40 +0000 (11:21 +0000)]
fix issue with d_valid in dcache, was not being set properly

2 years agoLoadStore1 priv_mode was not being correctly picked up by the MMU
Luke Kenneth Casson Leighton [Mon, 10 Jan 2022 23:03:25 +0000 (23:03 +0000)]
LoadStore1 priv_mode was not being correctly picked up by the MMU
priv_mode needs to come from the original LD/ST request (or the
fetch), which was not happening

2 years agograb the LDST request address for microwatt verilator debug purposes
Luke Kenneth Casson Leighton [Sun, 9 Jan 2022 23:40:34 +0000 (23:40 +0000)]
grab the LDST request address for microwatt verilator debug purposes

2 years agoadd linux-5.7 unit test which showed a silly error:
Luke Kenneth Casson Leighton [Sun, 9 Jan 2022 23:29:10 +0000 (23:29 +0000)]
add linux-5.7 unit test which showed a silly error:
LDST requests through PortInterface were truncated to 48 bits,
where linux uses the top 2 bits of an address for VM/guest (Quadrant 0-3)

2 years agofix MMU lookup after 2nd request (misaligned) by also updating the
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 17:46:56 +0000 (17:46 +0000)]
fix MMU lookup after 2nd request (misaligned) by also updating the
ldst_r with the next address/byte_sel

2 years agoadd microwatt mmu.bin test5 to show page-fault on misaligned LD
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 17:27:42 +0000 (17:27 +0000)]
add microwatt mmu.bin test5 to show page-fault on misaligned LD

2 years agodo not clear out ldst request after TLB entry is added
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 16:49:27 +0000 (16:49 +0000)]
do not clear out ldst request after TLB entry is added

2 years agoenable microwatt mmu test2
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 15:42:58 +0000 (15:42 +0000)]
enable microwatt mmu test2

2 years agowhitespace and use exc is None not exc == None
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 15:41:32 +0000 (15:41 +0000)]
whitespace and use exc is None not exc == None

2 years agoadd a second LD request to dcache which is merged with first,
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 15:26:03 +0000 (15:26 +0000)]
add a second LD request to dcache which is merged with first,
to implement mis-aligned LD operations

2 years agostart adding in mis-aligned LD/ST support into LoadStore1
Luke Kenneth Casson Leighton [Sat, 8 Jan 2022 14:10:16 +0000 (14:10 +0000)]
start adding in mis-aligned LD/ST support into LoadStore1
currently not activated or used so will have no effect

2 years agoadd function test_pi_ld_misalign
Tobias Platen [Sat, 8 Jan 2022 13:30:25 +0000 (14:30 +0100)]
add function test_pi_ld_misalign

2 years agobegin testcase for misalign
Tobias Platen [Fri, 7 Jan 2022 18:07:43 +0000 (19:07 +0100)]
begin testcase for misalign

2 years agowhitespace
Luke Kenneth Casson Leighton [Fri, 7 Jan 2022 16:59:59 +0000 (16:59 +0000)]
whitespace

2 years agoadd missing MSRSpec import
Luke Kenneth Casson Leighton [Fri, 7 Jan 2022 16:57:56 +0000 (16:57 +0000)]
add missing MSRSpec import

2 years agoadd msr_o to issuer in microwatt_compat mode
Luke Kenneth Casson Leighton [Fri, 7 Jan 2022 12:26:45 +0000 (12:26 +0000)]
add msr_o to issuer in microwatt_compat mode

2 years agodouble the number of lines in the L1 D/I-Cache to match microwatt
Luke Kenneth Casson Leighton [Thu, 6 Jan 2022 17:32:46 +0000 (17:32 +0000)]
double the number of lines in the L1 D/I-Cache to match microwatt
early tests halved the number of lines so as to reduce the size of SRAMs
but the issue is that this is mis-matched against the microwatt.dts
device-tree file

2 years agoadd SECOND_REQ state to loadstore.py, not yet implemented
Luke Kenneth Casson Leighton [Thu, 6 Jan 2022 17:31:57 +0000 (17:31 +0000)]
add SECOND_REQ state to loadstore.py, not yet implemented

2 years agoadd easy-to-access debug reporting of instruction and PC
Luke Kenneth Casson Leighton [Wed, 5 Jan 2022 16:32:42 +0000 (16:32 +0000)]
add easy-to-access debug reporting of instruction and PC
for microwatt verilator

2 years agouse microwatt-specific PLRU due to bug in nmutil version
Luke Kenneth Casson Leighton [Wed, 5 Jan 2022 16:31:39 +0000 (16:31 +0000)]
use microwatt-specific PLRU due to bug in nmutil version
(needs investigating)

2 years agofix DriverConflict over MSR write in Issuer/Core by providing an
Luke Kenneth Casson Leighton [Tue, 4 Jan 2022 17:19:47 +0000 (17:19 +0000)]
fix DriverConflict over MSR write in Issuer/Core by providing an
extra write-port to StateRegs

2 years agoremove FetchFSM from TestIssuer (it served its purpose for creating
Luke Kenneth Casson Leighton [Tue, 4 Jan 2022 17:03:48 +0000 (17:03 +0000)]
remove FetchFSM from TestIssuer (it served its purpose for creating
the Inorder version)

2 years agodoh, bus-hack was the wrong way round. *output* the address with
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 23:37:28 +0000 (23:37 +0000)]
doh, bus-hack was the wrong way round. *output* the address with
3 extra LSBs at the front to fix the wishbone incompatibility

2 years agosigh, microwatts wishbone bus usage is non-wishbone-compliant:
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 23:28:13 +0000 (23:28 +0000)]
sigh, microwatts wishbone bus usage is non-wishbone-compliant:
the full address (including LSBs) is dropped onto the bus

2 years agosigh have to allow external clocks and reset mess even in microwatt-compat
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 22:33:39 +0000 (22:33 +0000)]
sigh have to allow external clocks and reset mess even in microwatt-compat
mode.  soc.vhdl still needs to be able to pull an external reset OR
DMI needs to be able to instruct the core to do it. hardly surprising

2 years agogive module appropriate top-level name in microwatt compat mode
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 22:10:17 +0000 (22:10 +0000)]
give module appropriate top-level name in microwatt compat mode

2 years agoadd missing ext_irq signal to testissuer in microwatt compat mode
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 22:09:56 +0000 (22:09 +0000)]
add missing ext_irq signal to testissuer in microwatt compat mode

2 years agoadding an extra option to issuer_verilog.py to be able to cteate a
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 19:55:53 +0000 (19:55 +0000)]
adding an extra option to issuer_verilog.py to be able to cteate a
microwatt-core-compatible verilog file.  it needs to be compatible
with this interface, such that microwatt.v can have TestIssuerInternal
dropped directly in place

module core_512_88be32b2ccc17aa9df4dd9526954b105d7825eba(clk,
rst, alt_reset, \wishbone_insn_in.dat , \wishbone_insn_in.ack ,
\wishbone_insn_in.stall , \wishbone_data_in.dat , \wishbone_data_in.ack ,
\wishbone_data_in.stall , dmi_addr, dmi_din, dmi_req, dmi_wr, ext_irq,
\wishbone_insn_out.adr , \wishbone_insn_out.dat , \wishbone_insn_out.sel ,
\wishbone_insn_out.cyc , \wishbone_insn_out.stb , \wishbone_insn_out.we ,
\wishbone_data_out.adr , \wishbone_data_out.dat , \wishbone_data_out.sel ,
\wishbone_data_out.cyc , \wishbone_data_out.stb , \wishbone_data_out.we ,
dmi_dout, dmi_ack, terminated_out);

2 years agobring external irq out for microwatt-compatible mode in testissuer
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 19:00:46 +0000 (19:00 +0000)]
bring external irq out for microwatt-compatible mode in testissuer

2 years agostop display of LDSTCompUnit debug info on every cycle
Luke Kenneth Casson Leighton [Mon, 3 Jan 2022 14:08:19 +0000 (14:08 +0000)]
stop display of LDSTCompUnit debug info on every cycle

2 years agoOn inorder.py, after Execute, update the PC and go back to Fetch
Cesar Strauss [Mon, 3 Jan 2022 13:02:34 +0000 (10:02 -0300)]
On inorder.py, after Execute, update the PC and go back to Fetch

When removing SVP64 from inorder.py, this code block must have
been deleted by mistake.

"python test_issuer.py nosvp64 --inorder" now completes successfully,
without going into an infinite loop.

2 years agorename nia to cia in MMU input record and mmu FSM
Luke Kenneth Casson Leighton [Thu, 30 Dec 2021 14:24:20 +0000 (14:24 +0000)]
rename nia to cia in MMU input record and mmu FSM
this gets the PC passed over when an instruction fault occurs in
MSR.IR=True mode.

previous tests were only working because the instructions started at 0x0000
and a full cache line was read by I-Cache.  tests greater than a cache
line would have failed

2 years agoAdd an --inorder option to test_issuer.py
Cesar Strauss [Tue, 28 Dec 2021 21:06:02 +0000 (18:06 -0300)]
Add an --inorder option to test_issuer.py

To use, add "--inorder" as the last option, before the test list
It's using the newly added pspec flag (see openpower-isa repo)

2 years agoadd misaligned mmu.bin test 5 notes: currently LoadStore1 does not
Luke Kenneth Casson Leighton [Tue, 28 Dec 2021 02:30:11 +0000 (02:30 +0000)]
add misaligned mmu.bin test 5 notes: currently LoadStore1 does not
support misaligned LD/ST therefore a 0x600 exception is raised
where actually a page-table lookup over the boundary (into a second
PTE which does not exist) should result in a 0x300 (DAR) fault.

also took the opportunity to set align_intr when no-cache is requested
on dcbz

2 years agofound bug in mmu with calculating addrsh, should have been a right
Luke Kenneth Casson Leighton [Mon, 27 Dec 2021 18:52:05 +0000 (18:52 +0000)]
found bug in mmu with calculating addrsh, should have been a right
shift

2 years agoadd mmu.py microwatt mmu.bin test4 page table
Luke Kenneth Casson Leighton [Mon, 27 Dec 2021 18:51:28 +0000 (18:51 +0000)]
add mmu.py microwatt mmu.bin test4 page table
and add some debug / clarity for signal names in mmu.py
looking for addrsh bug

2 years agoFix indentation
Cesar Strauss [Mon, 27 Dec 2021 13:26:45 +0000 (10:26 -0300)]
Fix indentation

2 years agogood grief, finally tracked down a piece of missing code in the MMU
Luke Kenneth Casson Leighton [Sun, 26 Dec 2021 18:52:29 +0000 (18:52 +0000)]
good grief, finally tracked down a piece of missing code in the MMU
address-shift had somehow not been included
@@ -509,6 +523,10 @@ class MMU(Elaboratable):
         comb += tlb_mask.shift.eq(r.shift)
         comb += finalmask.eq(tlb_mask.mask)

+        # Shift address bits 61--12 right by 0--47 bits and
+        # supply the least significant 16 bits of the result.
+        comb += addrsh.eq(r.addr[12:62] << r.shift)
+

microwatt mmu.bin test 2 should now succeed

2 years agowhoops, using variable RegStage0 in dcache stage_0, should not use sync
Luke Kenneth Casson Leighton [Sun, 26 Dec 2021 00:43:31 +0000 (00:43 +0000)]
whoops, using variable RegStage0 in dcache stage_0, should not use sync

2 years agomissed reset of d_valid in dcache.py and missed that its
Luke Kenneth Casson Leighton [Sun, 26 Dec 2021 00:16:53 +0000 (00:16 +0000)]
missed reset of d_valid in dcache.py and missed that its
input is sync not comb

2 years agorename addr to raddr in LoadStore1 to avoid conflict with
Luke Kenneth Casson Leighton [Sun, 26 Dec 2021 00:15:35 +0000 (00:15 +0000)]
rename addr to raddr in LoadStore1 to avoid conflict with
PortInterfaceBase

2 years agoadd mmu.bin test2 to much simpler test_loadstore1.py
Luke Kenneth Casson Leighton [Sat, 25 Dec 2021 15:49:25 +0000 (15:49 +0000)]
add mmu.bin test2 to much simpler test_loadstore1.py
this eliminates TestIssuer (and the MMU FSM-based FU) from enquiries
into a VM lookup bug where virtual address is being treated as the real

2 years agomove msr in test_loadstore1.py outside of conditional block
Luke Kenneth Casson Leighton [Sat, 25 Dec 2021 15:42:04 +0000 (15:42 +0000)]
move msr in test_loadstore1.py outside of conditional block

2 years agowhitespace
Luke Kenneth Casson Leighton [Sat, 25 Dec 2021 15:32:59 +0000 (15:32 +0000)]
whitespace

2 years agomove microwatt mmu.bin test 3 page table to test pagetables module
Luke Kenneth Casson Leighton [Sat, 25 Dec 2021 15:27:20 +0000 (15:27 +0000)]
move microwatt mmu.bin test 3 page table to test pagetables module

2 years agowait for MMU "done" when setting PRTBL and PIDR
Luke Kenneth Casson Leighton [Sat, 25 Dec 2021 07:24:11 +0000 (07:24 +0000)]
wait for MMU "done" when setting PRTBL and PIDR

2 years agoadd microwatt mmu.bin regression test test_mmu_3
Luke Kenneth Casson Leighton [Sat, 25 Dec 2021 06:57:15 +0000 (06:57 +0000)]
add microwatt mmu.bin regression test test_mmu_3

2 years agoenable instruction redirect in mmu ifetch test
Luke Kenneth Casson Leighton [Fri, 24 Dec 2021 13:49:19 +0000 (13:49 +0000)]
enable instruction redirect in mmu ifetch test

2 years agosomehow managed to miss out setting r1.forward_valid1 in dcache
Luke Kenneth Casson Leighton [Thu, 23 Dec 2021 20:04:54 +0000 (20:04 +0000)]
somehow managed to miss out setting r1.forward_valid1 in dcache

2 years agouniquify names in dcache.py
Luke Kenneth Casson Leighton [Thu, 23 Dec 2021 19:47:39 +0000 (19:47 +0000)]
uniquify names in dcache.py

2 years agoallow MSR reset to default to a value set by issuer_verilog.py
Luke Kenneth Casson Leighton [Thu, 23 Dec 2021 17:05:53 +0000 (17:05 +0000)]
allow MSR reset to default to a value set by issuer_verilog.py

2 years agopass in msr_reset to issuer_verilog.py
Luke Kenneth Casson Leighton [Thu, 23 Dec 2021 16:57:59 +0000 (16:57 +0000)]
pass in msr_reset to issuer_verilog.py

2 years agoadd ability to set the reset values of RegFileArray
Luke Kenneth Casson Leighton [Thu, 23 Dec 2021 16:56:21 +0000 (16:56 +0000)]
add ability to set the reset values of RegFileArray

2 years agoRemove extra wait on core_stop_o at end of Execute.
Cesar Strauss [Thu, 23 Dec 2021 11:45:25 +0000 (08:45 -0300)]
Remove extra wait on core_stop_o at end of Execute.

Fixes https://bugs.libre-soc.org/show_bug.cgi?id=726
Now, there is only one wait, before Fetch.
It fixes DMI single-stepping for Power ISA 3.0B instructions, but
single-stepping in the middle of a SVP64 VL loop no longer works,
for now.

2 years agoRe-enable core stopped signal when stopped.
Cesar Strauss [Thu, 23 Dec 2021 10:56:42 +0000 (07:56 -0300)]
Re-enable core stopped signal when stopped.

2 years agoonly use a single variable for ack adjusting in dcache.py
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 23:21:50 +0000 (23:21 +0000)]
only use a single variable for ack adjusting in dcache.py
STORE_WAIT_ACK state

2 years agofix issues with running core in DMI "stopped" status when
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 23:20:14 +0000 (23:20 +0000)]
fix issues with running core in DMI "stopped" status when
issuing a single-step

2 years agowhen setting DSISR in LoadStore1 use correct load bit (from register)
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 03:53:45 +0000 (03:53 +0000)]
when setting DSISR in LoadStore1 use correct load bit (from register)

2 years agouse correct X-Form L field in OP_MTMSRD
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 03:53:13 +0000 (03:53 +0000)]
use correct X-Form L field in OP_MTMSRD

2 years agocheck problem state in OP_MTMSRD from original reg RA rather than
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 03:24:44 +0000 (03:24 +0000)]
check problem state in OP_MTMSRD from original reg RA rather than
after the fact

2 years agowhoops, use MSR.IR for I-Cache fetch!
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 02:44:57 +0000 (02:44 +0000)]
whoops, use MSR.IR for I-Cache fetch!
virtual memory instruction fetch uses MSR.IR not MSR.DR

2 years agoremove unneeded state in LoadStore1
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 01:47:38 +0000 (01:47 +0000)]
remove unneeded state in LoadStore1

2 years agoclear instruction fault on exception WAIT_MMU ACK in LoadStore1
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:49:07 +0000 (00:49 +0000)]
clear instruction fault on exception WAIT_MMU ACK in LoadStore1

2 years agoclear out instr_fault when exception is thrown
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:42:16 +0000 (00:42 +0000)]
clear out instr_fault when exception is thrown

2 years agoclear instruction fault on idle/valid in Loadstore1
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:39:30 +0000 (00:39 +0000)]
clear instruction fault on idle/valid in Loadstore1

2 years agoooo far too late at night to be doing this
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:19:54 +0000 (00:19 +0000)]
ooo far too late at night to be doing this

2 years agowhoops use C not Const
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:18:39 +0000 (00:18 +0000)]
whoops use C not Const

2 years agowhoops use C not Const
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:15:26 +0000 (00:15 +0000)]
whoops use C not Const

2 years agoremove bus_ack (found bug in Simulation, sorted)
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:15:07 +0000 (00:15 +0000)]
remove bus_ack (found bug in Simulation, sorted)

2 years agobug in mmu setting radix tree size with one extra bit
Luke Kenneth Casson Leighton [Wed, 22 Dec 2021 00:03:33 +0000 (00:03 +0000)]
bug in mmu setting radix tree size with one extra bit
rts does not include bit 63 (MSB0 bit 0)

2 years agocontinue to assert PC in FetchFSM if needed
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 23:50:47 +0000 (23:50 +0000)]
continue to assert PC in FetchFSM if needed

2 years agoenable I-Cache wishbone memory type in issuer_verilog.py if MMU requested
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 16:32:55 +0000 (16:32 +0000)]
enable I-Cache wishbone memory type in issuer_verilog.py if MMU requested

2 years agowhoops issuer_verilog.py enabling mmu has to pass microwatt_mmu
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 15:57:37 +0000 (15:57 +0000)]
whoops issuer_verilog.py enabling mmu has to pass microwatt_mmu
option to TestMemPSpec

2 years agofor each unit test case in test_issuer_mmu_data_path.py initialise memory
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 15:47:39 +0000 (15:47 +0000)]
for each unit test case in test_issuer_mmu_data_path.py initialise memory
to empty

2 years agotest_issuer_mmu_data_path.py needs to use wb_get because of
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 14:21:06 +0000 (14:21 +0000)]
test_issuer_mmu_data_path.py needs to use wb_get because of
reading from i-cache cannot be done without it

2 years agommu code-comments
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 12:51:45 +0000 (12:51 +0000)]
mmu code-comments

2 years agocomments
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 05:07:37 +0000 (05:07 +0000)]
comments

2 years agouse prtbl in proc_tbl_wait in mmu
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 04:59:48 +0000 (04:59 +0000)]
use prtbl in proc_tbl_wait in mmu

2 years agommu.py comments
Luke Kenneth Casson Leighton [Tue, 21 Dec 2021 04:53:45 +0000 (04:53 +0000)]
mmu.py comments

2 years agoset up DAR correctly in unit tests, added set_ldst_spr() which toggles
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 23:10:09 +0000 (23:10 +0000)]
set up DAR correctly in unit tests, added set_ldst_spr() which toggles
LoadStore1 input flags in order to store DAR in the unit itself

2 years agounit tests for SPRs when MMU enabled,
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 19:07:44 +0000 (19:07 +0000)]
unit tests for SPRs when MMU enabled,
start setting DAR, DSISR, PIDR, PRTBL etc

2 years agomore code-comments
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 15:11:46 +0000 (15:11 +0000)]
more code-comments

2 years agocode-comments in MMU
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 15:08:20 +0000 (15:08 +0000)]
code-comments in MMU

2 years agoprefer not to invert when doing if/else.
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 15:01:38 +0000 (15:01 +0000)]
prefer not to invert when doing if/else.

2 years agomore code-comments
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 13:42:09 +0000 (13:42 +0000)]
more code-comments

2 years agoadd RTPDE - Radit Tree Page Directory Entry - Record and use it in MMU
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 13:38:44 +0000 (13:38 +0000)]
add RTPDE - Radit Tree Page Directory Entry - Record and use it in MMU
RTPDE is different from RTPTE

2 years agoadd (and ues) PRTBL Record in MMU
Luke Kenneth Casson Leighton [Mon, 20 Dec 2021 13:14:12 +0000 (13:14 +0000)]
add (and ues) PRTBL Record in MMU
PRTBL: Page Table Record.  it is identical in format and naming PGTBL