Bug 427 - LDST cache-inhibit instructions needed (l*cix, st*cix)
Summary: LDST cache-inhibit instructions needed (l*cix, st*cix)
Alias: None
Product: Libre-SOC's first SoC
Classification: Unclassified
Component: Source Code (show other bugs)
Version: unspecified
Hardware: PC Linux
: --- enhancement
Assignee: Luke Kenneth Casson Leighton
Depends on:
Blocks: 383
  Show dependency treegraph
Reported: 2020-07-12 12:38 BST by Luke Kenneth Casson Leighton
Modified: 2021-11-29 21:41 GMT (History)
1 user (show)

See Also:
NLnet milestone: NLNet.2019.10.043.Wishbone
total budget (EUR) for completion of task and all subtasks: 200
budget (EUR) for this task, excluding subtasks' budget: 200
parent task for budget allocation: 383
child tasks for budget allocation:
The table of payments (in EUR) for this task; TOML format:
lkcl = { amount = 200, submitted = 2021-04-24, paid = 2021-05-01 }


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Description Luke Kenneth Casson Leighton 2020-07-12 12:38:49 BST
cache-inhibit variants of LDST instructions are needed.

* lbzcix RT,RA,RB
* lhzcix RT,RA,RB
* lwzcix RT,RA,RB
* ldcix RT,RA,RB
* stbcix RS,RA,RB
* sthcix RS,RA,RB
* stwcix RS,RA,RB
* stdcix RS,RA,RB

these to have a flag indicating cache-bypass     done not tested

pseudo-code to be added to wiki isa              DONE not tested

opcodes to be added to major_31.csv              DONE not tested

unit tests                                       not done

pass cache-bypass flag through to PortInterface  not done
Comment 1 Luke Kenneth Casson Leighton 2020-09-06 09:50:54 BST
commit e29393d63fea62ea2a2d7de9307fea2d36e36497
Author: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date:   Sat Sep 5 16:38:40 2020 +0100

    add lwzcix unit test

commit 0d42b8c306f2caeaf7599cdb1a219929eb4e0b53
Author: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date:   Sat Sep 5 17:10:26 2020 +0100

    use stbcix in test

wrong major_31 opcode for lbzcix in the CSV files