[dv,formal,nix] Use Nix to setup formal development and test environment

Adds a Nix environment which provides a development shell for the formal verification flow. All dependencies are fetched and built upon entering the shell (nix develop .#formal), except for the proprietary Cadence Jasper. The dev shell (nix develop .#formal-dev) is identical to the normal shell, but prints some information on how to swap out components. This is also documented in the README. Documentation on how to use this environment is added to the dv/formal/README.md The provided Makefile/.tcl scripts make assumptions about the environment they are run within which are provided by the Nix environment. Using Nix is the recommended way to run this flow, but if you cannot do this, you will need to duplicate the setup done by Nix in terms of environment variables and provided dependencies. Jasper Gold options: - allow_unsupported_OS is required on both the machines I use. - acquire_proj means that if JG is killed (which happens somewhat often) the next it runs it will still be able to take ownership of the project. Co-authored-by: Louis-Emile Ploix <louis-emile.ploix@lowrisc.org> Co-authored-by: Marno van der Maas <mvdmaas+git@lowrisc.org> Co-authored-by: Gary Guo <gary.guo@lowrisc.org> Signed-off-by: Harry Callahan <hcallahan@lowrisc.org>
2025-06-27 17:00:41 -04:00 · 2024-08-06 22:57:43 +01:00 · 2024-08-06 22:57:43 +01:00 · cea3d04caf
commit cea3d04caf
parent 293b4bccac
8 changed files with 1193 additions and 10 deletions
--- a/dv/formal/Makefile
+++ b/dv/formal/Makefile
@ -2,7 +2,7 @@ IBEX_ROOT=../..

 SAIL=sail

-SAIL_RISCV_MODEL_DIR=../sail-riscv/model
+SAIL_RISCV_MODEL_DIR=${LOWRISC_SAIL_RISCV_SRC}/model

 include Sources.mk

@ -48,3 +48,20 @@ sv:
 psgen:
 	mkdir -p build
 	psgen $(addprefix -path ,$(PSGEN_SRCS)) $(PSGEN_FLAGS) -sv-out build/psgen.sv -tcl-out build/psgen.tcl
+
+.PHONY: jg
+jg: fusesoc psgen sv
+	jg verify.tcl -allow_unsupported_OS -acquire_proj
+
+# The following default target is intended for regressions / unattended runs.
+.PHONY: all
+all: fusesoc psgen sv
+	jg verify.tcl -allow_unsupported_OS -acquire_proj -no_gui --- "prove_no_liveness"
+
+################################################################################
+
+.PHONY: clean
+clean:
+	rm -rf build/
+	rm -rf jgproject/
+	rm -rf jgproofs/
--- a/dv/formal/README.md
+++ b/dv/formal/README.md
@ -1,16 +1,71 @@
-# End to End Formal Verification against the Sail
+# End-to-End Formal Verification of Ibex Trace Equivalence against the Sail Model

-Prerequisities (in your PATH):
- [The lowRISC fork of the Sail compiler](https://github.com/lowRISC/sail/tree/lowrisc)
- [psgen](https://github.com/mndstrmr/psgen)
+## Building & Running the flow
+
+Prerequisites:
+- Nix (`https://zero-to-nix.com/start/install`)
+- Cadence Jasper
+  If Jasper is not found on you PATH, `nix develop` will refuse to enter the development shell.
+
+Getting started:
+- Clone this repository
+- `cd dv/formal`
+
+### Reproducible Build
+
+This flow is intended for users who wish to run the formal flow as-is using the pinned external dependencies (psgen, sail, riscv-sail etc.)

 Build instructions:
- `make fusesoc` fetches the necessary RTL using the Fusesoc tool, and makes a local copy inside `build/`. This also creates a filelist (`.scr`) that Jasper knows how to ingest.
-  - This step also patches the Ibex RTL with the changes described [in the section below](#rtl-changes).
+- `nix develop .#formal`
+- `make` invokes Jasper in batch-mode, and attempts to prove everything, which is meant for regressions.
+- `make jg` invokes Jasper interactively, halting after sourcing the contents of `verify.tcl`.
+
+After `make jg`, Jasper should start up and should execute the commands in the TCL file.
+You can see the different steps of the proof in the `Task Tree` tab.
+Then, you can prove each step in order by right clicking on them and clicking `Prove Task`.
+Some tasks may take longer than others and you can select specific properties in the `Property Table` and prove them individually by right clicking and selecting `Prove Property`.
+Some steps require a lot of RAM and CPU so we recommend closing any other resource-heavy programs running on your computer.
+A machine with 128 GiB of RAM and 32 cores was used to complete the proof.
+To avoid manually running each step you can also use the `prove_lemmas` command inside the TCL command interface located below your session window.
+
+### Development Builds
+
+Users who wish to do development on this flow should use the below steps.
+This will allow changes to both the local files and the external dependencies (psgen, sail, riscv-sail), and to run the intermediate build steps manually.
+
+Build instructions:
+- Identical to the Reproducible Build steps, but use `nix develop .#formal-dev`.
+
+Invoking `make jg` using the provided makefile would run the following steps, which can also be executed manually:
+- `make fusesoc` fetches the necessary RTL using the FuseSoC tool and makes a local copy inside `build/`.
+  This also creates a filelist (`.scr`) that Jasper knows how to ingest.
+  This step also patches the Ibex RTL with the changes described [in the section below](#rtl-changes).
 - `make psgen` to build the SV for the proofs given in `thm/`
- `make sv` to build the SV translation of the Sail compiler. Will invoke `buildspec.py`, which can be configured to adjust which instructions are defined. By default all of them are, this is correct but slow.
- Make the changes to Ibex described in the RTL changes.
- `SAIL_DIR=<path to sail compiler source> jg verify.tcl`
+- `make sv` to build the SV translation of the Sail compiler.
+  Will invoke `buildspec.py`, which can be configured to adjust which instructions are defined.
+  By default all of them are, this is correct but slow.
+- `jg verify.tcl` invokes Jasper interactively, sourcing the configuration & run script.
+  Requires the above two steps to be executed first.
+
+Local versions of the external dependencies can be modified and linked into the build via Environment Variables as follows:
+- psgen: (`https://github.com/mndstrmr/psgen`)
+  - Clone the repository to a local directory \<psgen-dir\> : `git clone https://github.com/mndstrmr/psgen`
+  - Make local changes...
+  - Build in place with `nix develop --command bash -c "go build"`
+  - In the formal-dev shell:
+    - Add new psgen binary to head of path with `export PATH=<psgen-dir>:$PATH`
+- lowRISC Sail: (`https://github.com/lowrisc/sail` on the `lowrisc` branch).
+  - Clone the repository to a local directory \<sail-dir\> : `git clone --branch lowrisc https://github.com/lowrisc/sail`
+  - Make local changes...
+  - Build in place with `nix develop github:lowrisc/ibex#lowrisc_sail --command bash -c "dune build --release && dune install --prefix ."`
+  - In the formal-dev shell:
+    - Add new Sail binary to head of path with `export PATH=<sail-dir>/bin:$PATH`
+    - Update `LOWRISC_SAIL_SRC` to point to the source root with `export LOWRISC_SAIL_SRC=<sail-dir>`.
+- sail-riscv: (`https://github.com/lowrisc/sail-riscv`)
+  - Clone the repository to a local directory \<sail-riscv-dir\> (`git clone https://github.com/lowrisc/sail-riscv`).
+  - Make local changes...
+  - In the formal-dev shell:
+    - Update `LOWRISC_SAIL_RISCV_SRC` to point to the source root with `export LOWRISC_SAIL_RISCV_SRC=<sail-riscv-dir>`.

 ## Conclusivity
 All properties are currently known to be conclusive, with the exception of M-Types. The later stages (Memory, Top, RegMatch and Wrap and some Liveness) generally take longer.
--- a/dv/formal/poetry.lock
+++ b/dv/formal/poetry.lock
@ -0,0 +1,520 @@
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+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:f90a4cd061914a60bd51c68bcb4357086991bd0bb93d8aa66a6da7701370708f"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:def7400461c3a3f26e49078302e1c1b38f6752342c77e3cf72ce91ca69fb1bc1"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-musllinux_1_2_aarch64.whl", hash = "sha256:65794e4048ee837494aea3c21a28ad5fc080994dfba5b036cf84de37f7ad5074"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-musllinux_1_2_i686.whl", hash = "sha256:faefcc78f53a88f3076b7f8be0a8f8d35133a3ecf7f3770895c25f8813460f08"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-musllinux_1_2_x86_64.whl", hash = "sha256:5b4f105deeffa28bbcdff6c49b34e74903139afa690e35d2d9e3c2c2fba18cec"},
+    {file = "rpds_py-0.20.0-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:fdfc3a892927458d98f3d55428ae46b921d1f7543b89382fdb483f5640daaec8"},
+    {file = "rpds_py-0.20.0.tar.gz", hash = "sha256:d72a210824facfdaf8768cf2d7ca25a042c30320b3020de2fa04640920d4e121"},
+]
+
+[[package]]
+name = "simplesat"
+version = "0.8.2"
+description = "Simple SAT solvers for use in Enstaller"
+optional = false
+python-versions = "*"
+files = [
+    {file = "simplesat-0.8.2-py2.py3-none-any.whl", hash = "sha256:76dd637db54c998badb988baafbc2bd4cc6689364580588487bc2634a6ab55fd"},
+    {file = "simplesat-0.8.2.tar.gz", hash = "sha256:1943f32735b03b048e20953a0145b2b61d2eb7a9dcc471a74f214afe9fa8d858"},
+]
+
+[package.dependencies]
+attrs = ">=17.4.0"
+okonomiyaki = ">=0.16.6"
+six = ">=1.10.0"
+
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+
+[[package]]
+name = "wheel"
+version = "0.41.2"
+description = "A built-package format for Python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "wheel-0.41.2-py3-none-any.whl", hash = "sha256:75909db2664838d015e3d9139004ee16711748a52c8f336b52882266540215d8"},
+    {file = "wheel-0.41.2.tar.gz", hash = "sha256:0c5ac5ff2afb79ac23ab82bab027a0be7b5dbcf2e54dc50efe4bf507de1f7985"},
+]
+
+[package.extras]
+test = ["pytest (>=6.0.0)", "setuptools (>=65)"]
+
+[[package]]
+name = "zipfile2"
+version = "0.0.12"
+description = "An improved ZipFile class."
+optional = false
+python-versions = "*"
+files = [
+    {file = "zipfile2-0.0.12-py2.py3-none-any.whl", hash = "sha256:b9adf577d825461480e485027116c035f666b72ac3911af71aa93da6e0579eb8"},
+    {file = "zipfile2-0.0.12.tar.gz", hash = "sha256:7376f7c968717ac895ef862da913e790cf1b518caf56c4822c04684c46a8a608"},
+]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.10"
+content-hash = "77df0bf8de469f836b38ed006e00b9e70ed430601f2561999dd41b83ea5a22d6"
--- a/dv/formal/pyproject.toml
+++ b/dv/formal/pyproject.toml
@ -0,0 +1,26 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+[tool.poetry]
+name = "ibex"
+version = "0.0.0"
+description = "Ibex"
+authors = []
+license = "Apache 2.0"
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.10"
+packaging = "23.1"
+anytree = "2.8.0"
+hjson = "3.1.0"
+mako = "1.1.6"
+pyyaml = "6.0"
+wheel = "0.41.2"
+edalize = { git = "https://github.com/lowRISC/edalize.git", tag = "v0.4.0"}
+fusesoc = { git = "https://github.com/lowRISC/fusesoc.git", tag = "ot-0.4" }
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
--- a/flake.lock
+++ b/flake.lock
@ -0,0 +1,378 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gomod2nix": {
+      "inputs": {
+        "flake-utils": [
+          "psgen",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "psgen",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1717050755,
+        "narHash": "sha256-C9IEHABulv2zEDFA+Bf0E1nmfN4y6MIUe5eM2RCrDC0=",
+        "owner": "tweag",
+        "repo": "gomod2nix",
+        "rev": "31b6d2e40b36456e792cd6cf50d5a8ddd2fa59a1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "tweag",
+        "repo": "gomod2nix",
+        "type": "github"
+      }
+    },
+    "lowrisc-nix": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "poetry2nix": "poetry2nix",
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1724163813,
+        "narHash": "sha256-jdVhaKwR39AqQcSIe2euQkZwsu88qRcjsehO57tchVA=",
+        "owner": "lowrisc",
+        "repo": "lowrisc-nix",
+        "rev": "7412a5a201df3e5837b42a9b831bdf5bb9105a3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lowrisc",
+        "repo": "lowrisc-nix",
+        "type": "github"
+      }
+    },
+    "lowrisc_sail": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1745587367,
+        "narHash": "sha256-VbUampJQcjgnCi/9rRSC0V13i/MLBS75sfRrrc/HLpc=",
+        "owner": "lowrisc",
+        "repo": "sail",
+        "rev": "4832414fca03b3103121a15a021939654050159b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lowrisc",
+        "ref": "lowrisc",
+        "repo": "sail",
+        "type": "github"
+      }
+    },
+    "lowrisc_sail_riscv": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1722338144,
+        "narHash": "sha256-ALWgTa/AxCnHJlK/RSZ6856xK2lwHc6CzHGtf4d8C0s=",
+        "owner": "lowrisc",
+        "repo": "sail-riscv",
+        "rev": "81a266b6f65365b34180af7b91708265da653878",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lowrisc",
+        "ref": "81a266b6f65365b34180af7b91708265da653878",
+        "repo": "sail-riscv",
+        "type": "github"
+      }
+    },
+    "mkshell-minimal": {
+      "locked": {
+        "lastModified": 1700988624,
+        "narHash": "sha256-KJyiF67zVYOBkNltKhJATfSj+gfRFX9dSFIWDEBy2nQ=",
+        "owner": "viperML",
+        "repo": "mkshell-minimal",
+        "rev": "6b0868be06da900b5fe6ece05616b84e3cbd7944",
+        "type": "github"
+      },
+      "original": {
+        "owner": "viperML",
+        "repo": "mkshell-minimal",
+        "type": "github"
+      }
+    },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "lowrisc-nix",
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1703863825,
+        "narHash": "sha256-rXwqjtwiGKJheXB43ybM8NwWB8rO2dSRrEqes0S7F5Y=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "5163432afc817cf8bd1f031418d1869e4c9d5547",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
+    "nix-github-actions_2": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1703863825,
+        "narHash": "sha256-rXwqjtwiGKJheXB43ybM8NwWB8rO2dSRrEqes0S7F5Y=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "5163432afc817cf8bd1f031418d1869e4c9d5547",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1724316499,
+        "narHash": "sha256-Qb9MhKBUTCfWg/wqqaxt89Xfi6qTD3XpTzQ9eXi3JmE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "797f7dc49e0bc7fab4b57c021cdf68f595e47841",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.05",
+        "type": "indirect"
+      }
+    },
+    "poetry2nix": {
+      "inputs": {
+        "flake-utils": [
+          "lowrisc-nix",
+          "flake-utils"
+        ],
+        "nix-github-actions": "nix-github-actions",
+        "nixpkgs": [
+          "lowrisc-nix",
+          "nixpkgs"
+        ],
+        "systems": "systems_2",
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1723854676,
+        "narHash": "sha256-+BrHfNuXrqeE7PoV6xDaoh0joYiJkvTTCIV0fFR3THw=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "d650118bce34c0238b9b54f23f7f173f9e4db867",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    "poetry2nix_2": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nix-github-actions": "nix-github-actions_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems_3",
+        "treefmt-nix": "treefmt-nix_2"
+      },
+      "locked": {
+        "lastModified": 1724417163,
+        "narHash": "sha256-gD0N0pnKxWJcKtbetlkKOIumS0Zovgxx/nMfOIJIzoI=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "7619e43c2b48c29e24b88a415256f09df96ec276",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    "psgen": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "gomod2nix": "gomod2nix",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1723038779,
+        "narHash": "sha256-L/toJC6lyeVJy2Uswse8aCrhdt0mTxDfn8t0NpNVn/I=",
+        "owner": "mndstrmr",
+        "repo": "psgen",
+        "rev": "2d0c1e0690cf6c3b9b1bf4f51bccab4698f4e21f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "mndstrmr",
+        "repo": "psgen",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "lowrisc-nix": "lowrisc-nix",
+        "lowrisc_sail": "lowrisc_sail",
+        "lowrisc_sail_riscv": "lowrisc_sail_riscv",
+        "mkshell-minimal": "mkshell-minimal",
+        "nixpkgs": "nixpkgs",
+        "poetry2nix": "poetry2nix_2",
+        "psgen": "psgen"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "lowrisc-nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1724034091,
+        "narHash": "sha256-b1g7w0sw+MDAhUAeCoX1vlTghsqcDZkxr+k9OZmxPa8=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "c7d36e0947826e0751a5214ffe82533fbc909bc0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "lowrisc-nix",
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1719749022,
+        "narHash": "sha256-ddPKHcqaKCIFSFc/cvxS14goUhCOAwsM1PbMr0ZtHMg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "8df5ff62195d4e67e2264df0b7f5e8c9995fd0bd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
+    "treefmt-nix_2": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1719749022,
+        "narHash": "sha256-ddPKHcqaKCIFSFc/cvxS14goUhCOAwsM1PbMr0ZtHMg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "8df5ff62195d4e67e2264df0b7f5e8c9995fd0bd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
--- a/flake.nix
+++ b/flake.nix
@ -0,0 +1,146 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+{
+  description = "Nix Flake for Ibex development and testing.";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-24.05";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    poetry2nix = {
+      url = "github:nix-community/poetry2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+    mkshell-minimal.url = "github:viperML/mkshell-minimal";
+
+    lowrisc-nix = {
+      url = "github:lowrisc/lowrisc-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+
+    psgen = {
+      url = "github:mndstrmr/psgen";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+    lowrisc_sail = {
+      url = "github:lowrisc/sail?ref=lowrisc";
+      flake = false;
+    };
+    lowrisc_sail_riscv = {
+      url = "github:lowrisc/sail-riscv?ref=81a266b6f65365b34180af7b91708265da653878";
+      flake = false;
+    };
+  };
+
+  # The lowRISC public nix-cache contains builds of nix packages used by lowRISC, primarily coming from github:lowRISC/lowrisc-nix.
+  nixConfig = {
+    extra-substituters = ["https://nix-cache.lowrisc.org/public/"];
+    extra-trusted-public-keys = ["nix-cache.lowrisc.org-public-1:O6JLD0yXzaJDPiQW1meVu32JIDViuaPtGDfjlOopU7o="];
+  };
+
+  outputs = inputs@{self, ...}:
+    let
+
+      # System types to support.
+      supportedSystems = with inputs.flake-utils.lib.system; [
+        x86_64-linux
+      ];
+
+    in inputs.flake-utils.lib.eachSystem supportedSystems (system:
+      let
+
+        pkgs = import inputs.nixpkgs {
+          inherit system;
+        };
+        inherit (pkgs) lib;
+
+        mkshell-minimal = inputs.mkshell-minimal pkgs;
+
+        # lowRISC fork of the Sail repository. The SAIL -> SV flow is used to generate the reference model.
+        lowrisc_sail = import ./nix/lowrisc_sail.nix {
+          inherit pkgs;
+          src = inputs.lowrisc_sail;
+        };
+
+        # Sail RISC-V model with changes for Ibex
+        lowrisc_sail_riscv.src = (import ./nix/lowrisc_sail_riscv.nix {
+          inherit pkgs;
+          src = inputs.lowrisc_sail_riscv;
+        }).src;
+
+        # Create a python package set suitable for the formal flow
+        # - The file dv/formal/pyproject.toml defines the package set for this environment
+        # - Using the fusesoc .core files in this repo requires a lowrisc-fork of fusesoc, so this
+        #   file specifies the forked repository. Most other python package dependencies are in
+        #   support of fusesoc.
+        formal_python_env = let
+          poetry2nix = inputs.poetry2nix.lib.mkPoetry2Nix {inherit pkgs;};
+          lowriscPoetryOverrides = inputs.lowrisc-nix.lib.poetryOverrides {inherit pkgs;};
+        in
+          poetry2nix.mkPoetryEnv {
+            projectDir = ./dv/formal;
+            overrides = [
+              poetry2nix.defaultPoetryOverrides
+              lowriscPoetryOverrides
+            ];
+          };
+
+        in {
+          packages = {
+            # Export the package for the lowrisc fork of the sail compiler. This allows us
+            # to re-use its build environment when using the .#formal-dev flow.
+            inherit lowrisc_sail;
+          };
+          devShells = rec {
+            formal = mkshell-minimal {
+              packages = [
+                inputs.psgen.packages.${system}.default
+                lowrisc_sail
+                formal_python_env
+              ] ++ (with pkgs; [
+                gnumake
+                patch
+              ]);
+              shellHook = let
+                # The formal environment has an untracked external requirement on Cadence Jasper.
+                # Add a check here which will prevent launching the devShell if Jasper is not found on the user's path.
+                # TODO: Is this robust? Do we want to check available features?
+                check_jg = ''
+                  if ! command -v jg &>/dev/null; then
+                    echo "Jasper not found on path. Not launching devShell."
+                    exit 1
+                  fi
+                '';
+              in ''
+                ${check_jg}
+                # The following environment variables are used by the formal build scripts to pick up the locations
+                # of the external source-file dependencies.
+                # The can be re-exported manually for development (see .#formal-dev)
+                export LOWRISC_SAIL_SRC=${lowrisc_sail.src}
+                export LOWRISC_SAIL_RISCV_SRC=${lowrisc_sail_riscv.src}
+              '';
+            };
+
+            formal-dev = formal.overrideAttrs (prev: {
+              shellHook = prev.shellHook + ''
+                cat << EOF
+                ========================================================================================
+                This is the development shell. By default it is identical to the .#formal shell.
+                In order to use dev dependencies (e.g. psgen or Sail), prepend the new binaries to PATH:
+                  export PATH=<bindir>:\$PATH
+                If developing the Sail sources, also update LOWRISC_SAIL_SRC:
+                  export LOWRISC_SAIL_SRC=<dirname>
+                To use a local version of Ibex's sail-riscv model, also update LOWRISC_SAIL_RISCV_SRC:
+                  export LOWRISC_SAIL_RISCV_SRC=<dirname>
+                ========================================================================================
+                EOF
+              '';
+            });
+          };
+        }
+    );
+}
--- a/nix/lowrisc_sail.nix
+++ b/nix/lowrisc_sail.nix
@ -0,0 +1,23 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+# Override the upstream sail package definition to use the lowRISC fork
+{
+  pkgs,
+  src,
+}:
+
+pkgs.ocamlPackages.sail.overrideAttrs (prev: {
+  pname = "lowrisc_sail";
+  inherit src;
+
+  # The lowRISC fork is older than upstream, and requires additional dependencies
+  # from those specified upsteam to build. Add them here.
+  propagatedBuildInputs =
+    prev.propagatedBuildInputs ++ (with pkgs.ocamlPackages; [
+      menhirLib
+    ]) ++ (with pkgs; [
+      z3
+    ]);
+})
--- a/nix/lowrisc_sail_riscv.nix
+++ b/nix/lowrisc_sail_riscv.nix
@ -0,0 +1,18 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+# RISCV Sail model with changes for Ibex
+{
+  pkgs,
+  src,
+}:
+
+pkgs.sail-riscv-rv32.overrideAttrs {
+  pname = "lowrisc_sail_riscv";
+  inherit src;
+
+  # The upstream patches does not apply to our older version of riscv_sail.
+  patches = [ ];
+}
+