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prelude_mem.sail
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/*=======================================================================================*/
/* RISCV Sail Model */
/* */
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except for the snapshots of the Lem and Sail libraries */
/* in the prover_snapshots directory (which include copies of their */
/* licences), is subject to the BSD two-clause licence below. */
/* */
/* Copyright (c) 2017-2021 */
/* Prashanth Mundkur */
/* Rishiyur S. Nikhil and Bluespec, Inc. */
/* Jon French */
/* Brian Campbell */
/* Robert Norton-Wright */
/* Alasdair Armstrong */
/* Thomas Bauereiss */
/* Shaked Flur */
/* Christopher Pulte */
/* Peter Sewell */
/* Alexander Richardson */
/* Hesham Almatary */
/* Jessica Clarke */
/* Microsoft, for contributions by Robert Norton-Wright and Nathaniel Wesley Filardo */
/* Peter Rugg */
/* Aril Computer Corp., for contributions by Scott Johnson */
/* */
/* All rights reserved. */
/* */
/* This software was developed by the above within the Rigorous */
/* Engineering of Mainstream Systems (REMS) project, partly funded by */
/* EPSRC grant EP/K008528/1, at the Universities of Cambridge and */
/* Edinburgh. */
/* */
/* This software was developed by SRI International and the University of */
/* Cambridge Computer Laboratory (Department of Computer Science and */
/* Technology) under DARPA/AFRL contract FA8650-18-C-7809 ("CIFV"), and */
/* under DARPA contract HR0011-18-C-0016 ("ECATS") as part of the DARPA */
/* SSITH research programme. */
/* */
/* This project has received funding from the European Research Council */
/* (ERC) under the European Union’s Horizon 2020 research and innovation */
/* programme (grant agreement 789108, ELVER). */
/* */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions */
/* are met: */
/* 1. Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* 2. Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in */
/* the documentation and/or other materials provided with the */
/* distribution. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' */
/* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED */
/* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A */
/* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR */
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF */
/* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND */
/* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, */
/* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT */
/* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF */
/* SUCH DAMAGE. */
/*=======================================================================================*/
/* These functions define the primitives for physical memory access.
* They depend on the XLEN of the architecture.
*
* They also depend on the type of metadata that is read and written
* to physical memory. For models that do not require this metadata,
* a unit type can be used.
*
* The underlying __read_mem and __write_mem functions are from the
* Sail library. The metadata primitives __{Read,Write}RAM_Meta are
* in prelude_mem_metadata.
*/
/* This is a slightly arbitrary limit on the maximum number of bytes
in a memory access. It helps to generate slightly better C code
because it means width argument can be fast native integer. It
would be even better if it could be <= 8 bytes so that data can
also be a 64-bit int but CHERI needs 128-bit accesses for
capabilities and SIMD / vector instructions will also need more. */
type max_mem_access : Int = 16
val write_ram = {lem: "write_ram", coq: "write_ram"} : forall 'n, 0 < 'n <= max_mem_access . (write_kind, xlenbits, atom('n), bits(8 * 'n), mem_meta) -> bool effect {wmv, wmvt}
function write_ram(wk, addr, width, data, meta) = {
/* Write out metadata only if the value write succeeds.
* It is assumed for now that this write always succeeds;
* there is currently no return value.
* FIXME: We should convert the external API for all backends
* (not just for Lem) to consume the value along with the
* metadata to ensure atomicity.
*/
let ret : bool = __write_mem(wk, sizeof(xlen), addr, width, data);
if ret then __WriteRAM_Meta(addr, width, meta);
ret
}
val write_ram_ea : forall 'n, 0 < 'n <= max_mem_access . (write_kind, xlenbits, atom('n)) -> unit effect {eamem}
function write_ram_ea(wk, addr, width) =
__write_mem_ea(wk, sizeof(xlen), addr, width)
val read_ram = {lem: "read_ram", coq: "read_ram"} : forall 'n, 0 < 'n <= max_mem_access . (read_kind, xlenbits, atom('n), bool) -> (bits(8 * 'n), mem_meta) effect {rmem, rmemt}
function read_ram(rk, addr, width, read_meta) =
let meta = if read_meta then __ReadRAM_Meta(addr, width) else default_meta in
(__read_mem(rk, sizeof(xlen), addr, width), meta)
val __TraceMemoryWrite : forall 'n 'm. (atom('n), bits('m), bits(8 * 'n)) -> unit
val __TraceMemoryRead : forall 'n 'm. (atom('n), bits('m), bits(8 * 'n)) -> unit