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riscv_vmem_rv64.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. */
/*=======================================================================================*/
/* RV64 Supervisor-mode address translation and page-table walks. */
/* Define the architectural satp and its legalizer. */
register satp : xlenbits
function legalize_satp(a : Architecture, o : xlenbits, v : xlenbits) -> xlenbits =
legalize_satp64(a, o, v)
/* Define valid source addresses for translation */
function isValidSv39Addr(vAddr : xlenbits) -> bool = {
vAddr[63 .. 39] == (if vAddr[38] == bitone
then ones()
else zeros())
}
function isValidSv48Addr(vAddr : xlenbits) -> bool = {
vAddr[63 .. 48] == (if vAddr[47] == bitone
then ones()
else zeros())
}
/* Compute the address translation mode. */
val translationMode : (Privilege) -> SATPMode effect {rreg, escape}
function translationMode(priv) = {
if priv == Machine then Sbare
else {
let arch = architecture(get_mstatus_SXL(mstatus));
match arch {
Some(RV64) => {
let mbits : satp_mode = Mk_Satp64(satp).Mode();
match satp64Mode_of_bits(RV64, mbits) {
Some(m) => m,
None() => internal_error("invalid RV64 translation mode in satp")
}
},
Some(RV32) => {
let s = Mk_Satp32(satp[31..0]);
if s.Mode() == 0b0 then Sbare else Sv32
},
_ => internal_error("unsupported address translation arch")
}
}
}
/* Top-level address translation dispatcher */
val translateAddr_priv : (xlenbits, AccessType(ext_access_type), Privilege) -> TR_Result(xlenbits, ExceptionType) effect {escape, rmem, rmemt, rreg, wmv, wmvt, wreg}
function translateAddr_priv(vAddr, ac, effPriv) = {
let mxr : bool = mstatus.MXR() == 0b1;
let do_sum : bool = mstatus.SUM() == 0b1;
let mode : SATPMode = translationMode(effPriv);
let asid = curAsid64(satp);
let ptb = curPTB64(satp);
/* PTW extensions: initialize the PTW extension state. */
let ext_ptw : ext_ptw = init_ext_ptw;
match mode {
Sbare => TR_Address(vAddr, ext_ptw),
Sv39 => { if isValidSv39Addr(vAddr)
then match translate39(asid, ptb, vAddr[38 .. 0], ac, effPriv, mxr, do_sum, SV39_LEVELS - 1, ext_ptw) {
TR_Address(pa, ext_ptw) => TR_Address(EXTZ(pa), ext_ptw),
TR_Failure(f, ext_ptw) => TR_Failure(translationException(ac, f), ext_ptw)
}
else TR_Failure(translationException(ac, PTW_Invalid_Addr()), ext_ptw)
},
Sv48 => { if isValidSv48Addr(vAddr)
then match translate48(asid, ptb, vAddr[47 .. 0], ac, effPriv, mxr, do_sum, SV48_LEVELS - 1, ext_ptw) {
TR_Address(pa, ext_ptw) => TR_Address(EXTZ(pa), ext_ptw),
TR_Failure(f, ext_ptw) => TR_Failure(translationException(ac, f), ext_ptw)
}
else TR_Failure(translationException(ac, PTW_Invalid_Addr()), ext_ptw)
},
_ => internal_error("unsupported address translation scheme")
}
}
val translateAddr : (xlenbits, AccessType(ext_access_type)) -> TR_Result(xlenbits, ExceptionType) effect {escape, rmem, rmemt, rreg, wmv, wmvt, wreg}
function translateAddr(vAddr, ac) =
translateAddr_priv(vAddr, ac, effectivePrivilege(ac, mstatus, cur_privilege))
val flush_TLB : (option(xlenbits), option(xlenbits)) -> unit effect {rreg, wreg}
function flush_TLB(asid_xlen, addr_xlen) -> unit = {
/* Flush both Sv39 and Sv48 TLBs. */
let (addr39, addr48) : (option(vaddr39), option(vaddr48)) =
match addr_xlen {
None() => (None(), None()),
Some(a) => (Some(a[38 .. 0]), Some(a[47 .. 0]))
};
let asid : option(asid64) =
match asid_xlen {
None() => None(),
Some(a) => Some(a[15 .. 0])
};
flush_TLB39(asid, addr39);
flush_TLB48(asid, addr48)
}
function init_vmem() -> unit = {
init_vmem_sv39();
init_vmem_sv48()
}