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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) 2017-2023 */
/* 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 */
/* Philipp Tomsich */
/* VRULL GmbH, for contributions by its employees */
/* */
/* 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. */
/*=======================================================================================*/
/* Architectural state for the 'N' user-level interrupts standard extension. */
/* ustatus reveals a subset of mstatus */
bitfield Ustatus : xlenbits = {
UPIE : 4,
UIE : 0
}
/* This is a view, so there is no register defined. */
function lower_sstatus(s : Sstatus) -> Ustatus = {
let u = Mk_Ustatus(zero_extend(0b0));
let u = update_UPIE(u, s.UPIE());
let u = update_UIE(u, s.UIE());
u
}
function lift_ustatus(s : Sstatus, u : Ustatus) -> Sstatus = {
let s = update_UPIE(s, u.UPIE());
let s = update_UIE(s, u.UIE());
s
}
function legalize_ustatus(m : Mstatus, v : xlenbits) -> Mstatus = {
let u = Mk_Ustatus(v);
let s = lower_mstatus(m); // lower current mstatus to sstatus
let s = lift_ustatus(s, u); // get updated sstatus
let m = lift_sstatus(m, s); // lift it to an updated mstatus
m
}
bitfield Uinterrupts : xlenbits = {
UEI : 8, /* external interrupt */
UTI : 4, /* timer interrupt */
USI : 0 /* software interrupt */
}
/* Provides the uip read view of sip (s) as delegated by sideleg (d). */
function lower_sip(s : Sinterrupts, d : Sinterrupts) -> Uinterrupts = {
let u : Uinterrupts = Mk_Uinterrupts(zero_extend(0b0));
let u = update_UEI(u, s.UEI() & d.UEI());
let u = update_UTI(u, s.UTI() & d.UTI());
let u = update_USI(u, s.USI() & d.USI());
u
}
/* Provides the uie read view of sie as delegated by sideleg. */
function lower_sie(s : Sinterrupts, d : Sinterrupts) -> Uinterrupts = {
let u : Uinterrupts = Mk_Uinterrupts(zero_extend(0b0));
let u = update_UEI(u, s.UEI() & d.UEI());
let u = update_UTI(u, s.UTI() & d.UTI());
let u = update_USI(u, s.USI() & d.USI());
u
}
/* Returns the new value of sip from the previous sip (o) and the written uip (u) as delegated by sideleg (d). */
function lift_uip(o : Sinterrupts, d : Sinterrupts, u : Uinterrupts) -> Sinterrupts = {
let s : Sinterrupts = o;
let s = if d.USI() == 0b1 then update_USI(s, u.USI()) else s;
s
}
function legalize_uip(s : Sinterrupts, d : Sinterrupts, v : xlenbits) -> Sinterrupts = {
lift_uip(s, d, Mk_Uinterrupts(v))
}
/* Returns the new value of sie from the previous sie (o) and the written uie (u) as delegated by sideleg (d). */
function lift_uie(o : Sinterrupts, d : Sinterrupts, u : Uinterrupts) -> Sinterrupts = {
let s : Sinterrupts = o;
let s = if d.UEI() == 0b1 then update_UEI(s, u.UEI()) else s;
let s = if d.UTI() == 0b1 then update_UTI(s, u.UTI()) else s;
let s = if d.USI() == 0b1 then update_USI(s, u.USI()) else s;
s
}
function legalize_uie(s : Sinterrupts, d : Sinterrupts, v : xlenbits) -> Sinterrupts = {
lift_uie(s, d, Mk_Uinterrupts(v))
}
register utvec : Mtvec
register uscratch : xlenbits
register uepc : xlenbits
register ucause : Mcause
register utval : xlenbits
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