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; Copyright (C) 2000 Panagiotis Manolios
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
; Written by Panagiotis Manolios who can be reached as follows.
; Email: pete@cs.utexas.edu
; Postal Mail:
; Department of Computer Science
; The University of Texas at Austin
; Austin, TX 78701 USA
#|
The MA specification of Sawada's machine with interrupts.
|#
(in-package "ACL2")
(include-book "isa-int")
(include-book "../top/non-det-macros")
(defun latch1 (validp op rc ra rb)
(list 'latch1 validp op rc ra rb))
(defmacro latch1-validp () 1)
(defmacro latch1-op () 2)
(defmacro latch1-rc () 3)
(defmacro latch1-ra () 4)
(defmacro latch1-rb () 5)
(defun latch2 (validp op rc ra-val rb-val)
(list 'latch2 validp op rc ra-val rb-val))
(defmacro latch2-validp () 1)
(defmacro latch2-op () 2)
(defmacro latch2-rc () 3)
(defmacro latch2-ra-val () 4)
(defmacro latch2-rb-val () 5)
(defun MA-state (pc regs mem latch1 latch2 int)
(list 'MA pc regs mem latch1 latch2 int))
(defun MA-p (x)
(equal (car x) 'MA))
(defmacro MA-pc () 1)
(defmacro MA-regs () 2)
(defmacro MA-mem () 3)
(defmacro MA-latch1 () 4)
(defmacro MA-latch2 () 5)
(defmacro MA-int () 6)
(defun ALU-output (op val1 val2)
(cond ((equal op 0)
(+ val1 val2))
(t (* val1 val2))))
(defun step-regs (MA)
(let ((latch2 (nth (MA-latch2) MA)))
(if (and (nth (latch2-validp) latch2)
(bor (equal (nth (latch2-op) latch2) 0)
(equal (nth (latch2-op) latch2) 1)))
(update-valuation (nth (latch2-rc) latch2)
(ALU-output (nth (latch2-op) latch2)
(nth (latch2-ra-val) latch2)
(nth (latch2-rb-val) latch2))
(nth (MA-regs) MA))
(nth (MA-regs) MA))))
(defun stall-condp (MA)
(let ((latch1 (nth (MA-latch1) MA))
(latch2 (nth (MA-latch2) MA)))
(and (nth (latch2-validp) latch2)
(nth (latch1-validp) latch1)
(bor (equal (nth (latch1-ra) latch1)
(nth (latch2-rc) latch2))
(equal (nth (latch1-rb) latch1)
(nth (latch2-rc) latch2))))))
(defun step-latch1 (MA)
(let ((latch1 (nth (MA-latch1) MA))
(inst (value-of (nth (MA-pc) MA) (nth (MA-mem) MA))))
(cond ((stall-condp MA)
latch1)
(t (latch1 t
(nth (Inst-opcode) inst)
(nth (Inst-rc) inst)
(nth (Inst-ra) inst)
(nth (Inst-rb) inst))))))
(defun step-latch2 (MA)
(let ((latch1 (nth (MA-latch1) MA)))
(if (nth (latch1-validp) latch1)
(latch2 (not (stall-condp MA))
(nth (latch1-op) latch1)
(nth (latch1-rc) latch1)
(value-of (nth (latch1-ra) latch1)
(nth (MA-regs) MA))
(value-of (nth (latch1-rb) latch1)
(nth (MA-regs) MA)))
(update-nth (latch2-validp) nil (nth (MA-latch2) MA)))))
(defun step-pc (MA)
(if (stall-condp MA)
(nth (MA-pc) MA)
(1+ (nth (MA-pc) MA))))
(defun b-to-num (x)
(if x 1 0))
(defun shift-pc (latch1 latch2)
(+ (b-to-num (nth (latch1-validp) latch1))
(b-to-num (nth (latch2-validp) latch2))))
(defun committed-MA (MA)
(let ((pc (nth (MA-pc) MA))
(regs (nth (MA-regs) MA))
(mem (nth (MA-mem) MA))
(latch1 (nth (MA-latch1) MA))
(latch2 (nth (MA-latch2) MA))
(int (nth (MA-int) MA)))
(MA-state
(- pc (shift-pc latch1 latch2))
regs
mem
(update-nth (latch1-validp) nil latch1)
(update-nth (latch2-validp) nil latch2)
int)))
(defun MA-step (MA i)
(cond ((nth (MA-int) MA)
(update-nth (MA-mem)
(int-handler (nth (MA-regs) MA)
(nth (MA-mem) MA)
(nth (MA-int) MA))
(update-nth (MA-int)
nil
(committed-MA MA))))
(i (update-nth (MA-int) i (committed-MA MA)))
(t (MA-state (step-pc MA)
(step-regs MA)
(nth (MA-mem) MA)
(step-latch1 MA)
(step-latch2 MA)
nil))))
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