107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
/***************************************************************************
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* Copyright (C) 2010 by Sindre Aamås *
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* aamas@stud.ntnu.no *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License version 2 as *
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* published by the Free Software Foundation. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License version 2 for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* version 2 along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include "interruptrequester.h"
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#include "savestate.h"
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namespace gambatte {
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InterruptRequester::InterruptRequester() : minIntTime(0), ifreg_(0), iereg_(0) {}
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void InterruptRequester::loadState(const SaveState &state) {
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minIntTime = state.mem.minIntTime;
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ifreg_ = state.mem.ioamhram.get()[0x10F];
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iereg_ = state.mem.ioamhram.get()[0x1FF] & 0x1F;
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intFlags.set(state.mem.IME, state.mem.halted);
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eventTimes.setValue<INTERRUPTS>(intFlags.imeOrHalted() && pendingIrqs() ? minIntTime : static_cast<unsigned long>(DISABLED_TIME));
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}
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void InterruptRequester::resetCc(const unsigned long oldCc, const unsigned long newCc) {
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minIntTime = minIntTime < oldCc ? 0 : minIntTime - (oldCc - newCc);
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if (eventTimes.value(INTERRUPTS) != DISABLED_TIME)
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eventTimes.setValue<INTERRUPTS>(minIntTime);
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}
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void InterruptRequester::ei(const unsigned long cc) {
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intFlags.setIme();
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minIntTime = cc + 1;
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if (pendingIrqs())
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eventTimes.setValue<INTERRUPTS>(minIntTime);
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}
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void InterruptRequester::di() {
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intFlags.unsetIme();
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if (!intFlags.imeOrHalted())
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eventTimes.setValue<INTERRUPTS>(DISABLED_TIME);
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}
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void InterruptRequester::halt() {
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intFlags.setHalted();
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if (pendingIrqs())
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eventTimes.setValue<INTERRUPTS>(minIntTime);
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}
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void InterruptRequester::unhalt() {
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intFlags.unsetHalted();
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if (!intFlags.imeOrHalted())
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eventTimes.setValue<INTERRUPTS>(DISABLED_TIME);
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}
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void InterruptRequester::flagIrq(const unsigned bit) {
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ifreg_ |= bit;
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if (intFlags.imeOrHalted() && pendingIrqs())
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eventTimes.setValue<INTERRUPTS>(minIntTime);
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}
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void InterruptRequester::ackIrq(const unsigned bit) {
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ifreg_ ^= bit;
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di();
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}
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void InterruptRequester::setIereg(const unsigned iereg) {
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iereg_ = iereg & 0x1F;
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if (intFlags.imeOrHalted())
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eventTimes.setValue<INTERRUPTS>(pendingIrqs() ? minIntTime : static_cast<unsigned long>(DISABLED_TIME));
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}
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void InterruptRequester::setIfreg(const unsigned ifreg) {
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ifreg_ = ifreg;
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if (intFlags.imeOrHalted())
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eventTimes.setValue<INTERRUPTS>(pendingIrqs() ? minIntTime : static_cast<unsigned long>(DISABLED_TIME));
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}
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SYNCFUNC(InterruptRequester)
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{
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SSS(eventTimes);
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NSS(minIntTime);
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NSS(ifreg_);
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NSS(iereg_);
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NSS(intFlags.flags_);
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}
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}
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