43 lines
1.9 KiB
C++
43 lines
1.9 KiB
C++
/***************************************************************************
|
|
* Copyright (C) 2007 by Sindre Aamås *
|
|
* aamas@stud.ntnu.no *
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License version 2 as *
|
|
* published by the Free Software Foundation. *
|
|
* *
|
|
* 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 version 2 for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU General Public License *
|
|
* version 2 along with this program; if not, write to the *
|
|
* Free Software Foundation, Inc., *
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
|
|
***************************************************************************/
|
|
#include "interrupter.h"
|
|
#include "memory.h"
|
|
|
|
namespace gambatte {
|
|
|
|
Interrupter::Interrupter(unsigned short &SP_in, unsigned short &PC_in) :
|
|
SP(SP_in),
|
|
PC(PC_in)
|
|
{}
|
|
|
|
unsigned long Interrupter::interrupt(const unsigned address, unsigned long cycleCounter, Memory &memory) {
|
|
cycleCounter += 8;
|
|
SP = (SP - 1) & 0xFFFF;
|
|
memory.write(SP, PC >> 8, cycleCounter);
|
|
cycleCounter += 4;
|
|
SP = (SP - 1) & 0xFFFF;
|
|
memory.write(SP, PC & 0xFF, cycleCounter);
|
|
PC = address;
|
|
cycleCounter += 8;
|
|
|
|
return cycleCounter;
|
|
}
|
|
|
|
}
|