540 lines
10 KiB
C++
540 lines
10 KiB
C++
#include "cpu.h"
|
|
|
|
#include <algorithm>
|
|
#include <utility>
|
|
#include <iterator>
|
|
#include <vector>
|
|
#include <set>
|
|
#include <map>
|
|
#include <iostream>
|
|
#include <iomanip>
|
|
#include <fstream>
|
|
|
|
#include "nodes.h"
|
|
#include "addressbus.h"
|
|
|
|
//#define TRACE 1
|
|
|
|
CPU::CPU(AddressBus& addressBus):
|
|
addressBus(addressBus)
|
|
{
|
|
std::cout << "reading segsonly";
|
|
std::ifstream if_segs("segsonly");
|
|
if (!if_segs.is_open()) {
|
|
std::cerr << "error opening file: segs" << std::endl;
|
|
return 1;
|
|
}
|
|
|
|
int i_seg(0);
|
|
while (if_segs.good()) {
|
|
int i_segin(-1);
|
|
bool b_on(false);
|
|
if_segs >> i_segin >> b_on;
|
|
if (i_segin >= 0) {
|
|
if (i_segin != i_seg++) {
|
|
std::cerr << "error: mismatch in segsonly file near " << i_segin << std::endl;
|
|
return 1;
|
|
}
|
|
std::cout << ".";
|
|
seg s;
|
|
s.pullup = b_on;
|
|
s.pulldown = false;
|
|
s.on = false;
|
|
segs.push_back(s);
|
|
}
|
|
}
|
|
std::cout << std::endl << "read " << segs.size() << " segs" << std::endl;
|
|
|
|
|
|
|
|
std::cout << "reading trns";
|
|
std::ifstream if_trns("trns");
|
|
if (!if_trns.is_open()) {
|
|
std::cerr << "error opening file: trns" << std::endl;
|
|
return 1;
|
|
}
|
|
|
|
int i_trn(0);
|
|
while (if_trns.good()) {
|
|
std::cout << ".";
|
|
int i_trnin(-1);
|
|
int i_gate, i_c1, i_c2;
|
|
if_trns >> i_trnin >> i_gate >> i_c1 >> i_c2;
|
|
if (i_trnin >= 0) {
|
|
if (i_trnin != i_trn++) {
|
|
std::cerr << "error: mismatch in trns file near " << i_trnin << std::endl;
|
|
return 1;
|
|
}
|
|
trn t;
|
|
t.gate = i_gate;
|
|
t.c1 = i_c1;
|
|
t.c2 = i_c2;
|
|
t.on = false;
|
|
trns.push_back(t);
|
|
}
|
|
}
|
|
std::cout << std::endl << "read " << trns.size() << " trns" << std::endl;
|
|
|
|
for (int i = 0; i != trns.size(); ++i) {
|
|
trn& t = trns[i];
|
|
if (t.c1==VSS) {
|
|
t.c1 = t.c2;
|
|
t.c2 = VSS;
|
|
} else if (t.c1==VCC) {
|
|
t.c1 = t.c2;
|
|
t.c2 = VCC;
|
|
}
|
|
segs[t.gate].gates.push_back(i);
|
|
segs[t.c1].c1c2s.push_back(i);
|
|
segs[t.c2].c1c2s.push_back(i);
|
|
}
|
|
init();
|
|
|
|
std::cout << "running some..." << std::endl;
|
|
for (int i(0); i < 100; ++i) {
|
|
step();
|
|
}
|
|
std::cout << "end" << std::endl;
|
|
}
|
|
|
|
CPU::~CPU()
|
|
{
|
|
}
|
|
|
|
void CPU::tick() {
|
|
step();
|
|
step();
|
|
}
|
|
|
|
unsigned char CPU::readByte(unsigned int b7, unsigned int b6, unsigned int b5, unsigned int b4, unsigned int b3, unsigned int b2, unsigned int b1, unsigned int b0) {
|
|
return
|
|
segs[b7].on<<7 |
|
|
segs[b6].on<<6 |
|
|
segs[b5].on<<5 |
|
|
segs[b4].on<<4 |
|
|
segs[b3].on<<3 |
|
|
segs[b2].on<<2 |
|
|
segs[b1].on<<1 |
|
|
segs[b0].on;
|
|
}
|
|
|
|
unsigned short CPU::readWord(unsigned int b15, unsigned int b14, unsigned int b13, unsigned int b12, unsigned int b11, unsigned int b10, unsigned int b9, unsigned int b8, unsigned int b7, unsigned int b6, unsigned int b5, unsigned int b4, unsigned int b3, unsigned int b2, unsigned int b1, unsigned int b0) {
|
|
return
|
|
segs[b15].on<<15 |
|
|
segs[b14].on<<14 |
|
|
segs[b13].on<<13 |
|
|
segs[b12].on<<12 |
|
|
segs[b11].on<<11 |
|
|
segs[b10].on<<10 |
|
|
segs[b9].on<<9 |
|
|
segs[b8].on<<8 |
|
|
segs[b7].on<<7 |
|
|
segs[b6].on<<6 |
|
|
segs[b5].on<<5 |
|
|
segs[b4].on<<4 |
|
|
segs[b3].on<<3 |
|
|
segs[b2].on<<2 |
|
|
segs[b1].on<<1 |
|
|
segs[b0].on;
|
|
}
|
|
|
|
bool CPU::isHigh(int iseg) {
|
|
return segs[iseg].on;
|
|
}
|
|
|
|
unsigned char CPU::rData() {
|
|
return readByte(DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0);
|
|
}
|
|
|
|
unsigned short CPU::rAddr() {
|
|
return readWord(AB15,AB14,AB13,AB12,AB11,AB10,AB9,AB8,AB7,AB6,AB5,AB4,AB3,AB2,AB1,AB0);
|
|
}
|
|
|
|
unsigned char CPU::rA() {
|
|
return readByte(A7,A6,A5,A4,A3,A2,A1,A0);
|
|
}
|
|
|
|
unsigned char CPU::rX() {
|
|
return readByte(X7,X6,X5,X4,X3,X2,X1,X0);
|
|
}
|
|
|
|
unsigned char CPU::rY() {
|
|
return readByte(Y7,Y6,Y5,Y4,Y3,Y2,Y1,Y0);
|
|
}
|
|
|
|
unsigned char CPU::rS() {
|
|
return readByte(S7,S6,S5,S4,S3,S2,S1,S0);
|
|
}
|
|
|
|
unsigned short CPU::rPC() {
|
|
return readWord(PCH7,PCH6,PCH5,PCH4,PCH3,PCH2,PCH1,PCH0,PCL7,PCL6,PCL5,PCL4,PCL3,PCL2,PCL1,PCL0);
|
|
}
|
|
|
|
void pHex(unsigned char x) {
|
|
std::cout << std::setw(2) << std::setfill('0') << std::hex << (unsigned long)x << std::dec;
|
|
}
|
|
|
|
void pHexw(unsigned short x) {
|
|
std::cout << std::setw(4) << std::setfill('0') << std::hex << (unsigned long)x << std::dec;
|
|
}
|
|
|
|
void CPU::dumpSegs() {
|
|
for (int i = 0; i < segs.size(); ++i) {
|
|
std::cout << i << " ";
|
|
seg& s = segs[i];
|
|
if (s.pullup) {
|
|
std::cout << "+";
|
|
} else if (s.pulldown) {
|
|
std::cout << "-";
|
|
} else {
|
|
std::cout << "0";
|
|
}
|
|
if (s.on) {
|
|
std::cout << "+";
|
|
} else {
|
|
std::cout << "-";
|
|
}
|
|
std::cout << std::endl;
|
|
}
|
|
}
|
|
|
|
|
|
unsigned char mRead(unsigned short addr) {
|
|
unsigned char x;
|
|
x = this->addressBus.read(addr);
|
|
#ifdef TRACEMEM
|
|
std::cout << "--------------------------------------------- ";
|
|
pHex(x);
|
|
std::cout << "<";
|
|
pHexw(addr);
|
|
std::cout << std::endl;
|
|
#endif
|
|
return x;
|
|
}
|
|
|
|
void mWrite(unsigned short addr, unsigned char data) {
|
|
this->addressBus(write(addr,data);
|
|
#ifdef TRACEMEM
|
|
std::cout << "--------------------------------------------- ";
|
|
pHex(data);
|
|
std::cout << ">";
|
|
pHexw(addr);
|
|
std::cout << std::endl;
|
|
#endif
|
|
}
|
|
|
|
void CPU::dumpRegs() {
|
|
std::cout << "A";
|
|
pHex(rA());
|
|
std::cout << " X";
|
|
pHex(rX());
|
|
std::cout << " Y";
|
|
pHex(rY());
|
|
std::cout << " ";
|
|
std::cout << (isHigh(P7) ? "N" : "n");
|
|
std::cout << (isHigh(P6) ? "V" : "v");
|
|
std::cout << ".";
|
|
std::cout << (isHigh(P4) ? "B" : "b");
|
|
std::cout << (isHigh(P3) ? "D" : "d");
|
|
std::cout << (isHigh(P2) ? "I" : "i");
|
|
std::cout << (isHigh(P1) ? "Z" : "z");
|
|
std::cout << (isHigh(P0) ? "C" : "c");
|
|
std::cout << " S";
|
|
pHex(rS());
|
|
std::cout << " PC";
|
|
pHexw(rPC());
|
|
if (isHigh(CLK1OUT)) {
|
|
std::cout << " PH1 ";
|
|
}
|
|
if (isHigh(CLK2OUT)) {
|
|
std::cout << " PH2";
|
|
if (isHigh(RW)) {
|
|
std::cout << " R";
|
|
} else {
|
|
std::cout << " W";
|
|
}
|
|
}
|
|
std::cout << " DB";
|
|
pHex(rData());
|
|
std::cout << " AB";
|
|
pHexw(rAddr());
|
|
std::cout << std::endl;
|
|
//pZP();
|
|
}
|
|
|
|
|
|
void addRecalc(int n, std::set<int>& rcl) {
|
|
if (n==VCC || n==VSS) {
|
|
return;
|
|
}
|
|
rcl.insert(n);
|
|
}
|
|
|
|
void onTrans(trn& t, std::set<int>& rcl) {
|
|
if (t.on) {
|
|
return;
|
|
}
|
|
t.on = true;
|
|
addRecalc(t.c1,rcl);
|
|
// addRecalc(t.c2,rcl); //looks like this is not necessary?
|
|
}
|
|
|
|
void offTrans(trn& t, std::set<int>& rcl) {
|
|
if (!t.on) {
|
|
return;
|
|
}
|
|
t.on = false;
|
|
addRecalc(t.c1,rcl);
|
|
addRecalc(t.c2,rcl);
|
|
}
|
|
|
|
bool CPU::getGroupValue(const std::set<int>& s) {
|
|
if (s.find(VSS) != s.end()) {
|
|
return false;
|
|
}
|
|
if (s.find(VCC) != s.end()) {
|
|
return true;
|
|
}
|
|
for (std::set<int>::const_iterator i = s.begin(); i != s.end(); ++i) {
|
|
const seg& s = segs[*i];
|
|
if (s.pullup) { return true; }
|
|
if (s.pulldown) { return false; }
|
|
// if (s.on) { return true; }
|
|
}
|
|
for (std::set<int>::const_iterator i = s.begin(); i != s.end(); ++i) {
|
|
const seg& s = segs[*i];
|
|
if (s.on) { return true; }
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void CPU::addToGroup(int n, std::set<int>& s) {
|
|
const std::pair<std::set<int>::iterator,bool> ret = s.insert(n);
|
|
if (!ret.second) {
|
|
return;
|
|
}
|
|
if (n==VCC || n==VSS) {
|
|
return;
|
|
}
|
|
//std::cout << "a: " << n << std::endl;
|
|
const seg& sg = segs[n];
|
|
for (std::vector<int>::const_iterator itrn = sg.c1c2s.begin(); itrn != sg.c1c2s.end(); ++itrn) {
|
|
const trn& t = trns[*itrn];
|
|
if (t.on) {
|
|
if (t.c1==n) {
|
|
addToGroup(t.c2,s);
|
|
} else if (t.c2==n) {
|
|
addToGroup(t.c1,s);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CPU::recalcNode(int n, std::set<int>& rcl) {
|
|
if (!(n==VCC || n==VSS)) {
|
|
std::set<int> g;
|
|
addToGroup(n,g);
|
|
const bool gval = getGroupValue(g);
|
|
//std::cout << "gval: " << gval << " grp size: " << g.size() << std::endl;
|
|
for (std::set<int>::iterator ig = g.begin(); ig != g.end(); ++ig) {
|
|
//std::cout << "ig: " << *ig << std::endl;
|
|
seg& seg = segs[*ig];
|
|
if (seg.on != gval) {
|
|
//std::cout << "change seg on " << std::endl;
|
|
seg.on = gval;
|
|
for (std::vector<int>::iterator igate = seg.gates.begin(); igate != seg.gates.end(); ++igate) {
|
|
trn& t = trns[*igate];
|
|
if (seg.on) {
|
|
onTrans(t,rcl);
|
|
} else {
|
|
offTrans(t,rcl);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CPU::recalc(const std::set<int>& s) {
|
|
std::set<int> list(s);
|
|
// std::set<int> done;
|
|
for (int sane = 0; sane < 100; ++sane) {
|
|
//std::cout << "rc: " << list.size() << std::endl;
|
|
if (!list.size()) {
|
|
return;
|
|
}
|
|
std::set<int> rcl;
|
|
for (std::set<int>::const_iterator ilist = list.begin(); ilist != list.end(); ++ilist) {
|
|
recalcNode(*ilist,rcl);
|
|
//std::cout << "done recalcNode" << std::endl;
|
|
}
|
|
// done.insert(rcl.begin(),rcl.end());
|
|
// std::set<int> v;
|
|
// std::set_difference(rcl.begin(),rcl.end(),done.begin(),done.end(),std::inserter(v,v.end()));
|
|
// list = v;
|
|
// if (std::equal(list.begin(),list.end(),rcl.begin())) {
|
|
//std::cout << "hit stasis" << std::endl;
|
|
// return;
|
|
// }
|
|
list = rcl;
|
|
}
|
|
std::cerr << "ERROR: reached maximum iteration limit while recalculating CPU state" << std::endl;
|
|
}
|
|
|
|
void CPU::recalc(int n) {
|
|
std::set<int> s;
|
|
s.insert(n);
|
|
recalc(s);
|
|
}
|
|
|
|
void CPU::recalcAll() {
|
|
std::set<int> s;
|
|
for (int i = 0; i < segs.size(); ++i) {
|
|
if (!(i == VCC || i == VSS)) {
|
|
s.insert(i);
|
|
}
|
|
}
|
|
recalc(s);
|
|
}
|
|
|
|
|
|
|
|
|
|
void CPU::setSeg(int iseg, bool up) {
|
|
seg& s = segs[iseg];
|
|
s.pullup = up;
|
|
s.pulldown = !up;
|
|
}
|
|
|
|
void CPU::setHigh(int iseg) {
|
|
setSeg(iseg,true);
|
|
}
|
|
|
|
void CPU::setLow(int iseg) {
|
|
setSeg(iseg,false);
|
|
}
|
|
|
|
void CPU::putDataToChip(unsigned char data) {
|
|
/*
|
|
std::cout << "d2cpu: ";
|
|
pHex(data);
|
|
std::cout << std::endl;
|
|
*/
|
|
unsigned char x = data;
|
|
|
|
setSeg(DB0,x&1);
|
|
x >>= 1;
|
|
setSeg(DB1,x&1);
|
|
x >>= 1;
|
|
setSeg(DB2,x&1);
|
|
x >>= 1;
|
|
setSeg(DB3,x&1);
|
|
x >>= 1;
|
|
setSeg(DB4,x&1);
|
|
x >>= 1;
|
|
setSeg(DB5,x&1);
|
|
x >>= 1;
|
|
setSeg(DB6,x&1);
|
|
x >>= 1;
|
|
setSeg(DB7,x&1);
|
|
}
|
|
|
|
void CPU::readBus() {
|
|
if (isHigh(RW)) {
|
|
putDataToChip(mRead(rAddr()));
|
|
}
|
|
}
|
|
|
|
void CPU::writeBus() {
|
|
if (!isHigh(RW)) {
|
|
mWrite(rAddr(),rData());
|
|
}
|
|
}
|
|
|
|
void addDataToRecalc(std::set<int>& s) {
|
|
s.insert(DB0);
|
|
s.insert(DB1);
|
|
s.insert(DB2);
|
|
s.insert(DB3);
|
|
s.insert(DB4);
|
|
s.insert(DB5);
|
|
s.insert(DB6);
|
|
s.insert(DB7);
|
|
}
|
|
|
|
void CPU::rw() {
|
|
readBus();
|
|
std::set<int> s;
|
|
addDataToRecalc(s);
|
|
recalc(s);
|
|
writeBus();
|
|
}
|
|
|
|
void CPU::step() {
|
|
if (isHigh(CLK0)) {
|
|
setLow(CLK0);
|
|
recalc(CLK0);
|
|
} else {
|
|
setHigh(CLK0);
|
|
recalc(CLK0);
|
|
rw();
|
|
}
|
|
#ifdef TRACE
|
|
dumpRegs();
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void CPU::powerOn() {
|
|
std::cout << "initializing CPU..." << std::endl;
|
|
//dumpRegs();
|
|
//dumpSegs();
|
|
recalcAll();
|
|
//dumpSegs();
|
|
#ifdef TRACE
|
|
dumpRegs();
|
|
#endif
|
|
setHigh(VCC);
|
|
setLow(VSS);
|
|
|
|
setHigh(CLK0);
|
|
setHigh(IRQ);
|
|
setLow(RES);
|
|
setHigh(NMI);
|
|
setHigh(RDY);
|
|
setLow(SO);
|
|
|
|
std::set<int> s;
|
|
s.insert(VCC);
|
|
s.insert(VSS);
|
|
s.insert(CLK0);
|
|
s.insert(IRQ);
|
|
s.insert(RES);
|
|
s.insert(NMI);
|
|
s.insert(RDY);
|
|
s.insert(SO);
|
|
recalc(s);
|
|
//dumpSegs();
|
|
// std::cout << "recalc all" << std::endl;
|
|
// recalcAll();
|
|
rw();
|
|
#ifdef TRACE
|
|
dumpRegs();
|
|
#endif
|
|
// std::cout << "some power-up pre-reset cycles" << std::endl;
|
|
// for (int i(0); i < 10; ++i) {
|
|
// step();
|
|
// }
|
|
//
|
|
// std::cout << " RESET" << std::endl;
|
|
}
|
|
|
|
void CPU::reset() {
|
|
setHigh(RES);
|
|
recalc(RES);
|
|
}
|