This commit is contained in:
cmosher 2011-09-01 03:06:27 +00:00
parent 6aa71fbbb9
commit 09046e9715
2 changed files with 605 additions and 0 deletions

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#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);
}

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#ifndef CPU_H
#define CPU_H
#include <vector>
#include <set>
class AddressBus;
class seg {
public:
bool pullup;
bool pulldown;
bool on;
std::vector<int> gates;
std::vector<int> c1c2s;
};
class trn {
public:
int gate;
int c1;
int c2;
bool on;
};
class CPU {
private:
std::vector<seg> segs;
std::vector<trn> trns;
unsigned char 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) {
unsigned short 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) {
bool isHigh(int iseg) {
unsigned char rData() {
unsigned short rAddr() {
unsigned char rA() {
unsigned char rX() {
unsigned char rY() {
unsigned char rS() {
unsigned short rPC() {
void dumpSegs() {
void dumpRegs() {
bool getGroupValue(const std::set<int>& s) {
void addToGroup(int n, std::set<int>& s) {
void recalcNode(int n, std::set<int>& rcl) {
void recalc(const std::set<int>& s) {
void recalc(int n) {
void recalcAll() {
void setSeg(int iseg, bool up) {
void setHigh(int iseg) {
void setLow(int iseg) {
void putDataToChip(unsigned char data) {
void readBus() {
void writeBus() {
void rw() {
void step() {
public:
CPU(AddressBus& addressBus);
~CPU();
void powerOn();
void reset();
void tick();
};
#endif