180 lines
4.0 KiB
D
180 lines
4.0 KiB
D
/+
|
|
+ cpu/d6502.d
|
|
+
|
|
+ Copyright: 2012 Ed McCardell, 2007 Gerald Stocker
|
|
+
|
|
+ This file is part of twoapple-reboot.
|
|
+
|
|
+ twoapple-reboot 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.
|
|
+
|
|
+ twoapple-reboot 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 twoapple-reboot; if not, write to the Free Software
|
|
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
+/
|
|
|
|
|
|
module cpu.d6502;
|
|
|
|
|
|
import std.array, std.format;
|
|
|
|
import cpu.ctfe_d6502;
|
|
|
|
|
|
template is6502(T)
|
|
{
|
|
enum is6502 = __traits(getMember, T, "_chip") == "6502";
|
|
}
|
|
|
|
template is65C02(T)
|
|
{
|
|
enum is65C02 = __traits(getMember, T, "_chip") == "65C02";
|
|
}
|
|
|
|
|
|
final class Cpu(string chip, MEM, CLK)
|
|
if (__traits(compiles, {
|
|
MEM m; ubyte val; ushort addr;
|
|
val = m.read(addr);
|
|
m.write(addr, val);
|
|
CLK c; int cycles;
|
|
version(Cumulative) c.tick(cycles);
|
|
else c.tick();
|
|
}))
|
|
{
|
|
static assert(chip == "6502" || chip == "65C02" || chip == "65c02");
|
|
enum _isCpu = true;
|
|
enum _chip = (chip == "6502" ? "6502" : "65C02");
|
|
|
|
version(RunTest)
|
|
{
|
|
struct _Mem
|
|
{
|
|
ubyte delegate(ushort addr) read;
|
|
void delegate(ushort addr, ubyte val) write;
|
|
}
|
|
_Mem memory;
|
|
|
|
struct _Clock
|
|
{
|
|
version(Cumulative)
|
|
void delegate(int cycles) tick;
|
|
else
|
|
void delegate() tick;
|
|
}
|
|
_Clock clock;
|
|
}
|
|
else
|
|
{
|
|
MEM memory;
|
|
CLK clock;
|
|
}
|
|
|
|
ubyte A, X, Y, S;
|
|
ushort PC;
|
|
|
|
// The status flags.
|
|
ubyte N, Z;
|
|
bool V, D, I, C;
|
|
|
|
version(OpDelegates)
|
|
{
|
|
mixin(OpArrayDef());
|
|
version(Cumulative) { int cycles; }
|
|
ushort address, base;
|
|
ubyte data;
|
|
}
|
|
|
|
// TODO: other methods for stopping cpu
|
|
bool keepRunning;
|
|
|
|
this(MEM memory, CLK clock)
|
|
{
|
|
version(RunTest) {}
|
|
else
|
|
{
|
|
this.memory = memory;
|
|
this.clock = clock;
|
|
}
|
|
version(OpDelegates) mixin(OpArrayInit());
|
|
}
|
|
|
|
final void statusFromByte(ubyte p)
|
|
{
|
|
N = p;
|
|
V = ((p & 0x40) != 0);
|
|
D = ((p & 0x08) != 0);
|
|
I = ((p & 0x04) != 0);
|
|
Z = ((p & 0x02) ? 0 : 1);
|
|
C = ((p & 0x01) != 0);
|
|
}
|
|
|
|
final ubyte statusToByte()
|
|
{
|
|
return (C ? 0x01 : 0) |
|
|
((Z == 0) ? 0x02 : 0) |
|
|
(I ? 0x04 : 0) |
|
|
(D ? 0x08 : 0) |
|
|
0x30 | // break and reserved both set
|
|
(V ? 0x40 : 0) |
|
|
(N & 0x80);
|
|
}
|
|
|
|
final void run(bool continuous)
|
|
{
|
|
keepRunning = continuous;
|
|
// TODO debugging info?
|
|
ubyte opcode;
|
|
static if (!opArray)
|
|
{
|
|
version(Cumulative) { int cycles; }
|
|
ushort address, base;
|
|
ubyte data;
|
|
}
|
|
do {
|
|
version(Cumulative)
|
|
{
|
|
static if (!opArray) cycles = 1;
|
|
}
|
|
else
|
|
{
|
|
clock.tick();
|
|
}
|
|
// XXX check signals, NMI/IRQ delays, etc.
|
|
opcode = memory.read(PC++);
|
|
mixin(OpExecute(_chip));
|
|
} while (keepRunning);
|
|
}
|
|
|
|
version(OpDelegates) mixin (OpMethods(_chip));
|
|
}
|
|
|
|
|
|
enum ushort IRQ_VECTOR = 0xFFFE;
|
|
|
|
|
|
//alias Cpu!("6502", false, false) T1;
|
|
//alias Cpu!("6502", false, true) T2;
|
|
//alias Cpu!("6502", true, false) T3;
|
|
//alias Cpu!("6502", true, true) T4;
|
|
//alias Cpu!("65C02", false, false) T5;
|
|
//alias Cpu!("65C02", false, true) T6;
|
|
//alias Cpu!("65C02", true, false) T7;
|
|
//alias Cpu!("65C02", true, true) T8;
|
|
|
|
/+
|
|
void main()
|
|
{
|
|
import std.stdio;
|
|
writeln(OpBody(0x11, "6502", true, false));
|
|
}
|
|
+/
|