Apple-2-Tools/bradgrantham-apple2e
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templatize CPU6502 in anticipation of single-header

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Brad Grantham 2018-09-08 17:18:25 -07:00
parent 4e305cb6ad
commit 5f1a3be90d
1 changed files with 13 additions and 11 deletions
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24
apple2e.cpp
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@ -1367,6 +1367,7 @@ template<class CLK, class BUS>
struct CPU6502
{
CLK &clk;
BUS &bus;
unsigned char a, x, y, s, p;
static const unsigned char N = 0x80;
@ -1384,8 +1385,9 @@ struct CPU6502
BRK,
INT,
} exception;
CPU6502(CLK& clk_) :
CPU6502(CLK& clk_, BUS& bus_) :
clk(clk_),
bus(bus_),
a(0),
x(0),
y(0),
@ -1394,15 +1396,15 @@ struct CPU6502
exception(RESET)
{
}
void stack_push(BUS& bus, unsigned char d)
void stack_push(unsigned char d)
{
bus.write(0x100 + s--, d);
}
unsigned char stack_pull(BUS& bus)
unsigned char stack_pull()
{
return bus.read(0x100 + ++s);
}
unsigned char read_pc_inc(BUS& bus)
unsigned char read_pc_inc()
{
return bus.read(pc++);
}
@ -1421,13 +1423,13 @@ struct CPU6502
{
p &= ~flag;
}
void reset(BUS& bus)
void reset()
{
s = 0xFD;
pc = bus.read(0xFFFC) + bus.read(0xFFFD) * 256;
exception = NONE;
}
void irq(BUS& bus)
void irq()
{
stack_push(bus, (pc + 0) >> 8);
stack_push(bus, (pc + 0) & 0xFF);
@ -1435,7 +1437,7 @@ struct CPU6502
pc = bus.read(0xFFFE) + bus.read(0xFFFF) * 256;
exception = NONE;
}
void brk(BUS& bus)
void brk()
{
stack_push(bus, (pc - 1) >> 8);
stack_push(bus, (pc - 1) & 0xFF);
@ -1443,7 +1445,7 @@ struct CPU6502
pc = bus.read(0xFFFE) + bus.read(0xFFFF) * 256;
exception = NONE;
}
void nmi(BUS& bus)
void nmi()
{
stack_push(bus, (pc + 0) >> 8);
stack_push(bus, (pc + 0) & 0xFF);
@ -1477,7 +1479,7 @@ struct CPU6502
return (p & flag) != 0;
}
#if 0
int get_operand(BUS& bus, Operand oper)
int get_operand(Operand oper)
{
switch(oper)
{
@ -1502,7 +1504,7 @@ struct CPU6502
if(flags & N)
flag_change(N, v & 0x80);
}
void cycle(BUS& bus)
void cycle()
{
if(exception == RESET) {
if(debug & DEBUG_STATE) printf("RESET\n");
@ -3218,7 +3220,7 @@ int main(int argc, char **argv)
}
}
CPU6502<system_clock, bus_frontend> cpu(clk);
CPU6502<system_clock, bus_frontend> cpu(clk, bus_frontend);
atexit(cleanup);