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Made an attempt to get the Z80 at least as far as rejecting an opcode.

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This commit is contained in:
Thomas Harte 2017-05-17 21:45:23 -04:00
parent a3dafa9056
commit 17ffd604bf
2 changed files with 82 additions and 6 deletions
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75
Processors/Z80/Z80.hpp
View File

@ -117,10 +117,58 @@ template <class T> class Processor: public MicroOpScheduler<MicroOp> {
uint8_t carry_flag_, sign_result_, bit5_result_, half_carry_flag_, bit3_result_, parity_overflow_flag_, subtract_flag_;
int number_of_cycles_;
const MicroOp **program_table_;
uint8_t operation_;
void decode_base_operation(uint8_t operation) {
#define XX nullptr
static const MicroOp *base_program_table[256] = {
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
XX, XX, XX, XX, XX, XX, XX, XX,
};
if(!base_program_table[operation]) {
printf("Unknown Z80 operation %02x!!!\n", operation_);
}
schedule_program(base_program_table[operation]);
// program_table_ = base_program_table;
}
public:
Processor() {
// set_base_program_table();
}
/*!
Runs the Z80 for a supplied number of cycles.
@ -136,11 +184,19 @@ template <class T> class Processor: public MicroOpScheduler<MicroOp> {
{ MicroOp::DecodeOperation },
{ MicroOp::MoveToNextProgram }
};
schedule_program(fetch_decode_execute);
const MicroOp *operation = &scheduled_programs_[schedule_programs_read_pointer_][schedule_program_program_counter_];
#define checkSchedule() \
if(!scheduled_programs_[schedule_programs_read_pointer_]) {\
schedule_program(fetch_decode_execute);\
}
number_of_cycles_ += number_of_cycles;
checkSchedule();
while(1) {
const MicroOp *operation = &scheduled_programs_[schedule_programs_read_pointer_][schedule_program_program_counter_];
schedule_program_program_counter_++;
switch(operation->type) {
case MicroOp::BusOperation:
if(number_of_cycles_ < operation->machine_cycle.cycle_length()) {
@ -150,16 +206,23 @@ template <class T> class Processor: public MicroOpScheduler<MicroOp> {
break;
case MicroOp::MoveToNextProgram:
move_to_next_program();
operation--;
schedule_program_program_counter_--;
checkSchedule();
break;
case MicroOp::DecodeOperation: {
pc_.full++;
decode_base_operation(operation_);
// const MicroOp *next_operation = program_table_[operation_];
// if(!next_operation) {
// printf("Unknown Z80 operation %02x!!!\n", operation_);
// return;
// }
// schedule_program(next_operation);
} break;
default:
printf("Unhandled Z80 operation %d\n", operation->type);
return;
}
operation++;
schedule_program_program_counter_++;
}
}

13
Processors/Z80/Z80AllRAM.cpp
View File

@ -14,5 +14,18 @@ using namespace CPU::Z80;
AllRAMProcessor::AllRAMProcessor() : ::CPU::AllRAMProcessor(65536) {}
int AllRAMProcessor::perform_machine_cycle(const MachineCycle *cycle) {
switch(cycle->operation) {
case BusOperation::ReadOpcode:
case BusOperation::Read:
*cycle->value = memory_[*cycle->address];
break;
case BusOperation::Write:
memory_[*cycle->address] = *cycle->value;
break;
default:
printf("???\n");
break;
}
return 0;
}