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54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
//
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// 68000Implementation.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 10/03/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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template <class T, bool dtack_is_implicit> void Processor<T, dtack_is_implicit>::run_for(HalfCycles duration) {
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// TODO: obey the 'cycles' count.
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while(true) {
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// Check whether the program is exhausted.
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if(active_program_->action == Step::Action::ScheduleNextProgram) {
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std::cerr << "68000 Abilities exhausted" << std::endl;
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return;
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}
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// The program is not exhausted, so perform the microcycle.
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// Check for DTack if this isn't being treated implicitly.
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if(!dtack_is_implicit) {
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if(active_program_->microcycle.operation & (Microcycle::UpperData | Microcycle::LowerData) && !dtack_) {
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// TODO: perform wait state.
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continue;
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}
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}
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// TODO: synchronous bus.
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// Perform the microcycle.
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bus_handler_.perform_bus_operation(active_program_->microcycle, is_supervisor_);
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// Perform the post-hoc action.
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switch(active_program_->action) {
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default:
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std::cerr << "Unimplemented 68000 action: " << int(active_program_->action) << std::endl;
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return;
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break;
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case Step::Action::None: break;
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case Step::Action::IncrementEffectiveAddress: effective_address_ += 2; break;
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case Step::Action::IncrementProgramCounter: program_counter_.full += 2; break;
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case Step::Action::AdvancePrefetch:
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prefetch_queue_[0] = prefetch_queue_[1];
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break;
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}
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// Move to the next program step.
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++active_program_;
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}
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}
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