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78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
//
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// Perform.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 05/10/2023.
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// Copyright © 2023 Thomas Harte. All rights reserved.
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//
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#ifndef Perform_h
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#define Perform_h
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#include "Instruction.hpp"
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#include "Model.hpp"
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#include "Flags.hpp"
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namespace InstructionSet::x86 {
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/// Explains the type of access that `perform` intends to perform; is provided as a template parameter to whatever
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/// the caller supplies as `MemoryT` and `RegistersT` when obtaining a reference to whatever the processor
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/// intends to reference.
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///
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/// `perform` guarantees to validate all accesses before modifying any state, giving the caller opportunity to generate
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/// any exceptions that might be applicable.
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enum class AccessType {
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/// The requested value will be read from.
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Read,
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/// The requested value will be written to.
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Write,
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/// The requested value will be read from and then written to.
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ReadModifyWrite,
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/// The requested value has already been authorised for whatever form of access is now intended, so there's no
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/// need further to inspect. This is done e.g. by operations that will push multiple values to the stack to verify that
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/// all necessary stack space is available ahead of pushing anything, though each individual push will then result in
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/// a further `Preauthorised` access.
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PreauthorisedRead,
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PreauthorisedWrite,
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};
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template <
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Model model_,
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typename FlowControllerT,
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typename RegistersT,
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typename MemoryT,
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typename IOT
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> struct ExecutionContext {
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FlowControllerT flow_controller;
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Flags flags;
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RegistersT registers;
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MemoryT memory;
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IOT io;
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static constexpr Model model = model_;
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};
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/// Performs @c instruction querying @c registers and/or @c memory as required, using @c io for port input/output,
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/// and providing any flow control effects to @c flow_controller.
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///
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/// Any change in processor status will be applied to @c status.
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template <
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typename InstructionT,
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typename ContextT
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> void perform(
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const InstructionT &instruction,
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ContextT &context
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);
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template <
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typename ContextT
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> void interrupt(
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int index,
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ContextT &context
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);
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}
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#include "Implementation/PerformImplementation.hpp"
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#endif /* Perform_h */
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