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82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
//
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// Status.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 InstructionSets_x86_Status_hpp
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#define InstructionSets_x86_Status_hpp
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namespace InstructionSet::x86 {
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namespace ConditionCode {
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//
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// Standard flags.
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//
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static constexpr uint32_t Carry = 1 << 0;
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static constexpr uint32_t Parity = 1 << 2;
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static constexpr uint32_t AuxiliaryCarry = 1 << 4;
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static constexpr uint32_t Zero = 1 << 6;
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static constexpr uint32_t Sign = 1 << 7;
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static constexpr uint32_t Trap = 1 << 8;
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static constexpr uint32_t Interrupt = 1 << 9;
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static constexpr uint32_t Direction = 1 << 10;
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static constexpr uint32_t Overflow = 1 << 11;
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//
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// 80286+ additions.
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//
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static constexpr uint32_t IOPrivilege = (1 << 12) | (1 << 13);
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static constexpr uint32_t NestedTask = 1 << 14;
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//
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// 16-bit protected mode flags.
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//
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static constexpr uint32_t ProtectionEnable = 1 << 16;
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static constexpr uint32_t MonitorProcessorExtension = 1 << 17;
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static constexpr uint32_t ProcessorExtensionExtension = 1 << 18;
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static constexpr uint32_t TaskSwitch = 1 << 19;
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//
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// 32-bit protected mode flags.
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//
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static constexpr uint32_t Resume = 1 << 16;
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static constexpr uint32_t VirtualMode = 1 << 17;
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}
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struct Status {
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// Non-zero => set; zero => unset.
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uint32_t carry;
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uint32_t auxiliary_carry;
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uint32_t sign;
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uint32_t overflow;
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// Zero => set; non-zero => unset.
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uint32_t zero;
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// Odd number of bits => set; even => unset.
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uint32_t parity;
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// Convenience getters.
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template <typename IntT> IntT carry_bit() { return carry ? 1 : 0; }
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void set(uint16_t value) {
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carry = value & ConditionCode::Carry;
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// TODO: the rest.
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}
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};
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}
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#endif /* InstructionSets_x86_Status_hpp */
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