mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-10 08:04:45 +00:00
91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
//
|
|
// Status.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 05/10/2023.
|
|
// Copyright © 2023 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef InstructionSets_x86_Status_hpp
|
|
#define InstructionSets_x86_Status_hpp
|
|
|
|
|
|
namespace InstructionSet::x86 {
|
|
|
|
namespace ConditionCode {
|
|
|
|
//
|
|
// Standard flags.
|
|
//
|
|
|
|
static constexpr uint32_t Carry = 1 << 0;
|
|
static constexpr uint32_t Parity = 1 << 2;
|
|
static constexpr uint32_t AuxiliaryCarry = 1 << 4;
|
|
static constexpr uint32_t Zero = 1 << 6;
|
|
static constexpr uint32_t Sign = 1 << 7;
|
|
static constexpr uint32_t Trap = 1 << 8;
|
|
static constexpr uint32_t Interrupt = 1 << 9;
|
|
static constexpr uint32_t Direction = 1 << 10;
|
|
static constexpr uint32_t Overflow = 1 << 11;
|
|
|
|
//
|
|
// 80286+ additions.
|
|
//
|
|
|
|
static constexpr uint32_t IOPrivilege = (1 << 12) | (1 << 13);
|
|
static constexpr uint32_t NestedTask = 1 << 14;
|
|
|
|
//
|
|
// 16-bit protected mode flags.
|
|
//
|
|
|
|
static constexpr uint32_t ProtectionEnable = 1 << 16;
|
|
static constexpr uint32_t MonitorProcessorExtension = 1 << 17;
|
|
static constexpr uint32_t ProcessorExtensionExtension = 1 << 18;
|
|
static constexpr uint32_t TaskSwitch = 1 << 19;
|
|
|
|
//
|
|
// 32-bit protected mode flags.
|
|
//
|
|
|
|
static constexpr uint32_t Resume = 1 << 16;
|
|
static constexpr uint32_t VirtualMode = 1 << 17;
|
|
|
|
}
|
|
|
|
struct Status {
|
|
// Non-zero => set; zero => unset.
|
|
uint32_t carry;
|
|
uint32_t auxiliary_carry;
|
|
uint32_t sign;
|
|
uint32_t overflow;
|
|
|
|
// Zero => set; non-zero => unset.
|
|
uint32_t zero;
|
|
|
|
// Odd number of bits => set; even => unset.
|
|
uint32_t parity;
|
|
|
|
// Convenience getters.
|
|
template <typename IntT> IntT carry_bit() { return carry ? 1 : 0; }
|
|
|
|
void set(uint16_t value) {
|
|
carry = value & ConditionCode::Carry;
|
|
|
|
// TODO: the rest.
|
|
}
|
|
|
|
uint16_t get() const {
|
|
return
|
|
(carry ? ConditionCode::Carry : 0);
|
|
}
|
|
|
|
bool operator ==(const Status &rhs) const {
|
|
return get() == rhs.get();
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* InstructionSets_x86_Status_hpp */
|