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/**
* Copyright (c) 2026 Alexey Gavrilov <alexey.gavrilov@mail.com>
*
* This file is part of ObjectiveOS.
*
* ObjectiveOS is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* ObjectiveOS is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* ObjectiveOS. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef IDT_H
#define IDT_H
#include "../gdt/Gdt.h"
#include <MemoryOperations.h>
// Defines
// Attributes
#define TSK_GATE 0x5
#define INT_GATE_16 0x6
#define TRAP_GATE_16 0x7
#define INT_GATE_32 0xe
#define TRAP_GATE_32 0xf
#define PRESENT_BIT 0x80
#define RING_KERN 0
#define RING_DRIVERSH 0x20
#define RING_DRIVERSL 0x40
#define RING_APP 0x60
//--------
class DescInterrupt32
{
private:
uint16 offsetLow;
uint16 segmentSelector;
uint8 attributes;
uint16 offsetHight;
public:
DescInterrupt32() = default;
DescInterrupt32(const DescInterrupt32 &) = default;
DescInterrupt32(uint32 offset, uint16 selector, uint8 attr);
void setOffset(uint32 offset);
void setGateType(uint8 gateType);
void setDpl(uint8 dpl);
uint64 getDescriptor() const;
uint32 getOffset() const;
static DescInterrupt32 InterruptKernelLong(uint32 offset,
uint16 selector);
static DescInterrupt32 TrapKernelLong(uint32 offset,
uint16 selector);
static DescInterrupt32 TaskKernel(uint16 selector);
};
class MngIdt
{
private:
const static uint8 reservedIntSize = 12;
constexpr static uint8 reservedInts[reservedIntSize] =
{
9, 15, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
};
// If false interrupt number isn't reserved, true - reserved
bool isIntReserved(uint8 interrupt);
const static uint8 size = 255;
static uint64 idt[size];
static bool isInitialize;
static bool idtLoaded;
uint8 currIdx;
// Start number of interrupts that service IRQ
// Accpet this number as first interrupt descriptor
// with dpl = 2 or 3 (drivers)
uint8 irqInterruptStart;
public:
const static uint8 firstSystemIntNumber = 0x20;
MngIdt();
MngIdt(const MngIdt &) = delete;
bool addDescriptor(DescInterrupt32 desc);
bool setDescriptor(DescInterrupt32 desc, uint8 idx);
bool canDescriptorWrite(uint8 idx);
bool loadIdt();
static MngIdt &getInstance();
uint8 getIrqInterruptStart();
bool isInterruptSet(uint8 numberInterrupt);
};
extern MngIdt mngIdt;
#endif
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