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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/>.
*/
#include "Idt.h"
uint64 MngIdt::idt[MngIdt::size];
bool MngIdt::isInitialize = false;
bool MngIdt::idtLoaded = false;
MngIdt mngIdt;
DescInterrupt32::DescInterrupt32(uint32 offset, uint16 selector, uint8 attr)
{
uint8 gateType = attr & 0x0f;
if((gateType == TSK_GATE and offset != 0)
or gateType < TSK_GATE
or (gateType > TRAP_GATE_16 and gateType < INT_GATE_32)
or gateType > TRAP_GATE_32
or !(attr & PRESENT_BIT))
{
offsetLow = 0;
offsetHight = 0;
segmentSelector = 0;
attributes = 0;
}
else
{
offsetLow = offset & 0xffff;
offsetHight = (offset & 0xffff0000) >> 16;
segmentSelector = selector;
attributes = attr;
}
};
uint64 DescInterrupt32::getDescriptor() const
{
uint64 desc = 0;
desc |= offsetLow;
desc |= (uint32)segmentSelector << 16;
desc |= (uint64)attributes << 40;
desc |= (uint64)offsetHight << 48;
return desc;
};
uint32 DescInterrupt32::getOffset() const
{
return offsetLow | offsetHight << 16;
};
DescInterrupt32 DescInterrupt32::InterruptKernelLong(uint32 offset, uint16 selector)
{
return DescInterrupt32(
offset,
selector,
PRESENT_BIT | RING_KERN | INT_GATE_32
);
};
DescInterrupt32 DescInterrupt32::TrapKernelLong(uint32 offset, uint16 selector)
{
return DescInterrupt32(
offset,
selector,
PRESENT_BIT | RING_KERN | TRAP_GATE_32
);
};
DescInterrupt32 DescInterrupt32::TaskKernel(uint16 selector)
{
return DescInterrupt32(
NULL,
selector,
PRESENT_BIT | RING_KERN | TSK_GATE
);
};
bool MngIdt::isIntReserved(uint8 interrupt)
{
for(uint8 indx = 0; indx < reservedIntSize; indx++)
{
if(reservedInts[indx] == interrupt) return true;
}
return false;
};
MngIdt::MngIdt()
{
if(!isInitialize)
{
MemoryOperations::set(idt, 0, sizeof(uint64) * size);
currIdx = NULL;
idtLoaded = false;
isInitialize = true;
irqInterruptStart = firstSystemIntNumber;
}
};
bool MngIdt::canDescriptorWrite(uint8 idx)
{
if(idt[idx] or idtLoaded) return false;
else return true;
};
bool MngIdt::addDescriptor(DescInterrupt32 desc)
{
uint64 descqw = desc.getDescriptor();
if(!canDescriptorWrite(currIdx) or isIntReserved(currIdx)
or desc.getOffset() == NULL) return false;
idt[currIdx] = descqw;
uint8 attributes = descqw >> 40;
if((attributes & RING_DRIVERSH or
attributes & RING_DRIVERSL) and
(irqInterruptStart == firstSystemIntNumber))
{
irqInterruptStart = (uint8)(descqw >> 16);
}
while(isIntReserved(++currIdx));
return true;
};
bool MngIdt::setDescriptor(DescInterrupt32 desc, uint8 idx)
{
if(!canDescriptorWrite(idx)) return false;
idt[idx] = desc.getDescriptor();
return true;
};
bool MngIdt::loadIdt()
{
if(idtLoaded) return false;
//Set descriptor
uint64 descriptor = 0;
uint16 size = sizeof(uint64) * this->size - 1;
uint32 offset = (uint32)(&idt);
descriptor |= offset;
descriptor <<= 16;
descriptor |= size;
// Load descriptor in LDTR
asm ("lidt %0" :: "m"(descriptor));
idtLoaded = true;
return true;
};
// Get static instance of MngIdt initialized once
MngIdt &MngIdt::getInstance()
{
if(!isInitialize) mngIdt = MngIdt();
return mngIdt;
};
void DescInterrupt32::setOffset(uint32 offset)
{
uint8 gateType = attributes & 0x0f;
if(!(gateType == TSK_GATE and offset != 0))
{
offsetLow = offset & 0xffff;
offsetHight = (offset & 0xffff0000) >> 16;
}
};
void DescInterrupt32::setGateType(uint8 gateType)
{
if(gateType < TSK_GATE
or (gateType > TRAP_GATE_16 and gateType < INT_GATE_32)
or gateType > TRAP_GATE_32
) return;
else if(gateType == TSK_GATE)
{
offsetLow = offsetHight = 0;
}
attributes &= 0xfff0;
attributes |= (gateType & 0x0f);
};
void DescInterrupt32::setDpl(uint8 dpl)
{
attributes = (dpl & 0x03) << 5;
};
bool MngIdt::isInterruptSet(uint8 numberInterrupt)
{
return idt[numberInterrupt];
};
uint8 MngIdt::getIrqInterruptStart()
{
return irqInterruptStart;
};
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