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#include "Gdt.h"
uint64 MngGdt::gdt[MngGdt::size];
DescSeg32::DescSeg32(uint32 base, uint32 limit, uint8 access, uint8 flags)
{
this->baseLow = base & 0x0000FFFF;
this->baseMiddle = (base & 0x00FF0000) >> 16;
this->baseHight = (base & 0xFF000000) >> 24;
this->limitLow = limit & 0x0000FFFF;
this->limitMiddle = (limit & 0x000F0000) >> 16;
this->access = access;
this->flags = flags & 0x000E;
};
uint64 DescSeg32::getDescriptor()
{
uint64 descriptor = 0;
descriptor |= (uint64)limitLow;
descriptor |= (uint64)baseLow << 16;
descriptor |= (uint64)baseMiddle << 32;
descriptor |= (uint64)access << 40;
descriptor |= (uint64)limitMiddle << 48;
descriptor |= (uint64)flags << 52;
descriptor |= (uint64)baseHight << 56;
return descriptor;
};
uint64 DescSeg32::flatCodeKernel()
{
return DescSeg32(0, 0xFFFFF, CODE_ER | PRESENT | NSYSTEMSEG
, PAGEGRAN | HIGHSIZE).getDescriptor();
};
uint64 DescSeg32::flatDataKernel()
{
return DescSeg32(0, 0xFFFFF, DATA_RW | PRESENT | NSYSTEMSEG
, PAGEGRAN | HIGHSIZE).getDescriptor();
}
uint64 DescSeg32::flatCodeUser()
{
return DescSeg32(0, 0xFFFFF, CODE_ER | PRESENT | NSYSTEMSEG | USER
, PAGEGRAN | HIGHSIZE).getDescriptor();
};
uint64 DescSeg32::flatDataUser()
{
return DescSeg32(0, 0xFFFFF, DATA_RW | PRESENT | NSYSTEMSEG | USER
, PAGEGRAN | HIGHSIZE).getDescriptor();
};
MngGdt::MngGdt()
{
gdt[0] = 0;
currIdx = 1;
isGdtLoaded = 0;
};
bool MngGdt::addDescriptor(uint64 desc)
{
if(currIdx >= size || currIdx == 0)
{
return false;
}
this->gdt[currIdx++] = desc;
return true;
};
bool MngGdt::loadGdt()
{
if(isGdtLoaded)
{
return false;
}
uint64 pointer = 0;
uint16 size = sizeof(uint64) * this->size - 1;
uint32 offset = (uint32)((void *)(&gdt));
pointer |= offset;
pointer <<= 16;
pointer |= size;
SWITCHTOGDT(pointer);
isGdtLoaded = 1;
return true;
};
bool MngGdt::getIsGdtLoaded()
{
return isGdtLoaded;
};
void MngGdt::operator=(const MngGdt& src)
{
if(this->isGdtLoaded == 1 || src.isGdtLoaded == 1)
{
return;
}
// Fix it. Write method to copy from ... to ...
for(int i = 0; i < this->size; i++) this->gdt[i] = src.gdt[i];
this->isGdtLoaded = src.isGdtLoaded;
this->currIdx = src.currIdx;
};
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