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/* -------------------------------------------
Copyright Mahrouss Logic
------------------------------------------- */
#include <ArchKit/ArchKit.hpp>
namespace NewOS::HAL {
namespace Detail {
STATIC RegisterGDT kRegGdt;
STATIC HAL::Register64 kRegIdt;
STATIC ::NewOS::Detail::AMD64::InterruptDescriptorAMD64
kInterruptVectorTable[kKernelIdtSize];
STATIC Void RemapPIC(Void) noexcept {
// Remap PIC.
HAL::Out8(0x20, 0x10 | 0x01);
HAL::Out8(0xA0, 0x10 | 0x01);
HAL::Out8(0x21, 32);
HAL::Out8(0xA1, 40);
HAL::Out8(0x21, 4);
HAL::Out8(0xA1, 2);
HAL::Out8(0x21, 0x01);
HAL::Out8(0xA1, 0x01);
HAL::Out8(0x21, 0x00);
HAL::Out8(0xA1, 0x00);
}
} // namespace Detail
/// @brief Loads the provided Global Descriptor Table.
/// @param gdt
/// @return
Void GDTLoader::Load(RegisterGDT &gdt) {
MUST_PASS(gdt.Base != 0);
Detail::kRegGdt.Base = gdt.Base;
Detail::kRegGdt.Limit = gdt.Limit;
hal_load_gdt(Detail::kRegGdt);
}
Void IDTLoader::Load(Register64 &idt) {
volatile ::NewOS::UIntPtr **baseIdt = (volatile ::NewOS::UIntPtr **)idt.Base;
MUST_PASS(baseIdt);
Detail::RemapPIC();
for (UInt16 i = 0; i < kKernelIdtSize; ++i) {
MUST_PASS(baseIdt[i]);
Detail::kInterruptVectorTable[i].Selector = kGdtCodeSelector;
Detail::kInterruptVectorTable[i].Ist = 0x0;
Detail::kInterruptVectorTable[i].TypeAttributes = kInterruptGate;
Detail::kInterruptVectorTable[i].OffsetLow = ((UIntPtr)baseIdt[i] & 0xFFFF);
Detail::kInterruptVectorTable[i].OffsetMid = (((UIntPtr)baseIdt[i] >> 16) & 0xFFFF);
Detail::kInterruptVectorTable[i].OffsetHigh =
(((UIntPtr)baseIdt[i] >> 32) & 0xFFFFFFFF);
Detail::kInterruptVectorTable[i].Zero = 0x0;
}
Detail::kRegIdt.Base = reinterpret_cast<UIntPtr>(Detail::kInterruptVectorTable);
Detail::kRegIdt.Limit = sizeof(::NewOS::Detail::AMD64::InterruptDescriptorAMD64) *
(kKernelIdtSize - 1);
hal_load_idt(Detail::kRegIdt);
}
void GDTLoader::Load(Ref<RegisterGDT> &gdt) { GDTLoader::Load(gdt.Leak()); }
void IDTLoader::Load(Ref<Register64> &idt) { IDTLoader::Load(idt.Leak()); }
} // namespace NewOS::HAL
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