#include "gdt.h"

#include "core.h"
#include "tss.h"

TSS::Entry mytss;

namespace GDT {

// The static 32-bit Global Descriptor Table (GDT)
alignas(16) constinit SegmentDescriptor protected_mode[] = {
	// Null descriptor
	{},

	// Global code segment von 0-4GB
	SegmentDescriptor::Segment(0, UINT32_MAX, true, 0, Size::Bit32),

	// Global data segment von 0-4GB
	SegmentDescriptor::Segment(0, UINT32_MAX, false, 0, Size::Bit32),
};
extern "C" constexpr Pointer gdt_protected_mode_pointer(protected_mode);

// The static 64-bit Global Descriptor Table (GDT)
// \see [ISDMv3 3.2.4 Segmentation in IA-32e
// Mode](intel_manual_vol3.pdf#page=91)
alignas(16) constinit SegmentDescriptor long_mode[] = {
	// Null descriptor
	SegmentDescriptor::Null(),

	// Global code segment
	SegmentDescriptor::Segment64(true, 0),

	// Global data segment
	SegmentDescriptor::Segment64(false, 0),

	SegmentDescriptor::Segment64(true , 3),
	SegmentDescriptor::Segment64(false, 3),

	SegmentDescriptor::TSSLow(mytss),
	SegmentDescriptor::TSSHigh(mytss),
};
extern "C" constexpr Pointer gdt_long_mode_pointer(long_mode);

}  // namespace GDT