43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
#include "gdt.h"
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#include "core.h"
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#include "tss.h"
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namespace GDT {
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// The static 32-bit Global Descriptor Table (GDT)
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alignas(16) constinit SegmentDescriptor protected_mode[] = {
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// Null descriptor
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{},
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// Global code segment von 0-4GB
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SegmentDescriptor::Segment(0, UINT32_MAX, true, 0, Size::Bit32),
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// Global data segment von 0-4GB
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SegmentDescriptor::Segment(0, UINT32_MAX, false, 0, Size::Bit32),
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};
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extern "C" constexpr Pointer gdt_protected_mode_pointer(protected_mode);
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// The static 64-bit Global Descriptor Table (GDT)
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// \see [ISDMv3 3.2.4 Segmentation in IA-32e
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// Mode](intel_manual_vol3.pdf#page=91)
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alignas(16) SegmentDescriptor long_mode[] = {
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// Null descriptor
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SegmentDescriptor::Null(),
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// Global code segment
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SegmentDescriptor::Segment64(true, 0),
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// Global data segment
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SegmentDescriptor::Segment64(false, 0),
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SegmentDescriptor::Segment64(true , 3),
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SegmentDescriptor::Segment64(false, 3),
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SegmentDescriptor::TSSLow(mytss),
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SegmentDescriptor::TSSHigh(mytss),
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};
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extern "C" constexpr Pointer gdt_long_mode_pointer(long_mode);
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} // namespace GDT
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