forked from BSB-WS23/mpstubs
54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
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#include "machine/gdt.h"
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#include "machine/core.h"
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#include "debug/assert.h"
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#include "debug/output.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) static 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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{ /* base = */ 0x0,
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/* limit = */ 0xFFFFFFFF,
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/* code = */ true,
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/* ring = */ 0,
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/* size = */ SIZE_32BIT },
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// Global data segment von 0-4GB
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{ /* base = */ 0x0,
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/* limit = */ 0xFFFFFFFF,
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/* code = */ false,
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/* ring = */ 0,
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/* size = */ SIZE_32BIT },
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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 Mode](intel_manual_vol3.pdf#page=91)
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alignas(16) static SegmentDescriptor long_mode[] = {
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// Null segment
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{},
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// Global code segment
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{ /* base = */ 0x0,
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/* limit = */ 0x0, // ignored
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/* code = */ true,
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/* ring = */ 0,
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/* size = */ SIZE_64BIT_CODE },
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// Global data segment
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{ /* base = */ 0x0,
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/* limit = */ 0x0, // ignored
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/* code = */ false,
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/* ring = */ 0,
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/* size = */ SIZE_64BIT_DATA },
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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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