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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| #pragma once | ||
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| #include <utils/bitfields.hpp> | ||
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| namespace Beelzebub { namespace System | ||
| { | ||
| enum class IdtGateType : uint8_t | ||
| { | ||
| Unused0 = 0, | ||
| Unused1 = 1, | ||
| Unused2 = 2, | ||
| Unused3 = 3, | ||
| Unused4 = 4, | ||
| TaskGate = 5, | ||
| InterruptGate16 = 6, | ||
| TrapGate16 = 7, | ||
| Reserved1 = 8, | ||
| TssAvailable = 9, | ||
| Reserved2 = 10, | ||
| TssBusy = 11, | ||
| CallGate = 12, | ||
| Reserved3 = 13, | ||
| InterruptGate = 14, | ||
| TrapGate = 15, | ||
| }; | ||
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| /** | ||
| * <summary>Represents an 8-byte entry in the GDT.</summary> | ||
| */ | ||
| union IdtGate | ||
| { | ||
| /* This is implemented as a union for layout optimization... | ||
| * x86 supports unaligned access, which is used to cheat the Offset. | ||
| * | ||
| * Bit structure: | ||
| * 0 - 15 : Offset low | ||
| * 16 - 31 : Segment Selector | ||
| * 32 - 34 : Interrupt Stack Table | ||
| * 35 : Zero | ||
| * 36 : Zero | ||
| * 37 - 39 : Zeros | ||
| * 40 - 43 : Type | ||
| * 44 : Zero | ||
| * 45 - 46 : DPL | ||
| * 47 : Present | ||
| * 48 - 63 : Offset middle | ||
| * 64 - 95 : Offset high | ||
| * 96 - 127 : Reserved | ||
| */ | ||
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| /* Properties */ | ||
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| BITFIELD_FLAG_RW(45, DplLow , uint64_t, this->Low, __bland, const, static) | ||
| BITFIELD_FLAG_RW(46, DplHigh, uint64_t, this->Low, __bland, const, static) | ||
| BITFIELD_FLAG_RW(47, Present, uint64_t, this->Low, __bland, const, static) | ||
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| BITFIELD_STRO_RW(32, 3, uint8_t , Ist , uint64_t, this->Value, __bland, const, static) | ||
| BITFIELD_STRO_RW(40, 4, IdtGateType, Type, uint64_t, this->Value, __bland, const, static) | ||
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| /* Constructors */ | ||
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| /** | ||
| * <summary>Creates a null IDT Entry.</summary> | ||
| */ | ||
| __bland inline constexpr IdtGate() | ||
| : Low(0), High(0) | ||
| { | ||
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| } | ||
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| /** | ||
| * <summary>Creates a new IDT Entry structure from the given raw values.</summary> | ||
| */ | ||
| __bland inline explicit constexpr IdtGate(uint64_t const low, uint64_t const high) | ||
| : Low(low), High(high) | ||
| { | ||
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| } | ||
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| /* Properties */ | ||
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| static __bland inline uintptr_t GetOffset() const | ||
| { | ||
| return (uintptr_t)this->OffsetLow | (this->OffsetHigh & 0xFFFFFFFFFFFF0000); | ||
| } | ||
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| static __bland inline auto SetOffset(const uintptr_t val) | ||
| { | ||
| this->OffsetLow = val & 0x000000000000FFFF; | ||
| this->OffsetHigh = (val & 0xFFFFFFFFFFFF0000) | ||
| | (this->OffsetHigh & 0x000000000000FFFF); | ||
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| // Simple and elegant. | ||
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| return *this; | ||
| } | ||
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| static __bland inline uint16_t GetSegment() const | ||
| { | ||
| return this->Segment; | ||
| } | ||
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| static __bland inline auto SetSegment(const uint16_t val) | ||
| { | ||
| this->Segment = val; | ||
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| return *this; | ||
| } | ||
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| /* Field(s) */ | ||
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| struct | ||
| { | ||
| uint64_t Low; | ||
| uint64_t High; | ||
| } __packed; | ||
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| struct | ||
| { | ||
| uint16_t OffsetLow; | ||
| uint16_t Segment; | ||
| uint64_t OffsetHigh; // The lower word will be discarded. | ||
| uint32_t Reserved0; | ||
| } __packed; | ||
| }; | ||
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| class Idt | ||
| { | ||
| public: | ||
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| /* Constructor(s) */ | ||
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| Idt() = default; | ||
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| Idt(Idt const &) = delete; | ||
| Idt & operator =(Idt const &) = delete; | ||
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| /* Field(s) */ | ||
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| IdtGate Entries[256]; | ||
| }; | ||
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| /** | ||
| * <summary>Structure of the GDTR.</summary> | ||
| */ | ||
| struct IdtRegister | ||
| { | ||
| /* Field(s) */ | ||
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| uint16_t Size; | ||
| Idt * Pointer; | ||
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| /* Load & Store */ | ||
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| __bland inline void Activate() | ||
| { | ||
| asm volatile ( "lidt (%[ptr]) \n\t" : : [ptr]"r"(this) ); | ||
| } | ||
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| static __bland inline IdtRegister Retrieve() | ||
| { | ||
| IdtRegister res; | ||
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| asm volatile ( "sidt %[ptr] \n\t" : : [ptr]"m"(res) ); | ||
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| return res; | ||
| } | ||
| } __packed; | ||
| }} |
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