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https://github.com/Fennix-Project/Kernel.git
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42 lines
597 B
NASM
42 lines
597 B
NASM
[bits 32]
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section .bootstrap.text
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global DetectCPUID
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DetectCPUID:
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pushfd
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pop eax
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mov ecx, eax
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xor eax, 1 << 21
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push eax
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popfd
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pushfd
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pop eax
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push ecx
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popfd
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xor eax, ecx
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jz .NoCPUID
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ret
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.NoCPUID:
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mov word [0xb8F00], 0xF00F ; .
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.Loop:
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cli
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hlt
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jmp .Loop
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global Detect64Bit
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Detect64Bit:
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000001
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jb .NoLongMode
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mov eax, 0x80000001
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cpuid
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test edx, 1 << 29
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jz .NoLongMode
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ret
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.NoLongMode:
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mov word [0xb8F00], 0xF00A ; .
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.Loop:
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cli
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hlt
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jmp .Loop
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