47 lines
914 B
NASM
47 lines
914 B
NASM
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.global get_cpu_brand_string
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.type get_cpu_brand_string, @function
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get_cpu_brand_string:
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pushad # Save all general-purpose registers
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mov ebx, eax # Save buffer pointer to ebx
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000004 # Check if brand string is supported
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jb .not_supported
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mov esi, ebx # Copy address to ESI
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mov eax, 0x80000002
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cpuid
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mov [esi], eax
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mov [esi + 4], ebx
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mov [esi + 8], ecx
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mov [esi + 12], edx
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mov eax, 0x80000003
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cpuid
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mov [esi + 16], eax
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mov [esi + 20], ebx
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mov [esi + 24], ecx
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mov [esi + 28], edx
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mov eax, 0x80000004
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cpuid
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mov [esi + 32], eax
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mov [esi + 36], ebx
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mov [esi + 40], ecx
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mov [esi + 44], edx
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jmp .done
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.not_supported:
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mov byte [ebx], 0 # Null-terminate if not supported
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.done:
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popad
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ret
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