Identifying CPU: Difference between revisions
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(Created page with "==Introduction== Identifying an Intel-compatible x86 CPU is done in several steps : * Check that we have a 32-bits 80386 minimum CPU. * Check the presence of the CPUID instru...") |
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Intel describes the complete process of CPU identification in [http://www.intel.com/content/www/us/en/processors/processor-identification-cpuid-instruction-note.html Application Note 485]. | Intel describes the complete process of CPU identification in [http://www.intel.com/content/www/us/en/processors/processor-identification-cpuid-instruction-note.html Application Note 485]. | ||
AMD describes their specific CPUID implementation [http://support.amd.com/us/Embedded_TechDocs/25481.pdf here] | |||
Revision as of 00:01, 15 August 2012
Introduction
Identifying an Intel-compatible x86 CPU is done in several steps :
- Check that we have a 32-bits 80386 minimum CPU.
- Check the presence of the CPUID instruction.
- If CPUID is supported, use the instruction to get CPU information and supported instructions.
- If CPUID is not supported, reset the CPU to get its signature.
- Calculate the operating frequency of the CPU by timing the execution of a sequence of instructions.
Additional information
Intel describes the complete process of CPU identification in Application Note 485.
AMD describes their specific CPUID implementation here