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The Unabridged Pentium 4 IA32 Processor Genealogy by Bob Colwell, Tom Shanley

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Boot Strap Processor (BSP) Selection

Introduction

Refer to Figure 37-2 on page 885. Upon the deassertion of reset (and the completion of a processor's BIST, if it was started), the processors within the cluster must negotiate amongst themselves to select the processor that will wake up and start fetching, decoding and executing the POST code from ROM memory. This processor is referred to as the Boot Strap Processor, or BSP. After the BSP is selected, the other processors, referred to as the Applications Processors, or APs, remain dormant (in the halt state) until they receive a startup interrupt message from the BSP. The following section provides a detailed description of the BSP selection process. For a detailed discussion of the APIC, refer ...

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