Symmetric Multiprocessing - OSDev Wiki
Aug 11, 2021 · For a init IPI or startup IPI, you must first write the target LAPIC ID into bits 24-27 of base + 0x310. Then, for an init IPI, write 0x00004500 to base + 0x300. For a SIPI, write 0x00004600, ored with the page number at which you want to AP to start executing, to base + 0x300. For more information, see http://wiki.osdev.org/APIC#Local_APIC_registers.
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