| 摘要 |
A multiprocessor computer system determines that the hard reset designated BSP has failed by examining its status bits. The designated BSP then selects a processor from among the APs that will take the place of the designated BSP. The selection is accomplished by, successively for every AP indicated to be good by examining its corresponding status flag, determining whether the AP is present, starting up the AP if it is present, determining whether the AP has passed its BIST, and selecting the AP to take the place of the designated BSP if the AP has passed its BIST. The BSP then designates the selected AP as the BSP instead of itself. The bootstrap indicator bit of the selected AP is set to indicate that the AP is the BSP. The bootstrap indicator bit of the designated BSP is cleared. The computer system then undergoes a soft reset which causes the selected AP to become the BSP and begin running the BIOS code from the reset vector.
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