高通 watchdog
时间: 2023-08-18 21:11:42 浏览: 38
高通平台上的watchdog分为两种,一种是NON-SECURE WORLD watchdog,由Linux内核控制,另一种是SECURE WORLD watchdog,由TrustZone(TZ)控制。当NON-SECURE WORLD watchdog超时(bark)时,会触发中断并报告给Linux内核,内核认为CPU可能处于hang状态,会在中断处理函数中触发bite操作。而SECURE WORLD watchdog则会在TZ的FIQ处理中,将处于online状态的CPU上下文保存到DDR内存中,并等待SECURE watchdog超时,从而执行crash dump操作。需要注意的是,NON-SECURE watchdog超时不会直接触发PS HOLD操作,而是触发SECURE watchdog超时,最终间接触发PS HOLD操作,执行warm reset操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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