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请教:1、集成ARM TrustZone内核的CPU/SOC,是否可由外部SE(单片机小系统)硬件信号优先控制保持TEE状态,不切换回REE?即:当REE切换到TEE后,外部SE(单片机小系统)输出控制信号,保持TEE状态,不切换回REE,只有当SE释放此控制信号,TEE才能自主切换回REE。2、ARM TrustZone内核硬件上能支持这样设计吗?谢谢。
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请教:1、集成ARM TrustZone内核的CPU/SOC,是否可由外部SE(单片机小系统)硬件信号优先控制保持TEE状态,不切换回REE?即:当REE切换到TEE后,外部SE(单片机小系统)输出控制信号,保持TEE状态,不切换回REE,只有当SE释放此控制信号,TEE才能自主切换回REE。2、ARM TrustZone内核硬件上能支持这样设计吗?谢谢。
MTS
over 7 years ago
同上
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Ethan Zhang
over 7 years ago
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Hi MTS, 如果你想在TEE状态下,你直接把非安全的中断屏蔽掉,就可以一直在TEE状态下了,例如很多trusted OS的block operation就是这样实现的;如果你需要从TEE切回到REE状态下可以调用SMC或者把中断打开,如果你的SCR寄存器配置合理的话,例如非安全的timer产生中断后,就会切换到REE状态。 如果你一定要使用外部SE的话,那么SE也可以产生中断,要看你的Trusted...
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Song Bin 宋斌
over 7 years ago
in reply to
Ethan Zhang
多谢Ethan帮忙回复 :)
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Song Bin 宋斌
over 7 years ago
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Ethan Zhang
多谢Ethan帮忙回复 :)
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