2da8d8bfc0
At present, non-secure timer register contents are saved and restored as part of world switch by BL3-1. This effectively means that the non-secure timer stops, and non-secure timer interrupts are prevented from asserting until BL3-1 switches back, introducing latency for non-secure services. Often, secure world might depend on alternate sources for secure interrupts (secure timer or platform timer) instead of non-secure timers, in which case this save and restore is unnecessary. This patch introduces a boolean build-time configuration NS_TIMER_SWITCH to choose whether or not to save and restore non-secure timer registers upon world switch. The default choice is made not to save and restore them. Fixes ARM-software/tf-issues#148 Change-Id: I1b9d623606acb9797c3e0b02fb5ec7c0a414f37e |
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