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authorAndreas Sandberg <andreas.sandberg@arm.com>2015-05-23 13:46:53 +0100
committerAndreas Sandberg <andreas.sandberg@arm.com>2015-05-23 13:46:53 +0100
commit2278fec1d1064ec1622098153b20a773fb688e78 (patch)
treefcb7441fb487261ba3e9465fa30ad856e286f7ca /src/arch/arm/freebsd
parent65f3f097d3c270d2f28fc7d55651afaefb56ceed (diff)
downloadgem5-2278fec1d1064ec1622098153b20a773fb688e78.tar.xz
dev, arm: Add virtual timers to the generic timer model
The generic timer model currently does not support virtual counters. Virtual and physical counters both tick with the same frequency. However, virtual timers allow a hypervisor to set an offset that is subtracted from the counter when it is read. This enables the hypervisor to present a time base that ticks with virtual time in the VM (i.e., doesn't tick when the VM isn't running). Modern Linux kernels generally assume that virtual counters exist and try to use them by default.
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