From b78be240cf1c1269ed83548bf71095193487ca33 Mon Sep 17 00:00:00 2001 From: Ali Saidi Date: Thu, 17 Mar 2011 19:20:20 -0500 Subject: ARM: Detect and skip udelay() functions in linux kernel. This change speeds up booting, especially in MP cases, by not executing udelay() on the core but instead skipping ahead tha amount of time that is being delayed. --- src/cpu/simple/atomic.cc | 3 +++ src/cpu/simple/timing.cc | 4 ++++ 2 files changed, 7 insertions(+) (limited to 'src/cpu') diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc index 27635d3ce..6aa0eb64e 100644 --- a/src/cpu/simple/atomic.cc +++ b/src/cpu/simple/atomic.cc @@ -641,6 +641,9 @@ AtomicSimpleCPU::tick() checkForInterrupts(); checkPcEventQueue(); + // We must have just got suspended by a PC event + if (_status == Idle) + return; Fault fault = NoFault; diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc index 632e83356..aca48e5d4 100644 --- a/src/cpu/simple/timing.cc +++ b/src/cpu/simple/timing.cc @@ -714,6 +714,10 @@ TimingSimpleCPU::fetch() checkPcEventQueue(); + // We must have just got suspended by a PC event + if (_status == Idle) + return; + TheISA::PCState pcState = thread->pcState(); bool needToFetch = !isRomMicroPC(pcState.microPC()) && !curMacroStaticInst; -- cgit v1.2.3