diff options
Diffstat (limited to 'src/arch/arm')
| -rw-r--r-- | src/arch/arm/locked_mem.hh | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/arch/arm/locked_mem.hh b/src/arch/arm/locked_mem.hh index 8aa181245..2fcbc4a92 100644 --- a/src/arch/arm/locked_mem.hh +++ b/src/arch/arm/locked_mem.hh @@ -1,5 +1,5 @@ /* - * Copyright (c) 2012-2013 ARM Limited + * Copyright (c) 2012-2013,2017 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -148,6 +148,20 @@ handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask) return true; } +template <class XC> +inline void +globalClearExclusive(XC *xc) +{ + // A spinlock would typically include a Wait For Event (WFE) to + // conserve energy. The ARMv8 architecture specifies that an event + // is automatically generated when clearing the exclusive monitor + // to wake up the processor in WFE. + DPRINTF(LLSC,"Clearing lock and signaling sev\n"); + xc->setMiscReg(MISCREG_LOCKFLAG, false); + // Implement ARMv8 WFE/SEV semantics + xc->setMiscReg(MISCREG_SEV_MAILBOX, true); + xc->getCpuPtr()->wakeup(xc->threadId()); +} } // namespace ArmISA |