bool IOMapper::start(IOService *provider)
{
OSObject * obj;
if (!super::start(provider))
return false;
if (!initHardware(provider))
return false;
fPageSize = getPageSize();
if (fIsSystem) {
sMapperLock.lock();
IOMapper::gSystem = this;
sMapperLock.wakeup(&IOMapper::gSystem);
sMapperLock.unlock();
}
if (provider)
{
obj = provider->getProperty("iommu-id");
if (!obj)
obj = provider->getProperty("AAPL,phandle");
if (obj)
setProperty(gIOMapperIDKey, obj);
}
return true;
}
void IOMapper::waitForSystemMapper()
{
sMapperLock.lock();
while ((uintptr_t) IOMapper::gSystem & kWaitMask)
sMapperLock.sleep(&IOMapper::gSystem);
sMapperLock.unlock();
}
void IOMapper::waitForSystemMapper()
{
sMapperLock.lock();
while ((uintptr_t) IOMapper::gSystem & kWaitMask)
{
OSReportWithBacktrace("waitForSystemMapper");
sMapperLock.sleep(&IOMapper::gSystem);
}
sMapperLock.unlock();
}
void IOMapper::setMapperRequired(bool hasMapper)
{
if (hasMapper)
IOMapper::gSystem = (IOMapper *) kHasMapper;
else {
sMapperLock.lock();
IOMapper::gSystem = (IOMapper *) kNoMapper;
sMapperLock.unlock();
sMapperLock.wakeup(&IOMapper::gSystem);
}
}
