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Update to build with 10.8 OS X Frameworks. This is a Mac only change.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14016 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
andrewfish 2012-12-22 00:47:17 +00:00
parent 171bb2e53c
commit 5b484a25f7
1 changed files with 14 additions and 6 deletions
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20
EmulatorPkg/Unix/Host/EmuThunk.c
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@ -259,18 +259,26 @@ QueryPerformanceCounter (
{
#if __APPLE__
UINT64 Start;
Nanoseconds elapsedNano;
static mach_timebase_info_data_t sTimebaseInfo;
Start = mach_absolute_time ();
// Convert to nanoseconds.
// Have to do some pointer fun because AbsoluteToNanoseconds
// works in terms of UnsignedWide, which is a structure rather
// than a proper 64-bit integer.
elapsedNano = AbsoluteToNanoseconds (*(AbsoluteTime *) &Start);
// If this is the first time we've run, get the timebase.
// We can use denom == 0 to indicate that sTimebaseInfo is
// uninitialised because it makes no sense to have a zero
// denominator is a fraction.
return *(uint64_t *) &elapsedNano;
if ( sTimebaseInfo.denom == 0 ) {
(void) mach_timebase_info(&sTimebaseInfo);
}
// Do the maths. We hope that the multiplication doesn't
// overflow; the price you pay for working in fixed point.
return (Start * sTimebaseInfo.numer) / sTimebaseInfo.denom;
#else
// Need to figure out what to do for Linux?
return 0;