Subject: [PATCH] Fix Darwin sysctl calls for PPC compatibility

The original code used x86-specific sysctl names that don't exist on
PowerPC macOS:
- vm.page_free_count: Use vm_stat command instead (universal)
- machdep.tsc.frequency: Use hw.cpufrequency instead (works on PPC)

---
 src/device.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/device.cpp b/src/device.cpp
index 6c9118a..af0e6e0 100644
--- a/src/device.cpp
+++ b/src/device.cpp
@@ -401,9 +401,13 @@ _cl_device_id::_cl_device_id() :
 		name = trim(run_command("/usr/sbin/sysctl hw.model | awk '{ for(i=2;i<NF;++i) print $i }' | tr \"\\n\" \" \""));
 		vendor = trim(run_command("/usr/sbin/sysctl hw.model | awk '{ print $2 }'"));
 		memsize = parse_int(run_command("/usr/sbin/sysctl hw.memsize | awk '{ print $NF }'"));
-		freememsize = parse_int(run_command("/usr/sbin/sysctl vm.page_free_count | awk '{ print $NF }'"))
+		// vm.page_free_count doesn't exist on older/PPC macOS, use vm_stat instead
+		freememsize = parse_int(run_command("vm_stat | awk '/Pages free/ { gsub(/\\./, \"\", $3); print $3 }'"))
 				* parse_int(run_command("/usr/sbin/sysctl hw.pagesize | awk '{ print $NF }'"));
-		max_clock_frequency = parse_int(run_command("/usr/sbin/sysctl machdep.tsc.frequency | awk '{ print $NF }'"));
+		// machdep.tsc.frequency is x86-only, use hw.cpufrequency (works on PPC)
+		max_clock_frequency = parse_int(run_command("/usr/sbin/sysctl hw.cpufrequency 2>/dev/null | awk '{ print $NF }'"));
+		if (max_clock_frequency == 0)
+			max_clock_frequency = parse_int(run_command("/usr/sbin/sysctl hw.cpufrequency_max 2>/dev/null | awk '{ print $NF }'"));
 	}
 #ifdef FREEOCL_OS_WINDOWS
     else if (ostype == "Windows")