Memory (NetBSD): change formula to be consistant with other systems

CMakeLists.txt

@@ -752,7 +752,7 @@ elseif(NetBSD)
         src/detection/localip/localip_linux.c
         src/detection/gamepad/gamepad_nosupport.c
         src/detection/media/media_linux.c
-        src/detection/memory/memory_obsd.c
+        src/detection/memory/memory_nbsd.c
         src/detection/mouse/mouse_nosupport.c
         src/detection/netio/netio_bsd.c
         src/detection/opengl/opengl_linux.c

src/detection/memory/memory_bsd.c

@@ -4,13 +4,7 @@
 const char* ffDetectMemory(FFMemoryResult* ram)
 {
     size_t length = sizeof(ram->bytesTotal);
-    if (sysctl((int[]){ CTL_HW,
-#if __NetBSD__
-        HW_PHYSMEM64
-#else
-        HW_PHYSMEM
-#endif
-    }, 2, &ram->bytesTotal, &length, NULL, 0))
+    if (sysctl((int[]){ CTL_HW, HW_PHYSMEM }, 2, &ram->bytesTotal, &length, NULL, 0))
         return "Failed to read hw.physmem";
 
     // vm.stats.vm.* are int values

src/detection/memory/memory_nbsd.c

@@ -0,0 +1,18 @@
+#include "memory.h"
+#include "common/sysctl.h"
+
+#include <sys/param.h>
+#include <uvm/uvm_extern.h>
+
+const char* ffDetectMemory(FFMemoryResult* ram)
+{
+    struct uvmexp_sysctl buf;
+    size_t length = sizeof(buf);
+    if (sysctl((int[]){ CTL_VM, VM_UVMEXP2 }, 2, &buf, &length, NULL, 0) < 0)
+        return "sysctl(CTL_VM, VM_UVMEXP2) failed";
+
+    ram->bytesTotal = (uint64_t) buf.npages * instance.state.platform.sysinfo.pageSize;
+    ram->bytesUsed = ((uint64_t) buf.active + (uint64_t) buf.inactive + (uint64_t) buf.wired) * instance.state.platform.sysinfo.pageSize;
+
+    return NULL;
+}