+#undef DEBUG_LOG2
+
+#ifdef DEBUG_LOG2
#include <console/console.h>
+#endif
+
+/* Assume 8 bits per byte */
+#define CHAR_BIT 8
unsigned long log2(unsigned long x)
{
// assume 8 bits per byte.
- unsigned long i = 1 << (sizeof(x)*8 - 1);
- unsigned long pow = sizeof(x) * 8 - 1;
+ unsigned long i = 1ULL << (sizeof(x)* CHAR_BIT - 1ULL);
+ unsigned long pow = sizeof(x) * CHAR_BIT - 1ULL;
if (! x) {
+#ifdef DEBUG_LOG2
printk_warning("%s called with invalid parameter of 0\n",
- __FUNCTION__);
+ __func__);
+#endif
return -1;
}
for(; i > x; i >>= 1, pow--)