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How to Determine Hardware Mode of Intel CPU

Consider the following output: # grep flags /proc/cpuinfo flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc pni monitor ssse3 lahf_lm How can you the maximum size of a long that can be used with this CPU? The answer is 64-bit because of the presence of the lm flag. The following flags can be used to determine the maximum size of a long for a CPU: lm – Long Mode (64 bits) tm – Protected mode (32-bit) rm – Real Mode