Brendan questions

Brendan answers

• nasm 64 bit push qword?
• measuring code execution times in C using RDTSC instruction
• Are "Protection rings" and "CPU modes" the same thing?
• How are instruction sets standardized?
• ASM - What is "%" used for?
• How is data copied from user space to kernel space and vice versa during I/O tasks?
• Cost of instruction jumps in assembly
• Application runs faster when not pegged to cores
• what would the system software have to do if the processor did not generate interrupts?
• Are characters signed or unsigned?