Web Reference: We will also look at the two privilege modes, user mode and kernel mode, the mechanisms to cross between then, and the reason why they exist in the first place. We will have a look at what syscalls are and what it has to do with the kernel mode an user mode. We do this by exploring a kernel function and trace it down... A system call is the way you transition between the application ("user mode") and the kernel. Syscalls are slower than normal function calls, but newer x86 chips from Intel and AMD have a special sysenter / syscall opcode to make it take just a hundred nanoseconds or so, give or take.
YouTube Excerpt: We will have a look at what
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