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The kernel is the shared surfaceWhen any code runs on Linux, it interacts with the hardware through the kernel via system calls. The Linux kernel exposes roughly 340 syscalls, and the kernel implementation is tens of millions of lines of C code. Every syscall is an entry point into that codebase.
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say that, despite earlier dabbling, it was the 360/370 that truly ushered in the，更多细节参见同城约会
Bits [13:2]: A 12-bit microcode redirect address -- a fault handler (e.g., 0x85D for #GP, 0x870 for #NP) or a gate dispatch routine (e.g., 0x5BE for a 386 call gate).