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1842896ee9
Implement fast system calls using the x86-64 SYSCALL/SYSRET instructions: - Configure MSRs: EFER (enable SCE), STAR (segment selectors), LSTAR (entry point), SFMASK (disable interrupts on entry) - Add per-CPU data structure accessed via GS segment for kernel stack pointer storage during privilege transitions - Use SWAPGS in syscall entry to access per-CPU data and switch from user to kernel stack - Add SWAPGS before IRETQ to user mode to set up correct GS state for subsequent syscalls SYSCALL/SYSRET is significantly faster than INT 0x80 as it avoids IDT lookup and uses direct MSR-configured entry.