Model-Specific Registers (MSRs) control CPU architectural features:

#define IA32_LSTAR_MSR 0xC0000082 // Syscall Target Address
#define IA32_GS_BASE_MSR 0xC0000101 // KPCR / Thread Pointer

// Read syscall entry point
ULONG64 lstar = __readmsr(IA32_LSTAR_MSR);
printf("[KERNEL] System Call Target Address: 0x%llX\n", lstar);

Useful for verifying kernel integrity and checking if system call dispatchers have been tampered with.

IA32_GS_BASE holds the pointer to KPCR (Kernel Processor Control Region) which is fundamental to Windows thread scheduling.

Clean MSR register querying.