Megacommit to move some memory code into kernel crate

kernel/src/arch/x86_64/cpu.rs

@@ -3,11 +3,11 @@ pub mod model_specific_registers {
     use spin::Lazy;
     use x86_64::registers::model_specific::Msr;
 
-    const CPUID_FLAG_MSR: u32 = 1 << 5;
-    static EDX: Lazy<u32> = Lazy::new(|| unsafe { __cpuid(1).edx });
+    const _CPUID_FLAG_MSR: u32 = 1 << 5;
+    static _EDX: Lazy<u32> = Lazy::new(|| unsafe { __cpuid(1).edx });
 
-    pub fn cpu_has_msr() -> bool {
-        *EDX & CPUID_FLAG_MSR != 0
+    pub fn _cpu_has_msr() -> bool {
+        *_EDX & _CPUID_FLAG_MSR != 0
     }
 
     pub fn cpu_get_msr(msr: u32, value: &mut u64) {