Add a config.mk file where global variables can be modified, add aarch64

interrupts with IRQ and syscalls, make phys_to_virt checked, recreate
stack on aarch64, make serial console finally line wrap and have max
height correctly, add U64Buf for when i need number debug, rename mouse
and keyboard files to kmi and merge them, add non-working pl050 support

kernel/build.rs

@@ -1,5 +1,23 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
 fn main() {
     let arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
+
+    let timer_frequency_hz = env::var("TIMER_FREQUENCY_HZ").unwrap_or_else(|_| "1000".to_string());
+
+    let out_dir = PathBuf::from("src");
+    fs::write(
+        out_dir.join("config.rs"),
+        format!(r#"pub const TIMER_FREQUENCY_HZ: usize = {timer_frequency_hz};"#),
+    )
+    .unwrap();
+
+    println!("cargo:rerun-if-env-changed=KARCH");
+    println!("cargo:rerun-if-env-changed=TIMER_FREQUENCY_HZ");
+    println!("cargo:rerun-if-env-changed=OUTPUT");
+
     // Tell cargo to pass the linker script to the linker..
     println!("cargo:rustc-link-arg=-Tlinker-{arch}.ld");
     // ..and to re-run if it changes.