Initial Commit

Initial commit of arm64 bring-up code, kernel core (libkernel) and build
infrastructure.

libkernel/src/error/syscall_error.rs

@@ -0,0 +1,52 @@
+use crate::error::FsError;
+
+use super::KernelError;
+
+pub const EPERM: isize = -1;
+pub const ENOENT: isize = -2;
+pub const ESRCH: isize = -3;
+pub const EINTR: isize = -4;
+pub const EIO: isize = -5;
+pub const ENXIO: isize = -6;
+pub const E2BIG: isize = -7;
+pub const ENOEXEC: isize = -8;
+pub const EBADF: isize = -9;
+pub const ECHILD: isize = -10;
+pub const EAGAIN: isize = -11;
+pub const ENOMEM: isize = -12;
+pub const EACCES: isize = -13;
+pub const EFAULT: isize = -14;
+pub const ENOTBLK: isize = -15;
+pub const EBUSY: isize = -16;
+pub const EEXIST: isize = -17;
+pub const EXDEV: isize = -18;
+pub const ENODEV: isize = -19;
+pub const ENOTDIR: isize = -20;
+pub const EISDIR: isize = -21;
+pub const EINVAL: isize = -22;
+pub const ENFILE: isize = -23;
+pub const EMFILE: isize = -24;
+pub const ENOTTY: isize = -25;
+pub const ETXTBSY: isize = -26;
+pub const EFBIG: isize = -27;
+pub const ENOSPC: isize = -28;
+pub const ESPIPE: isize = -29;
+pub const EROFS: isize = -30;
+pub const EMLINK: isize = -31;
+pub const EPIPE: isize = -32;
+pub const EDOM: isize = -33;
+pub const ERANGE: isize = -34;
+pub const EWOULDBLOCK: isize = -EAGAIN;
+
+pub fn kern_err_to_syscall(err: KernelError) -> isize {
+    match err {
+        KernelError::BadFd => EBADF,
+        KernelError::InvalidValue => EINVAL,
+        KernelError::Fault => EFAULT,
+        KernelError::BrokenPipe => EPIPE,
+        KernelError::Fs(FsError::NotFound) => ENOENT,
+        KernelError::NotATty => ENOTTY,
+        KernelError::SeekPipe => ESPIPE,
+        _ => todo!(),
+    }
+}