Remove the shim kernel crate

kernel/src/syscall/mprotect.rs

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use align_ext::AlignExt;
+
+use super::SyscallReturn;
+use crate::{prelude::*, vm::perms::VmPerms};
+
+pub fn sys_mprotect(addr: Vaddr, len: usize, perms: u64, ctx: &Context) -> Result<SyscallReturn> {
+    let vm_perms = VmPerms::from_bits_truncate(perms as u32);
+    debug!(
+        "addr = 0x{:x}, len = 0x{:x}, perms = {:?}",
+        addr, len, vm_perms
+    );
+    let root_vmar = ctx.process.root_vmar();
+    debug_assert!(addr % PAGE_SIZE == 0);
+    let len = len.align_up(PAGE_SIZE);
+    let range = addr..(addr + len);
+    root_vmar.protect(vm_perms, range)?;
+    Ok(SyscallReturn::Return(0))
+}