kernel: minor cleanups

Suggested by clippy :)

Signed-off-by: Anhad Singh <andypythonappdeveloper@gmail.com>

Author: Andy-Python-Programmer

src/aero_kernel/src/acpi/rsdp.rs

@@ -39,21 +39,10 @@ pub(super) unsafe fn validate_checksum(ptr: *const u8, size: usize) -> bool {
     sum == 0
 }
 
-pub(super) trait RsdtTyp {
-    fn as_usize(self) -> usize;
-}
-
-impl RsdtTyp for u32 {
-    fn as_usize(self) -> usize {
-        self as _
-    }
-}
+pub(super) trait RsdtTyp {}
 
-impl RsdtTyp for u64 {
-    fn as_usize(self) -> usize {
-        self as _
-    }
-}
+impl RsdtTyp for u32 {}
+impl RsdtTyp for u64 {}
 
 pub(super) trait RsdtHeader {
     fn signature(&self) -> &[u8];
@@ -103,7 +92,7 @@ pub(super) struct Rsdt<T: RsdtTyp + core::marker::Sized> {
 
 impl Rsdt<u32> {
     pub fn new(address: VirtAddr) -> &'static Self {
-        let this = unsafe { &*(address.as_ptr() as *const Self) };
+        let this = unsafe { &*address.as_ptr::<Self>() };
 
         let valid_checksum = this.header.is_valid();
         let valid_signature = this.header.signature() == b"RSDT";
@@ -144,7 +133,7 @@ impl Rsdt<u32> {
 
 impl Rsdt<u64> {
     pub fn new(address: VirtAddr) -> &'static Self {
-        let this = unsafe { &*(address.as_ptr() as *const Self) };
+        let this = unsafe { &*address.as_ptr::<Self>() };
 
         let valid_checksum = this.header.is_valid();
         let valid_signature = this.header.signature() == b"XSDT";
@@ -191,7 +180,7 @@ pub(super) enum RsdtAddress {
 
 pub(super) fn find_rsdt_address(rsdp_address: VirtAddr) -> RsdtAddress {
     // Look for RSDP v2 header, and if it does not exists, look for RSDP v1 header.
-    let v20 = unsafe { &*(rsdp_address.as_ptr() as *const Rsdp20) };
+    let v20 = unsafe { &*rsdp_address.as_ptr::<Rsdp20>() };
     let is_v20 = v20.revision >= 2 && v20.xsdt_address != 0;
 
     if is_v20 {
@@ -201,7 +190,7 @@ pub(super) fn find_rsdt_address(rsdp_address: VirtAddr) -> RsdtAddress {
         let xsdt_address = PhysAddr::new(v20.xsdt_address).as_hhdm_virt();
         RsdtAddress::Xsdt(xsdt_address)
     } else {
-        let v10 = unsafe { &*(rsdp_address.as_ptr() as *const Rsdp10) };
+        let v10 = unsafe { &*rsdp_address.as_ptr::<Rsdp10>() };
         let valid = validate_rsdt_checksum(v10);
 
         assert!(valid, "rsdp: failed to validate RSDP v10 checksum");

src/aero_kernel/src/mem/paging/addr.rs

@@ -122,7 +122,7 @@ impl VirtAddr {
     /// ```
     pub fn read_mut<'a, T: Sized>(&self) -> Result<&'a mut T, ReadErr> {
         self.validate_read::<T>()?;
-        Ok(unsafe { &mut *(self.as_mut_ptr() as *mut T) })
+        Ok(unsafe { &mut *self.as_mut_ptr() })
     }
 
     pub fn as_bytes_mut(&self, size_bytes: usize) -> &mut [u8] {

src/aero_kernel/src/utils/dma.rs

@@ -37,7 +37,7 @@ unsafe impl Allocator for DmaAllocator {
         let virt = phys.as_hhdm_virt();
 
         // SAFETY: The frame is aligned and non-null.
-        let ptr = unsafe { NonNull::new_unchecked(virt.as_mut_ptr() as *mut u8) };
+        let ptr = unsafe { NonNull::new_unchecked(virt.as_mut_ptr()) };
         Ok(NonNull::slice_from_raw_parts(ptr, size_bytes))
     }
 

src/aero_syscall/src/lib.rs

@@ -17,6 +17,8 @@
 
 #![no_std]
 #![feature(decl_macro)]
+// cc <https://github.com/bitflags/bitflags/issues/110>
+#![allow(clippy::bad_bit_mask)]
 
 #[macro_use]
 extern crate num_derive;