add from_slice to VirtAddr

src/addr.rs

@@ -10,7 +10,7 @@
 use crate::structures::paging::{PageOffset, PageTableIndex};
 use bit_field::BitField;
 
 const ADDRESS_SPACE_SIZE: u64 = 0x1_0000_0000_0000;
 
 /// A canonical 64-bit virtual memory address.
 ///
@@ -129,8 +129,8 @@
     // doesn't truncate.
     #[cfg(any(target_pointer_width = "32", target_pointer_width = "64"))]
     #[inline]
-    pub fn from_ptr<T>(ptr: *const T) -> Self {
-        Self::new(ptr as u64)
+    pub fn from_ptr<T: ?Sized>(ptr: *const T) -> Self {
+        Self::new(ptr as *const () as u64)
     }
 
     /// Converts the address to a raw pointer.
@@ -226,7 +226,7 @@
     }
 
     // FIXME: Move this into the `Step` impl, once `Step` is stabilized.
     pub(crate) fn steps_between_impl(start: &Self, end: &Self) -> Option<usize> {
         let mut steps = end.0.checked_sub(start.0)?;
 
         // Check if we jumped the gap.
@@ -238,7 +238,7 @@
     }
 
     // FIXME: Move this into the `Step` impl, once `Step` is stabilized.
     pub(crate) fn forward_checked_impl(start: Self, count: usize) -> Option<Self> {
         let offset = u64::try_from(count).ok()?;
         if offset > ADDRESS_SPACE_SIZE {
             return None;
@@ -844,4 +844,11 @@
     fn test_phys_addr_align_up_overflow() {
         PhysAddr::new(0x000f_ffff_ffff_ffff).align_up(2u64);
     }
+
+    #[test]
+    fn test_from_ptr_array() {
+        let slice = &[1, 2, 3, 4, 5];
+        // Make sure that from_ptr(slice) is the address of the first element
+        assert_eq!(VirtAddr::from_ptr(slice), VirtAddr::from_ptr(&slice[0]));
+    }
 }