ostd::mm::heap

Struct HeapSlot

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pub struct HeapSlot {
    addr: NonNull<u8>,
    info: SlotInfo,
}
Expand description

A slot that will become or has been turned from a heap allocation.

Heap slots can come from Slab or directly from a typed Segment.

Heap slots can be used to fulfill heap allocations requested by the allocator. Upon deallocation, the deallocated memory also becomes a heap slot.

The size of the heap slot must match the slot size of the Slab or the size of the Segment.

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§addr: NonNull<u8>

The address of the slot.

§info: SlotInfo

The type and size of the slot.

Implementations§

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impl HeapSlot

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pub(super) unsafe fn new(addr: NonNull<u8>, info: SlotInfo) -> Self

Creates a new pointer to a heap slot.

  • addr should be a valid instance of free slot in a super::Slab or Segment with corresponding size.
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pub fn alloc_large(size: usize) -> Result<Self, AllocError>

Allocates a large slot.

This function allocates in units of PAGE_SIZE bytes.

This function returns an error if the frame allocation fails.

§Panics

This function panics if the size is not a multiple of PAGE_SIZE.

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pub fn dealloc_large(self)

Deallocates a large slot.

§Panics

This function aborts if the slot was not allocated with HeapSlot::alloc_large, as it requires specific memory management operations that only apply to large slots.

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pub fn paddr(&self) -> Paddr

Gets the physical address of the slot.

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pub fn size(&self) -> usize

Gets the size of the slot.

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pub fn info(&self) -> SlotInfo

Gets the type and size of the slot.

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pub fn as_ptr(&self) -> *mut u8

Gets the pointer to the slot.

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