Memory Allocation and Deallocation Functions (Writing Device Drivers)

Writing Device Drivers

Memory Allocation and Deallocation Functions

Table B-7 Memory Allocation and Deallocation Functions


Function Name	Description
kmem_alloc	allocate kernel memory
kmem_free	free kernel memory
kmem_zalloc	allocate zero-filled kernel memory

These functions allocate and free memory intended to be used for DMA. See "Direct Memory Access (DMA) Functions".

Table B-8


Function Name	Description
ddi_dma_mem_alloc	allocate memory for DMA transfer
ddi_dma_mem_free	free previously allocated DMA memory

These functions allocate and free memory intended to be exported to user space. See "User Space Access Functions".

Table B-9


Function Name	Description
ddi_umem_alloc	allocate page-aligned kernel memory
ddi_umem_free	free page-aligned kernel memory

Table B-10 Deprecated Memory Allocation and Deallocation Functions