参照元†
/**
* enum ion_heap_types - list of all possible types of heaps
* @ION_HEAP_TYPE_SYSTEM: memory allocated via vmalloc
* @ION_HEAP_TYPE_SYSTEM_CONTIG: memory allocated via kmalloc
* @ION_HEAP_TYPE_CARVEOUT: memory allocated from a prereserved
* carveout heap, allocations are physically
* contiguous
* @ION_HEAP_TYPE_DMA: memory allocated via DMA API
* @ION_NUM_HEAPS: helper for iterating over heaps, a bit mask
* is used to identify the heaps, so only 32
* total heap types are supported
*/
enum ion_heap_type {
ION_HEAP_TYPE_SYSTEM,
ION_HEAP_TYPE_SYSTEM_CONTIG,
ION_HEAP_TYPE_CARVEOUT,
ION_HEAP_TYPE_CHUNK,
ION_HEAP_TYPE_DMA,
ION_HEAP_TYPE_CUSTOM, /*
* must be last so device specific heaps always
* are at the end of this enum
*/
ION_NUM_HEAPS = 16,
};
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