rt_dma_pool Struct Reference

#include <dma.h>

Data Fields
rt_region_t	region
rt_list_t	list
rt_ubase_t	flags
rt_bitmap_t *	map
rt_size_t	bits
rt_ubase_t	start
struct rt_device *	dev

Detailed Description

DMA memory pool descriptor.

Manages a contiguous physical memory region for DMA allocations. Uses a bitmap to track free/used pages. Pools are organized in a global linked list.

Field Documentation

region

rt_region_t rt_dma_pool::region

Memory region (name, start, end)

list

rt_list_t rt_dma_pool::list

Node in the global pool list

flags

rt_ubase_t rt_dma_pool::flags

Pool flags (RT_DMA_F_LINEAR, RT_DMA_F_32BITS, etc.)

map

rt_bitmap_t* rt_dma_pool::map

Page allocation bitmap (1 bit per page)

bits

rt_size_t rt_dma_pool::bits

Total number of pages in this pool

start

rt_ubase_t rt_dma_pool::start

Page-aligned start address

dev

struct rt_device* rt_dma_pool::dev

Device that owns this pool (for RT_DMA_F_DEVICE)