DMA space C interface. More...

#include <l4/sys/types.h>
#include <l4/re/c/dataspace.h>

Include dependency graph for dma_space.h:

Enumerations
enum	l4re_dma_space_direction { L4RE_DMA_SPACE_BIDIRECTIONAL , L4RE_DMA_SPACE_TO_DEVICE , L4RE_DMA_SPACE_FROM_DEVICE , L4RE_DMA_SPACE_NONE }
	Direction of the DMA transfers. More...

enum	l4re_dma_space_space_attribs { L4RE_DMA_SPACE_COHERENT = 1 << 0 , L4RE_DMA_SPACE_PHYS_SPACE = 1 << 1 }
	Attributes assigned to the DMA space when associated with a specific device. More...

Functions
long	l4re_dma_space_map (l4re_dma_space_t dma, l4re_ds_t src, l4re_ds_offset_t offset, l4_size_t size, unsigned long attrs, enum l4re_dma_space_direction dir, l4re_dma_space_dma_addr_t dma_addr) L4_NOTHROW
	Map the given part of this data space into the DMA address space.

long	l4re_dma_space_unmap (l4re_dma_space_t dma, l4re_dma_space_dma_addr_t dma_addr, l4_size_t size, unsigned long attrs, enum l4re_dma_space_direction dir) L4_NOTHROW
	Unmap the given part of this data space from the DMA address space.

long	l4re_dma_space_associate (l4re_dma_space_t dma, l4_cap_idx_t dma_task, unsigned long attr) L4_NOTHROW
	Associate a (kernel) DMA space for a device to this Dma_space.

long	l4re_dma_space_disassociate (l4re_dma_space_t dma)
	Disassociate the (kernel) DMA space from this Dma_space.

Detailed Description

DMA space C interface.

Definition in file dma_space.h.

Enumeration Type Documentation

Direction of the DMA transfers.

Enumerator
L4RE_DMA_SPACE_BIDIRECTIONAL	device reads and writes to the memory
L4RE_DMA_SPACE_TO_DEVICE	device reads the memory
L4RE_DMA_SPACE_FROM_DEVICE	device writes to the memory
L4RE_DMA_SPACE_NONE	device is coherently connected

Definition at line 37 of file dma_space.h.

Attributes assigned to the DMA space when associated with a specific device.

Enumerator

L4RE_DMA_SPACE_COHERENT

The device is connected coherently with the cache.

This means that the map() and unmap() do not need to sync CPU caches before and after DMA.

L4RE_DMA_SPACE_PHYS_SPACE

The DMA space has no DMA task assigned and uses the CPUs physical memory.

Definition at line 48 of file dma_space.h.