NAME

ddi_dma_cookie - DMA address cookie

SYNOPSIS

#include <sys/sunddi.h>

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).

DESCRIPTION

The ddi_dma_cookie structure (ddi_dma_cookie_t) contains DMA address information required to program a DMA engine. It is filled in by a call to ddi_dma_htoc(9F) or ddi_dma_movwin(9F) when a driver wants to get device specific DMA transfer information out of a DMA handle or DMA window (see ddi_dma_setup(9F)).

STRUCTURE MEMBERS

unsigned long

dmac_address;

/* unsigned 32 bit address * /

u_int            dmac_size;         /* unsigned 32 bit size * /
u_int            dmac_type;         /* bus specific type bits * /

dmac_address specifies an unsigned 32 bit address appropriate for programming the device's DMA engine.

dmac_size describes the length of the transfer.

dmac_type contains bus specific type bits (if appropriate). For example, a device on a VME bus will have VME address modifier bits placed here.

SEE ALSO

sbus(4), vme(4), ddi_dma_coff(9F), ddi_dma_free(9F), ddi_dma_htoc(9F), ddi_dma_movwin(9F), ddi_dma_setup(9F)

Writing Device Drivers