09-29-2011
Thanks Pludi.
Could you be a bit more specific.
Cheers,
Sachin
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LEARN ABOUT MINIX
ddi_dma_cookie
ddi_dma_cookie(9S) Data Structures for Drivers ddi_dma_cookie(9S)
NAME
ddi_dma_cookie - DMA address cookie
SYNOPSIS
#include <sys/sunddi.h>
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
DESCRIPTION
The ddi_dma_cookie_t structure contains DMA address information required to program a DMA engine. The structure is filled in by a call to
ddi_dma_getwin(9F), ddi_dma_addr_bind_handle(9F), or ddi_dma_buf_bind_handle(9F), to get device-specific DMA transfer information for a DMA
request or a DMA window.
STRUCTURE MEMBERS
typedef struct {
union {
uint64_t _dmac_ll; /* 64 bit DMA address */
uint32_t _dmac_la[2]; /* 2 x 32 bit address */
} _dmu;
size_t dmac_size; /* DMA cookie size */
uint_t dmac_type; /* bus specific type bits */
} ddi_dma_cookie_t;
You can access the DMA address through the #defines: dmac_address for 32-bit addresses and dmac_laddress for 64-bit addresses. These macros
are defined as follows:
#define dmac_laddress _dmu._dmac_ll
#ifdef _LONG_LONG_HTOL
#define dmac_notused _dmu._dmac_la[0]
#define dmac_address _dmu._dmac_la[1]
#else
#define dmac_address _dmu._dmac_la[0]
#define dmac_notused _dmu._dmac_la[1]
#endif
dmac_laddress specifies a 64-bit I/O address appropriate for programming the device's DMA engine. If a device has a 64-bit DMA address reg-
ister a driver should use this field to program the DMA engine. dmac_address specifies a 32-bit I/O address. It should be used for devices
that have a 32-bit DMA address register. The I/O address range that the device can address and other DMA attributes have to be specified in
a ddi_dma_attr(9S) structure.
dmac_size describes the length of the transfer in bytes.
dmac_type contains bus-specific type bits, if appropriate. For example, a device on a PCI bus has PCI address modifier bits placed here.
SEE ALSO
pci(4), sbus(4), sysbus(4), ddi_dma_addr_bind_handle(9F), ddi_dma_buf_bind_handle(9F), ddi_dma_getwin(9F), ddi_dma_nextcookie(9F),
ddi_dma_attr(9S)
Writing Device Drivers
SunOS 5.10 30 Sep 1996 ddi_dma_cookie(9S)