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Kernel Functions for Driversddi_dma_buf_setup(9F)


NAME

 ddi_dma_buf_setup - easier DMA setup for use with buffer structures

SYNOPSIS

 
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_buf_setup(dev_info_t *dip, struct buf *bp, uint_t flags, int (*waitfp) (caddr_t),, caddr_t arg, ddi_dma_lim_t *lim, ddi_dma_handle_t *handlep);

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

PARAMETERS

 
dip
A pointer to the device's dev_info structure.
bp
A pointer to a system buffer structure (see buf(9S)).
flags
Flags that go into a ddi_dma_req structure (see ddi_dma_req(9S)).
waitfp
The address of a function to call back later if resources aren't available now. The special function addresses DDI_DMA_SLEEP and DDI_DMA_DONTWAIT (see ddi_dma_req(9S)) are taken to mean, respectively, wait until resources are available, or do not wait at all and do not schedule a callback.
arg
Argument to be passed to a callback function, if such a function is specified.
lim
A pointer to a DMA limits structure for this device (see ddi_dma_lim_sparc(9S) or ddi_dma_lim_x86(9S)). If this pointer is NULL, a default set of DMA limits is assumed.
handlep
Pointer to a DMA handle. See ddi_dma_setup(9F) for a discussion of handle.

DESCRIPTION

 

ddi_dma_buf_setup() is an interface to ddi_dma_setup(9F). It uses its arguments to construct an appropriate ddi_dma_req structure and calls ddi_dma_setup() with it.

RETURN VALUES

 

See ddi_dma_setup(9F) for the possible return values for this function.

CONTEXT

 

ddi_dma_buf_setup() can be called from user or interrupt context, except when waitfp is set to DDI_DMA_SLEEP, in which case it can be called from user context only.

SEE ALSO

 

ddi_dma_addr_setup(9F), ddi_dma_free(9F), ddi_dma_htoc(9F), ddi_dma_setup(9F), ddi_dma_sync(9F), physio(9F), buf(9S), ddi_dma_lim_sparc(9S), ddi_dma_lim_x86(9S), ddi_dma_req(9S)

Writing Device Drivers


SunOS 5.9Go To TopLast Changed 1 Feb 1994

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.