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| Kernel Functions for Drivers | ddi_dma_devalign(9F) |
| | ddi_dma_devalign - find DMA mapping alignment and minimum transfer size |
SYNOPSIS
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#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_devalign(ddi_dma_handle_t handle, uint_t *alignment, uint_t *minxfr); |
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Solaris DDI specific (Solaris DDI).
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handle
- The DMA handle filled in by a successful call to ddi_dma_setup(9F).
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alignment
- A pointer to an unsigned integer to be filled in with the minimum required alignment for DMA. The alignment is guaranteed to be a power of two.
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minxfr
- A pointer to an unsigned integer to be filled in with the minimum effective transfer size (see ddi_iomin(9F), ddi_dma_lim_sparc(9S) and ddi_dma_lim_IA(9s)).
This also is guaranteed to be a power of two.
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ddi_dma_devalign() determines after a successful DMA mapping (see ddi_dma_setup(9F)) the minimum required data alignment and minimum DMA transfer size.
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ddi_dma_devalign() returns:
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DDI_SUCCESS
- The alignment and minxfr values have been filled.
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DDI_FAILURE
- The handle was illegal.
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ddi_dma_devalign() can be called from user or interrupt context.
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