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| Kernel Functions for Drivers | ddi_dma_curwin(9F) |
| | ddi_dma_curwin - report current DMA window offset and size |
SYNOPSIS
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#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_curwin(ddi_dma_handle_t handle, off_t *offp, uint_t *lenp); |
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Solaris SPARC DDI specific (Solaris SPARC DDI).
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handle
- The DMA handle filled in by a call to ddi_dma_setup(9F).
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offp
- A pointer to a value which will be filled in with the current offset from the beginning of the object that is mapped for DMA.
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lenp
- A pointer to a value which will be filled in with the size, in bytes, of the current window onto the object that is mapped
for DMA.
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ddi_dma_curwin() reports the current DMA window offset and size. If a DMA mapping allows partial mapping, that
is if the DDI_DMA_PARTIAL flag in the ddi_dma_req(9S) structure is set, its current (effective) DMA window offset and size can be obtained by a call to ddi_dma_curwin().
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ddi_dma_curwin() returns:
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DDI_SUCCESS
- The current length and offset can be established.
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DDI_FAILURE
- Otherwise.
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ddi_dma_curwin() can be called from user or interrupt context.
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