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| Kernel Functions for Drivers | ddi_dma_numwin(9F) |
| | ddi_dma_numwin - retrieve number of DMA windows |
SYNOPSIS
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#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_numwin(ddi_dma_handle_t handle, uint_t *nwinp); |
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handle
- The DMA handle previously allocated by a call to ddi_dma_alloc_handle(9F).
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nwinp
- Upon a successful return, nwinp will contain the number of DMA
windows for this object.
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Solaris DDI specific (Solaris DDI).
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ddi_dma_numwin() returns the number of DMA windows for a DMA object if partial resource allocation was permitted.
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ddi_dma_numwin() returns:
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DDI_SUCCESS
- Successfully filled in the number of DMA windows.
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DDI_FAILURE
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DMA windows are not activated.
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ddi_dma_numwin() can be called from user, kernel, or interrupt context.
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