ddi_iomin(9f) [hpux man page]
ddi_iomin(9F) Kernel Functions for Drivers ddi_iomin(9F) NAME
ddi_iomin - find minimum alignment and transfer size for DMA SYNOPSIS
#include <sys/conf.h> #include <sys/ddi.h> #include <sys/sunddi.h> int ddi_iomin(dev_info_t *dip, int initial, int streaming); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). PARAMETERS
dip A pointer to the device's dev_info structure. initial The initial minimum DMA transfer size in bytes. This may be zero or an appropriate dlim_minxfer value for device's ddi_dma_lim structure (see ddi_dma_lim_sparc(9S) or ddi_dma_lim_x86(9S)). This value must be a power of two. streaming This argument, if non-zero, indicates that the returned value should be modified to account for streaming mode accesses (see ddi_dma_req(9S) for a discussion of streaming versus non-streaming access mode). DESCRIPTION
ddi_iomin(), finds out the minimum DMA transfer size for the device pointed to by dip. This provides a mechanism by which a driver can determine the effects of underlying caches as well as intervening bus adapters on the granularity of a DMA transfer. RETURN VALUES
ddi_iomin() returns the minimum DMA transfer size for the calling device, or it returns zero, which means that you cannot get there from here. CONTEXT
This function can be called from user or interrupt context. SEE ALSO
ddi_dma_devalign(9F), ddi_dma_setup(9F), ddi_dma_sync(9F), ddi_dma_lim_sparc(9S), ddi_dma_lim_x86(9S), ddi_dma_req(9S) Writing Device Drivers SunOS 5.10 1 Feb 1994 ddi_iomin(9F)
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ddi_dma_buf_setup(9F) Kernel Functions for Drivers ddi_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
This interface is obsolete. ddi_dma_buf_bind_handle(9F) should be used instead. 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 avail- able, 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. ATTRIBUTES
See attributes(5) for a description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Stability Level |Obsolete | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), 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 5.10 27 Sep 2002 ddi_dma_buf_setup(9F)