Manual Pages for UNIX Operating System command usage for man ddi_iomin

Kernel Functions for Drivers                        ddi_iomin(9F)



NAME
     ddi_iomin - find minimum alignment and transfer size for DMA

SYNOPSIS
     #include 
     #include 
     #include 



     int ddi_iomin(dev_info_t *dip, int initial, int streaming);


INTERFACE LEVEL
     Solaris  DDI  specific  (Solaris  DDI).  This  interface  is
     obsolete.

PARAMETERS
     dip          A pointer to the device's dev_info structure.


     initial      The initial minimum DMAtransfer 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
     The ddi_iomin() function, finds out the minimum  DMAtransfer
     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
     The ddi_iomin() function  returns  the  minimum  DMAtransfer
     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, interrupt, or  kernel
     context.





SunOS 5.11          Last change: 04 Apr 2006                    1






Kernel Functions for Drivers                        ddi_iomin(9F)



ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Obsolete                    |
    |_____________________________|_____________________________|


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 5.11          Last change: 04 Apr 2006                    2