ddi_dma_devalign(9F) Kernel Functions for Drivers ddi_dma_devalign(9F)NAME
ddi_dma_devalign - find DMA mapping alignment and minimum transfer size
SYNOPSIS
#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);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
handle The DMA handle filled in by a successful call to ddi_dma_setup(9F).
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.
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_x86(9S)). This also is guaranteed to be a power of two.
DESCRIPTION
ddi_dma_devalign() determines after a successful DMA mapping (see ddi_dma_setup(9F)) the minimum required data alignment and minimum DMA
transfer size.
RETURN VALUES
ddi_dma_devalign() returns:
DDI_SUCCESS The alignment and minxfr values have been filled.
DDI_FAILURE The handle was illegal.
CONTEXT
ddi_dma_devalign() can be called from user or interrupt context.
SEE ALSO ddi_dma_setup(9F), ddi_iomin(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_dma_devalign(9F)
Check Out this Related 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). This interface is obsolete.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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| 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 04 Apr 2006 ddi_iomin(9F)
The UNIX and Linux Forums have a number of active members that have published books or papers related to shell programming and scripting. You can check out their publications here:
Link Removed
Please note, as you can imagine, our forum experts can be quite busy! You will get a response... (0 Replies)
Emergency UNIX and Linux Support !! Help Me! Forum (Request Urgent Help)
README FIRST: How to Request Emergency or Urgent Help:
You may post emergency work-related questions in the emergency forum. To post in this forum you will need to use your Bits. All questions answered on a "best... (0 Replies)
Homework Help:
On Posting Questions:
Any and all high school and undergraduate homework assignments or textbook style exercises for which you are seeking assistance are to be posted only in our Homework & Coursework Questions area--not in blogs, visitor messages, PMs, or the main technical... (0 Replies)
Dear Forum Members,
The UNIX and Linux Forums are working directly with the Red Cross to provide ad banners on our site to support Earthquake and Tsunami Relief in Japan. Registered users do not see these banners. However, if you wish to contribute directly on behalf of yourself and the... (8 Replies)
How to Use Code Tags in The UNIX and Linux Forums
Developer: This video tutorial was created by scott for forum users. Everyone should use code tags when posting code and command line logic in the forums.
cPF45jjWe7Q
A full list of BB codes is available here. (8 Replies)
RULES OF THE UNIX AND LINUX FORUMS
For the latest version of the community rules (the official community rules page), please visit here.
No flames, shouting (all caps), sarcasm, bullying, profanity or arrogant posts.
No negative comments about others or impolite remarks. Be patient. No... (1 Reply)
I see lot of ad-hoc shell scripts in our servers which don't have a shebang at the beginning .
Does this mean that it will run on any shell ?
Is it a good practice to create scripts (even ad-hoc ones) without shebang ? (16 Replies)
Having spent a lot of time over the past year taking a legacy vBulletin site (this forum) and making the site responsive on mobile; I've happy with the results; but it will soon be time to move on.
Basically, at our core, we are a LAMP (Linux, Apache2, MySQL and PHP) site, and vBulletin was... (6 Replies)
Here are some answers to some of the recent questions I have received about UNIX.COM. So, I thought I would take time to answer them here in this post:
Is it expected that the original poster "thank" everyone who responds to his / her discussion thread?
It is always a good practice in all... (7 Replies)
By special request, and long overdue, I have updated our "code tags" video and so now we have:
How to Use Code Tags and Format Posts @UNIX.com in 4K
https://youtu.be/4BuPvWJV__k (3 Replies)
Here is a quick EOY report for 2019.
2019 has been a year of "downward trend reversal" for UNIX.com. In fact, if we compare total Google search impressions from the peak days in December 2019 to the peak days in mid December 2018, traffic is up 43% percent. That is a very respectable growth... (0 Replies)