Question about LinkId, procId and SelfProcId

bing liu

Expert 2900 points

Hi,

I am confused with the LinkId, procId and SelfProcId. In system_linkId.h, there are three defines

#define SYSTEM_MAKE_LINK_ID(p, x) (((p) <<28) | ((x) & 0x0FFFFFFF))

#define SYSTEM_GET_LINK_ID(x) ((x) & 0x0FFFFFFF)

#define SYSTEM_GET_PROC_ID(x) (((x) & ~0x0FFFFFFF)>>28)

In system_common.c, there is a function called System_getSelfProcId. It will called to get procId. I think this function is the same as SYSTEM_GET_PROC_ID

The System_sendLinkCmd() function will check if SYSTEM_GET_PROC_ID(LinkId)!=System_getSelfProcId(), then decide to send command to MsgQ or local. I don't understand for whick Link the above condition will be true.

Could someone give me an example?

Thanks in advance!

over 11 years ago

0 Badri Narayanan over 11 years ago

TI__Guru 59700 points

The upper four bits of linkID is the procId which indicates the core on which the link runs.

If link runs on different core from A8 it has to send IPC MessageQ to send commands else it can use mailbox msgs.

The condition of SYSTEM_GET_PROC_ID(LinkId)!=System_getSelfProcId() will be true for all links excepts ipcBitsInLinkHOST/ipcBitsOutLinkHOST/ipcFramesInLinkHOST/ipcFramesOutLinkHOST which run on A8

0 bing liu over 11 years ago in reply to Badri Narayanan

Expert 2900 points

Hi Badri,

Thanks for your reply!

For these four links, both of the two ID are ARM. For the other links, the System_getSelfProId will return DSP/VPSS/VIDEO and the SYSTEM_GET_PROC_ID(LinkId) will always be ARM. Is that right?

0 Badri Narayanan over 11 years ago in reply to bing liu

TI__Guru 59700 points

No for other links System_getSelfProId call on A8 will return ARM and SYSTEM_GET_PROC_ID(LinkId) call on any core will return DSP/VPSS/VIDEO depending on where the link is running.

0 bing liu over 11 years ago in reply to Badri Narayanan

Expert 2900 points

Hi Badri,

Thanks a lot !

By the way,could you please see the post at http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/297057.aspx ? I have some problems with program exit.

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Question about LinkId, procId and SelfProcId