[RFC] Inter-processor Mailboxes Drivers
meador_inge at mentor.com
Sat Feb 12 08:19:51 EST 2011
I am currently working on building AMP systems using OpenMCAPI
(https://bitbucket.org/hollisb/openmcapi/wiki/Home) as the
inter-processor communication mechanism. With OpenMCAPI we, of course,
need a way to send messages to various cores. On some Freescale PPC
platforms (e.g. P1022DS, MPC8572DS), we have been using message
registers to do this work. Recently, I was looking at the OMAP4
mailboxes to gear up for moving into ARM based platforms.
With that, I noticed 'arch/arm/plat-omap/mailbox.c'. This is very
specific to the OMAP4 boards. I am looking at designing a new set of
drivers to expose a mailbox service to userspace that will be used
for inter-processor communication. This would entail the traditional
generic/specific driver split:
1. Hardware specific bits somewhere under '.../arch/*'. Drivers
for the MPIC message registers on Power and OMAP4 mailboxes, for
2. A higher level driver under '.../drivers/mailbox/*'. That the
pieces in (1) would register with. This piece would expose the
main kernel API.
3. Userspace interfaces for accessing the mailboxes. A
'/dev/mailbox1', '/dev/mailbox2', etc... mapping, for example.
Now I have the following questions:
1. Do others see value in this?
2. Does something like this already exist?
3. Is someone else already working on this?
Any feedback will be greatly appreciated.
Meador Inge | meador_inge AT mentor.com
Mentor Embedded | http://www.mentor.com/embedded-software
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