FreeRTOS Support Archive
The FreeRTOS support forum is used to obtain active support directly from Real
Time Engineers Ltd. In return for using our top quality software and services for
free, we request you play fair and do your bit to help others too! Sign up
to receive notifications of new support topics then help where you can.
This is a read only archive of threads posted to the FreeRTOS support forum.
The archive is updated every week, so will not always contain the very latest posts.
Use these archive pages to search previous posts. Use the Live FreeRTOS Forum
link to reply to a post, or start a new support thread.
[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [May 2013 Threads] Xilinx PPC QuestionPosted by Woody on May 1, 2013 I realize that the ports for Xilinx PPC are not being updated but I was looking at the port for both PPC405 and PPC440 and I cant how these would work compared to other ports. I see no where that the general registers are saved or restored prior to or after a context switch, just curious how this would work, I was using this as a reference for another PPC port since I have xilinx board handy. It seems like only the LR and SP are saved.
Thanks, John
RE: Xilinx PPC QuestionPosted by Richard on May 1, 2013 As I recall in those ports the interrupts are managed by the Xilinx code. An interrupt handler is registered with the Xilinx interrupt handling code, then when an interrupt is taken the processor context is saved on interrupt entry (within the Xilinx code), the Xilinx libraries then determine the interrupt source and if a handler has been registered for the source executes the handler. Then when the handler has been executed the Xilinx code restores the processor context which may be for a different task if the interrupt was a yeild or tick. The port layer of the kernel probably only saves the registers necessary to make any assembly function calls, rather than the whole task context as that has already been saved.
Regards.
RE: Xilinx PPC QuestionPosted by Woody on May 2, 2013 Thanks for the quick response, I will take a look at the xilinx bsp code.
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.
|