Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


Xilinx PPC Question

Posted 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.


RE: Xilinx PPC Question

Posted 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.


RE: Xilinx PPC Question

Posted by Woody on May 2, 2013
Thanks for the quick response, I will take a look at the xilinx bsp code.

[ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ]

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers


STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner