Added ARM archictecture detection to avoid the native call error when RDTSC used #227
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… RDTSC is used in linux, temporary using Enviroment.Tickcount
somdoron
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Feb 9, 2015
Added ARM archictecture detection to avoid the native call error when RDTSC used
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During a development with an Arm device and using Netmq, the device send an exception related to the use of a native call using mmap and the RDTSC instructions for x86. The problem is RDTSC don't exist in the ARM instructions set(must use a cycle counter at kernel leve in linux). This happens when you implements a poller.
I applied a workaround, detecting if NetMQ is running in an Arm device, set the RSTSC delegate to a function that returns the current tick count that mono(and .Net) provides. I am planning to implement the native call in asm for the cycle counter but in this moment seems to be a little more complex for my current knowledge, but i am working on it.
The required asm calls are documented in this asm codefile:
https://github.com/prabindh/peemuperf/blob/master/v7_pmu.S
I tested the change in two devices, one is a custom Arm board with ubuntu 12.04 and the last version of mono compiled in the device. Also in a raspberry Pi.
Thanks