riscv : add riscv qemu virt support and fix fs bit error in mstatus

[Jer6y]

Hi , I port threadx to qemu-riscv64-virt and run the demo

I also add toolchain cmake scripts , so we can use cmake like arm to generated libthreadx.a

To Test it

First , Maksure riscv64-unknown-elf- binutils and make is installed , and qemu-system-riscv64 is also required

cd into example_build work

cd ports/risc-v64/gnu/example_build/qemu_virt

use make to compile the demo (make clean can clean the output)

make

If done successfully, we will find A ELF FILE kernel.elf , use qemu to load it

qemu-system-riscv64 -nographic -smp 1 -bios none -m 128M -machine virt -kernel kernel.elf

If success , you will get different thread output the message like this

[UART0] : Uart Init Done, this is Test output!
[Thread] : thread_0_entry is here!
[Thread] : thread_5_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_1_entry is here!
[Thread] : thread_2_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_0_entry is here!
[Thread] : thread_5_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_0_entry is here!
[Thread] : thread_5_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!
[Thread] : thread_3_and_4_entry is here!
[Thread] : thread_6_and_7_entry is here!

PR checklist

• add riscv qemu virt support , add cmake toolchain script to generate libthreadx.a
• fix riscv64 contex_resotre bug (when f/d isa is enable)
• use weak symbol to invalidate _tx_initialize_low_level function

[fdesbiens]

Hi @Jer6y.

Thank you for your contribution! I am the new Eclipse ThreadX project lead. I am still ramping up, so I couldn't comment right away. I appreciate your patience.

I lack the knowledge and experience to review the code thoroughly myself, so I will do my best to get someone else to look at it in the upcoming weeks. In the meantime, I am curious about the history of this contribution. What led you to write this port? Feel free to contact me privately if you cannot share those details publicly.

[fdesbiens]

@eclipse-threadx/iot-threadx-committers, I need a volunteer with porting expertise to review this contribution.

[Jer6y]

Hi @Jer6y.

Thank you for your contribution! I am the new Eclipse ThreadX project lead. I am still ramping up, so I couldn't comment right away. I appreciate your patience.

I lack the knowledge and experience to review the code thoroughly myself, so I will do my best to get someone else to look at it in the upcoming weeks. In the meantime, I am curious about the history of this contribution. What led you to write this port? Feel free to contact me privately if you cannot share those details publicly.

Hi,
I am working on this porting task because I found that I can't directly use the ThreadX project on RISC-V. There are some issues with the code in terms of architecture code, and I can't find the way to run ThreadX on qemu-system-riscv64 for verification and learning.

[fdesbiens]

@rahmanih I think you mentioned you have feedback for the author of this pull request. Can you please share it with them here?

[rahmanih]

@rahmanih I think you mentioned you have feedback for the author of this pull request. Can you please share it with them here?

Hi,
I misunderstood some points, but it is clear now, LGTM, if no more comments, these can be merged.
regards
Haithem.

[fdesbiens]

@eclipse-threadx/iot-threadx-committers

@rahmanih Reviewed this contribution and determined it meets our quality standards.

I would like all the others to explicitly approve (+1) or reject (-1) this contribution. Please express your opinion by Tuesday, February 11, 2025. I will not vote myself unless there is a tie.

If the vote is positive, I will merge the code and this feature will ship with our next release.

[billlamiework]

+1

[fdesbiens]

This contribution is approved. Thanks for submitting this PR, @Jer6y!

[fdesbiens]

This feature will ship in ThreadX v6.4.2. We expect to release it by the end of February 2025.