hw/riscv/sifive_clint.c: avoid integer overflow in timecmp

[Fabien-Chouteau]

Writing a high value in timecmp leads to an integer overflow. This patch modifies the code to detect such case, and use the maximum integer value as the next trigger for the timer.

[jim-wilson]

I think this tree is not actively maintained anymore. If the clint support is upstream, then the patch should be submitted upstream. If the clint is not upstream, then we may want to create a sifive specific qemu tree to hold sifive specific patches before we upstream them, and then we can give multiple sifive people write access to that tree.

[Fabien-Chouteau]

Hi @jim-wilson ,

You mean the qemu-for-upstream branch of this repo?

[jim-wilson]

No, I mean https://www.qemu.org/contribute/

[Fabien-Chouteau]

Got it.

Thanks,