[d0iasm]

Thanks for your interest! I'm an author of this book. This book is very beginning as you mentioned and I'm still working on it.

I already succeeded to run xv6 in my RISC-V emulator and wrote a blog post "Made a RISC-V Emulator Running Xv6": https://d0iasm.github.io/blog/risc-v/2020/04/03/xv6-on-my-ri...

I have 2 different RISC-V emulators and its goals are different:

rvemu (https://github.com/d0iasm/rvemu): Can run xv6. It's trying to support Linux and make it faster in the future.

rvemu-for-book (https://github.com/d0iasm/rvemu-for-book): Reference implementation for the book. Simpler than original one.

[mrlonglong]

What does opcode 0x41 does? It's stopping the emulator when I try to run it on fib.text. Otherwise it's a pretty decent tutorial. I've also been following Stephen Marz's tutorial on bringing up a basic operating system on RiscV 64, going to use the two together.

[seusscat]

Could you please elaborate on what the differences between the two implementations are?

[d0iasm]

The main difference between them is the number of instructions are supported. Rvemu supports RV64GC, while rvemu-for-book will support RV64I and instructions that xv6 uses (e.g. mul).

Also rvemu will support a device tree but rvemu-for-book won't.