kmi - ACTIVE - Kernel with migrating threads as IPC

Age	Commit message (Collapse)	Author
2023-08-04	add initial smp bringup	Kimplul

2023-07-27	use nifty variable argument count trick	Kimplul
	+ Found it in newlib. This allows the compiler to more effectively optimize away unnecessary register operations. Applied to both kernel and init.c for a slight speed increase. I really should move init.c to some other repository though, the binary files are starting to get annoying
2023-07-27	add ipc_kick	Kimplul
	+ Tests will have to come later
2023-06-05	give compiler more room to optimize rpc invocation	Kimplul
	+ Try to write arguments to memory as fast as possible to free up some registers that the compiler can then play with. Qemu runs ~1 700 000 rpc's per second, visionfive2 @1GHz (I think) ~800 000.
2023-06-04	add some docs about visionfive2	Kimplul

2023-06-04	visionfive2 boots until debugging is initialized	Kimplul

2023-05-29	start trying to boot on visionfive 2	Kimplul
	+ Not bootable quite yet. Among other things, I couldn't get the current starfive u-boot fork to boot, so try adding support for booting with precompiled u-boot via the `go` command. Initial testing with qemu shows that this should be possible, and if it works, might be useful in the (far) future with other slightly janky SBCs. Also, NS16550 is 8250-based, and I'm really only using the base 8250, so rename and add visionfive 2 uart to list of compatibles. Visionfive 2 is still completely untested.
2023-05-12	fix LLVM compilation	Kimplul
	+ RELEASE=1 doesn't work for some reason, though
2023-05-11	arbitrary load address and RAM base detection	Kimplul
	+ Both kind of go hand in hand, made sense to do both at the same time. Some parts feel slightly hacky, the loader works by placing everything on the stack and avoiding global values. Still, seems to work?
2023-05-01	update license stuff	Kimplul

2023-04-30	rename to kmi	Kimplul

2023-01-26	add req_page syscall	Kimplul

2022-12-02	initial shared memory working	Kimplul

2022-12-01	start looking into memory handling	Kimplul
	+ Now 10M alloc/frees succeed, which totals more memory than the virtual machine has, so no too obvious leaks are occuring. For future debugging speed, changed 10M to 1M. + Also quick fix to rpcs, stacks are now assigned. Not entirely sure why they worked before this, but good that I found it.
2022-11-13	improve documentation on new features	Kimplul

2022-11-13	write init more sensibly	Kimplul
	+ Both easier to look at and now the userspace doesn't play as big of a role in the 'benchmarking' with optimizations turned on.
2022-11-12	make 'performance' results more accurate in qemu	Kimplul

2022-11-12	initial rpc implementations	Kimplul

2022-11-11	less buggy fork	Kimplul
	+ Not strictly done yet, but we can swap between two processes :D
2022-11-10	initial implementation of process copying	Kimplul
	+ Not actually working (at least fully), need to continue debugging when I have time.
2022-09-15	change syscalls to take 5 params and return 6	Kimplul
	+ In total, a syscall is built up of 6 values, with the first being the syscall number. Symmetrically, the first value is now a status and the following five values return "values". This allows us to cram in more info into the ipc_* functions. The performance difference is absolutely minimal, at least from my testing in qemu.
2022-09-15	add SYS_TICKS	Kimplul

2022-09-14	add putch syscall for easier userspace debugging	Kimplul
	+ Note that it is NOT intended for end user usage, just for debugging.
2022-09-14	riscv32 boots and advances as far as riscv64	Kimplul

2022-09-11	change external directory structure	Kimplul
	+ Prepare for possibly testing rv32 + Also remove newline from debugging output
2022-09-11	allow building with riscv64-linux-gnu	Kimplul
	+ May warn about PHDR not being in LOAD, there is a flag to silence it (--no-warn-rwx-segment) but it doesn't seem to exist in riscv64-unknown-elf for some reason.
2022-09-02	reserve more space for fw	Kimplul
	+ Doesn't seem to be specified anywhere, but I'll stick with 2MB for now, working on the assumption that the FW is at the start of the physical RAM. Possible TODOs: generate apos.its automatically from init.elf, allocate root_branch statically?
2022-06-12	add license texts	Kimplul

2022-04-29	continue building base for irq handling	Kimplul

2022-04-24	start initial irq handling	Kimplul
	+ Still lots todo, and I'm not entirely sure how I should handle program space switches (mainly since the kernel uses the process' stack, maybe it shouldn't?)
2022-01-07	Allow building with clang	Kimplul
	+ Release mode is sort of broken, as lto doesn't work with linker relaxation and turning the relaxation off causes issues with the jump from init to kernel (as I've currently implemented it, could probably be fixed with a manual jump from assembly, I'll add it to my TODO list)