ACTIVE - Kernel with migrating threads as IPC https://metanimi.dy.fi/cgit/kmi/atom?h=master 2024-07-17T19:02:47Z 2024-07-17T19:02:47Z Kimplul kimi.h.kuparinen@gmail.com 2024-07-17T19:02:47Z urn:sha1:1a0d61b33c2365cf413bf584289058d0d9097377 + At least by my standards. Some amount of scripting going on, but should still be fine. Effectively, source.mk contains information to build the test, check.mk checks the generated log from running the test. As a results, check.mk should output OK into reports/$TEST/OK if everything went well, and anything else otherwise. The user can then look at reports/$TEST/log to see what went wrong. I expect to add some more features, such as starting QEMU with gdb and running a single test a bit easier than right now (same limitation as in the top level makefile, i.e. you have to specify make -f scripts/makefile $TEST from within `tests` and you must have ran `make check` at that point so that `tests.mk` is fully generated. Not huge issues, but slightly annoying, somewhat unsure how to work around them properly but we'll see. 2024-07-17T16:29:37Z Kimplul kimi.h.kuparinen@gmail.com 2024-07-17T16:29:37Z urn:sha1:be82edec47b20164c0e8a9917fa2c9b8b9999fdf 2024-07-08T15:04:03Z Kimplul kimi.h.kuparinen@gmail.com 2024-07-08T14:43:59Z urn:sha1:e134202611a50b358c147c92bfb8a7f443030b8b + Anything extern is right out as LLVM doesn't produce correct code for them. Maybe if I added some extra attributes but I'm skeptical. Replaced with static variables and getters/setters. + Inline ASM is apparently a bit buggy, so use an assembly stub when jumping to init. + Minimize work done in main() to minimize chance of LLVM doing something silly. Still not 100% certain that I shouldn't just write the main() as an assembly stub in arch/riscv64 to be absolutely sure everything works as intended. + Make .kernel.start section SHF_ALLOC, otherwise lld complains about pc-relative addressing Probably some other stuff as well that I'm forgetting right now. But at least with LLVM14 LTO seems to work, which is pretty cool? 2024-07-05T16:38:11Z Kimplul kimi.h.kuparinen@gmail.com 2024-07-05T16:38:11Z urn:sha1:e09edb5d54e39bd9509a1dc450df5ab320759f97 + Took some fairly significant changes, for one the kernel is no longer relocated at the start of a boot, instead it sits wherever the user decides the kernel should sit. Similarly, the initial kernel stack and page table are stored within the binary, slightly bloating the size but making it much safer to boot since there's really no chance of us overwriting the fdt or initrd in memory. 2024-07-04T21:03:59Z Kimplul kimi.h.kuparinen@gmail.com 2024-07-04T21:02:53Z urn:sha1:98f21e694a6b0964d6d08196cb6bfbc1c2ae2ff4 + Compiling for size emits memcpy() calls after they've already been removed by LTO, so add __used attribute to counteract this. Newer versions of GCC seem to prefer `-flto=auto` to just `-flto`, so use that. printf format %d -> %ld 2023-07-24T16:26:07Z Kimplul kimi.h.kuparinen@gmail.com 2023-07-24T16:23:50Z urn:sha1:fdfdd03e3341d3b7d5e6a22a11a755a2c56eda1b + First part generates deps.mk, second part reads it. Allows us to use both bmake and gmake with the same makefiles. Only drawback seems to be that the first makefile considers all individual files as 'finished' targets, meaning that it's more difficult to do something like make kernel.elf though I haven't found this to be an issue.