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* Accept tasks as a parameter on initrd extractionMiquel Sabaté Solà2024-11-241-5/+8
| | | | | | This allows this functionality to be properly extracted for unit tests. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* kernel: Remove old code from initrd.cMiquel Sabaté Solà2024-11-241-36/+15
| | | | | | | And for the first time I saw this whole thing working with optimizations on :) Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Simplify the entry address computationMiquel Sabaté Solà2024-11-241-2/+3
| | | | | | | We actually don't need to preserve the initially computed base address for each binary, but we can just preserve the final entry address. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Simplify scheduling by introducing an init processMiquel Sabaté Solà2024-11-241-1/+3
| | | | | | | | | | | | | | | | Scheduling is easier if there is an init process which does nothing. This way we don't have to perform hacks in order to idle in S privilege mode while touching special registers in weird ways. For now this process is kind of costly since 'wfi' is not accepted in this context, but this can be further tuned down in the future by setting TW=1 on 'mstatus', or by handling the exception and allowing it if it comes from the proper process. All of that being said, there is still work to be done as things fail when optimitzations are on. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Fix initrd parsing because of a path changeMiquel Sabaté Solà2024-11-221-7/+7
| | | | | | | | | | In commit 573a8c6b490a ("usr: Rename foo/bar to fizz/buzz") the path of the user-space binaries have changed. The `initrd` parsing code makes some decisions based on that naming, and so it needed to be updated as well. Fixes: 573a8c6b490a ("usr: Rename foo/bar to fizz/buzz") Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Add basic parsing for underlying ELF executablesMiquel Sabaté Solà2024-11-221-4/+36
| | | | | | | | | | | | | The given initrd is a CPIO archive of multiple ELF executables. We are already able to parse the CPIO archive to detect where each file is located, this commit adds the mapping for each ELF executable to the corresponding task_struct. Note that this is still heavily under construction, since we cannot simply jump into the entry point of an executable as we have not yet setup the proper layout from performing context switches. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Initial parsing of the provided initrd fileMiquel Sabaté Solà2024-11-211-0/+135
We expect a CPIO archive with the 'newc' format for the initrd. Parse this archive from the given initrd address and fetch the address for each ELF executable while also pairing which task correspond to which ELF. This commit leaves to do the actual parsing of the ELF file for each task, while also leaving some string utilities to be refined. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>