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* Setup the stack for an init taskMiquel Sabaté Solà2024-11-191-7/+7
| | | | | | | | | | | | | | | | | Bootstrap an init task which holds at least the initial stack that is to be used when setting up the registers (such as `sp` and `tp`). In order to guarantee that the stack and the rest of the registers are set up correctly, this commit also provides a raw implementation of a `printk` function. Moreover, this commit also adds an argument that must be passed to `start_kernel`, which is the pointer to the embedded `fdt` blob. This argument will be used by later work so to fetch, at least, the base address for the initial ram disk. This was also used to test that the stack was working as expected. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* usr: Make sure usr/bin/ existsRicardo B. Marliere2024-11-191-0/+1
| | | | | | | | | Fix the following build error on a clean repository: riscv64-suse-linux-ld: cannot open output file usr/bin/foo: No such file or directory Fixes: d79436a1170e ("usr: Bootstrap the initramfs for the kernel") Signed-off-by: Ricardo B. Marliere <rbm@suse.com>
* usr: Bootstrap the initramfs for the kernelMiquel Sabaté Solà2024-11-181-10/+39
| | | | | | | | | Introduce a sample `foo` program which already calls the `write_and_block` system call which is yet to be implemented by this kernel. Moreover, the same CPIO format is used for the initramfs as with Linux, so we can pass it with QEMU without worries. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Load debug symbols on the gdb targetMiquel Sabaté Solà2024-09-241-11/+16
| | | | | | | | | | | Load the debug symbols into the gdb session by simply passing the executable file into gdb directly. Moreover, allow users of the gdb target to provide an extra variable so to pass extra flags to gdb. Moreover, this commit comes with other small cleanups on the Makefile, like a proper ABI specifier, Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Add CI jobMiquel Sabaté Solà2024-09-241-2/+6
| | | | | | | This will ensure that the code style is preserved and that commits being pushed at least build successfully. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Bootstrap the projectMiquel Sabaté Solà2024-08-241-0/+90
For now the base layout has been defined and we have a binary that is properly reached through openSBI. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>