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* string: Cleanup leading tabsMiquel Sabaté Solà2024-11-201-3/+3
| | | | Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Fetch the initrd address from the DTB blobMiquel Sabaté Solà2024-11-204-30/+49
| | | | | | | | | | The kernel entry has a pointer to the DTB blob as a parameter. From this pointer we can parse the the DTB blob to find the properties "chosen->linux,initrd-start" and "chosen->linux,initrd-start". These properties are guaranteed to have 64-bit addresses which point where the initrd is in memory, which we need to fetch the binaries to be loaded. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Check the return value from SBI ecallsMiquel Sabaté Solà2024-11-191-1/+4
| | | | Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Setup the stack for an init taskMiquel Sabaté Solà2024-11-197-9/+156
| | | | | | | | | | | | | | | | | 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>
* Bootstrap the projectMiquel Sabaté Solà2024-08-243-0/+70
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>