fbos/kernel/dt.c, branch mainA RISC-V operating system devoted to running fizz/buzz processes.
https://git.mssola.com/os/fbos/atom?h=main2024-11-20T10:43:08ZFetch the initrd address from the DTB blob2024-11-20T10:43:08ZMiquel Sabaté Solàmikisabate@gmail.com2024-11-20T10:43:08Zurn:sha1:fb9627cc985912a57de8b4bedc98991e290e4075
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>
Setup the stack for an init task2024-11-19T14:05:59ZMiquel Sabaté Solàmikisabate@gmail.com2024-11-19T13:55:32Zurn:sha1:52a4afca71aee5c150c6c63e7c1a510501fce6f3
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>