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A basic interrupt handler has been implemented which tracks the seconds
that have been elapsing along the way. Depending on the value of these
seconds, then a task has to be called.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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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>
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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>
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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>
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