Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Now the system can parse paths to files/directories.

It follows the same Unix standard namespace.

For now, only absolute paths are allowed.

The parse mechanism relies on the struct path_part. Which represents
each component on a single path.

All the components are chain-linked through path_part->next, where the
last path component will have ->next == NULL.

This also introduces path_root struct, which represents the root of
the path.

The first component, linked to path_root->head, is always the "/" component.

The disk_id represents the disk the root directory is found into. This
should actually (and likely will) be a mountpoint not a disk id.

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Also fix a off by one bug in strnlen

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

This is missing and will come in handy for path parsing.

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Enable the kernel to read from an ATA device

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Enable paging in the CPU and add some testing code to check
virtual addresses are being redirected.

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>

Add infra-structure to enable and manipulate page tables in the
processor.

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>