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>

So far we've been playing a dangerous game... We enabled interrupts
before we actually had the interrupt descriptor table setup.

Fix this so we prevent IRQs to fire before the table is initialized
and attempt to run garbage instead of code

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

Add a simple API implementing a heap memory area.

This specifies 2 main data structures:
	struct heap - Defines a heap:
		Holds a table with all entries in the specific heap and
		the initial heap memory address

	struct heap_table - Describes the usage state of every PAGE
			    within the specific heap.

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

This is supposed to be compliand with POSIX

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

So far I just need a roundup routine to implement a basic heap manager

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