initrd support

[Samuel Thibault]

Hello,

Back again with the initrd support question.  There were several
proposals which at least somebody doesn't like:

- introduce ramdisk devices in Mach. Not considered as hurdish, would
  need the addition of a device command to release the memory.
- somehow link the ramdisk into ext2fs itself, or a storeio task. This
  makes it harder to tinker with the image, since mounting/unmounting it
  is not enough any more, one has to relink.

A hybrid solution could be the following:

module --nounzip /boot/initrd.gz '$(initrd-task=data-task-create)'
module /boot/kernel/ext2fs.static ext2fs ... -T typed gunzip:task:${initrd-task}

data-task-create being a script command which creates a task whose only
content is the initrd content, starting at vaddr 0. ext2fs can then peek
the data from the task, and possibly destroy it if e.g. using taskonce:
instead of task:

What do people think about it?

Samuel