-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Actually, a correction to what I just said. A processor can return from protected mode to real mode. Read more here:
https://en.wikipedia.org/wiki/Protected_mode#Entering_and_exiting_protected_mode I don't know if GRUB supports this (I would assume not) but generally speaking it is still not possible to do what you want because the Linux kernel as far as I know does not have the functionality that would be required. If you want to try and do this, go ahead and attempt it, but the roadblocks will be so large that it probably is not worth trying, and just simply rebooting the machine is the best way to get to GRUB. If you tell us what are _trying_ to do, i.e what you need this functionality for, perhaps we can suggest an alternative way to achieve what you need. - -- SevenBits P.S: Since this topic is not about the development of GRUB, it probably doesn't belong in this list. Please consider posting to grub-users instead. On 05/18/2014 01:33 AM, Z C wrote: > If I boot into a linux kernel using a grub command like "linux > /vmlinuz; inirtd /initrd; boot", how do I shutdown linux itself > (but do not power off or reboot the computer hardware) and return > back to the grub directly? > > What I meant is something equivalent to the "exit" command in most > shells: If you are within one shell and you enter another shell, > then if you want to quit the second shell and return back to the > first shell, just simply type exit. All env variables and commands > you previous typed in the first shell are completely intact. > > Suppose I am now in the grub shell, and then I boot into a tiny > linux kernel, say, a busybox shell, then what can I do to exit the > second shell (i.e. busybox shell) and return to the first shell > (i.e. grub shell)? Of course I can enter the grub shell again by > simply rebooting the hardware, but this is not what I want. > > > > _______________________________________________ Grub-devel mailing > list Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTeOyJAAoJEFbRvtGxmFPEykoH/3cw/hYn+kdJLKrJeTh9SgJy +2z8KKbPgX5H71NqUUAN7bU5yE+AyAvVh2F8K9PAk1HxVFu3edGD6Wmr4DRnwY6m i9nS+gnq+5enS/9xj7LHtvuEm/6xbYJkI54i9U6EGYBR6gJneRkd2yoJqmJsKUum eh7TIjTmrXPW6Kd2ZcoO7GyR/hjR+GWNDQRJeaVmj2wlZM00et+ei3AXzpvOzJ3l 9IOd3gkhkkt77DxYFPkxnJk7HtsHl1rnvqW4ct07ByzlFgCsFo8/ddbgEE6l6Zlm U1OvndApeofKoznXtNmrMpquHhqnTE9mr8asIua5962s9HdBkxPtHU+4a0VvBYw= =QTsj -----END PGP SIGNATURE----- _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
