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If the machine has network cards found, but there are no tcp open sockets (because the user doesn't use the network to boot), then grub_net_tcp_retransmit() should be a noop. Thus GRUB doesn't need to call grub_get_time_ms(), which does a call into firmware on powerpc-ieee1275, and probably other targets. So only call grub_get_time_ms() if there are tcp sockets. Aside from improving performance, its also useful to stay out of the firmware as much as possible when debugging via QEMU because its a pain to get back in to GRUB execution. grub_net_tcp_retransmit() can get called very frequently via grub_net_poll_cards_idle() when GRUB is waiting for a keypress (grub_getkey_noblock() calls grub_net_poll_cards_idle()). This can be annoying when debugging an issue in GRUB on PowerPC in QEMU with GDB when GRUB is waiting for a keypress because interrupting via GDB nearly always lands in the OpenBIOS firmware's milliseconds call. Signed-off-by: Glenn Washburn <development@efficientek.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'