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efi: Move grub_reboot() into kernel

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The reboot function calls machine_fini() and then reboots the system.
Currently it lives in lib/ which means it gets compiled into the
reboot module which lives on the heap.

In a following patch, I want to free the heap on machine_fini()
though, so we would free the memory that the code is running in. That
obviously breaks with smarter UEFI implementations.

So this patch moves it into the core. That way we ensure that all
code running after machine_fini() in the UEFI case is running from
memory that got allocated (and gets deallocated) by the UEFI core.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Alexander Graf 2017-08-31 16:40:18 +02:00 • committed by Vincent Batts
parent e8a9a2a1aa
commit e224ee31c0
4 changed files with 11 additions and 38 deletions
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3
include/grub/misc.h
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@ -396,7 +396,8 @@ grub_abs (int x)
}
/* Reboot the machine. */
#if defined (GRUB_MACHINE_EMU) || defined (GRUB_MACHINE_QEMU_MIPS)
#if defined (GRUB_MACHINE_EMU) || defined (GRUB_MACHINE_QEMU_MIPS) || \
defined (GRUB_MACHINE_EFI)
void EXPORT_FUNC(grub_reboot) (void) __attribute__ ((noreturn));
#else
void grub_reboot (void) __attribute__ ((noreturn));