Timer event to keep grub msec counter was running at 1000HZ. This was too
fast for UEFI timer driver and resulted in a 10x slowdown in grub time
versus wallclock. Reduce the timer event frequency and increase tick
increment accordingly to keep better time.

The current code for EFI grub_exit() calls grub_efi_fini() before
returning to firmware. In the case of ARM, this leaves a timer
event running which could lead to a firmware crash. This patch
changes this so that grub_machine_fini() is called with a NORETURN
flag. This allows machine-specific shutdown to happen as well
as the shutdown done by grub_efi_fini().
Signed-off-by: Mark Salter <msalter@redhat.com>

Use the new thumb_get_instruction_word/thumb_set_instruction_word
helpers throughout.

Style cleanup (missing spaces).

Move Thumb MOVW/MOVT handlers into Thumb relocation section of file.

libgcc for boot environment isn't always present and compatible.
libgcc is often absent if endianness or bit-size at boot is different
from running OS.
libgcc may use optimised opcodes that aren't available on boot time.
So instead of relying on libgcc shipped with the compiler, supply
the functions in GRUB directly.
Tests are present to ensure that those replacement functions behave the
way compiler expects them to.

Previously we supplied only unsigned divisions on platforms that need software
division.
Yet compiler may itself use a signed division. A typical example would be a
difference between 2 pointers which involves division by object size.

GCC 4.9 also generates R_ARM_THM_MOVW_ABS_NC and R_ARM_THM_MOVT_ABS,
as an alternative to ABS32.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>

The unaligned local in __aeabi_uidivmod leads to a store to a 64bit
value at an address that is not divisible by 8 (in grub_divmod64).
The compiler most likely generates a STRD instruction to store it and
this causes an exception.

Fixes Savannah bug #43632.

This includes improvements done by Leif Lindholm.

	As these functions are used on pre-ARMv6 CPUs as well we don't want
	to make assembler assume that architecture is higher than default one.

	Without it the port is reidiculously slow.

	More code was converted from ASM to C for easier handling.

	algorithm on v5.

	Suggested by: Leif Lindholm.

	Shouldn't matter for armv >= 5 but let's be safe.

	Move more code to common dl.c. Add missing veneers for arm and arm64.
	Decreases kernel size by 70 bytes on i386-pc (40-50 compressed)

	compiling to thumb2.
	* grub-core/kern/arm/cache_armv7.S: Likewise.
	* grub-core/lib/arm/setjmp.S: Likewise.

Commit c9cd02c9 broke the u-boot syscall API for va_args that spill over
to the stack, causing the disk support to stop working. This patch
resolves the problem, while keeping the new, cleaner transition_space
handling.

	clang (not necessarry with -no-integrated-as).
	* include/grub/symbol.h [__arm__]: Likewise.

	* grub-core/kern/arm/cache_armv6.S: ... here. This allows this
	asm to stay in arm even if surrounding is thumb.

	helper functions are needed for thumb.

	literal load.
	(grub_uboot_syscall): Save/restore r9 and align stack.

	occurencies with END.

This reverts commit 286551b4.

	compiling with clang.

	".".

	=x with ADDR(x) in arm assembly.
	(END): New macro. Replace all .end with END.

	Reported by: Glenn Washburn.

	link with libgcc.

	R_ARM_V4BX.