[U-Boot] [PATCH 02/12] arm: include: Import unified.h from Linux kernel

[Tom Rini]

On Thu, May 26, 2016 at 06:01:37PM +0200, Marek Vasut wrote:

> Import unified.h from Linux kernel 4.4.6 , commit
> 0d1912303e54ed1b2a371be0bba51c384dd57326 . This header file contains
> macros used in libgcc functions in Linux kernel on ARM and will be
> needed for the libgcc sync.
> 
> Since unified.h defines the W(instr) macro, we must drop this from
> the macro from memcpy.S , otherwise this triggers a warning about
> symbol redefinition. In order to keep the changes to unified.h to
> the minimum, tweak arch/arm/lib/Makefile such that it defines the
> CONFIG_ARM_ASM_UNIFIED macro, which places .syntax unified into all
> of the assembler files. This is mandatory.
> 
> Moreover, for Thumb2 build, define CONFIG_THUMB2_KERNEL macro if and
> only if Thumb2 build is enabled. This macro is checked by unified.h
> and toggles between ARM and Thumb2 variant of the instructions in the
> assembler source files.
> 
> Finally, this patch defines __LINUX_ARM_ARCH__=N macro based on the
> new CONFIG_SYS_ARM_ARCH Kconfig option. This macro selects between
> more optimal and more dense codepaths which work on armv5 and newer
> and less optimal codepaths which work on armv4 and possible armv3m.
> Tegra2 needs the same special handling as it does in arch/arm/Makefile
> to cater for the arm720t boot core.
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Albert Aribaud <albert.u.boot at aribaud.net>
> Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Tom Rini <trini at konsulko.com>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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