Re: [PATCH 4/8] arm/cpu: Avoid multiple definitions of barebox_arm_entry

[Sascha Hauer <s.hauer@pengutronix.de>]

On Sun, Oct 11, 2015 at 11:43:37AM -0700, Andrey Smirnov wrote:
> All versions of barebox_arm_entry (in uncompress.c, start.c and
> start-pbl.c) appera to be doing exacty the same thing. So move the
> definition into a separate file and use IS_ENABLED macro to avoid
> re-definition.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
>  arch/arm/cpu/Makefile     |  4 ++--
>  arch/arm/cpu/entry.c      | 37 ++++++++++++++++++++++++++++++++++++
>  arch/arm/cpu/entry.h      | 48 +++++++++++++++++++++++++++++++++++++++++++++++
>  arch/arm/cpu/start-pbl.c  | 29 +---------------------------
>  arch/arm/cpu/start.c      | 27 +-------------------------
>  arch/arm/cpu/uncompress.c | 16 +---------------
>  6 files changed, 90 insertions(+), 71 deletions(-)
>  create mode 100644 arch/arm/cpu/entry.c
>  create mode 100644 arch/arm/cpu/entry.h
> 
> diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile
> index fb3929c..418bcab 100644
> --- a/arch/arm/cpu/Makefile
> +++ b/arch/arm/cpu/Makefile
> @@ -1,7 +1,7 @@
>  obj-y += cpu.o
>  obj-$(CONFIG_ARM_EXCEPTIONS) += exceptions.o
>  obj-$(CONFIG_ARM_EXCEPTIONS) += interrupts.o
> -obj-y += start.o setupc.o
> +obj-y += start.o setupc.o entry.o
>  
>  #
>  # Any variants can be called as start-armxyz.S
> @@ -23,7 +23,7 @@ AFLAGS_pbl-cache-armv7.o       :=-Wa,-march=armv7-a
>  pbl-$(CONFIG_CPU_32v7) += cache-armv7.o
>  obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
>  
> -pbl-y += setupc.o
> +pbl-y += setupc.o entry.o
>  pbl-$(CONFIG_PBL_SINGLE_IMAGE) += start-pbl.o
>  pbl-$(CONFIG_PBL_MULTI_IMAGES) += uncompress.o
>  
> diff --git a/arch/arm/cpu/entry.c b/arch/arm/cpu/entry.c
> new file mode 100644
> index 0000000..adc4aec
> --- /dev/null
> +++ b/arch/arm/cpu/entry.c
> @@ -0,0 +1,37 @@
> +#include <types.h>
> +#include <asm/cache.h>
> +
> +#include "entry.h"
> +
> +/*
> + * Main ARM entry point. Call this with the memory region you can
> + * spare for barebox. This doesn't necessarily have to be the full
> + * SDRAM. The currently running binary can be inside or outside of
> + * this region. TEXT_BASE can be inside or outside of this
> + * region. boarddata will be preserved and can be accessed later with
> + * barebox_arm_boarddata().
> + *
> + * -> membase + memsize
> + *   STACK_SIZE              - stack
> + *   16KiB, aligned to 16KiB - First level page table if early MMU support
> + *                             is enabled
> + *   128KiB                  - early memory space
> + * -> maximum end of barebox binary
> + *
> + * Usually a TEXT_BASE of 1MiB below your lowest possible end of memory should
> + * be fine.
> + */
> +
> +void __naked __noreturn barebox_arm_entry(unsigned long membase,
> +					  unsigned long memsize, void *boarddata)
> +{
> +	arm_setup_stack(membase + memsize - 16);
> +	arm_early_mmu_cache_invalidate();
> +
> +	if (IS_ENABLED(CONFIG_PBL_MULTI_IMAGES))
> +		uncompress_start_payload(membase, memsize, boarddata);
> +	else if (IS_ENABLED(CONFIG_PBL_SINGLE_IMAGE))
> +		__barebox_arm_entry(membase, memsize, boarddata);
> +	else
> +		__start(membase, memsize, boarddata);
> +}

I like the idea but I think to be exported the __barebox_arm_entry and
__start functions should get a more meaningful name.

Sascha

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