[PATCH 10/12] ARM: add early malloc support needed by the decompressor

[Sascha Hauer]

On Fri, Jul 27, 2012 at 08:33:08PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> This is not needed by lzo but by gunzip, xz and others.
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
>  arch/arm/cpu/start.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
> index a54f5fd..f500ca8 100644
> --- a/arch/arm/cpu/start.c
> +++ b/arch/arm/cpu/start.c
> @@ -28,6 +28,9 @@
>  #include <asm-generic/memory_layout.h>
>  #include <asm/sections.h>
>  
> +unsigned long free_mem_ptr;
> +unsigned long free_mem_end_ptr;
> +
>  #ifdef CONFIG_PBL_IMAGE
>  void __naked __section(.text_head_entry) pbl_start(void)
>  {
> @@ -193,6 +196,10 @@ void __naked __section(.text_ll_return) board_init_lowlevel_return(void)
>  	/* clear bss */
>  	memset(__bss_start, 0, __bss_stop - __bss_start);
>  
> +	/* set 128 KiB before the STACK_BASE - 16 address for early malloc */
> +	free_mem_ptr = STACK_BASE - 0x20000 - 16;
> +	free_mem_end_ptr = STACK_BASE - 16;
> +

This assumes that the malloc area is directly before the stack. How
about using __bss_stop or _end instead?

Sascha

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