[U-Boot] [PATCH 2/6] armv8: Implement CONFIG_SYS_MALLOC_F_LEN support

[FengHua]

hi Thierry,

> -----Original Messages-----
> From: "Thierry Reding" <thierry.reding at gmail.com>
> Sent Time: 2015-03-20 19:47:49 (Friday)
> To: u-boot at lists.denx.de
> Cc: "Marc Zyngier" <marc.zyngier at arm.com>
> Subject: [U-Boot] [PATCH 2/6] armv8: Implement CONFIG_SYS_MALLOC_F_LEN support
> 
> From: Thierry Reding <treding at nvidia.com>
> 
> Implement early malloc() support in a similar way as on 32-bit ARM. This
> is required for 64-bit Tegra SoCs that initialize from the device tree
> just like the earlier 32-bit SoCs.
> 
> Cc: Albert Aribaud <albert.u.boot at aribaud.net>
> Cc: Marc Zyngier <marc.zyngier at arm.com>
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
>  arch/arm/include/asm/config.h |  4 ----
>  arch/arm/lib/crt0_64.S        | 16 ++++++++++++++--
>  2 files changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
> index be80434dee4d..7a34a0186cb1 100644
> --- a/arch/arm/include/asm/config.h
> +++ b/arch/arm/include/asm/config.h
> @@ -7,10 +7,6 @@
>  #ifndef _ASM_CONFIG_H_
>  #define _ASM_CONFIG_H_
>  
> -#ifdef __aarch64__
> -#define CONFIG_SYS_GENERIC_GLOBAL_DATA
> -#endif
> -
>  #define CONFIG_LMB
>  #define CONFIG_SYS_BOOT_RAMDISK_HIGH
>  
> diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S
> index 77563967e517..010efdbf8f3f 100644
> --- a/arch/arm/lib/crt0_64.S
> +++ b/arch/arm/lib/crt0_64.S
> @@ -62,9 +62,21 @@ ENTRY(_main)
>   * Set up initial C runtime environment and call board_init_f(0).
>   */
>  	ldr	x0, =(CONFIG_SYS_INIT_SP_ADDR)
> +	mov	x1, x0
>  	sub	x0, x0, #GD_SIZE	/* allocate one GD above SP */
> -	bic	sp, x0, #0xf	/* 16-byte alignment for ABI compliance */
> -	mov	x18, sp			/* GD is above SP */
> +	bic	x0, x0, #0xf		/* 16-byte alignment for ABI compliance */
> +	mov	x18, x0			/* GD is above SP */
> +	mov	sp, x0
> +clr_gd:
> +	str	xzr, [x0], #8
> +	cmp	x0, x1
> +	b.lo	clr_gd
> +#if defined(CONFIG_SYS_MALLOC_F_LEN)
> +	ldr	x0, =CONFIG_SYS_MALLOC_F_LEN
> +	sub	x0, sp, x0
> +	str	x0, [x18, #GD_MALLOC_BASE]
sp should substract CONFIG_SYS_MALLOC_F_LEN also.
Actually my previous patch did the same work, but got no reply.

> +#endif
> +3:
>  	mov	x0, #0
>  	bl	board_init_f
>  
> -- 
> 2.3.2
> 
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