[U-Boot] api: bootelf: go: flush cache before starting

[Tom Rini]

On Mon, Dec 04, 2017 at 07:33:45PM +0100, Emmanuel Vadot wrote:

> From: Warner Losh <imp at freebsd.org>
> 
> Some application might load some code at location that contain stale
> cache entries. Before running a elf or raw binary, flush the caches
> if they are enabled.
> 
> Reviewed-by: Tom Rini <trini at konsulko.com>
> Signed-off-by: Emmanuel Vadot <manu at bidouilliste.com>
> ---
>  api/api.c  | 5 +++++
>  cmd/boot.c | 4 ++++
>  cmd/elf.c  | 5 +++++
>  3 files changed, 14 insertions(+)
> 
> diff --git a/api/api.c b/api/api.c
> index 7eee2fc083..853a3f7b0a 100644
> --- a/api/api.c
> +++ b/api/api.c
> @@ -290,6 +290,11 @@ static int API_dev_close(va_list ap)
>  	if (!err)
>  		di->state = DEV_STA_CLOSED;
>  
> +	if (dcache_status())
> +		flush_dcache_all();
> +	if (icache_status())
> +		invalidate_icache_all();
> +
>  	return err;
>  }
>  
> diff --git a/cmd/boot.c b/cmd/boot.c
> index 72f2cf362d..b66ae67fcb 100644
> --- a/cmd/boot.c
> +++ b/cmd/boot.c
> @@ -19,6 +19,10 @@ __attribute__((weak))
>  unsigned long do_go_exec(ulong (*entry)(int, char * const []), int argc,
>  				 char * const argv[])
>  {
> +	if (dcache_status())
> +		flush_dcache_all();
> +	if (icache_status())
> +		invalidate_icache_all();
>  	return entry (argc, argv);
>  }
>  
> diff --git a/cmd/elf.c b/cmd/elf.c
> index 5745a389da..5126c0e57d 100644
> --- a/cmd/elf.c
> +++ b/cmd/elf.c
> @@ -109,6 +109,11 @@ static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
>  {
>  	unsigned long ret;
>  
> +	if (dcache_status())
> +		flush_dcache_all();
> +	if (icache_status())
> +		invalidate_icache_all();
> +
>  	/*
>  	 * pass address parameter as argv[0] (aka command name),
>  	 * and all remaining args

We do not have these flushes on all architectures, so as is travis-ci
would fail, as does 'make tests'.  Thanks!

-- 
Tom
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