[U-Boot] [PATCH v2 4/6] arm: omap5: Add TEE loading support

[Tom Rini]

On Tue, Nov 29, 2016 at 01:03:37PM -0600, Andrew F. Davis wrote:

> From: Harinarayan Bhatta <harinarayan at ti.com>
> 
> secure_tee_install is used to install and initialize a secure TEE OS such as
> Linaro OP-TEE into the secure world. This function takes in the address
> where the signed TEE image is loaded as an argument. The signed TEE image
> consists of a header (struct tee_header), TEE code+data followed by the
> signature generated using image signing tool from TI security development
> package (SECDEV). Refer to README.ti-secure for more information.
> 
> This function uses 2 new secure APIs.
> 
> 1. PPA_SERV_HAL_TEE_LOAD_MASTER - Must be called on CPU Core 0. Protected
>    memory for TEE must be reserved before calling this function. This API
>    needs arguments filled into struct ppa_tee_load_info. The TEE image is
>    authenticated and if there are no errors, the control passes to the TEE
>    entry point.
> 
> 2. PPA_SERV_HAL_TEE_LOAD_SLAVE - Called on other CPU cores only after
>    a TEE_LOAD_MASTER call. Takes no arguments. Checks if TEE was
>    successfully loaded (on core 0) and transfers control to the same TEE
>    entry point.
> 
> The code at TEE entry point is expected perform OS initialization steps
> and return back to non-secure world (U-Boot).
> 
> Signed-off-by: Harinarayan Bhatta <harinarayan at ti.com>
> Signed-off-by: Andrew F. Davis <afd at ti.com>
[snip]
> +/* TEE header (From OPTEE) */
> +struct tee_header {
> +	u32 magic;
> +	u8 version;
> +	u8 arch;
> +	u16 flags;
> +	u32 init_size;
> +	u32 loadaddr_hi;
> +	u32 loadaddr_lo;
> +	u32 init_mem_usage;
> +	u32 paged_size;
> +};

This, and anything else that's OPTEE specific should go in a more
generically visible header as others will be doing OPTEE stuff too.

[snip]
> +	if ((hdr->magic != 0x4554504f) ||

This too probably belongs in the generic OPTEE header.

> +	/* The return value is ignored. If something went wrong, the function
> +	 * would probably not return at all
> +	 */
> +	(void)secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info);

"probably".  We must save and check the return value all the same.

-- 
Tom
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