Re: [PATCH v2] FIT: Parse `load` and `entry` addresses.

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hello Christian,

On 7/14/20 9:17 AM, Christian Mauderer wrote:
> According to the U-Boot documentation for the FIT file format, the load
> and entry have to be allways defined for a "kernel" or "standalone".
> But Barebox ignored the parameters. That changes with this patch.
> 
> For backward compatibility the default address is still used for images
> without `load` or `entry`.
> 
> Signed-off-by: Christian Mauderer <christian.mauderer@embedded-brains.de>
> ---
>  arch/arm/mach-layerscape/ppa.c |  3 +-
>  common/bootm.c                 |  7 +++--
>  common/image-fit.c             | 57 ++++++++++++++++++++++++++++++++--
>  include/image-fit.h            |  3 +-
>  4 files changed, 63 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/mach-layerscape/ppa.c b/arch/arm/mach-layerscape/ppa.c
> index 477e89478..3eb7ab641 100644
> --- a/arch/arm/mach-layerscape/ppa.c
> +++ b/arch/arm/mach-layerscape/ppa.c
> @@ -82,7 +82,8 @@ static int ppa_init(void *ppa, size_t ppa_size, void *sec_firmware_addr)
>  	}
>  
>  
> -	ret = fit_open_image(fit, conf, "firmware", &buf, &firmware_size);
> +	ret = fit_open_image(fit, conf, "firmware", &buf, &firmware_size,
> +			     NULL, NULL);
>  	if (ret) {
>  		pr_err("Cannot open firmware image in ppa FIT image: %s\n",
>  		       strerror(-ret));
> diff --git a/common/bootm.c b/common/bootm.c
> index 366f31455..94600cae3 100644
> --- a/common/bootm.c
> +++ b/common/bootm.c
> @@ -222,7 +222,7 @@ int bootm_load_initrd(struct image_data *data, unsigned long load_address)
>  		unsigned long initrd_size;
>  
>  		ret = fit_open_image(data->os_fit, data->fit_config, "ramdisk",
> -				     &initrd, &initrd_size);
> +				     &initrd, &initrd_size, NULL, NULL);
>  
>  		data->initrd_res = request_sdram_region("initrd",
>  				load_address,
> @@ -348,7 +348,7 @@ void *bootm_get_devicetree(struct image_data *data)
>  		unsigned long of_size;
>  
>  		ret = fit_open_image(data->os_fit, data->fit_config, "fdt",
> -				     &of_tree, &of_size);
> +				     &of_tree, &of_size, NULL, NULL);
>  		if (ret)
>  			return ERR_PTR(ret);
>  
> @@ -622,7 +622,8 @@ int bootm_boot(struct bootm_data *bootm_data)
>  		}
>  
>  		ret = fit_open_image(data->os_fit, data->fit_config, "kernel",
> -				     &data->fit_kernel, &data->fit_kernel_size);
> +				     &data->fit_kernel, &data->fit_kernel_size,
> +				     &data->os_address, &data->os_entry);
>  		if (ret)
>  			goto err_out;
>  	}
> diff --git a/common/image-fit.c b/common/image-fit.c
> index 2681d62a9..310013121 100644
> --- a/common/image-fit.c
> +++ b/common/image-fit.c
> @@ -517,12 +517,30 @@ int fit_has_image(struct fit_handle *handle, void *configuration,
>  	return 1;
>  }
>  
> +static int fit_get_address(struct device_node *image, const char *property,
> +			   unsigned long *addr)
> +{
> +	const __be32 *cell;
> +	int len = 0;
> +
> +	cell = of_get_property(image, property, &len);
> +	if (!cell)
> +		return -EINVAL;
> +	if (len > sizeof(*addr))
> +		return -ENOTSUPP;
> +	
> +	*addr = (unsigned long)of_read_number(cell, len / sizeof(*cell));
> +	return 0;
> +}
> +
>  /**
>   * fit_open_image - Open an image in a FIT image
>   * @handle: The FIT image handle
>   * @name: The name of the image to open
>   * @outdata: The returned image
>   * @outsize: Size of the returned image
> + * @load: The load address given by the image
> + * @entry: The entry address given by the image
>   *
>   * Open an image in a FIT image. The returned image is freed during fit_close().
>   * @configuration holds the cookie returned from fit_open_configuration() if
> @@ -532,14 +550,21 @@ int fit_has_image(struct fit_handle *handle, void *configuration,
>   * then only the hash is checked (because opening the configuration already
>   * checks the RSA signature of all involved nodes).
>   *
> + * The load address and entry point of the image description in the FIT will be
> + * parsed if they exist and if the @load and @entry parameters are not NULL.
> + * Otherwise @load and @entry won't be changed.
> + *
>   * Return: 0 for success, negative error code otherwise
>   */
>  int fit_open_image(struct fit_handle *handle, void *configuration,
>  		   const char *name, const void **outdata,
> -		   unsigned long *outsize)
> +		   unsigned long *outsize, unsigned long *load,
> +		   unsigned long *entry)
>  {
>  	struct device_node *image;
>  	const char *unit, *type = NULL, *desc= "(no description)";
> +	char load_str[sizeof("; load: 0x12345678")] = "";

Not big enough for sizeof(unsigned long) == 8

> +	char entry_str[sizeof("; entry (relative to load): 0x12345678")] = "";

Same

>  	const void *data;
>  	int data_len;
>  	int ret = 0;
> @@ -559,7 +584,35 @@ int fit_open_image(struct fit_handle *handle, void *configuration,
>  		return -ENOENT;
>  
>  	of_property_read_string(image, "description", &desc);
> -	pr_info("image '%s': '%s'\n", unit, desc);


> +
> +	if (load) {
> +		ret = fit_get_address(image, "load", load);
> +		if (ret < 0) {
> +			pr_info("Couldn't get load address in %s. Use default.\n", image->full_name);
> +			ret = 0;

You don't have to reset ret in between. I'd just skip this.

> +		}
> +	}
> +
> +	if (load && entry) {
> +		ret = fit_get_address(image, "entry", entry);
> +		if (ret < 0) {
> +			pr_info("Couldn't get entry point in %s. Use default.\n", image->full_name);
> +			ret = 0;
> +		} else {
> +			/* Barebox uses an entry relative to load but the FIT
> +			 * images assume an absolute entry. */
> +			*entry -= *load;
> +		}
> +	}
> +
> +	if (load) {
> +		snprintf(load_str, sizeof(load_str), "; load: 0x%08lx", *load);
> +	}

No { } for single expression blocks.

> +	if (load) {
> +		snprintf(entry_str, sizeof(entry_str),
> +			 "; entry (relative to load): 0x%08lx", *entry);
> +	}

This should be guarded by if (entry), but I'd prefer you drop this. See below

> +	pr_info("image '%s': '%s'%s%s\n", unit, desc, load_str, entry_str);

Could you use pr_info without a trailing \n and then use pr_cont to complete
the line?

>  
>  	of_property_read_string(image, "type", &type);
>  	if (!type) {
> diff --git a/include/image-fit.h b/include/image-fit.h
> index 27c9e8351..038732d0d 100644
> --- a/include/image-fit.h
> +++ b/include/image-fit.h
> @@ -31,7 +31,8 @@ int fit_has_image(struct fit_handle *handle, void *configuration,
>  		  const char *name);
>  int fit_open_image(struct fit_handle *handle, void *configuration,
>  		   const char *name, const void **outdata,
> -		   unsigned long *outsize);
> +		   unsigned long *outsize, unsigned long *load,
> +		   unsigned long *entry);
>  
>  void fit_close(struct fit_handle *handle);
>  
> 

-- 
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