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

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Hello Ahmad,

thanks for the fast review. I'll make the suggested changes and post a
V2 (most likely) tomorrow.

Best regards

Christian

On 13/07/2020 15:36, Ahmad Fatoum wrote:
> Hello Christian,
> 
> On 7/13/20 2:03 PM, 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`.
>> ---
>>  arch/arm/mach-layerscape/ppa.c |  3 +-
>>  common/bootm.c                 |  7 ++--
>>  common/image-fit.c             | 61 +++++++++++++++++++++++++++++++++-
>>  include/image-fit.h            |  3 +-
>>  4 files changed, 68 insertions(+), 6 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..40ee6d0d8 100644
>> --- a/common/image-fit.c
>> +++ b/common/image-fit.c
>> @@ -517,12 +517,43 @@ 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)
>> +{
>> +	int ret = 0;
>> +	uint64_t value64;
>> +	uint32_t value32;
>> +
>> +	if (sizeof(*addr) == sizeof(value64)) {
>> +		ret = of_property_read_u64(image, property, &value64);
>> +		if (ret == 0) {
>> +			*addr = value64;
>> +		} else if (ret == -EOVERFLOW) {
>> +			ret = of_property_read_u32(image, property, &value32);
>> +			if (ret == 0) {
>> +				*addr = value32;
>> +			}
>> +		}
>> +	} else if (sizeof(*addr) == sizeof(value32)) {
>> +		ret = of_property_read_u32(image, property, &value32);
>> +		if (ret == 0) {
>> +			*addr = value32;
>> +		}
>> +	} else {
>> +		ret = -ENOTSUPP;
>> +	}
>> +
>> +	return ret;
> 
> You can make this more concise by calling of_read_number yourself:
> 
> const __be32 *cell;
> int len = 0;
> 
> cell = of_get_property(image, property, &len);
> if (!cell)
> 	return -EINVAL;
> if (len > sizeof(unsigned long))
> 	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
>> @@ -532,11 +563,16 @@ 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)";
>> @@ -573,6 +609,29 @@ int fit_open_image(struct fit_handle *handle, void *configuration,
>>  		return -EINVAL;
>>  	}
>>  
>> +	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;
>> +		} else {
>> +			pr_info("load: 0x%08lx\n", *load);
> 
> Fold this pr_info and the next into the already existing one?
> That way, we don't print 3 separate lines every time.
> 
>> +		}
>> +	}
>> +
>> +	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;
>> +			pr_info("entry: 0x%08lx\n", *entry);
>> +		}
>> +	}
>> +
>>  	if (conf_node)
>>  		ret = fit_verify_hash(handle, image, data, data_len);
>>  	else
>> 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);
>>  
>>
> 

-- 
--------------------------------------------
embedded brains GmbH
Herr Christian Mauderer
Dornierstr. 4
D-82178 Puchheim
Germany
email: christian.mauderer@xxxxxxxxxxxxxxxxxx
Phone: +49-89-18 94 741 - 18
Fax:   +49-89-18 94 741 - 08
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