boot_alt_app_shared.c
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/****************************************************************************
*
* Copyright (c) 2021 PX4 Development Team. All rights reserved.
* Author: David Sidrane <david.sidrane@nscdg.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#include <nuttx/config.h>
#if defined(SUPPORT_ALT_CAN_BOOTLOADER)
#include <stdint.h>
#include <string.h>
#include "chip.h"
#include "stm32.h"
#include <errno.h>
#include "boot_alt_app_shared.h"
#include <lib/systemlib/crc.h>
/****************************************************************************
* Name: bootloader_alt_app_shared_read
*
* Description:
* Based on the role requested, this function will conditionally populate
* a bootloader_alt_app_shared_t structure from the physical locations used
* to transfer the shared data to/from an application (internal data) .
*
* The functions will only populate the structure and return a status
* indicating success, if the internal data has the correct signature as
* requested by the Role AND has a valid crc.
*
* Input Parameters:
* shared - A pointer to a bootloader_alt_app_shared_t return the data in if
* the internal data is valid for the requested Role
* role - An eRole_t of App or BootLoader to validate the internal data
* against. For a Bootloader this would be the value of App to
* read the application passed data.
*
* Returned value:
* OK - Indicates that the internal data has been copied to callers
* bootloader_alt_app_shared_t structure.
*
* -EBADR - internal data was not valid. The copy did not occur.
*
****************************************************************************/
__EXPORT int bootloader_alt_app_shared_read(bootloader_alt_app_shared_t *alt_shared)
{
int rv = EBADR;
bootloader_alt_app_shared_t *bootloader_alt_app_shared = (bootloader_alt_app_shared_t *)&_sapp_bl_shared;
if (bootloader_alt_app_shared->signature == BL_ALT_APP_SHARED_SIGNATURE) {
*alt_shared = *bootloader_alt_app_shared;
rv = 0;
}
return rv;
}
/****************************************************************************
* Name: bootloader_alt_app_shared_write
*
* Description:
* Based on the role, this function will commit the data passed
* into the physical locations used to transfer the shared data to/from
* an application (internal data) .
*
* The functions will populate the signature and crc the data
* based on the provided Role.
*
* Input Parameters:
* shared - A pointer to a bootloader_alt_app_shared_t data to commit to
* the internal data for passing to/from an application.
* role - An eRole_t of App or BootLoader to use in the internal data
* to be passed to/from an application. For a Bootloader this
* would be the value of Bootloader to write to the passed data.
* to the application via the internal data.
*
* Returned value:
* None.
*
****************************************************************************/
__EXPORT void bootloader_alt_app_shared_write(bootloader_alt_app_shared_t *alt_shared)
{
bootloader_alt_app_shared_t *bootloader_alt_app_shared = (bootloader_alt_app_shared_t *)&_sapp_bl_shared;
*bootloader_alt_app_shared = *alt_shared;
bootloader_alt_app_shared->signature = BL_ALT_APP_SHARED_SIGNATURE;
}
/****************************************************************************
* Name: bootloader_app_shared_invalidate
*
* Description:
* Invalidates the data passed the physical locations used to transfer
* the shared data to/from an application (internal data) .
*
* The functions will invalidate the signature and crc and shoulf be used
* to prevent deja vu.
*
* Input Parameters:
* None.
*
* Returned value:
* None.
*
****************************************************************************/
__EXPORT void bootloader_alt_app_shared_invalidate(void)
{
bootloader_alt_app_shared_t *bootloader_alt_app_shared = (bootloader_alt_app_shared_t *)&_sapp_bl_shared;
bootloader_alt_app_shared->signature = 0;
}
#endif