Adds syscalls:
- ALLOCATE_AREA
- DEALLOCATE_AREA
- WRITE_DATA
- READ_DATA
and code to access the filesystem and the flash over SPI.
Based on original work by Daniel Jobson <jobson@tillitis.see> for
these files:
- auth_app.[ch]
- flash.[ch]
- spi.[ch]
- partition_table.[ch]
- rng.[ch]
- storage.[ch]
which are used with small changes to integrate with the new syscall
method.
Co-authored-by: Daniel Jobson <jobson@tillitis.se>
Co-authored-by: Mikael Ågren <mikael@tillitis.se>
In order to be able to leave data for firmware signalling the
intention with a reset or to leave data for the next app in a chain of
apps, we introduce a part of FW_RAM that can be used to store this
data. In order to do this, we:
- Change size of ROM from 6 KB to 8 KB.
- Change size of FW_RAM, from 2 KB to 4 KB.
- Add RESETINFO memory partition inside FW_RAM.
- Add generation of map file.
- Change CFLAGS from using -O2 to using -Os.
- Update address ranges for valid access to ROM and FW_RAM.
- Move stack to be located before data+bss and the RESETINFO data
above them. This also means we introduce hardware stack overflow
protection through the Security Monitor.
- Revise firmware README to the new use of FW_RAM.
We don't use any .data or .bss segment at all to keep all the firmware
variables in the stack in protected fw_ram.
Signed-off-by: Daniel Lublin <daniel@lublin.se>
