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doc: Update documentation about syscalls

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- Revise firmware implementation notes
- Document how to do fw syscalls
  - Document how to trigger a syscall function in the firmware, how to
    pass arguments, what the caller is responsible for and what is
    returned.
- Describe hardware syscall implementation
  - how the syscall interrupts are triggered,
  - the hardware privilege escalation,
  - the UDS protection.

Co-authored-by: Daniel Jobson <jobson@tillitis.se>
Co-authored-by: Michael Cardell Widerkrantz <mc@tillitis.se>
This commit is contained in:
Mikael Ågren 2025-02-26 07:03:56 +01:00
parent 7554787678
commit c52442b54c
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4 changed files with 161 additions and 120 deletions
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hw/application_fpga/core/uds/README.md
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@ -6,8 +6,7 @@ Unique Device Secret core
This core store and protect the Unique Device Secret (UDS) asset. The
UDS can be accessed as eight separate 32-bit words. The words can only
be accessed as long as the app_mode input is low, implying that the
CPU is executing the FW.
be accessed as long as the `en` input is high.
The UDS words can be accessed in any order, but a given word can only
be accessed once between reset cycles. This read once functionality is