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Introduce new bit to mark ROM as non-executable

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This is dynamically set by hw in system_mode_ctrl. ROM will reset to
executable, but will be marked as non-executable as soon as we are no
longer executing in ROM, like system_mode.

ROM will be marked as executable again, if function calls are made to
either `syscall_addr_reg` or `blake2s_addr_reg`. Set reset value of
`blake2s_addr_reg` to an illegal address, halting the CPU if it is
called unset.

The blake2s function is 4-byte aligned, to ensure the cpu_addr is is
aligned with the address in the register.

Co-authored-by: Mikael Ågren <mikael@tillitis.se>
This commit is contained in:
Daniel Jobson 2024-11-15 09:28:01 +01:00
parent 9062b49804
commit 690bb53267
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GPG key ID: 3707A9DBF4BB8F1A
2 changed files with 81 additions and 38 deletions
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2
hw/application_fpga/fw/tk1/blake2s/blake2s.c
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@ -332,7 +332,7 @@ void blake2s_final(blake2s_ctx *ctx, void *out)
//------------------------------------------------------------------
// Convenience function for all-in-one computation.
//------------------------------------------------------------------
int blake2s(void *out, size_t outlen,
int __attribute__((aligned(4))) blake2s(void *out, size_t outlen,
const void *key, size_t keylen,
const void *in, size_t inlen,
blake2s_ctx *ctx)