Add a BOTAN_FN_ISA flag for CPU RNG function #5229
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This seems to be needed for ARMv8.5 RNG support (#5228)
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Pull request overview
This PR refactors the ISA (Instruction Set Architecture) specification for the processor RNG functionality from module-level declarations to function-level annotations. This change is preparatory work for adding ARMv8.5 RNG support in a future update.
Changes:
- Introduced
BOTAN_FN_ISA_RNGmacro definitions for x86 (rdrand) and PowerPC (power9) architectures - Applied the new macro to the
read_hwrngfunction in processor_rng.cpp - Removed the module-level ISA specification from info.txt in favor of function-level annotations
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| src/lib/utils/isa_extn.h | Added BOTAN_FN_ISA_RNG macro definitions for x86 (rdrand) and PPC (power9) architectures |
| src/lib/rng/processor_rng/processor_rng.cpp | Added include for isa_extn.h and applied BOTAN_FN_ISA_RNG macro to read_hwrng function |
| src/lib/rng/processor_rng/info.txt | Removed the module-level ISA specification section, migrating to function-level annotations |
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mikatammi
approved these changes
Jan 11, 2026
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This seems to be needed for ARMv8.5 RNG support (#5228)