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Note an interrogation about integer value representation

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Especially 0 values may need special treatment since they can't be
used as an array size.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-11-23 12:31:38 +01:00
parent 6a530e8d26
commit 3ff79066b1
1 changed files with 13 additions and 0 deletions
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13
docs/proposed/psa-driver-interface.md
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@ -840,6 +840,19 @@ psa_set_key_lifetime(&attributes, PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION
## Open questions
### Value representation
#### Integers
It would be better if there was a uniform requirement on integer values. Do they have to be JSON integers? C preprocessor integers (which could be e.g. a macro defined in some header file)? C compile-time constants (allowing `sizeof`)?
This choice is partly driven by the use of the values, so they might not be uniform. Note that if the value can be zero and it's plausible that the core would want to statically allocate an array of the given size, the core needs to know whether the value is 0 so that it could use code like
```
#if ACME_FOO_SIZE != 0
uint8_t foo[ACME_FOO_SIZE];
#endif
```
### Driver declarations
#### Declaring driver entry points