Kernel config (CONFIG_IKCONFIG) resolution for KPMs#275
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Add kernel-config resolution for KPMs. The engine exports one primitive, kpm_kconfig_get(key), returning an option's value (string options unquoted) or NULL when the option is unset, absent, or the kernel was built without CONFIG_IKCONFIG. Typed accessors (kpm_kconfig_bool/tristate/int/hex and the KPM_KCONFIG_* macros) are KPM-side inline wrappers, so the engine ABI stays a single symbol. Works for both embedded and runtime-loaded KPMs. - kptools: locate the gzipped ikconfig blob (find_ikconfig) and pass its kimg-relative offset/size through the preset (reserved bytes, no ABI break) and setup1.S into the runtime engine. - engine: vendored puff.c (zlib License) plus a small freestanding arm64 setjmp/longjmp shim decompress the blob on demand. - values are memoized in a process-wide, negative-cached table; the config is immutable so entries never expire and the blob is decompressed at most once per distinct key, shared across all modules. - add kpms/demo-kconfig example, build it in CI, and credit puff in README.
MhmRdd
changed the title
Keep the decompressed .config resident only while a module load phase is open, refcounted by kpm_kconfig_load_begin/end around each module init and the embedded-event batch. A burst of distinct-key lookups across one module, or a whole embedded batch loaded together, then shares a single decompression with no steady-state residency. The per-key value cache stays permanent, so repeated and post-init lookups never re-decompress.
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