no1wudi opened a new pull request, #15396: URL: https://github.com/apache/nuttx/pull/15396
## Summary
This PR refactors the CPU index handling in the RISC-V architecture to be
based on the ARCH_RV_HARTID_BASE configuration.
The changes include:
1. **Kconfig Updates:**
- Rewrote the help text for ARCH_RV_HARTID_BASE
- Added detailed explanations covering:
* Purpose (mapping global hartid to cluster-local id)
* Examples (hartid ranges for different clusters)
* Key points (SMP_NCPUS, consecutive id requirements)
* Special cases (K230 chip, etc.)
2. **Header File Changes:**
- Modified up_cpu_index() condition from CONFIG_RISCV_PERCPU_SCRATCH to
CONFIG_ARCH_RV_HARTID_BASE != 0 in irq.h
3. **Build System Updates:**
- Changed compilation condition for riscv_cpuindex.c from
CONFIG_ARCH_HAVE_MULTICPU to CONFIG_ARCH_RV_HARTID_BASE != 0 in both
CMakeLists.txt and Make.defs
4. **Source Code Refactoring:**
- Removed CONFIG_RISCV_PERCPU_SCRATCH conditional compilation in
riscv_cpuindex.c
- Added CONFIG_ARCH_RV_HARTID_BASE != 0 conditional compilation in
riscv_internal.h
- Defined simple hartid/cpuid conversion macros when
CONFIG_ARCH_RV_HARTID_BASE is 0
These changes aim to make the CPU index handling more consistent and clear,
using ARCH_RV_HARTID_BASE as the primary configuration for managing hartid
mappings in multi-clust
systems.
## Impact
RISCV SMP
## Testing
GitHub CI and QEMU
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