ThePassionate opened a new pull request, #17974:
URL: https://github.com/apache/nuttx/pull/17974
# Arch/TriCore: Support Cache Function
## Summary
This PR adds comprehensive cache operation support for TriCore architecture.
It enables instruction cache (I-Cache) and data cache (D-Cache) functionality
with proper configuration, initialization, and management interfaces. The
implementation includes performance events integration for cache operations.
## Changes
### Files Modified
1. **arch/tricore/Kconfig**
- Add cache configuration options
- Enable I-Cache support configuration
- Enable D-Cache support configuration
2. **arch/tricore/src/common/CMakeLists.txt**
- Add tricore_cache.c to build system
- Include cache implementation in compilation
3. **arch/tricore/src/common/Make.defs**
- Update compiler flags for cache operations
- Add cache-related build definitions
4. **arch/tricore/src/common/tricore_initialize.c**
- Initialize cache subsystem in architecture initialization
- Call I-Cache and D-Cache enable functions during system startup
- Integrate performance events initialization
5. **arch/tricore/src/common/tricore_cache.c** (NEW)
- Implement instruction cache (I-Cache) operations
- Implement data cache (D-Cache) operations
- Provide cache enable/disable functions
- Cache size and configuration management (523 lines)
## Technical Details
**Cache Architecture Support:**
- Instruction Cache (I-Cache) enable/disable functionality
- Data Cache (D-Cache) enable/disable functionality
- Cache configuration and initialization routines
- Cache performance monitoring integration
**Performance Enhancement:**
- Improves instruction fetch performance through I-Cache
- Reduces memory latency through D-Cache
- Enables performance event tracking for cache operations
- Configurable cache behavior through Kconfig
**Initialization Flow:**
- Automatic cache initialization during system startup
- Optional cache enable/disable based on configuration
- Performance events setup for cache monitoring
## Impact
- **Performance**: Enables caching for improved instruction fetch and data
access performance
- **Architecture**: Adds cache management capabilities to TriCore
architecture
- **System Boot**: Proper cache initialization during system startup
- **Configurability**: Cache behavior can be configured via Kconfig options
- **Monitoring**: Supports performance event tracking for cache operations
## Testing
**Test Environment:**
- TriCore architecture platform with cache support
- NuttX standard build system
**Test Procedure:**
1. Build NuttX with ARCH_ICACHE and/or ARCH_DCACHE enabled
2. Verify cache initialization during system startup
3. Validate cache enable/disable operations
4. Test performance with cache enabled vs. disabled
5. Verify performance events integration
6. Check cache configuration options
**Test Results:**
- ✅ I-Cache initialization successful
- ✅ D-Cache initialization successful
- ✅ Cache enable/disable functions working correctly
- ✅ Performance events properly integrated
- ✅ No regressions in core functionality
- ✅ Backward compatible with cache disabled configuration
- ✅ Performance improvements measured
## Configuration Options
**New Kconfig Options:**
- `CONFIG_ARCH_ICACHE`: Enable instruction cache support
- `CONFIG_ARCH_DCACHE`: Enable data cache support
- `CONFIG_ARCH_PERF_EVENTS`: Enable performance event tracking
## Related Issues
- TriCore cache functionality support
- Performance optimization for TriCore architecture
- Cache initialization and management
- Architecture-specific cache operations
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