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- Define syscall interrupt vector 0x80 - Add 10 system call numbers - Declare syscall handler type - Setup interface for dispatcher
- Add int 0x80 handler entry point - Save/restore all registers and segments - Extract syscall args from registers - Call C dispatcher and return result - Include kernel-mode syscall stub
- Create syscall table with 10 handlers - Implement sys_exit, sys_write, sys_getpid - Add stub implementations for remaining calls - Register syscall handler in IDT - Support user-mode syscall invocation
- Inline assembly wrappers for int 0x80 - Support 0-3 argument syscalls - Provide convenient macros for all syscalls - Enable easy syscall invocation from C
- Test getpid, write, open, close, gettime - Validate syscall return values - Test invalid syscall handling - Demonstrate syscall functionality
- Complete syscall API reference - Document calling convention and ABI - Explain implementation details - Provide usage examples - List future enhancements
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