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Microkernel/Requirements
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==== 4.1.2 Functional Requirements ==== ===== FR-001: Module States and Transitions ===== * The system MUST implement basic state management: ** Core module states: *** LOADED: Module binary loaded but not initialized *** RUNNING: Module actively executing *** TERMINATED: Module execution completed ** Basic state transitions ** Basic consistency checks ** Basic notifications * The system SHOULD support advanced states: ** Additional states: *** INITIALIZING: Startup sequence *** PAUSED: Temporarily suspended *** TERMINATING: Cleanup in progress ** Complex state transitions ** Advanced consistency management ** Detailed state notifications ===== FR-002: Resource Management ===== * The system MUST implement basic resource control: ** Basic memory management: *** Memory region allocation *** Basic isolation ** Basic resource tracking: *** CPU usage *** Memory limits *** Basic file handles *** Basic leak prevention *** Basic quotas * The system SHOULD implement advanced resource management: ** Advanced tracking: *** Detailed CPU scheduling *** Fine-grained memory control *** Complex handle management *** Network resource control ** Advanced leak prevention ** Dynamic quota adjustment ===== FR-003: Security and Isolation ===== * The system MUST enforce memory isolation: ** Separate address spaces per module ** Memory access control lists ** Stack and heap protection * The system MUST implement basic security: ** Resource access control ** Basic capability management ** Revocation support * The system SHOULD implement advanced security: ** Fine-grained capability controls ** End-to-end encryption between modules ** Message authentication ** Anti-tampering protections ===== FR-004: Error Handling and Recovery ===== * The system MUST handle basic errors: ** Module crashes ** Resource exhaustion ** Invalid state transitions ** Basic communication failures * The system MUST provide basic recovery: ** Error isolation between modules ** Module restart capability ** Basic state recovery * The system SHOULD support advanced recovery: ** Graceful degradation ** Complex failure handling ** Comprehensive state recovery ** Detailed audit logging ===== FR-005: Module Communication and Interaction ===== * The system MUST support fundamental communication: ** Basic IPC mechanisms: *** Shared memory regions for data transfer *** Message passing primitives *** Lock-free queues for control messages *** Memory protection between modules ** Core interaction patterns: *** Direct communication channels *** Event notification system *** Publish/subscribe mechanisms *** Request/response patterns ** Essential security: *** Module authentication *** Access control enforcement *** Resource isolation *** Message integrity verification * The system MUST provide service management: ** Service discovery: *** Module capability advertisement *** Service endpoint discovery *** Dynamic service binding *** Version negotiation ** Capability management: *** Resource access capabilities *** Communication permissions *** Service usage rights *** Access tracking * The system SHOULD implement performance features: ** Advanced IPC: *** Zero-copy message passing *** Direct memory access for trusted modules *** NUMA-aware memory allocation *** Memory mapped channels ** Performance optimizations: *** Batching for small messages *** Pipeline parallelism *** Memory pre-allocation *** Cache-line alignment *** Thread affinity control *** Dynamic buffer sizing ** Communication enhancements: *** Fast-path for trusted modules *** Asynchronous messaging with backpressure *** Priority-based routing *** Stream processing pipelines * The system SHOULD support advanced security: ** Enhanced authentication: *** Cryptographic identity verification *** Trust level validation *** Runtime integrity monitoring ** Advanced isolation: *** Capability delegation controls *** Fine-grained access control *** Secure channel establishment *** Optional encryption for sensitive data * The system SHOULD implement network module privileges: ** Raw socket access capabilities ** Direct hardware interface access ** Priority scheduling options ** Enhanced resource quotas * The system SHOULD provide performance guarantees: ** Quality of Service enforcement: *** Bandwidth guarantees *** Latency requirements *** Priority levels *** Resource reservations ** Resource allocation: *** Dynamic thread pool management *** Memory pre-allocation strategies *** I/O scheduling priorities *** CPU affinity control ===== FR-007: System Resource Management ===== * The system MUST provide basic OS resource access: ** Basic network integration: *** Socket virtualization *** Basic namespace isolation *** Protocol registration ** Basic resource access: *** File descriptor management *** System call mediation *** Device access control * The system MUST implement basic virtualization: ** Basic network interfaces: *** Basic traffic isolation *** Protocol filtering ** Basic resource isolation: *** Filesystem sandboxing *** IPC control *** Resource accounting * The system MUST support basic configuration: ** Basic network settings: *** Interface configuration *** Protocol settings ** Basic system settings: *** Access policies *** IPC parameters *** Basic monitoring * The system SHOULD support advanced features: ** Advanced network features: *** Complex traffic isolation *** QoS management *** Advanced routing *** Traffic shaping ** Advanced resource management: *** Fine-grained virtualization *** Advanced monitoring *** Performance tuning ===== FR-008: Module Verification and Security ===== * The system MUST implement basic verification: ** Basic signature checks ** Hash verification ** Version checks * The system MUST provide basic integrity: ** Basic runtime validation ** Memory boundary checks ** Basic trust levels * The system MUST support basic updates: ** Module replacement ** Basic state transfer * The system SHOULD implement advanced security: ** Advanced integrity monitoring: *** Control flow integrity *** Deep runtime validation ** Advanced trust management: *** Dynamic trust adjustment *** Fine-grained access control ** Advanced update features: *** Atomic updates *** Complex state transfer *** Rollback support <span id="other-nonfunctional-requirements"></span>
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