1 / 15

Ch 3. Kernel-Mode I/O Processing

Ch 3. Kernel-Mode I/O Processing. Contents. 커널모드의 코드 수행 인터럽트 Priority Deferred Procedure Calls(DPCs) Access to User Buffers Structure of a Kernel-Mode Driver I/O Processing Sequence Summary. How Kernel-Mode Code Executes. CPU Context Trap or Exception Context

makan
Télécharger la présentation

Ch 3. Kernel-Mode I/O Processing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch 3. Kernel-Mode I/O Processing

  2. Contents • 커널모드의 코드 수행 • 인터럽트 Priority • Deferred Procedure Calls(DPCs) • Access to User Buffers • Structure of a Kernel-Mode Driver • I/O Processing Sequence • Summary Ch 3. Kernel-Mode I/O Processing

  3. How Kernel-Mode Code Executes • CPU Context • Trap or Exception Context • User mode -> Kernel Mode (System Call) • Direct I/O요청 시 I/O Manager의 Dispatch routine • Interrupt Context • Interrupt 발생시 • Kernel-Mode Thread Context • Device polling or Time out Ch 3. Kernel-Mode I/O Processing

  4. Use of Interrupt Priorities by Windows 2000 • CPU Priority level • Interrupt Request Level (IRQL) • Priority를 정의하는 숫자 • Interrupt Processing Sequence • 현재 명령의 수행 중지 • 상태정보 저장 • 현재 CPU의 IRQL을 요청된 IRQL값과 같게 함 • 적절한 Interrupt service routine 수행 • Software-generated Interrupt Ch 3. Kernel-Mode I/O Processing

  5. System DPC Queue DIRQL Schedules DPC Object DPC 1 Interrupt Service Routine DPC 2 … DPC Software Interrupt DPC 3 DPC객체를 꺼내옴 DPC Routine 1 DPC Dispatcher DPC Routine n DPC Routine 2 꺼내온 DPC객체의 DPCRoutine을 호출 … Deferred Procedure Calls (DPCs) • DPC의 동작 • 높은 IRQL작업을 지연 수행을 함 Ch 3. Kernel-Mode I/O Processing

  6. Deferred Procedure Calls (DPCs) • DPC의 특성 • 오직 한 개의 DPC객체의 인스턴스가 존재해야 함 • DPC큐에 이미 존재하는 DPC객체를 중복으로 Schedule 불가 • DPC요청에 대한 카운트를 유지 or 개별적인 큐의 구현 • Multiprocessor 상에서 작업의 동기화 • 병렬적인 processor의 interrupt routine Ch 3. Kernel-Mode I/O Processing

  7. Access to User Buffers • Buffer Access Mechanisms • I/O manager에게 User buffer를 RAM에 복사 요청 (Buffered I/O) • RAM의 내용을 Write하거나 I/O를 통한 Read내용을 저장시킴 • Driver가 User buffer를 직접 접근 (Direct I/O) • I/O Manager : User buffer 에 Lock 을 설정함 Ch 3. Kernel-Mode I/O Processing

  8. Structure of a Kernel-Mode Driver • I/O Manager의 Driver routine 호출 시점 • Driver load • Driver Unload or System shutting sown • Device insert or remove • User-Mode에서의 I/O요청 (System Call) • 공유 hardware resource의 사용 가능 시점 • 실제 Device가 동작시 여러 상황 Ch 3. Kernel-Mode I/O Processing

  9. Structure of a Kernel-Mode Driver • Driver Initialization and Cleanup Routine • Driver Entry routine • Driver load시, 자원할당-조정-수락 • Reinitialize routine • 부팅 시 초기화가 불가능한 Driver의 초기화 • Unload routine • Driver의 동적 Unload • Shutdown routine • System 종료 • Bug-check Call-Back routine • System Crash발생시 Ch 3. Kernel-Mode I/O Processing

  10. Structure of a Kernel-Mode Driver • I/O System Service Dispatch Routine • I/O Manager가 I/O요청에 알맞은 Driver와 routine을 찾음 • Open and Close Operation • File • Device Operation • Device Ch 3. Kernel-Mode I/O Processing

  11. Structure of a Kernel-Mode Driver • Data Transfer Routine • Start I/O routine • Device의 데이터 전송 • Interrupt Service Routine (ISR) • Interrupt 생성 • DPC routine • Device 동작의 완료 Ch 3. Kernel-Mode I/O Processing

  12. Structure of a Kernel-Mode Driver • Resource Synchronization Callback • 자원 공유시 동기화 (Kernel-Mode) • Controller Control routine • Controller Register 공유 • Adapter Control routine • DMA Hardware (DMAC) 공유 • Synchronize Critical Section routine • 공유 버퍼 or 자원 Ch 3. Kernel-Mode I/O Processing

  13. Structure of a Kernel-Mode Driver • Other Driver Routine • Timer routine • I/O completion routine • Cancel I/O routine Ch 3. Kernel-Mode I/O Processing

  14. I/O Processing Sequence I/O Request from User-Mode Driver – Start I/O Device Start and Interrupt Service Preprocessing by I/O Manager Win32 Subsystem Driver - ISR Postprocessing by the Driver I/O Manager Driver - DPC Preprocessing by Device Driver IRP Passed Postprocessing by the I/O Manager Driver-Dispatch I/O Manager Ch 3. Kernel-Mode I/O Processing

  15. Summary • Windows 2000 의 SubSystem • Device Driver Architecture • I/O Processing Sequence Ch 3. Kernel-Mode I/O Processing

More Related