1 Pertemuan 18 Input / Output (lanjutan) Matakuliah: T0316/sistem Operasi Tahun: 2005 Versi/Revisi:...
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Transcript of 1 Pertemuan 18 Input / Output (lanjutan) Matakuliah: T0316/sistem Operasi Tahun: 2005 Versi/Revisi:...
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Pertemuan 18Input / Output (lanjutan)
Matakuliah : T0316/sistem Operasi
Tahun : 2005
Versi/Revisi : 5
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Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :• mendemonstrasikan tingkatan (layer) input-
output (C3)
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Outline Materi
• I/O Software Layer• Interrupt Handler• Device Driver• Device Independent I/O Software• User space I/O software• Clock (Timer)
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Interrupt Handlers (1)
• Interrupt handlers are best hidden– have driver starting an I/O operation
block until interrupt notifies of completion
• Interrupt procedure does its task– then unblocks driver that started it
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Interrupt Handlers (2)
Steps must be performed in software after interrupt completed
1. Save regs not already saved by interrupt hardware
2. Set up context for interrupt service procedure3. Set up stack for interrupt service procedure4. Ack interrupt controller, reenable interrupts5. Copy registers from where saved6. Run service procedure 7. Set up MMU context for process to run next8. Load new process' registers9. Start running the new process
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Device Drivers
• Logical position of device drivers is shown here• Communications between drivers and device controllers goes
over the bus
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Device-Independent I/O Software (1)
Functions of the device-independent I/O software
Uniform interfacing for device drivers
Buffering
Error reporting
Allocating and releasing dedicated devices
Providing a deice-independent block size
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Device-Independent I/O Software (2)
(a) Without a standard driver interface
(b) With a standard driver interface
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Device-Independent I/O Software (3)
(a) Unbuffered input(b) Buffering in user space(c) Buffering in the kernel followed by copying to user space(d) Double buffering in the kernel
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Clock Software
• Memelihara waktu harian
• Mencegah suatu proses berjalan melebihi kuantum waktu CPU
• Menghitung pemakaian waktu CPU
• Menangani alarm system call yang dibuat user
• Watchdog timer untuk system
• Profiling, monitoring, statistic