Understanding the Role of an OS Kernel by Building One from Scratch
summary
Builds a small UNIX-like microkernel from scratch using QEMU as the emulator. Covers writing a boot sector and tiny console to load the kernel, handling hardware (keyboard) and software interrupts, implementing system calls, and a simple multi-process setup to measure context-switch overhead; shows the assembler/linker code and demonstrates successful boot and execution in the emulator.
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chapters (24)
- 0:00Introduction
- 1:05OS role and utility
- 2:49Modern kernel architectures
- 4:11Monolithic kernel structure
- 5:40Boot sector operation
- 7:45Kernel stack and init
- 9:30Execution modes and virtual memory
- 11:17Memory segment management
- 13:31Leaving assembly in kernel dev
- 14:34Hardware device communication
- 17:46DMA and performance
- 18:48Hardware interrupts and exceptions
- 21:57Kernel interrupt handling
- 24:25Software interrupts and system calls
- 26:10Protection rings and security
- 28:46System calls in assembly
- 30:10Kernel role in user apps
- 31:55Multitasking and scheduling
- 33:04System clock and time management
- 34:50Task context and switching
- 37:23Virtual file system
- 39:28Hybrid kernels and loadable modules
- 41:56Kernel creation tools
- 43:41Dev resources and communities
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