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boot
----
Simple bootloader, loading in two phases and loading the kernel itself
* boot.bin - boot sector (stage 1 and 2, total 2k), offset 0x7c00
* boot.asm - the main boot sector code using:
* kernel.bin - linked kernel with fix start offset 0x8800
* boot_gdt.asm - the early GDT, flat memory model, no protection
* stage1_functions.asm - real mode functions of the bootloader (stage 1 and 2)
* stage2_real_functions.asm - real mode functions for stage 2
* stage2_a20.asm - various methods to enable the A20 address line
* stage2_check_magic.asm - function to make sure the image contains a magic marker
* stage2_switch_mode.asm - early GTD loading and switching from real to protected mode
* stage2_pm_functions.asm - protected mode helper functions for stage 2
* kernel.c - Kernel C entry point 'kernel_main'
* magic.bin (512 bytes magic marker sector)
* magic.asm
kernel
------
Kernel main and utility routines like early consoles.
* kernel.c - kernel helper functions
* console.c - the kernel console, can use VGA or serial port for now
* vga.c - VGA basic output routines for early kernel output
* serial.c - serial output to COM1 (only sequential ASCII chars, no terminal)
hardware
--------
Hardware abstraction layer.
* port.c, port.asm - I/O ports
* interrupts.c, interrups.asm - interrupt handlers
* pci.c - PCI introspection and driver initialization
drivers
-------
Driver framework and specific drivers.
* driver.c - generic driver manager
* keyboard.c - PS/2 keyboard
* mouse.c - PS/2 mouse
* vga.c - standard VGA video driver
libc
----
Stub C library implementation.
C library definitions
* stddef.h - definition of NULL, size_t
* limits.h - domain range constants like INT_MAX
C library routines
* string.c - string, memory functions
* stdlib.c - UNIX standard library functions
* stdio.c - I/O functions, printing
* setjmp - setjmp/longjmp implementation (in assembly)
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