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boot

This is a homebrew x86 bootloader.

boot.S

  • Inital stage 1 boot loader installed as the disk's MBR
  • responsible to load the kernal into memory
  • There is no file system so it just loads disk sectors

bootstrap.S

  • stage 2 of the boot sequence
  • initialization code to config and startup the C-level kernal code
  • turns on A20 address via the Keyboard PIC
  • switchs to Protected Mode -has the GDT table included as data table
  • remaps the PIC IRQ's so the do not conflict with CPU exceptions
  • calls C-level kernel "main"
  • contains the ISR handlers for software execptions and hardware interrupts -these service routines set up the stack and call C-level handlers

kernel.c

  • do nothing kernal, prints message to screen and loops forever
  • uses VGA console routines from vgaconsole.c
  • contains the ISR handlers for both software exceptions and hardware interrupts

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learning exercise.....PC bootstrap from scratch

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