Linux Journal May 2019 by Linux Journal LLC

Author:Linux Journal LLC
Language: eng
Format: mobi, epub
Tags: Linux
Publisher: Linux Journal LLC
Published: 2019-05-30T05:00:00+00:00

Let's set the output format to be a 32-bit x86 executable. The entry point into this binary is the start function from your assembly file, which eventually loads the main program from the C file. Further down, this essentially is telling the linker how to merge your object code and at what offset. In the linker file, you explicitly specify the address in which to load your kernel binary. In this case, it is at 1M or a 1 megabyte offset. This is where the main kernel code is expected to be, and the bootloader will find it here when it is time to load it.

Booting the Kernel

The most exciting part of the effort is that you can piggyback off the very popular GRand Unified Bootloader (GRUB) to load your kernel. In order to do this, you need to create a grub.cfg file. For the moment, write the following contents into a file of that name, and save it into your current working directory. When the time comes to build your ISO image, you'll install this file into its appropriate directory path.

grub.cfg

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