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diff --git a/README.md b/README.md new file mode 100644 index 0000000..87e6b93 --- /dev/null +++ b/README.md @@ -0,0 +1,32 @@ +## Disclaimer +----------------------- +For now, assumes that A20 is already enabled on your device by BIOS. + +## Why Bash? +----------------------- +I like it more, and feels more customizable than makefile. +This project is not going to be permanent anyways, just some bootloader. + +## Disk Mapping +----------------------- +0x0 - 0x200 -> Master Boot Record (MBR) +0x200 - 0x9ff -> Stage 1 +* - * -> Stage 2 + +## Memory Mapping +----------------------- +0x7c00 - 0x7e00 -> BIOS MBR +0x7e00 - 0x9200 -> stage 1 + +## Stages +----------------------- +- early stage 1 (MBR) +The only duty of this stage is to load the stage 1 bootloader. + +- stage 1 +1. Detects available video memory, and RAM memory. +2. Switches to 32-bit execution and protected mode. + +- stage 2 +1. Switches to 64-bit execution (long mode). +2. Implements a FAT driver to load a kernel (or OS) file from disk. |