https://github.com/kariaro/haruos

https://github.com/kariaro/haruos

Last synced: 24 days ago
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• Host: GitHub
• URL: https://github.com/kariaro/haruos
• Owner: Kariaro
• Created: 2024-07-04T15:37:20.000Z (4 months ago)
• Default Branch: main
• Last Pushed: 2024-07-25T11:23:39.000Z (3 months ago)
• Last Synced: 2024-07-25T12:51:07.585Z (3 months ago)
• Language: Assembly
• Size: 94.7 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# HaruOS

This is a two stage bootloader

## Setup

Install nasm and elf tools on windows

```

https://www.nasm.us/pub/nasm/releasebuilds/2.16.03/

```

```

https://github.com/lordmilko/i686-elf-tools/releases/tag/13.2.0

```

## Building

```sh

./scripts/build.sh

```

This will generate a FAT32 image with the first and second stage bootloaders

## Booting

Steps of STAGE1

1. Set CS to `0x0000:0x7C00`

1. Set stack to `0x0000:0xFFFF`

1. Read `STAGE2.BIN` to `0x0000:0x0600`

```

pmode read kernel to  -> 0x8000_0000 (2gb) 

long mode page mem    -> 0x8000_0000 (2gb)

write elf kernel to   -> 0xffff_ffff_8000_0000 (2gb) kernel 

jump to kernel        -> 0xffff_ffff_8000_0000

```

Steps of STAGE2

1. Enter protected mode

1. Read sectors of KERNEL.BIN

1. ??????

1. Enter long mode

1. ??????

1. Jump to `kernel_main` from long mode