1.4 KiB
1.4 KiB
RoBootloader
Low Memory
| start | end | use |
|---|---|---|
| 0x00000 | 0x004ff | BIOS stuff, don't touch |
| 0x00500 | 0x06bff | free space |
| 0x06c00 | 0x07bff | Bootloader stack |
| 0x07c00 | 0x07dff | Bootloader |
| 0x07e00 | 0x07fff | free space |
| 0x08000 | 0x0ffff | ELF file (64 sectors) |
| 0x10000 | 0x7ffff | kernel space |
| 0x80000 | 0x9ffff | EDBA, partially usable |
| 0xa0000 | 0xfffff | unusable |
Bootsector layout
(all addresses are offsets from 0x7C00)
| start | end | use |
|---|---|---|
| 0x0000 | ? | Bootloader code |
| ? | 0x0193 | padding |
| 0x0194 | 0x01bd | SFS header |
| 0x01be | ? | padding |
| ? | 0x01fd | data |
| 0x01fe | 0x01ff | 0x55AA boot magic |
Drive layout
The first 512 bytes are the bootloader, right after that the 32-bit kernel ELF-file, this kernel can be 32KiB big. In the future, this "kernel" can be replaced by a second stage of the bootloader.
Known issues
Stack setup
As I don't quite get how segments work in real mode, there are most likely errors in the way I set up my stack. I'm going on a it works on my machine approach currently.