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update readme with more information

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Elaina Claus
2023-08-22 16:22:13 -04:00
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README.md
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@@ -31,18 +31,18 @@ This project is licensed under the MIT License. See the [LICENSE.md](^2^) file f
### mbr/mbr.s
This file contains the code for a Master Boot Record (MBR) that loads the boot loader from a floppy disk image. It is written in Assembly and uses BIOS interrupts to read sectors from disk.[^note]
This file contains the code for a Master Boot Record (MBR) that attempts to find an active partition to load. The CPU is assumed to be in 16-bit real mode at this point and the bios has loaded the 1st sector of the disk (512 bytes) to 0x0000:0x7C00. First the mbr code relocates from 0x7C00 to 0x0600 and then jumps to the entry point. the loader attempts to load the first active partition it can find and loads the vbr to 0x7c00 (512 bytes) and then jumps to 0x0000:0x7C00. It is written in Assembly and uses BIOS interrupts to read sectors from disk.[^note]
### vbr/vbr.s
This file contains the code for a Volume Boot Record (VBR) that loads the boot loader from a FAT partition on disk. It is written in Assembly and uses BIOS interrupts to read sectors from disk.[^note]
This file contains the code for a Volume Boot Record (VBR) that loads the stage2 loader code from the booted disk. It reads disk sectors 1-63 into memory to STAGE2_ENTRY(defaults to 0x7E00 in config.inc) this currently allows for stevia to load up to 32KiB of code to perform bootloader duties. It is written in Assembly and uses BIOS interrupts to read sectors from disk.[^note]
### stage2/stage2.s
This file contains the code for a second-stage boot loader that loads additional modules from disk. It is written in Assembly and uses BIOS interrupts to read sectors from disk.[^note]
This file contains the code for a second-stage boot loader that loads additional modules from disk, performs some system sanity checks, and provides a simple boot interface for options/configuration. It is written in Assembly and uses BIOS interrupts to read sectors from disk.[^note]
### miniboot32/BOOT_386.s
This file contains the code for a 32-bit boot loader that loads the kernel from a floppy disk image. It is written in Assembly.[^note]
This file contains the code for a 32-bit binary that can be loaded and ran with stevia as a mini demo. It is written in Assembly.[^note]
[^note]: **Note:** Please note that the assembly code is strictly targeting the Pentium 3 Katmai uArch, but it might run elsewhere. Your mileage may vary.