Aaron's engineering blog

Are you tired of staring at hex dumps, white papers and manual pages? Want to feel like you truly know how a data type like a file format, or a disk partition LOOKS like. Well I can't help you with the manual pages and white papers, ( https://staff.washington.edu/dittrich/misc/fatgen103.pdf , http://www.eit.lth.se/fileadmin/eit/courses/eitn50/Projekt1/FAT12Description.pdf ) but here is a great example of implementing a fat12 floppy image in assembly. ;//////////////////////////////////////////////////////////////////////////////// ;// THE SCOTCH-WARE LICENSE (Revision 0): ;// <aaronryool@gmail.com> wrote this file. As long as you retain this notice you ;// can do whatever you want with this stuff. If we meet some day, and you think ;// this stuff is worth it, you can buy me a shot of scotch in return ;//////////////////////////////////////////////////////////////////////////////// ; This assembles to a floppy disk image [bits 16] [org 0x7C00] ;;;;;;;;;;;;;;;;;

//////////////////////////////////////////////////////////////////////////////// // THE SCOTCH-WARE LICENSE (Revision 0): // <aaronryool/gmail.com> wrote this file. As long as you retain this notice you // can do whatever you want with this stuff. If we meet some day, and you think // this stuff is worth it, you can buy me a shot of scotch in return //////////////////////////////////////////////////////////////////////////////// # include < stdlib.h > # include < stdio.h > # include < multiboot.h > /***************************************** Flat memory manager from scratch :D *****************************************/ uint32_t MEM_POOL = 0 ; uint32_t MEM_POOL_END = 0 ; uint32_t MEM_POOL_SIZE = 0 ; typedef struct mem_entry { bool free ; uint32_t prev ; uint32_t ptr ; uint32_t next ; } mem_entry_t ; void mem_initialize ( multiboot_uint32_t magic , multiboot_info_t * mbi ) { multiboot_memory_map_t * mmap ; MEM_POOL_