Module fat32_loader 

FAT32 module loader FAT32 module loader for reading userspace ELFs from boot partition.

Self-contained FAT32 parser with no external filesystem dependencies. Reads the BPB, follows cluster chains, parses directory entries (8.3 + LFN), and loads ELF modules into memory.

Safety considerations

All unsafe blocks are confined to ELF memory copy and are documented. The parser uses no global mutable state : all buffers are stack-local.

Structs

BootModules

Bpb 🔒

ClusterChainIter 🔒

Iterates over clusters in a chain, with cycle detection.

DirEntry

FatFs

ModuleInfo

ShortNameDisplay 🔒

Small stack-allocated buffer for displaying a short file name.

Enums

DirEntryName 🔒

Constants

ATTR_ARCHIVE 🔒

ATTR_DIRECTORY 🔒

ATTR_HIDDEN 🔒

ATTR_LFN 🔒

ATTR_READ_ONLY 🔒

ATTR_SYSTEM 🔒

ATTR_VOLUME_ID 🔒

DIR_ENTRY_SIZE 🔒

FAT32_EOC 🔒

MAX_CLUSTER_CHAIN 🔒

Maximum cluster chain length to prevent infinite loops on corrupted FAT.

MAX_PATH_DEPTH 🔒

Maximum number of path components.

MODULE_DIR 🔒

MODULE_NAMES 🔒

SECTOR_SIZE 🔒

Functions

is_valid_elf 🔒

Validate that a buffer looks like a valid ELF header.

load_all_modules

Load all boot modules from the FAT32 boot partition.

load_elf_from_fat 🔒

Load an ELF from a directory entry into allocated memory.

load_module

Load a single module from FAT32.

make_sfn 🔒

Build an 8.3 short name from a string for comparison.