Disk Functions

setupDisk

Setup values for the bios peramater block

• IN: Nothing
• OUT: Nothing

readSectors

Read the given sectors from the disk

• IN: ES:DI, AX:DX, CX = Location to load the sectors, LBA, Sectors to read
• OUT: CF = Carry flag set on error

writeSectors

Write the given sectors to the disk

• IN: ES:DI, AX:DX, CX = Location of sectors to write, LBA, Sectors to write
• OUT: CF = Carry flag set on error

loadCwd

Allocates and load the current working directory into memory

• IN: Nothing
• OUT: ES:DI, CF = Location of dir in memory, Carry flag set on error

unloadCwd

Unallocate and free the current working directory from memory

• IN: Nothing
• OUT: Nothing

readCwd

Load the current working directory into memory

• IN: ES:DI = Location to load the dir
• OUT: CF = Carry flag set on error

writeCwd

Write the current working firectory to the disk

• IN: ES:DI = Location of the dir to write
• OUT: CF = Carry flag set on error

allocCwd

Allocate the current dir into the memory map

• IN: Nothing
• OUT: ES:DI, CF = Location allocaded for the dir, Carry flag set on error

freeCwd

Free the current working dir from use in the memory map

• IN: ES:DI = Location of dir to free from memory
• OUT: Nothing

loadFat

Allocates and load the FAT table into memory

• IN: Nothing
• OUT: ES:DI, CF = Location of FAT in memory, Carry flag set on error

unloadFat

Unallocate and free the FAT table from memory

• IN: Nothing
• OUT: Nothing

readFat

Read the FAT table into memory

• IN: ES:DI = Location to load the FAT
• OUT: CF = Carry flag set on error

writeFat

Write the FAT table to the disk

• IN: ES:DI = Location of the FAT to write
• OUT: CF = Carry flag set on error

allocFat

Allocate the FAT table into the memory map

• IN: Nothing
• OUT: ES:DI, CF = Location allocaded for the FAT, Carry flag set on error

freeFAT

Free the FAT table from use in the memory map

• IN: ES:DI = Location of FAT to free from memory
• OUT: Nothing

searchDir

Search through a loaded dir for a single file

• IN: ES:DI, DS:SI = Disk buffer with loaded dir, Filename in 8.3 format
• OUT: ES:DI, CF = Pointer to file entry, Carry flag set on error

changeDir

Change the current working directory

• IN: DS:SI = Directory to search for
• OUT: CF = Cary flag set on error

createDir

Create an empty directory

• IN: DS:SI = Directory to create
• OUT: CF = Cary flag set on error

removeDir

Remove an empty directory

• IN: DS:SI = Directory to remove
• OUT: CF = Cary flag set on error

fileSize

Search for a file and return it's size

• IN: DS:SI = Filename to search for
• OUT: AX:DX, CF = Filesize, Carry flag set on error

fileExists

Search for a file to see if it exists

• IN: DS:SI = Filename to search for
• OUT: CF = Cary flag set on error

createFile

Create an empty file

• IN: DS:SI = Filename to create
• OUT: CF = Carry flag set on error

renameFile

Rename a file

• IN: DS:SI, ES:DI = File to rename, New filename
• OUT: CF = Carry flag set on error

deleteFile

Delete a file

• IN: DS:SI = File to delete
• OUT: CF = Carry flag set on error

readFile

Read a file from disk and into memory

• IN: DS:SI, ES:DI = Name of file to read, Location to load the file
• OUT: DX:AX, CF = Filesize, Carry flag set on error

writeFile

Write a file from memory onto the disk

• IN: DS:SI, ES:DI, DX:AX = Name of file to write, Location of file's contents, Filesize
• OUT: CF = Carry flag set on error