; BOS kernel Christoffer Bubach, 2012-2015. ;
;----------------------------------------------------------;
; ;
-; VFS handling all devices and filesystems. ;
+; VFS handling all devices and filesystems. ;
; ;
;----------------------------------------------------------;
+
+ ; file handles need to be dword, where the high
+ ; word contains drive number, and the low word
+ ; is the drive/FS specific handle. limits FS to
+ ; a max of 65535 opened files. should be alright. ;)
+
+
+ ;---------------------------------------------;
+ ; VFS main structure ;
+ ;---------------------------------------------;
+ struc VFS
+ {
+ .number: times 255 db 0 ; 00=FD, 0x10=HD, 0x60=CD, 0x80=VD, 90=RD, B0=ND
+ .storage:
+ times 255 * sizeof.VFS_storage db 0 ; storage driver structure
+ .filesystem:
+ times 255 * sizeof.VFS_filesystem db 0 ; filesystem driver structure
+ .mounted db 0 ; 1/0 switch if mounted
+ .current_path: times 255 db 0 ; drive opened path (increase max path size?)
+ }
+
+ virtual at 0 ; could use "at esi" instead
+ VFS VFS
+ sizeof.VFS = $-$$
+ end virtual
+
+ ;---------------------------------------------;
+ ; VFS storage driver structure ;
+ ;---------------------------------------------;
+ struc VFS_storage
+ {
+ .data_pointer dd 0 ; internal driver data
+ .init dd 0 ; pointer to init
+ .deinit dd 0 ; remove driver
+ .read dd 0 ; read device
+ .write dd 0 ; write device
+ .ioctl dd 0 ; handle device specific extras
+ }
+
+ virtual at 0
+ VFS_storage VFS_storage
+ sizeof.VFS_storage = $-$$
+ end virtual
+
+ ;---------------------------------------------;
+ ; VFS filesystem structure ;
+ ;---------------------------------------------;
+ struc VFS_filesystem
+ {
+ .data_pointer dd 0 ; internal driver data
+ .init dd 0 ; pointer to init
+ .deinit dd 0 ; remove driver
+ .format dd 0 ; format drive
+ .mount dd 0 ; mount drive
+ .unmount dd 0 ; unmount drive
+ .find dd 0 ; find file
+ .findnext dd 0 ; get next match
+ .open dd 0 ; open file, get handle
+ .read dd 0 ; read file from handle
+ .write dd 0 ; write file from handle
+ .seek dd 0 ; seek from handle
+ .remove dd 0 ; remove file/dir
+ .create dd 0 ; create file/dir
+ .ioctl dd 0 ; extra calls if exists
+ }
+
+ virtual at 0
+ VFS_filesystem VFS_filesystem
+ sizeof.VFS_filesystem = $-$$
+ end virtual
+
+ ;---------------------------------------------;
+ ; VFS structure pointer ;
+ ;---------------------------------------------;
+ VFS_structure dd 0
+
+
+;--------------------------------------------------------------;
+; init_vfs - detect connected drives ;
+;--------------------------------------------------------------;
+; ;
+; out: cf = set if failed ;
+; ;
+;--------------------------------------------------------------;
init_vfs:
push eax
- ; a bit more code here
+ push ebx
+
+ mov ebx, sizeof.VFS ; allocate structure size
+ call allocate_mem
+ cmp eax, 0
+ jne .ok
+ stc ; if error, set carry
+ mov ebx, 0
+
+ .ok:
+ mov dword [VFS_structure], ebx
+
+ pop ebx
+ pop eax
+ ret
+
+;--------------------------------------------------------------;
+; add_media - add media driver ;
+;--------------------------------------------------------------;
+; ;
+; in: reg = pointer to VFS drive info ;
+; ;
+; out: reg = pointer to struct(s) if FAT12 found ;
+; ;
+;--------------------------------------------------------------;
+add_media:
+ push eax
+ ;...
+ pop eax
+ ret
+
+;--------------------------------------------------------------;
+; add_fs - add filesystem driver ;
+;--------------------------------------------------------------;
+; ;
+; in: reg = pointer to VFS drive info ;
+; ;
+; out: reg = pointer to struct(s) if FAT12 found ;
+; ;
+;--------------------------------------------------------------;
+add_fs:
+ push eax
+ ;...
pop eax
ret
\ No newline at end of file
projects / BOS.git / blobdiff