Completed FAT12 structures, added some for VFS.

diff --git a/doc/shell.txt b/doc/shell.txt
new file mode 100644 (file)
index 0000000..b271b2b
--- /dev/null
+++ b/doc/shell.txt
@@ -0,0 +1,26 @@
+SHELL DESIGN
+============
+
+The BOS shell should operate at a minimum resolution of 80*25, but prefarably on more.
+It should be tile-able to allow different apps to run in different parts of the window, such
+as a "graphical" file browser might use up all but one line at the bottom for commands.
+
+The mouse or keyboard interrupts will be used to switch between active tile, giving that
+areas program full control. Simulating multitasking to some degree.
+
+The built in scripting language needs support to set up screen resolution, tile areas,
+and more on boot.
+
+Programs should provide minimum resolution requirements if not text based scrolling
+is all it needs.
+
+Pop-ups with kernel panics or dialogs could cover any area.
+
+The shell scripting language will allow a few special case script-files called in an
+event like fashion.  If .RUN is the default script exstension, AUTO.RUN would be used
+at boot. EXIT.RUN when exiting/rebooting, NOTFOUND.RUN to parse commands not understood
+and provide shortcuts for builtin commands. Cron like functionality for other
+scripts to be scheduled.
+
+GUI apps using build in functions for borders, pop-ups and such will scale perfectly
+from 80*25 textmode all the way to some VESA mode with polished graphics, like 1024*768.
\ No newline at end of file

diff --git a/kernel/fat12/fat12.asm b/kernel/fat12/fat12.asm
index 416fe43d42b1cbb66d7f0dc78c68ee55235318da..d7ad9cb1fa176f0ed997617dacff98f1e92af6ad 100644 (file)
--- a/kernel/fat12/fat12.asm
+++ b/kernel/fat12/fat12.asm
@@ -11,17 +11,19 @@
     ;---------------------------------------------;
     struc fat12
     {
-        .disk_number                     db  0       ; which VFS disk number
-        .root_dir                        dw  0       ; position of rootdir
-        .fat_1                           dd  0       ; position of fat1
-        .fat_2                           dd  0       ; position of fat2
-        .data_area                       dw  0       ; position of dataarea
-        .disk_size                       dd  0       ; total storage size
-        .free_space                      dd  0       ; free space available
-        .boot                            bootsector  
+        .disk_number                     db  0        ; which VFS disk number
+        .root_dir                        dw  0        ; position of rootdir
+        .fat_1                           dd  0        ; position of fat1
+        .fat_2                           dd  0        ; position of fat2
+        .data_area                       dw  0        ; position of dataarea
+        .disk_size                       dd  0        ; total storage size
+        .free_space                      dd  0        ; free space available
+        .boot: times sizeof.bootsector   db  0        ; copy of FAT12 bootsector
         .dir_entries:
-            times 16 * sizeof.dir_entry  db 0        ; 512b dir entry buffer
-        .fat_buffer:      times 512      db 0        ; 512b FAT cluster info buffer
+            times 16 * sizeof.dir_entry  db  0        ; 512b dir entry buffer
+        .fat_buffer:      times 512      db  0        ; 512b FAT cluster info buffer
+        .filehandles:
+            times 32 * sizeof.filehandle db  0        ; for now, max opened files is 32
     }
 
     virtual at 0                                      ; could use "at esi" instead
@@ -103,6 +105,29 @@
         sizeof.lfn_entry = $-$$
     end virtual
 
+    ;---------------------------------------------;
+    ;   FAT12 file-handle structure               ;
+    ;---------------------------------------------;
+    struc filehandle
+    {
+        .handles           db  0                      ; reference count or or zero for unused
+        .mode              db  0                      ; open mode. 0=read, 1=write, 2=r/w.
+        .lfn_entry         dw  0                      ; file LFN directory entry position
+        .direntry          dw  0                      ; file directory entry position
+        .cluster           dw  0                      ; file first cluster
+        .attribute         db  0                      ; file attributes
+        .filetime          dw  0                      ; last modified time
+        .filedate          dw  0                      ; last modified date
+        .filesize          dd  0                      ; filesize
+        .position          dd  0                      ; R/W position in file
+        .clusterpos        dw  0                      ; cluster number of last cluster read
+    }
+
+    virtual at 0
+        filehandle filehandle
+        sizeof.filehandle = $-$$
+    end virtual
+
     ;------------------------------------------;
     ;   FAT cluster constants used             ;
     ;------------------------------------------;
@@ -145,6 +170,26 @@ fd0 fat12            ; define fd0 data..  tmp example.
 ;drive dd 0
 ;mov edi, drive+fat12into.boot
 
+;--------------------------------------
+; possible interface to copy/follow,
+; add getFilename/path function?
+;--------------------------------------
+;    INT 21,3C  Create file using handle
+;    INT 21,3D  Open file using handle
+;    INT 21,3E  Close file using handle
+;    INT 21,3F  Read file or device using handle
+;    INT 21,40  Write file or device using handle
+;    INT 21,41  Delete file
+;    INT 21,42  Move file pointer using handle
+;    INT 21,43  Change file mode
+;    INT 21,45  Duplicate file handle
+;    INT 21,46  Force duplicate file handle
+;    INT 21,56  Rename file
+;    INT 21,57  Get/set file date and time using handle
+;    INT 21,5A  Create temporary file (3.x+)
+;    INT 21,5B  Create new file (3.x+)
+;    INT 21,67  Set handle count (DOS 3.3+)
+
 ;--------------------------------------------------------------;
 ;   init_fat12  -  detect if drive fs is fat12 and init        ;
 ;--------------------------------------------------------------;

diff --git a/kernel/vfs/vfs.asm b/kernel/vfs/vfs.asm
index 057132764221886491ef65042a551c04d5fd799f..30d5590c39e0f5c6f6593c9d2a8d4674ce44db6f 100644 (file)
--- a/kernel/vfs/vfs.asm
+++ b/kernel/vfs/vfs.asm
@@ -7,6 +7,12 @@
 ;----------------------------------------------------------;
 
 
+    ; 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                        ;
     ;---------------------------------------------;
@@ -17,6 +23,8 @@
             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