Made a better filetable, and added commands

Note: if you write the starting part of the command, it will still run

.gitignore

@@ -1 +1 @@
-./build/**
+build

src/calc.asm

@@ -3,8 +3,19 @@
 start:
     mov si, msg
     call print
-    cli
-    hlt
+
+    xor ax, ax
+    int 0x16
+
+.return:
+    mov ax, 0x2000
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    mov ss, ax
+
+    jmp 0x2000:0x0000
 
 %include "./src/print.asm"
 

src/filetable.asm

@@ -1,8 +1,20 @@
+; ------------------
 ;  Simple Filetable
-db "{"  ; Start
-db "kernel.bin:03,"
-db "calc:05,"
-db "coolThing:06"
-db "}"  ; End
+; ------------------
+;
+; 16 Byte entries
+; 0-9   - Filename
+; 10-12 - File extension (type)
+; 13    - Number of filetable entries
+; 14    - Starting Sector
+; 15    - Filesize in sectors (n * 512)
+;
+; ------------------
+
+filetable:
+    db 'boot',0,0,0,0,0,0,'bin',0,1,1   ; boot.bin      - start: 1, size: 1
+    db 'filetable',0,'txt',0,2,1        ; filetable.txt - start: 2, size: 1
+    db 'kernel',0,0,0,0,'bin',0,3,2     ; kernel.bin    - start: 3, size: 2
+    db 'calc',0,0,0,0,0,0,'bin',0,5,1   ; calc.bin      - start: 5, size: 1
 
 times 512-($-$$) db 0

src/kernel.asm

@@ -4,6 +4,11 @@ start:
     ; Save the drive number from stack
     mov byte [driveNumber], dl
 
+
+    mov bx, 0x8000
+    mov es, bx
+    xor bx, bx
+
     call resetTextMode
 
     ; Print start message
@@ -14,7 +19,10 @@ start:
 input:
     mov si, prompt
     call print
-    mov di, userInput
+    mov ax, 0x2000
+    mov ds, ax
+    mov es, ax
+    mov si, userInput
     xor cx, cx
 .loop:
     xor ax, ax      ; Clear ax
@@ -26,25 +34,50 @@ input:
     cmp al, 0x0d    ; Compare with CR
     je .enter
 
-    mov [di], al    ; Add the input to userInput
-    inc cl
-    inc di
+    mov [si], al    ; Add the input to userInput
+    inc cx
+    inc si
     jmp .loop
 .enter:
     mov al, 0x0a    ; Print LF
     int 0x10
-    mov byte [di], 0 ; NULL terminate userInput (Replaces CR)
+    mov byte [si], 0 ; NULL terminate userInput (Replaces CR)
     mov byte [inputLen], cl
 
-    mov al, [userInput]
-    cmp al, 'H'
-    je help
-    cmp al, 'F'
-    je fileBrowser
-    cmp al, 'G'
+    cmp byte [inputLen], 0 ; Check if user input something
+    je input
+
+; Runs a command in userInput
+runCommand:
+    mov di, lsCmd
+    call .cmp
+    je fileList
+
+    mov di, gfxCmd
+    call .cmp
     je graphicsTest
-    cmp al, 'R'
+
+    mov di, helpCmd
+    call .cmp
+    je help
+
+    mov di, rebootCmd
+    call .cmp
     je reboot
+
+    mov di, clearCmd
+    call .cmp
+    je clearScreen
+
+    jmp .end
+.cmp:
+    push cx
+    mov si, userInput
+    repe cmpsb
+    pop cx
+    ret
+.end:
+
 ;
 ; Load Program - Takes userInput and tries to run that file
 ;
@@ -55,13 +88,13 @@ loadProgram:
     xor bx, bx      ; Get [es:bx] to be start of filetable
 .nextCh:
     mov al, [es:bx]
-    cmp al, '}'     ; Check for end of filetable
+    cmp al, 0       ; Check for end of filetable
     je .notFound
 
     cmp al, [di]    ; Check for starting character
     je .beginSearch
 
-    inc bx
+    add bx, 16      ; Move to the next entry
     jmp .nextCh
 .beginSearch:
     push bx         ; Save position, if it doesn't equal
@@ -78,7 +111,7 @@ loadProgram:
     jmp .searchLoop
 .match:
     mov al, [es:bx]
-    cmp al, ':'     ; Check if we are at the end of a filename
+    cmp al, 0       ; Check if we are at the end of a filename
     je executeProgram
 .restartSearch:
     mov di, userInput
@@ -90,30 +123,19 @@ loadProgram:
     call print
     jmp input
     
-; Expects [es:bx] to point to a sector number folowed by a comma ('XX,' where X is 0-9)
 executeProgram:
-    mov cl, 10      ; Get 10 to multiply with
-    xor al, al      ; Reset al
-    inc bx          ; Skip ':'
-.getSectorNum:
-    mov dl, [es:bx]
+    mov al, [es:bx]
+    cmp al, 0       ; Loop until we find the extension
+    jne .getMetadata    
     inc bx
-    cmp dl, ','     ; Check if its end of sector number
-    je .load
-    cmp dl, '0'     ; Check if it is a digit 0-9
-    jl .notFound
-    cmp dl, '9'
-    jg .notFound
-    sub dl, '0'     ; Convert ASCII char to an integer
-    mul cl          ; ax *= cl (al *= 10)
-    add al, dl      ; al += dl
-    jmp .getSectorNum
-.notFound:
-    mov si, sectorNotFoundMsg
-    call print
-    jmp input
-.load:
-    mov cl, al      ; Sector
+    jmp executeProgram
+.getMetadata:
+    add bx, 3       ; Skip the file extension
+    inc bx          ; Ignore Number of FT entries for now
+
+    mov cl, [es:bx] ; Starting sector
+    inc bx
+    mov al, [es:bx] ; Number of sectors to read
 
     mov ah, 0       ; Reset disk system
     mov dl, byte [driveNumber]
@@ -125,7 +147,6 @@ executeProgram:
 
     mov ah, 2       ; Read sectors into memory
     mov dl, byte [driveNumber]
-    mov al, 1       ; Read 1 sector
     mov ch, 0       ; Cylinder
     mov dh, 0       ; Head
     int 0x13
@@ -154,10 +175,17 @@ help:
     jmp input
 
 ;
-; File Browser
+; Clears the screen
 ;
-fileBrowser:
-    mov si, browserMsg
+clearScreen:
+    call resetTextMode
+    jmp input
+
+;
+; File list (ls)
+;
+fileList:
+    mov si, fileListMsg
     call print
 
 ; Prints the filetable
@@ -165,34 +193,99 @@ printFiletable:
     mov bx, FILETAB_LOC
     mov es, bx
     xor bx, bx
-    xor cx, cx
-.filetableLoop:
+    xor cx, cx      ; Entry byte couter
+    mov ah, 0x0e    ; Prepare for printing
+.filenameLoop:
+    mov al, [es:bx] ; Get filename character
+    cmp al, 0       ; Check if it's NULL
+    je .filenameEnd ; If so, end the filename reading
+    cmp cx, 9       ; Check if we already read 10 Bytes
+    je .filenameEnd 
+    int 0x10        ; Else print the character
+    inc cx          ; Increment byte counter
     inc bx
-    mov al, [es:bx] ; Get the filetable character
-    cmp al, '}'     ; Check for filetable end
+    jmp .filenameLoop
+.filenameEnd:
+    push cx
+.skipNull:
+    cmp cx, 0
     je .done
-    cmp al, ':'     ; Check for sector number
-    je .sectorLoop
-    cmp al, ','     ; Check for another entry
-    je .entryLoop
+    cmp cx, 10      ; Check if we're at the end of filename
+    je .fileExt     ; If so, print extension
     inc cx
+    inc bx
+    jmp .skipNull
+.fileExt:
+    ; push cx         ; Save the counter
+    mov al, '.'     ; Print a "." to separate filename from extension
     int 0x10
-    jmp .filetableLoop
-.sectorLoop:
-    cmp cx, 20
-    je .filetableLoop
+.fileExtLoop:
+    mov al, [es:bx]
+    cmp cx, 13      ; Check if we printed 3 characters
+    je .fileExtEnd
+    cmp al, 0
+    je .fileExtEnd
+    int 0x10
+    inc cx
+    inc bx
+    jmp .fileExtLoop
+.fileExtEnd:
+    cmp cx, 13
+    je .whitespace
+    inc cx
+    inc bx
+    mov al, ' '     ; Print whitespace
+    int 0x10
+    jmp .fileExtEnd
+.whitespace:
+    pop cx
+.wsLoop:
+    cmp cx, 11      ; Max filename length + 1 for spacing
+    je .fileInfo
     mov al, ' '
     int 0x10
     inc cx
-    jmp .sectorLoop
-.entryLoop:
+    jmp .wsLoop
+.fileInfo:
+    ; Entry number
+    mov dl, [es:bx]
+    call printHexByte
+    inc bx
+    mov al, ' '
+    int 0x10
+    ; Start sector
+    mov dl, [es:bx]
+    call printHexByte
+    inc bx
+    mov al, ' '
+    int 0x10
+    ; File size
+    mov al, [es:bx]
+    inc bx
+    cmp al, 1
+    je .oneSector       ; Only print 512B
+    shr al, 1           ; Divide by 2
+    jc .oneHalf         ; We had an odd number of sectors
+    add al, '0'
+    int 0x10
+    mov si, kilobyteText
+    call print
+    jmp .repeat
+.oneHalf:
+    add al, '0'
+    int 0x10
+    mov si, oneHalfText
+    call print
+    jmp .repeat
+.oneSector:
+    mov si, sectorLenText
+    call print
+.repeat:
+    mov si, newline
+    call print
     xor cx, cx
-    mov si, newline
-    call print
-    jmp .filetableLoop
+    jmp .filenameLoop
 .done:
-    mov si, newline
-    call print
     jmp input
 
 ;
@@ -249,17 +342,28 @@ driveNumber: db 0
 startMsg: db "kern.", ENDL, ENDL, 0 ; The bootup message
 prompt: db "> ", 0 ; Prompt for input
 fileNotFoundMsg: db "File not found!", ENDL, 0 ; User tries to load nonexistent file
-sectorNotFoundMsg: db "Sector not found!", ENDL, 0 ; File in an incorrect sector in filetable
 programLoadFailMsg: db "Failed while loading program!", ENDL, 0 ; File load fail
+sectorLenText: db "512B", 0
+kilobyteText: db "kB", 0
+oneHalfText: db ".5kB", 0
 
-browserMsg: db " Filename         Sector ", ENDL, \
-               "----------       --------", ENDL, 0
+fileListMsg: db " Filename      E# St Size ", ENDL, \
+                "----------    ------------", ENDL, 0
 
 helpMsg: db "Available Commands:", ENDL, \
-            "F - List all files", ENDL, \
-            "G - Graphics mode test", ENDL, \
-            "H - Help", ENDL, \
-            "R - Reboot", ENDL, 0
+            "clear - Clears the screen", ENDL, \
+            "gfx - Graphics mode test", ENDL, \
+            "help - Prints this message", ENDL, \
+            "ls - List all files", ENDL, \
+            "reboot - Reboots the system", ENDL, 0
+
+; Commands
+; TODO: Put these into a file or something
+lsCmd: db "ls", 0
+helpCmd: db "help", 0
+gfxCmd: db "gfx", 0
+rebootCmd: db "reboot", 0
+clearCmd: db "clear", 0
 
 inputLen: db 0
 userInput: db 0

src/print.asm

@@ -46,8 +46,44 @@ printHex:
     popa
     ret
 
+;
+; Prints a hex byte
+; dl - Hex byte
+;
+printHexByte:
+    pusha
+    xor cx, cx
+.loop:
+    mov al, dl
+    and al, 0xF0
+    ror al, 4
+    add al, '0'
+    cmp al, '9'
+    jle .hexNum
+    add al, 7
+.hexNum:
+    mov ah, 0x0e
+    int 0x10
+    inc cx
+    cmp cx, 2
+    je .done
+    ror dl, 4
+    jmp .loop
+.done:
+    popa
+    ret
+
 hexString: db "0x0000", 0
 
+;
+; Clears the screen
+;
+clear:
+    pusha
+    ; TODO: Make this function
+    popa
+    ret
+
 ; Usefull definitions
 %define ENDL 0x0a, 0x0d
 newline: db ENDL, 0 ; CRLF