Initial Commit

2023-12-21 22:13:56 +01:00
commit a346d66879
14 changed files with 340 additions and 0 deletions
@@ -0,0 +1,185 @@
+[bits 16]
+
+%define ENDL 0x0a, 0x0d
+
+start:
+    call resetTextMode
+
+    ; Print start message
+    mov si, startMsg
+    call print
+
+; Runs prompt
+input:
+    mov si, prompt
+    call print
+    mov di, userInput
+    mov byte [inputLen], 0
+.loop:
+    xor ax, ax      ; Clear ax
+    int 0x16        ; Get a character
+    mov ah, 0x0e    ; Echo back input
+    mov bh, 0
+    int 0x10
+
+    cmp al, 0x0d    ; Compare with CR
+    je .enter
+
+    mov [di], al    ; Add the input to userInput
+    inc di
+    jmp .loop
+.enter:
+    mov al, 0x0a    ; Print LF
+    int 0x10
+    mov byte [di], 0; NULL terminate userInput (Replaces CR)
+
+    mov al, [userInput]
+    cmp al, 'H'
+    je help
+    cmp al, 'F'
+    je fileBrowser
+    cmp al, 'G'
+    je graphicsTest
+    cmp al, 'R'
+    je reboot
+;
+; Load Program - Takes userInput and tries to run that file
+;
+loadProgram:
+    mov ax, userInput
+    ; Get filetable into [es:di]
+    mov bx, FILETAB_LOC
+    mov es, bx
+    xor bx, bx
+    mov di, bx
+
+    repne scasb     ; Scan for string at ax, in string at di
+    je .found
+
+    mov si, notFoundMsg
+    call print
+
+    jmp input
+.found:
+
+    jmp input
+
+;
+; Help - Prints the help message (helpMsg)
+;
+help:
+    mov si, helpMsg
+    call print
+    jmp input
+
+;
+; File Browser
+;
+fileBrowser:
+    mov si, browserMsg
+    call print
+
+; Prints the filetable
+printFiletable:
+    mov bx, FILETAB_LOC
+    mov es, bx
+    xor bx, bx
+    xor cx, cx
+.filetableLoop:
+    inc bx
+    mov al, [es:bx] ; Get the filetable character
+    cmp al, '}'     ; Check for filetable end
+    je .done
+    cmp al, ':'     ; Check for sector number
+    je .sectorLoop
+    cmp al, ','     ; Check for another entry
+    je .entryLoop
+    inc cx
+    int 0x10
+    jmp .filetableLoop
+.sectorLoop:
+    cmp cx, 20
+    je .filetableLoop
+    mov al, ' '
+    int 0x10
+    inc cx
+    jmp .sectorLoop
+.entryLoop:
+    xor cx, cx
+    mov si, newline
+    call print
+    jmp .filetableLoop
+.done:
+    mov si, newline
+    call print
+    jmp input
+
+;
+; Graphics Mode Test
+;
+graphicsTest:
+    call resetGraphicsMode
+
+    ; Test square
+    mov ah, 0x0c        ; Write gfx pixel
+    mov al, 0x02        ; Green
+    mov bh, 0           ; Page number
+
+    mov cx, 100         ; Column number
+    mov dx, 100         ; Row number
+    int 0x10
+.colLoop:
+    inc cx
+    int 0x10
+    cmp cx, 150
+    jne .colLoop
+
+    inc dx
+    int 0x10
+    mov cx, 99
+    cmp dx, 150
+    jne .colLoop
+.done:
+    mov si, startMsg
+    call print
+
+    xor ax, ax
+    int 0x16
+
+    call resetTextMode
+    jmp input
+
+;
+; Reboots the OS
+;
+reboot: jmp 0xffff:0x0000
+
+; ----------
+;  Includes
+; ----------
+%include "./src/print.asm"
+%include "./src/screen.asm"
+
+; --------
+;   Data
+; --------
+startMsg: db "kern.", ENDL, ENDL, 0 ; The bootup message
+prompt: db "> ", 0 ; Prompt for input
+newline: db ENDL, 0 ; CRLF
+notFoundMsg: db "File not found!", ENDL, 0
+
+browserMsg: db " Filename         Sector ", 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
+
+userInput: db 0
+inputLen: db 0
+
+FILETAB_LOC equ 0x1000
+
+times 2*512-($-$$) db 0