aurora-os/aurora-final.asm at master · QuirkyCodex/aurora-os · GitHub

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; Aurora OS - Functional Bootable System

org 0x7C00
bits 16

start:
    ; Set video mode
    mov ax, 0x0003
    int 0x10

    ; Clear screen
    mov ax, 0x0600
    mov bh, 0x1F
    mov cx, 0x0000
    mov dx, 0x184F
    int 0x10

    ; Position cursor
    mov ah, 0x02
    mov bh, 0
    mov dh, 2
    mov dl, 10
    int 0x10

    ; Aurora Banner
    mov si, banner
    call print_str
    mov dh, 8
    mov dl, 5
    call set_cursor
    mov si, menu
    call print_str
    mov dh, 10
    mov dl, 5
    call set_cursor
    mov si, prompt
    call print_str

loop:
    ; Get input
    mov ah, 0
    int 0x16

    ; Quit on ESC
    cmp al, 0x1B
    je reboot
    cmp al, 'q'
    je reboot
    cmp al, '1'
    je info
    cmp al, '2'
    je shell

    ; Echo
    mov ah, 0x0E
    int 0x10
    jmp loop

info:
    mov dh, 12
    mov dl, 5
    call set_cursor
    mov si, info_msg
    call print_str
    call wait_key
    jmp clear_and_restart

shell:
    mov dh, 12
    mov dl, 5
    call set_cursor
    mov si, shell_msg
    call print_str
    mov si, shell_prompt
    call print_str
    call basic_shell
    jmp clear_and_restart

basic_shell:
    mov ah, 0
    int 0x16
    cmp al, 0x1B
    je .done
    cmp al, 0x0D
    je .newline
    mov ah, 0x0E
    int 0x10
    jmp basic_shell
.newline:
    mov si, crlf
    call print_str
    mov si, shell_prompt
    call print_str
    jmp basic_shell
.done:
    ret

reboot:
    mov si, reboot_msg
    call print_str
    int 0x19

clear_and_restart:
    mov ax, 0x0600
    mov bh, 0x1F
    mov cx, 0x0000
    mov dx, 0x184F
    int 0x10
    mov dh, 2
    mov dl, 10
    call set_cursor
    mov si, banner
    call print_str
    mov dh, 8
    mov dl, 5
    call set_cursor
    mov si, menu
    call print_str
    mov dh, 10
    mov dl, 5
    call set_cursor
    mov si, prompt
    call print_str
    jmp loop

wait_key:
    mov ah, 0
    int 0x16
    ret

set_cursor:
    mov ah, 0x02
    mov bh, 0
    int 0x10
    ret

print_str:
    pusha
.ps_loop:
    lodsb
    cmp al, 0
    je .done
    mov ah, 0x0E
    mov bh, 0
    int 0x10
    jmp .ps_loop
.done:
    popa
    ret

; Messages
banner:
    db "🌠 Aurora OS v0.3.0", 0

menu:
    db "[1] System Info", 0x0D, 0x0A
    db "[2] Shell Mode", 0x0D, 0x0A, 0

prompt:
    db "Choose option: ", 0

info_msg:
    db "Aurora OS: Built from scratch", 0x0D, 0x0A
    db "Status: Running successfully!", 0x0D, 0x0A, 0

shell_msg:
    db "Welcome to Aurora Shell!", 0x0D, 0x0A
    db "Type ESC to exit", 0x0D, 0x0A, 0

shell_prompt:
    db "aurora$", 0

reboot_msg:
    db 0x0D, 0x0A, "Rebooting...", 0

crlf:
    db 0x0D, 0x0A, 0

; Boot signature
times 510 - ($ - $$) db 0
dw 0xAA55