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

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; Aurora OS Bootloader with Kernel-like Features

org 0x7C00
bits 16

start:
    ; Set video mode to 80x25 text
    mov ax, 3
    int 0x10

    ; Clear screen with Aurora colors
    mov ax, 0x0600
    mov bh, 0x1F    ; Blue background, white foreground
    mov cx, 0x0000
    mov dx, 0x184F
    int 0x10

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

    ; Print Aurora shell interface
    mov si, banner
    call print_string
    mov si, prompt
    call print_string

shell_loop:
    ; Wait for key press
    mov ah, 0
    int 0x16

    ; Echo character
    mov ah, 0x0E
    int 0x10

    ; Handle commands
    cmp al, 0x0D  ; Enter
    je .newline
    cmp al, 'q'
    je reboot
    cmp al, 'v'
    je version
    cmp al, 'h'
    je help

    ; Continue loop
    jmp shell_loop

.newline:
    mov si, crlf
    call print_string
    mov si, prompt
    call print_string
    jmp shell_loop

reboot:
    mov si, reboot_msg
    call print_string
    int 0x19

version:
    mov si, version_msg
    call print_string
    mov si, prompt
    call print_string
    jmp shell_loop

help:
    mov si, help_msg
    call print_string
    mov si, prompt
    call print_string
    jmp shell_loop

print_string:
    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 Shell v0.2.0", 0x0D, 0x0A
    db "Commands: h=help, v=version, q=quit", 0x0D, 0x0A, 0

prompt:
    db "aurora> ", 0

crlf:
    db 0x0D, 0x0A, 0

help_msg:
    db 0x0D, 0x0A, "Available commands:", 0x0D, 0x0A
    db "  h - This help", 0x0D, 0x0A
    db "  v - Show version", 0x0D, 0x0A
    db "  q - Reboot", 0x0D, 0x0A, 0

version_msg:
    db 0x0D, 0x0A, "Aurora OS v0.2.0", 0x0D, 0x0A
    db "Prototype Operating System", 0x0D, 0x0A
    db "Built with NASM + Rust", 0x0D, 0x0A, 0

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

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