Graphic 3D: 11/20/24

miercuri, 20 noiembrie 2024

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FASM : simple bootloader source code with menu .

This is the source code with a boot menu and can be tested with qemu emulator.

I need to use the Sonet 3.5 artificial inteligence to search infos and make this source code better, but I learn assembly in the past.

The compile commands of the source code:

mythcat@localhost:~/fasm$ ./fasm.x64
flat assembler  version 1.73.32
...
mythcat@localhost:~/fasm$ ./fasm.x64 bootloader.asm bootloader.bin
flat assembler  version 1.73.32  (16384 kilobytes memory, x64)
2 passes, 512 bytes.

The test with qemu tool:

mythcat@localhost:~/fasm$ qemu-system-x86_64 -drive format=raw,file=bootloader.bin

Let's see the source code:

; Simple Bootloader with Menu for QEMU
; Written in FASM

org 0x7C00

format binary

start:
    ; Clear the screen
    xor ax, ax
    mov ds, ax
    mov es, ax
    mov ah, 0x0
    int 0x10

    ; Display the menu
    call display_menu

main_loop:
    ; Wait for key press
    call wait_for_input

    ; Check key pressed
    cmp al, '1'
    je handle_option1
    cmp al, '2'
    je handle_option2

    ; Invalid option, restart
    jmp main_loop

handle_option1:
    ; Option 1 selected
    mov si, option1_msg
    call display_message
    call wait_for_input  ; Wait for any key
    jmp start           ; Return to menu

handle_option2:
    ; Option 2 selected
    mov si, option2_msg
    call display_message
    call wait_for_input  ; Wait for any key
    jmp start           ; Return to menu

display_menu:
    ; Display the menu
    mov si, menu
    call print_string
    ret

wait_for_input:
    ; Wait for a key press
    xor ax, ax
    int 0x16
    ret

print_string:
    ; Print string at DS:SI
    mov ah, 0x0E
@@:
    lodsb
    test al, al
    jz @f
    int 0x10
    jmp @b
@@:
    ret

display_message:
    ; Print message at DS:SI
    call print_string
    ret

menu db 'Simple Bootloader Menu', 13, 10
     db '1. Option 1', 13, 10
     db '2. Option 2', 13, 10
     db 'Select an option: ', 0

option1_msg db 13, 10, 'You selected Option 1!', 13, 10
           db 'Press any key to return to menu...', 13, 10, 0

option2_msg db 13, 10, 'You selected Option 2!', 13, 10
           db 'Press any key to return to menu...', 13, 10, 0

rb 510-($-$$)
db 0x55, 0xAA

This is the result: