Delete boot.asm

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heckeralt 2024-10-06 17:56:13 -04:00
parent 250d845ad2
commit 22c4591465
1 changed files with 0 additions and 86 deletions

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[bits 16] ; Set to 16-bit mode
[org 0x7C00] ; BIOS loads the bootloader at this address
start:
cli ; Disable interrupts
; Clear the screen
call clear_screen
mov si, welcome_message
call print_string_real
command_loop:
mov si, prompt_message
call print_string_real
call read_input
cmp al, 'h' ; Check for 'h' command (help)
je print_help
cmp al, 'q' ; Check for 'q' command (quit)
je quit_terminal
cmp al, 'f' ; Check for 'f' command (heckerfetch)
je heckerfetch
mov si, unknown_command_message
call print_string_real
jmp command_loop ; Repeat the command loop
print_help:
mov si, help_message
call print_string_real
jmp command_loop ; Return to command loop
heckerfetch:
mov si, heckerfetch_message
call print_string_real
jmp command_loop ; Return to command loop
quit_terminal:
mov si, goodbye_message
call print_string_real
jmp hang ; Hang the system
; Function to read a character from keyboard input
read_input:
xor eax, eax ; Clear EAX for reading character input
int 0x16 ; Call BIOS interrupt to read a character into AL
ret ; Return with character in AL
; Function to print a string in real mode using VGA text buffer
print_string_real:
mov edi, 0xb8000 ; VGA text buffer address
.next_char:
lodsb ; Load byte at DS:SI into AL and increment SI
cmp al, 0 ; Check for null terminator
je .done ; If null, we are done
mov [edi], ax ; Write character and attribute (white on black)
add edi, 2 ; Move to next character cell
jmp .next_char ; Repeat for next character
.done:
ret ; Return from function
; Function to clear the screen in real mode
clear_screen:
xor di, di ; Start from the beginning of the VGA buffer
mov cx, 80 * 25 ; Number of characters in a standard text mode screen
mov ax, 0x07 ; Attribute for white on black background
.fill_screen:
stosw ; Store word in [ES:DI] and increment DI by 2
loop .fill_screen ; Repeat until CX is zero
ret ; Return from function
; Data section for messages
welcome_message db 'Welcome to the HeckerOS!', 0
prompt_message db 'Enter command (h for help, q to quit, f for heckerfetch): ', 0
help_message db 'Available commands: h (help), q (quit), f (heckerfetch)', 0
unknown_command_message db 'Unknown command! Try again.', 0
goodbye_message db 'Goodbye!', 0
heckerfetch_message db 'OS: HeckerOS Beta, CPU: HeckerSoft Generic CPU 0GHZ', 'Host: HeckerSoft Unknown Host', 0
; Bootloader signature (must be present)
times 510 - ($ - $$) db 0 ; Fill the rest of the sector with zeros
dw 0xAA55 ; Boot signature
hang:
jmp hang ; Jump to hang indefinitely