78 lines
943 B
NASM
78 lines
943 B
NASM
; AX = key pressed
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os_read_input:
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mov ah, 11h ; BIOS call to check for key
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int 16h ; Interrupt
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jnz .key_pressed ; Jump if input isn't 0
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hlt
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jmp os_read_input
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.key_pressed:
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mov ah, 10h
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int 16h
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ret
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; -------------------------------------------
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os_display_input:
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pusha
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mov cx, [prompt_length]
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.loop:
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call .check_key_pressed
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jmp .loop
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.check_key_pressed:
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call os_read_input
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cmp al, 08h
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je .backspace
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cmp al, 0Dh
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je .enter_key
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cmp al, 1Bh
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je .esc_key
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cmp cx, 0
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jb .check_key_pressed
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call .print_current_input
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dec cx
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jmp .check_key_pressed
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.esc_key:
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call power_reboot
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.enter_key:
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mov al, 0
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stosb
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popa
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call os_read_cli
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.backspace:
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call .move_cursor_back ; then .move_cursor_back
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call .loop ; Else .loop
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.move_cursor_back:
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mov ah, 0Eh
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mov al, 08h
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int 10h
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mov al, 20h
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int 10h
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mov al, 08h
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int 10h
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dec di
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jmp os_display_input
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.print_current_input:
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stosb
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mov ah, 0Eh
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int 10h
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ret
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