333 lines
4.6 KiB
NASM
333 lines
4.6 KiB
NASM
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;void writeCursorPosition(dword pos);
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;dword getCursorPosition();
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[global _writeCursorPosition]
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[global _getCursorPosition]
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[global _putc]
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[global _printf]
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[global _console_scroll]
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[global _console_cls]
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[global _putHex]
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[global _putDec]
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;
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;void writeCursorPosition(int position)
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;
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_writeCursorPosition:
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push ebp
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mov ebp, esp
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push ebx
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push edx
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mov eax, [ebp+8] ;cursor position in ax
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mov bl, al
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mov dx, 0x03D4
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mov al, 0x0E
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out dx, al
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inc dx
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mov al, ah
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out dx, al
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dec dx
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mov al, 0x0F
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out dx, al
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inc dx
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mov al, bl
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out dx, al
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pop edx
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pop ebx
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pop ebp
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ret
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;
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;word getCursorPosition()
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;
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_getCursorPosition:
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push ebx
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push edx
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xor eax, eax
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mov dx, 0x03D4
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mov al, 0x0E
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out dx, al
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inc dx
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in al, dx
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mov bl, al
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dec dx
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mov al, 0x0F
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out dx, al
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inc dx
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in al, dx
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mov ah, bl
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pop edx
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pop ebx
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ret
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;
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;void putc(int chr)
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;
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_putc:
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push ebp
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mov ebp, esp
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push ebx
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push ecx
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push edx
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call _getCursorPosition
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mov ebx, eax
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mov ecx, ebx
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mov eax, [ebp+8] ;al=character
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cmp al, 10 ;newline
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jz putc_newline
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cmp al, 9 ;tab
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jz putc_tab
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shl ebx, 1
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add ebx, 0xb8000
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mov ah, 0x07
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mov [ebx], ax
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mov eax, ecx
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inc eax
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cmp eax, 2000
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jnz putc_writeit2
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call _console_scroll
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mov eax, 2000-80
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putc_writeit2:
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push eax
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call _writeCursorPosition
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add esp, 4
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jmp putc_done
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putc_newline:
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mov eax, ebx ;eax = cursor position
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mov ebx, 80
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xor edx, edx
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div bx ;ax=dx:ax/bx, dx=remainder
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mov bx, 80
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sub bx, dx
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mov eax, ecx
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add eax, ebx ;eax = new cursor position
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cmp eax, 2000
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jnz putc_newline_writeit2
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call _console_scroll
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mov eax, 2000-80 ;beginning of last row
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putc_newline_writeit2:
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push eax
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call _writeCursorPosition
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add esp, 4
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jmp putc_done
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putc_tab:
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mov eax, ebx ;eax = cursor position
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mov ebx, 8
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div bl ;al=ax/bl, ah=remainder
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xor edx, edx
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mov dl, ah
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mov bx, 8
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sub bx, dx
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mov eax, ecx
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add eax, ebx ;eax = new cursor position
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cmp eax, 2000
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jnz putc_tab_writeit2
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call _console_scroll
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mov eax, 2000-80 ;beginning of last row
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putc_tab_writeit2:
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push eax
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call _writeCursorPosition
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add esp, 4
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putc_done:
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pop edx
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pop ecx
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pop ebx
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pop ebp
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ret
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;
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;void printf(char *fmt, ... )
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;
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_printf:
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push ebp
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mov ebp, esp
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pusha
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mov ebx, [ebp+8] ;ebx = ptr in format string
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mov esi, ebp
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add esi, 12 ;esi = ptr to next variable arg
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xor ecx, ecx ;ecx used if we encounter a '%'
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printf_loop:
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mov al, [ebx]
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inc ebx
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cmp al, 0
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jz printf_done
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cmp al, '%'
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jz printf_percent
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cmp ecx, 1
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jz printf_special
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push eax
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call _putc
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add esp, 4
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jmp printf_loop
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printf_special:
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xor ecx, ecx
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cmp al, 'd'
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jz printf_decimal
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cmp al, 'x'
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jz printf_hex
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cmp al, '%'
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jz printf_ppercent
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jmp printf_special_done
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printf_decimal:
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mov eax, [esi]
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push eax
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call _putDec
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add esp, 4
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jmp printf_special_done
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printf_hex:
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mov eax, [esi]
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push eax
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call _putHex
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add esp, 4
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jmp printf_special_done
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printf_ppercent:
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push eax
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call _putc
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add esp, 4
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jmp printf_special_done
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printf_special_done
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add esi, 4 ;point to next extra argument
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jmp printf_loop
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printf_percent:
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mov ecx, 1
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jmp printf_loop
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printf_done:
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popa
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pop ebp
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ret
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;
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;void console_scroll()
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;
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_console_scroll:
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pusha
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mov esi, 0xb8000+160
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mov edi, 0xb8000
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mov ecx, 960 ;(2000-80)/2
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console_scroll_loop:
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lodsd
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stosd
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loop console_scroll_loop
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mov ax, 0x0720
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mov ecx, 80
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console_scroll_loop2:
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stosw
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loop console_scroll_loop2
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popa
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ret
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;
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;void console_cls()
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;
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_console_cls:
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pusha
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mov edi, 0xb8000
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mov ax, 0x0720
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mov ecx, 2000
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console_cls_loop:
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stosw
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loop console_cls_loop
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push dword 0
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call _writeCursorPosition
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add esp, 4
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popa
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ret
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;
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;void putHex(dword number)
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;
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_putHex:
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push ebp
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mov ebp, esp
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pusha
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mov eax, [ebp+8] ;eax = number to print
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xor ebx, ebx ;we have not printed a character yet
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mov ecx, 8 ;counter for number of characters
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putHex_loop:
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push eax
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push ecx
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dec ecx
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shl ecx, 2 ;edx=counter*4 (amount to shift by)
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shr eax, cl
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and eax, 0x0F
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cmp cl, 0
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jz putHex_notzero ;if number is 0
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cmp al, 0
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jnz putHex_notzero
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cmp bl, 0
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jz putHex_loop_end
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putHex_notzero:
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mov bl, 1
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add eax, '0'
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cmp eax, '9'
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jbe putHex_dontadjust
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add eax, 'A'-'9'-1
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putHex_dontadjust:
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push eax
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call _putc
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add esp, 4
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putHex_loop_end:
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pop ecx
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pop eax
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loop putHex_loop
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popa
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pop ebp
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ret
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;
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;void putDec(dword number)
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;
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_putDec:
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ret
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