rdos/kernel/dump.asm

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2019-10-12 17:10:39 +02:00
; print a word
; in: ax
print16:
xchg ah,al
call print8
xchg ah,al
; print a byte
; in: al
print8:
push ax ; avoid destroying ah
push bx
xor bx, bx
aam 16 ; high nibble moved into ah, low nibble into al
add ax, 0x3030
push ax
xchg al, ah
call .nib
pop ax
call .nib
pop bx
pop ax
ret
.nib:
cmp al, 0x3a
jl .out
add al, 0x07
.out:
mov dl, al
call console_output
ret
dump:
push ax
push cx
push dx
push bx
mov dl, 0x0A
call console_output
mov dl, 0x0D
call console_output
mov cx, 4
.loop_line:
push cx
push bx
mov ax, bx
call print16
mov dl, ':'
call console_output
mov dl, ' '
call console_output
mov cx, 0x8
.loop_bin:
mov ax, [bx]
xchg al, ah
inc bx
inc bx
call print16
mov dl, ' '
call console_output
loop .loop_bin
pop bx
mov cx, 0x10
.loop_ascii:
mov dl, '.'
cmp byte [bx], 0x20
jc .print
cmp byte [bx], 0x80
jnc .print
mov dl, [bx]
.print:
inc bx
call console_output
loop .loop_ascii
pop cx
mov dl, 0x0A
call console_output
mov dl, 0x0D
call console_output
loop .loop_line
pop bx
pop dx
pop cx
pop ax
ret