ack/plat/rpi/libsys/_sys_rawwrite.s

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#
/*
* Raspberry Pi support library for the ACK
* © 2013 David Given
* This file is redistributable under the terms of the 3-clause BSD license.
* See the file 'Copying' in the root of the distribution for the full text.
*/
! Declare segments (the order is important).
.sect .text
.sect .rom
.sect .data
.sect .bss
.sect .text
! Writes a single byte to the console.
.define __sys_rawwrite
.extern __sys_rawwrite
__sys_rawwrite:
push bp
mov bp, sp
movb al, 4(bp)
movb ah, 0x0E
mov bx, 0x0007
int 0x10
jmp .cret