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# # Copyright (c) 1999 Global Technology Associates, Inc. # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # # From: btx.s 1.10 1999/02/25 16:27:41 rnordier # $FreeBSD: release/9.1.0/sys/boot/i386/kgzldr/crt.s 103436 2002-09-17 01:49:00Z peter $ # # Screen defaults and assumptions. .set SCR_MAT,0x7 # Mode/attribute .set SCR_COL,0x50 # Columns per row .set SCR_ROW,0x19 # Rows per screen # BIOS Data Area locations. .set BDA_SCR,0x449 # Video mode .set BDA_POS,0x450 # Cursor position .globl crt_putchr # void crt_putchr(int c) crt_putchr: movb 0x4(%esp,1),%al # Get character pusha # Save xorl %ecx,%ecx # Zero for loops movb $SCR_MAT,%ah # Mode/attribute movl $BDA_POS,%ebx # BDA pointer movw (%ebx),%dx # Cursor position movl $0xb8000,%edi # Regen buffer (color) cmpb %ah,BDA_SCR-BDA_POS(%ebx) # Mono mode? jne crt_putchr.1 # No xorw %di,%di # Regen buffer (mono) crt_putchr.1: cmpb $0xa,%al # New line? je crt_putchr.2 # Yes xchgl %eax,%ecx # Save char movb $SCR_COL,%al # Columns per row mulb %dh # * row position addb %dl,%al # + column adcb $0x0,%ah # position shll %eax # * 2 xchgl %eax,%ecx # Swap char, offset movw %ax,(%edi,%ecx,1) # Write attr:char incl %edx # Bump cursor cmpb $SCR_COL,%dl # Beyond row? jb crt_putchr.3 # No crt_putchr.2: xorb %dl,%dl # Zero column incb %dh # Bump row crt_putchr.3: cmpb $SCR_ROW,%dh # Beyond screen? jb crt_putchr.4 # No leal 2*SCR_COL(%edi),%esi # New top line movw $(SCR_ROW-1)*SCR_COL/2,%cx # Words to move rep # Scroll movsl # screen movb $' ',%al # Space movb $SCR_COL,%cl # Columns to clear rep # Clear stosw # line movb $SCR_ROW-1,%dh # Bottom line crt_putchr.4: movw %dx,(%ebx) # Update position popa # Restore ret # To caller