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Diffstat (limited to 'stand/pc98/kgzldr/crt.s')
| -rw-r--r-- | stand/pc98/kgzldr/crt.s | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/stand/pc98/kgzldr/crt.s b/stand/pc98/kgzldr/crt.s new file mode 100644 index 0000000..35c1fc2 --- /dev/null +++ b/stand/pc98/kgzldr/crt.s @@ -0,0 +1,89 @@ +# +# 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 +# $FreeBSD$ +# + +# Screen defaults and assumptions. + + .set SCR_MAT,0xe1 # Mode/attribute + .set SCR_COL,0x50 # Columns per row + .set SCR_ROW,0x19 # Rows per screen + +# BIOS Data Area locations. + + .set BDA_POS,0x53e # 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 $0xa0000,%edi +crt_putchr.1: cmpb $0xa,%al # New line? + je crt_putchr.2 # Yes + movw %dx,%cx + movb %al,(%edi,%ecx,1) # Write char + addl $0x2000,%ecx + movb %ah,(%edi,%ecx,1) # Write attr + addw $0x02,%dx + jmp crt_putchr.3 +crt_putchr.2: movw %dx,%ax + movb $SCR_COL*2,%dl + div %dl + incb %al + mul %dl + movw %ax,%dx +crt_putchr.3: cmpw $SCR_ROW*SCR_COL*2,%dx + 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 + xorb %ah,%ah + movb $SCR_COL,%cl # Columns to clear + rep # Clear + stosw # line + movw $(SCR_ROW-1)*SCR_COL*2,%dx +crt_putchr.4: movw %dx,(%ebx) # Update position + shrw $1,%dx +crt_putchr.5: inb $0x60,%al # Move cursor + testb $0x04,%al + jz crt_putchr.5 + movb $0x49,%al + outb %al,$0x62 + movb %dl,%al + outb %al,$0x60 + movb %dh,%al + outb %al,$0x60 + popa # Restore + ret # To caller |
