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Diffstat (limited to 'stand/pc98/boot0.5/syscons.s')
| -rw-r--r-- | stand/pc98/boot0.5/syscons.s | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/stand/pc98/boot0.5/syscons.s b/stand/pc98/boot0.5/syscons.s new file mode 100644 index 0000000..150b835 --- /dev/null +++ b/stand/pc98/boot0.5/syscons.s @@ -0,0 +1,253 @@ +# Copyright (c) KATO Takenori, 1999, 2000. +# +# All rights reserved. Unpublished rights reserved under the copyright +# laws of Japan. +# +# 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 as +# the first lines of this file unmodified. +# 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 ``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 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. +# +# $FreeBSD$ +# + + .code16 + + .text +# +# %al character code +# destroyed: %al, %bx +# +put_character: + movw $0xe000, %bx + movb ishireso, %ah + orb %ah, %ah + jne hireso_ch + movw $0xa000, %bx +hireso_ch: + movw %bx, %es + xorb %ah, %ah + movw curpos, %bx + movw %ax, %es:(%bx) + xorw %ax, %ax + movw %ax, %es + ret + +# +# %al attribute +# destroyed: %ah, %cx +# +set_attribute: + movw $0xe200, %bx + movb ishireso, %ah + orb %ah, %ah + jne hireso_ch + movw $0xa200, %bx +hireso_attr: + movw %bx, %es + xorb %ah, %ah + movw curpos, %bx + movw %ax, %es:(%bx) + xorw %bx, %bx + movw %bx, %es + ret + +# +# Put a character +# %al: character code +# destroyed: %ah, %bx, %cx +# + .global sc_putc +sc_putc: + call put_character + incw curpos + incw curpos + cmpw $4000, curpos + jng putc_end + movw $0, curpos +putc_end: + ret + +# +# Put a null terminated string +# %di: pointer to string +# destroyed: %ah, %cx, %di +# + .global sc_puts +sc_puts: + movb (%di), %al + orb %al, %al + jz puts_end + call sc_putc + incw %di + jmp sc_puts +puts_end: + ret + +# +# Change the current cursor position +# %cx: X +# %dx: Y +# destroyed: %ax, %bx +# + .global sc_goto +sc_goto: + movw %dx, %ax # AX=Y + shlw %ax # AX=Y*64 + shlw %ax + shlw %ax + shlw %ax + shlw %ax + shlw %ax + movw %dx, %bx # BX=Y + shlw %bx # BX=Y*16 + shlw %bx + shlw %bx + shlw %bx + addw %bx, %ax # AX=Y*64+Y*16=Y*80 + addw %cx, %ax + shlw %ax + movw %ax, curpos + ret + +# +# Clear screen +# destroyed: %ax, %bx +# + .global sc_clean +sc_clean: + movb $0x16, %ah + movw $0xe120, %dx + int $0x18 # KBD/CRT BIOS + movw $0, curpos + ret + +# +# Set sttribute code +# %al: attribute +# %cx: count +# destroyed: %ax, %bx, %cx +# + .global sc_setattr +sc_setattr: + call set_attribute + incw curpos + incw curpos + loop sc_setattr + +# +# Sense the state of shift key +# destroyed: %ax +# + .global sc_getshiftkey +sc_getshiftkey: + movb $2, %ah # Sense KB_SHIFT_COD + int $0x18 # KBD/CRT BIOS + xorb %ah, %ah + ret + +# +# Check KBD buffer +# + .global sc_iskeypress +sc_iskeypress: + mov $1, %ah + int $0x18 # KBD/CRT BIOS + testb $1, %bh + jz no_key + movw $1, %ax + ret +no_key: + xorw %ax, %ax + ret + +# +# Read from KBD +# + .global sc_getc +sc_getc: + xorb %ah, %ah + int $0x18 + ret + +# +# Initialize CRT (normal mode) +# +init_screen_normal: + # Disable graphic screen + movb $0x41, %ah + int $0x18 + # Init graphic screen + movb $0x42, %al + movb $0xc0, %ch + int $0x18 + # 80x25 mode + movw $0x0a00, %ax + int $0x18 + ret + +# +# Initialize CRT (hireso mode) +# +init_screen_hireso: + # Init RAM window + movb $8, %al + outb %al, $0x91 + movb $0x0a, %al + outb %al, $0x93 + # 80x31 mode + movw $0x0a00, %ax + int $0x18 + ret + +# +# Initialize screen (internal) +# +init_screen: + movb ishireso, %ah + orb %ah, %ah + jne hireso_ini + call init_screen_normal + jmp init_next +hireso_ini: + call init_screen_hireso +init_next: + movb $0x0c, %ah + int $0x18 + # cursor home and off + xorw %dx, %dx + movb $0x13, %ah + int $0x18 + movb $0x12, %ah + int $0x18 + ret + +# +# Initialize screeen +# + .global sc_init +sc_init: + call init_screen + call sc_clean + movw $0, curpos + ret + + .data +curpos: .word 0 # Current cursor position |
