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# Copyright (c) KATO Takenori, 2007. # # 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 Unpublished rights reserved under the copyright # laws of Japan.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: release/9.1.0/sys/boot/pc98/boot0.5/putssjis.s 168457 2007-04-07 08:37:04Z kato $ # .code16 .section .putssjis, "awx", @progbits # # Display string with Shift-JIS support # %si: addres of string, %di: T-VRAM address, %cx: count # # Absolute address of putssjis_entry must be 0x1243. putssjis_entry: push %es push %ax # Setup the T-VRAM segement address. xorw %ax, %ax movw %ax, %es movw $0xa000, %ax testb $0x08, %es:0x501 jz normalmode movw $0xe000, %ax normalmode: movw %ax, %es putssjis_loop: lodsw call check_sjis jc put_2byte_char # 1 byte character xorb %ah, %ah testb $0xe0, %al # Check control code. jnz put_1byte_char movb $0x20, %al # Convert control code into the space. put_1byte_char: stosw decw %si jmp putssjis_loop_end put_2byte_char: subb $0x20, %al # Check 2byte "hankaku" cmp $0x09, %al je put_2byte_hankaku cmp $0x0a, %al je put_2byte_hankaku cmp $0x0b, %al je put_2byte_hankaku jmp put_2byte_zenkaku put_2byte_hankaku: stosw jmp putssjis_loop_end put_2byte_zenkaku: stosw orb $0x80, %ah stosw decw %cx putssjis_loop_end: loop putssjis_loop pop %ax pop %es ret # Check 2-byte code. check_sjis: cmpb $0x80, %al jbe found_ank_kana cmpb $0xa0, %al jb found_2byte_char cmpb $0xe0, %al jb found_ank_kana cmpb $0xf0, %al jae found_ank_kana jmp found_2byte_char found_ank_kana: clc ret found_2byte_char: # Convert Shift-JIS into JIS. cmpb $0x9f, %al ja sjis_h_2 # Upper > 0x9f subb $0x71, %al # Upper -= 0x71 jmp sjis_lower sjis_h_2: subb $0xb1, %al # Upper -= 0xb1 sjis_lower: salb %al # Upper *= 2 incb %al # Upper += 1 cmpb $0x7f, %ah jbe sjis_l_2 decb %ah # Lower -= 1 if lower > 0x7f sjis_l_2: cmpb $0x9e, %ah jb sjis_l_3 subb $0x7d, %ah # Lower -= 0x7d incb %al # Upper += 1 jmp check_2byte_end sjis_l_3: subb $0x1f, %ah # Lower -= 0x1f check_2byte_end: stc ret