5b2161e51b
- Added magic numbers to pretend the NEC original program version
2.70.
- Added string display routine with Shift-JIS code support.
- Added three nop instructions at start1 in start.s since the
installaer of the IPLware put 'call $0x09ab' instruction.
- Put the near return instruction at 0x9ab in selector.s.
Since the Shit-JIS display routine must be located at 0x1243, the
linker script file (ldscript) is applied.
138 lines
3.2 KiB
ArmAsm
138 lines
3.2 KiB
ArmAsm
# Copyright (c) KATO Takenori, 2007.
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#
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# All rights reserved. Unpublished rights reserved under the copyright
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# laws of Japan.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer as
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# the first lines of this file unmodified.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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.code16
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.section .putssjis, "awx", @progbits
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#
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# Display string with Shift-JIS support
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# %si: addres of string, %di: T-VRAM address, %cx: count
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#
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# Absolute address of putssjis_entry must be 0x1243.
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putssjis_entry:
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push %es
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push %ax
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# Setup the T-VRAM segement address.
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xorw %ax, %ax
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movw %ax, %es
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movw $0xa000, %ax
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testb $0x08, %es:0x501
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jz normalmode
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movw $0xe000, %ax
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normalmode:
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movw %ax, %es
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putssjis_loop:
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lodsw
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call check_sjis
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jc put_2byte_char
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# 1 byte character
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xorb %ah, %ah
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testb $0xe0, %al # Check control code.
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jnz put_1byte_char
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movb $0x20, %al # Convert control code into the space.
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put_1byte_char:
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stosw
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decw %si
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jmp putssjis_loop_end
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put_2byte_char:
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subb $0x20, %al
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# Check 2byte "hankaku"
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cmp $0x09, %al
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je put_2byte_hankaku
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cmp $0x0a, %al
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je put_2byte_hankaku
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cmp $0x0b, %al
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je put_2byte_hankaku
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jmp put_2byte_zenkaku
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put_2byte_hankaku:
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stosw
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jmp putssjis_loop_end
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put_2byte_zenkaku:
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stosw
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orb $0x80, %ah
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stosw
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decw %cx
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putssjis_loop_end:
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loop putssjis_loop
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pop %ax
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pop %es
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ret
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# Check 2-byte code.
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check_sjis:
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cmpb $0x80, %al
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jbe found_ank_kana
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cmpb $0xa0, %al
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jb found_2byte_char
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cmpb $0xe0, %al
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jb found_ank_kana
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cmpb $0xf0, %al
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jae found_ank_kana
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jmp found_2byte_char
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found_ank_kana:
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clc
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ret
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found_2byte_char:
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# Convert Shift-JIS into JIS.
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cmpb $0x9f, %al
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ja sjis_h_2 # Upper > 0x9f
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subb $0x71, %al # Upper -= 0x71
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jmp sjis_lower
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sjis_h_2:
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subb $0xb1, %al # Upper -= 0xb1
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sjis_lower:
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salb %al # Upper *= 2
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incb %al # Upper += 1
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cmpb $0x7f, %ah
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jbe sjis_l_2
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decb %ah # Lower -= 1 if lower > 0x7f
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sjis_l_2:
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cmpb $0x9e, %ah
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jb sjis_l_3
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subb $0x7d, %ah # Lower -= 0x7d
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incb %al # Upper += 1
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jmp check_2byte_end
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sjis_l_3:
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subb $0x1f, %ah # Lower -= 0x1f
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check_2byte_end:
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stc
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ret
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