f2a081cfe4
- 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.
74 lines
1.9 KiB
ArmAsm
74 lines
1.9 KiB
ArmAsm
# Copyright (c) KATO Takenori, 1999, 2000, 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 Unpublished rights reserved under the copyright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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.global start
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.code16
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.text
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start:
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jmp start1
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# Magic
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.org 0x053, 0x20
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.byte 0x4e, 0x45, 0x43
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.org 0x8f
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.byte 0x32, 0x2e, 0x37, 0x30
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.org 0x2d4
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start1:
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# The instruction 'call 0x9ab' can be here. See also selector.s.
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nop
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nop
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nop
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cli
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movw %cs, %ax
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movw %ax, %ds
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movw %ss, iniss
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movw %sp, inisp
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movw %ax, %ss
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movw $0xfffe, %sp
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sti
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xorw %ax, %ax
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movw %ax, %es
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call main
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cli
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movw %cs:iniss, %ss
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movw %cs:inisp, %sp
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sti
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int $0x1e
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# NOTREACHED
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lret
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.data
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.global iniss, inisp
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iniss: .word 0
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inisp: .word 0
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