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.
451 lines
8.0 KiB
ArmAsm
451 lines
8.0 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 Unpublished rights reserved under the copyright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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.code16
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.text
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#
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# Display partition table.
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#
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showpartitions:
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# Clear partion table area
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movw $16, %cx
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clear_part:
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push %cx
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movw %cx, %dx
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decw %dx
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addw $5, %dx
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movw $20, %cx
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call sc_goto
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movw $msg_spc, %di
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call sc_puts
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pop %cx
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loop clear_part
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# Check `Exit' menu
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movw curdevice, %ax
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cmpw ndevice, %ax
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je no_slice
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# XXX Move this to a suitable place!
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movw $22, %cx
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movw $4, %dx
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call sc_goto
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movw $msg_slice, %di
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call sc_puts
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# Check the number of partitions
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movw npartition, %cx
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orw %cx, %cx
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jnz partitionexist
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no_slice:
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# Just show the `no slice' message.
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movw $22, %cx
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movw $5, %dx
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call sc_goto
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movw $msg_noslice, %di
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call sc_puts
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ret
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partitionexist:
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xorw %si, %si # %si = partition number
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showpart_loop:
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push %cx # %cx = number of partitions
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movw $22, %cx
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movw %si, %dx
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addw $5, %dx
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call sc_goto
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movw %si, %di
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movb $5, %cl
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shlw %cl, %di
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addw $0x10, %di # SYSM field
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# SYSM: space filled string. Don't use sc_puts.
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movw $16, %cx
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showpart_name:
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push %cx
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movb parttable(%di), %al
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call sc_putc
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incw %di
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pop %cx
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loop showpart_name
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incw %si
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pop %cx
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loop showpart_loop
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ret
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#
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# Show default slice indicator
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# If the default boot slice exists, `*' indicator will be showed.
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#
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showdefaultslicemark:
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cmpb $0x80, defpartflag
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je defpartexist
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ret
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defpartexist:
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movw npartition, %cx
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defslice_loop:
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movw %cx, %bx
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decw %bx
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push %cx
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push %bx
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movw $40, %cx
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movw %bx, %dx
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addw $5, %dx
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call sc_goto
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pop %bx
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pop %cx
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movb defpartnum, %al
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cmpb partnum(%bx), %al
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jne nomatch
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movb $'*', %al
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call sc_putc
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jmp defslice_done
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nomatch:
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movb $' ', %al
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call sc_putc
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defslice_done:
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loop defslice_loop
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ret
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#
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# Hide default slice indicator
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#
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hidedefaultslicemark:
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movw $16, %cx
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hidedefslice_loop:
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push %cx
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movw %cx, %dx
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addw $4, %dx
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movw $40, %cx
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call sc_goto
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movb $' ', %al
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call sc_putc
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pop %cx
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loop hidedefslice_loop
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ret
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#
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# Toggle default slice
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#
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toggle_default:
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cmpb $0x80, defpartflag
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jne set_default
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# Clear default
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movb $0, defpartflag
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call write_ipl # Restore
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call hidedefaultslicemark
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ret
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# Set default slice
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set_default:
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movw curpartition, %si
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movb partnum(%si), %al # %al = real partition number
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movb $5, %cl
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shlw %cl, %si
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# Default slice must be bootable
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testb $0x80, parttable(%si)
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jnz curpart_bootable
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# Current partition is not bootable.
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ret
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curpart_bootable:
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movb $0x80, defpartflag
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movb %al, defpartnum
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call write_ipl # Restore
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call showdefaultslicemark
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ret
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#
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# Show/hide cursor
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#
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show_devcurs:
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xorw %cx, %cx
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movw curdevice, %dx
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addw $5, %dx
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call sc_goto
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movb $'>', %al
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call sc_putc
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movb $'>', %al
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call sc_putc
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ret
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hide_devcurs:
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xorw %cx, %cx
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movw curdevice, %dx
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addw $5, %dx
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call sc_goto
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movb $' ', %al
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call sc_putc
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movb $' ', %al
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call sc_putc
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ret
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show_slicecurs:
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movw $20, %cx
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movw curpartition, %dx
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addw $5, %dx
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call sc_goto
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movb $'>', %al
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call sc_putc
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movb $'>', %al
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call sc_putc
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ret
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hide_slicecurs:
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movw $20, %cx
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movw curpartition, %dx
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addw $5, %dx
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call sc_goto
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movb $' ', %al
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call sc_putc
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movb $' ', %al
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call sc_putc
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ret
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isforceboot:
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xorw %cx, %cx
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movw $20, %dx
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call sc_goto
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movw $msg_force, %di
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call sc_puts
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call sc_getc
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push %ax
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xorw %cx, %cx
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movw $20, %dx
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call sc_goto
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movw $msg_forceclr, %di
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call sc_puts
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pop %ax
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cmpb $0x15, %ah
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je force_yes
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xorw %ax, %ax
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ret
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force_yes:
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movw $1, %ax
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ret
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#
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# Main loop for device mode
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#
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devmode:
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call read_ipl
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call hidedefaultslicemark
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call showpartitions
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call showdefaultslicemark
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call show_devcurs
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movw $2, %cx
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movw $4, %dx
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call sc_goto
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movb $0xe5, %al
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movw $6, %cx
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call sc_setattr
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movw $22, %cx
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movw $4, %dx
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call sc_goto
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movb $0xe1, %al
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movw $5, %cx
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call sc_setattr
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movw $44, %cx
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movw $3, %dx
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call sc_goto
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movb $0xe5, %al
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movw $11, %cx
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call sc_setattr
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movw $44, %cx
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movw $7, %dx
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call sc_goto
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movb $0xe1, %al
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movw $10, %cx
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call sc_setattr
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devmode_loop:
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call sc_getc
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movw ndevice, %bx
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cmpb $0x3a, %ah # UP
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je dev_up
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cmpb $0x3d, %ah # DOWN
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je dev_down
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cmpb $0x3c, %ah # RIGHT
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je dev_right
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cmpb $0x1c, %ah # RETURN
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jne devmode_loop
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cmpw curdevice, %bx
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jne dev_right
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movw $3, mode # N88-BASIC
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ret
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# XXX
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.space 5, 0x90
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ret # Dummy ret @0x9ab
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dev_up:
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cmpw $0, curdevice
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je devmode_loop
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call hide_devcurs
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decw curdevice
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call read_ipl
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call hidedefaultslicemark
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call showpartitions
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call showdefaultslicemark
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call show_devcurs
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jmp devmode_loop
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dev_down:
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cmpw curdevice, %bx
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je devmode_loop
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call hide_devcurs
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incw curdevice
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call read_ipl
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call hidedefaultslicemark
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call showpartitions
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call showdefaultslicemark
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call show_devcurs
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jmp devmode_loop
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dev_right:
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cmpw curdevice, %bx
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je devmode_loop
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movw $1, mode # Slice mode
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ret
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#
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# main loop for slice mode
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#
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slicemode:
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movw $0, curpartition
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call show_slicecurs
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movw $2, %cx
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movw $4, %dx
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call sc_goto
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movb $0xe1, %al
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movw $6, %cx
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call sc_setattr
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movw $22, %cx
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movw $4, %dx
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call sc_goto
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movb $0xe5, %al
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movw $5, %cx
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call sc_setattr
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movw $44, %cx
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movw $3, %dx
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call sc_goto
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movb $0xe1, %al
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movw $11, %cx
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call sc_setattr
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movw $44, %cx
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movw $7, %dx
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call sc_goto
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movb $0xe5, %al
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movw $10, %cx
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call sc_setattr
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slicemode_loop:
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call sc_getc
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cmpb $0x3a, %ah # UP
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je slice_up
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cmpb $0x3d, %ah # DOWN
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je slice_down
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cmpb $0x3b, %ah # LEFT
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je slice_esc
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cmpb $0x00, %ah # ESC
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je slice_esc
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cmpb $0x1c, %ah # RETURN
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je slice_ret
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cmpb $0x34, %ah # SPC
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je slice_spc
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cmpb $0x62, %ah # f1
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je slice_spc
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jmp slicemode_loop
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slice_up:
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cmpw $0, curpartition
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je slicemode_loop
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call hide_slicecurs
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decw curpartition
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call show_slicecurs
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jmp slicemode_loop
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slice_down:
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movw curpartition, %bx
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movw npartition, %ax
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decw %ax
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cmpw %bx, %ax
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je slicemode_loop
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call hide_slicecurs
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incw curpartition
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call show_slicecurs
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jmp slicemode_loop
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slice_esc:
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movw $0, mode # Device mode
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ret
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slice_spc:
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call toggle_default
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jmp slicemode_loop
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slice_ret:
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# Test bit 7 of mid
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movw curpartition, %si
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movb $5, %cl
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shlw %cl, %si
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testb $0x80, parttable(%si)
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jnz bootable_slice
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call isforceboot
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orw %ax, %ax
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jz slicemode_loop
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bootable_slice:
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call boot
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jmp slicemode_loop
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#
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# Main loop
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#
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.global selector
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selector:
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movw $0, curdevice # trydefault may change the curdevice.
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movw $0, mode
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selector_loop:
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cmpw $0, mode
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je status_dev
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cmpw $1, mode
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je status_slice
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ret
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status_dev:
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call devmode
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jmp selector_loop
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status_slice:
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call slicemode
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jmp selector_loop
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.data
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.global curpartition
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curpartition: .word 0 # current patition
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mode: .word 0
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msg_spc: .asciz " "
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msg_slice: .asciz "Slice"
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msg_noslice: .asciz "no slice"
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msg_force: .asciz "This slice is not bootable. Continue? (Y / [N])"
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msg_forceclr: .asciz " "
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