| 1 | ; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
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| 2 | ;
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| 3 | ; This file is part of AiR-BOOT
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| 4 | ;
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| 5 | ; AiR-BOOT is free software: you can redistribute it and/or modify it under
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| 6 | ; the terms of the GNU General Public License as published by the Free
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| 7 | ; Software Foundation, either version 3 of the License, or (at your option)
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| 8 | ; any later version.
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| 9 | ;
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| 10 | ; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
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| 11 | ; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
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| 12 | ; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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| 13 | ; details.
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| 14 | ;
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| 15 | ; You should have received a copy of the GNU General Public License along with
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| 16 | ; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
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| 17 | ;
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| 18 | ;---------------------------------------------------------------------------
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| 19 | ; AiR-BOOT / CHARSET SUPPORT
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| 20 | ;---------------------------------------------------------------------------
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| 21 |
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| 22 | ; This file is only included, when compiling versions that are meant to
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| 23 | ; contain special characters that are not included in the Video ROM charset.
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| 24 |
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| 25 | ; May destroy all-purpose registers (AX,BX,CX,DX), will preserve all others
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| 26 | CHARSET_IncludeCyrillic Proc Near Uses si di bp
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| 27 | ; First we get the ROM charset from BIOS...
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| 28 | mov ax, 1130h
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| 29 | mov bh, 6 ; Get ROM VGA 25x80 charset
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| 30 | int 10h ; VIDEO BIOS: Get charset table pointer
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| 31 | mov bx, ds ; ES:BP point to charset (in Video-ROM)
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| 32 | mov ax, es
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| 33 | mov es, bx
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| 34 | mov ds, ax
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| 35 | mov si, bp ; DS:SI - ROM Font 25x80 and ES==CS
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| 36 | mov di, offset CharsetTempBuffer
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| 37 | mov cx, 2048
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| 38 | rep movsw ; Copy ROM-charset to Temp-Buffer
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| 39 | mov ds, bx ; DS==CS
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| 40 | mov si, offset CHARSET_Cyrillic
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| 41 | mov di, offset CharSetTempBuffer+2048
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| 42 |
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| 43 | mov dl, 64 ; Decode 64 character bitmaps
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| 44 | xor al, al
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| 45 | xor ch, ch
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| 46 | DecodeLoop: ; This is an uncompressing-loop
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| 47 | mov ah, ds:[si]
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| 48 | inc si
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| 49 | mov cl, ah
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| 50 | and cl, 0Fh
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| 51 | rep stosb ; Write NULs, count: lower 4 bits
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| 52 | mov cl, ah
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| 53 | shr cl, 4
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| 54 | or cl, cl
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| 55 | jz EndOfStream
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| 56 | rep movsb
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| 57 | jmp DecodeLoop
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| 58 | EndOfStream:
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| 59 | cmp di, offset CharSetTempBuffer+3840
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| 60 | jae DecodeDone
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| 61 | add di, 768 ; Skip 3x16 char blocks
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| 62 | jmp DecodeLoop
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| 63 | DecodeDone:
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| 64 | call FX_WaitRetrace ; Wait for retrace to reduce flickering
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| 65 | mov ax, 1110h
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| 66 | mov bh, 16
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| 67 | xor bl, bl
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| 68 | mov cx, 0FFh
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| 69 | xor dx, dx
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| 70 | mov bp, offset CharSetTempBuffer ; ES:BP - New charset
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| 71 | int 10h ; VIDEO BIOS: Set new charset table
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| 72 | mov ah, 12h
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| 73 | mov bl, 30h
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| 74 | mov al, 2 ; 400 ScanLines
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| 75 | int 10h ; VIDEO BIOS: Set Scanlines
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| 76 | ret
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| 77 | CHARSET_IncludeCyrillic EndP
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