| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for register operations.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 |
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| 21 | ; Section containing code
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| 22 | SECTION .text
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| 23 |
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| 24 | ;--------------------------------------------------------------------
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| 25 | ; Math_DivQWatSSBPbyCX
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| 26 | ; Parameters:
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| 27 | ; [SS:BP]: 64-bit unsigned divident
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| 28 | ; CX: 16-bit unsigned divisor
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| 29 | ; Returns:
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| 30 | ; [SS:BP]: 64-bit unsigned quotient
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| 31 | ; DX: 16-bit unsigned remainder
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| 32 | ; Corrupts registers:
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| 33 | ; AX
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| 34 | ;--------------------------------------------------------------------
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| 35 | %ifndef EXCLUDE_FROM_XTIDECFG ; Not used in XTIDECFG
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| 36 | ALIGN JUMP_ALIGN
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| 37 | Math_DivQWatSSBPbyCX:
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| 38 | xor dx, dx
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| 39 | mov ax, [bp+6] ; Load highest divident WORD to DX:AX
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| 40 | div cx
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| 41 | mov [bp+6], ax ; Store quotient
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| 42 |
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| 43 | mov ax, [bp+4]
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| 44 | div cx
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| 45 | mov [bp+4], ax
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| 46 |
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| 47 | mov ax, [bp+2]
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| 48 | div cx
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| 49 | mov [bp+2], ax
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| 50 |
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| 51 | mov ax, [bp]
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| 52 | div cx
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| 53 | mov [bp], ax
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| 54 | ret
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| 55 | %endif
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| 56 |
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| 57 |
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| 58 | ;--------------------------------------------------------------------
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| 59 | ; Math_DivDXAXbyCX
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| 60 | ; Parameters:
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| 61 | ; DX:AX: 32-bit unsigned divident
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| 62 | ; CX: 16-bit unsigned divisor
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| 63 | ; Returns:
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| 64 | ; DX:AX: 32-bit unsigned quotient
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| 65 | ; BX: 16-bit unsigned remainder
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| 66 | ; Corrupts registers:
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| 67 | ; Nothing
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| 68 | ;--------------------------------------------------------------------
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| 69 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
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| 70 | ALIGN JUMP_ALIGN
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| 71 | Math_DivDXAXbyCX: ; This is currently unused (dead code)
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| 72 | xor bx, bx
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| 73 | xchg bx, ax
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| 74 | xchg dx, ax
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| 75 | div cx
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| 76 | xchg ax, bx
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| 77 | div cx
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| 78 | xchg dx, bx
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| 79 | ret
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| 80 | %endif
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