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on this file since 80238 was 76553, checked in by vboxsync, 6 years ago |
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1 | ; $Id: __I4D.asm 76553 2019-01-01 01:45:53Z vboxsync $
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2 | ;; @file
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3 | ; Compiler support routines.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2012-2019 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 |
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18 |
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19 | ;*******************************************************************************
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20 | ;* Exported Symbols *
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21 | ;*******************************************************************************
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22 | public __I4D
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23 |
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24 | if VBOX_BIOS_CPU lt 80386
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25 | extrn NeedToImplementOn8086__I4D:near
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26 | endif
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27 |
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28 | .8086
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29 |
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30 |
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31 | _TEXT segment public 'CODE' use16
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32 | assume cs:_TEXT
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33 |
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34 | ;;
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35 | ; 32-bit signed division.
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36 | ;
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37 | ; @param dx:ax Dividend.
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38 | ; @param cx:bx Divisor.
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39 | ; @returns dx:ax Quotient.
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40 | ; cx:bx Remainder.
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41 | ;
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42 | __I4D:
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43 | pushf
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44 | if VBOX_BIOS_CPU ge 80386
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45 | .386
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46 | push eax
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47 | push edx
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48 | push ecx
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49 |
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50 | rol eax, 16
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51 | mov ax, dx
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52 | ror eax, 16
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53 | xor edx, edx
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54 |
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55 | shr ecx, 16
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56 | mov cx, bx
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57 |
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58 | idiv ecx ; eax:edx / ecx -> eax=quotient, edx=remainder.
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59 |
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60 | mov bx, dx
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61 | pop ecx
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62 | shr edx, 16
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63 | mov cx, dx
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64 |
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65 | pop edx
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66 | ror eax, 16
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67 | mov dx, ax
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68 | add sp, 2
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69 | pop ax
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70 | rol eax, 16
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71 | .8086
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72 | else
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73 | call NeedToImplementOn8086__I4D
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74 | endif
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75 | popf
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76 | ret
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77 |
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78 |
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79 | _TEXT ends
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80 | end
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81 |
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