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, 2011-2013 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 | ; Section containing code |
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21 | SECTION .text |
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22 | |
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23 | %ifdef EXCLUDE_FROM_XUB |
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24 | %ifndef MODULE_EBIOS |
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25 | %define EXCLUDE |
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26 | %endif |
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27 | %endif |
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28 | ;-------------------------------------------------------------------- |
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29 | ; Registers_ExchangeDSSIwithESDI |
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30 | ; Parameters |
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31 | ; Nothing |
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32 | ; Returns: |
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33 | ; DS:SI and ES:DI are exchanged. |
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34 | ; Corrupts registers: |
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35 | ; Nothing |
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36 | ;-------------------------------------------------------------------- |
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37 | %ifndef EXCLUDE |
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38 | ALIGN JUMP_ALIGN |
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39 | Registers_ExchangeDSSIwithESDI: |
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40 | push ds |
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41 | push es |
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42 | pop ds |
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43 | pop es |
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44 | xchg si, di |
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45 | ret |
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46 | %endif |
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47 | %undef EXCLUDE |
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48 | |
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49 | |
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50 | ;-------------------------------------------------------------------- |
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51 | ; Registers_CopySSBPtoESDI |
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52 | ; Registers_CopySSBPtoDSSI |
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53 | ; Registers_CopyDSSItoESDI |
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54 | ; Registers_CopyESDItoDSSI |
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55 | ; Parameters |
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56 | ; Nothing |
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57 | ; Returns: |
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58 | ; Copies far pointer to different segment/pointer register pair |
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59 | ; Corrupts registers: |
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60 | ; Nothing |
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61 | ;-------------------------------------------------------------------- |
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62 | %ifdef INCLUDE_MENU_LIBRARY |
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63 | ALIGN JUMP_ALIGN |
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64 | Registers_CopySSBPtoESDI: |
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65 | COPY_SSBP_TO_ESDI |
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66 | ret |
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67 | %endif |
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68 | |
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69 | %ifndef EXCLUDE_FROM_XUB |
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70 | ALIGN JUMP_ALIGN |
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71 | Registers_CopySSBPtoDSSI: |
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72 | COPY_SSBP_TO_DSSI |
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73 | ret |
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74 | |
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75 | ALIGN JUMP_ALIGN |
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76 | Registers_CopyDSSItoESDI: |
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77 | COPY_DSSI_TO_ESDI |
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78 | ret |
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79 | |
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80 | ALIGN JUMP_ALIGN |
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81 | Registers_CopyESDItoDSSI: |
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82 | COPY_ESDI_to_DSSI |
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83 | ret |
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84 | %endif |
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85 | |
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86 | |
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87 | ;-------------------------------------------------------------------- |
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88 | ; Registers_NormalizeESSI |
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89 | ; Registers_NormalizeESDI |
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90 | ; Parameters |
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91 | ; DS:SI or ES:DI: Ptr to normalize |
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92 | ; Returns: |
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93 | ; DS:SI or ES:DI: Normalized pointer |
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94 | ; Corrupts registers: |
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95 | ; AX, CX |
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96 | ; |
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97 | ; Inline of NORMALIZE_FAR_POINTER so that we can share the last 2/3 of the |
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98 | ; routine with Registers_NormalizeFinish. |
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99 | ; |
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100 | ;-------------------------------------------------------------------- |
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101 | %ifndef EXCLUDE_FROM_XUB OR EXCLUDE_FROM_XTIDECFG |
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102 | ALIGN JUMP_ALIGN |
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103 | Registers_NormalizeESSI: |
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104 | mov cx, si |
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105 | and si, BYTE 0Fh |
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106 | jmp SHORT Registers_NormalizeFinish |
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107 | |
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108 | ALIGN JUMP_ALIGN |
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109 | Registers_NormalizeESDI: |
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110 | mov cx, di |
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111 | and di, BYTE 0Fh |
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112 | ;;; fall-through |
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113 | |
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114 | ALIGN JUMP_ALIGN |
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115 | Registers_NormalizeFinish: |
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116 | eSHR_IM cx, 4 |
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117 | mov ax, es |
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118 | add ax, cx |
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119 | mov es, ax |
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120 | ret |
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121 | %endif |
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122 | |
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123 | |
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124 | ;-------------------------------------------------------------------- |
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125 | ; Registers_SetZFifNullPointerInDSSI (commented to save bytes) |
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126 | ; Parameters |
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127 | ; DS:SI: Far pointer |
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128 | ; Returns: |
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129 | ; ZF: Set if NULL pointer in DS:SI |
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130 | ; Corrupts registers: |
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131 | ; Nothing |
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132 | ;-------------------------------------------------------------------- |
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133 | ;ALIGN JUMP_ALIGN |
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134 | ;Registers_SetZFifNullPointerInDSSI: |
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135 | ; push ax |
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136 | ; mov ax, ds |
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137 | ; or ax, si |
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138 | ; pop ax |
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139 | ; ret |
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