1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Int 13h function AH=48h, Get Extended Drive Parameters. |
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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 | ;-------------------------------------------------------------------- |
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24 | ; Int 13h function AH=48h, Get Extended Drive Parameters. |
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25 | ; |
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26 | ; It is not completely clear what this function should return as total sector count in some cases. |
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27 | ; What is certain is that: |
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28 | ; A) Phoenix Enhanced Disk Drive Specification v3.0 says that P-CHS values |
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29 | ; are never returned for drives with more than 15,482,880 sectors (16384*15*63). |
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30 | ; For those drives we can simply return total sector count from |
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31 | ; ATA ID WORDs 60 and 61 (LBA28) or WORDs 100-103 (LBA48). |
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32 | ; B) IBM PC DOS 7.1 fdisk32 displays warning message if P-CHS values multiplied |
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33 | ; together are different than total sector count. Therefore for drives with less |
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34 | ; than or equal 15,482,880 sectors we MUST NOT return total sector count from |
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35 | ; ATA ID WORDs 60 and 61. |
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36 | ; |
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37 | ; Lets take an example. 6 GB Hitachi microdrive reports following values in ATA ID: |
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38 | ; Sector count from WORDs 60 and 61 : 12,000,556 |
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39 | ; Cylinders : 11905 |
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40 | ; Heads : 16 |
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41 | ; Sectors per track : 63 |
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42 | ; |
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43 | ; When multiplying C*H*S we get : 12,000,240 |
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44 | ; So the CHS size is a little bit less than LBA size. But we must use |
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45 | ; the smaller value since C*H*S must equal total sector count! |
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46 | ; |
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47 | ; Now we get to the uncertain area where I could not find any information. |
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48 | ; Award BIOS from 1997 Pentium motherboard returns following values: |
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49 | ; AH=08h L-CHS: 745, 255, 63 (exactly the same as what we return) |
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50 | ; => Total Sector Count: 745*255*63 = 11,968,425 |
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51 | ; AH=48h P-CHS: 11873, 16, 63 |
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52 | ; AH=48h Total Sector Count: 11873* 16*63 = 11,967,984 |
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53 | ; |
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54 | ; Notice how AH=48h returns lesser total sector count than AH=08h! The only |
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55 | ; way I could think of to get 11873 cylinders is to divide AH=08h sector |
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56 | ; count with P-CHS heads and sectors: (745*255*63) / (16*63) = 11873 |
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57 | ; |
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58 | ; The only reason I can think of is that the Award BIOS has a bug and |
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59 | ; uses L-CHS when it should use P-CHS values in the calculation. |
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60 | ; |
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61 | ; |
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62 | ; AH48h_GetExtendedDriveParameters |
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63 | ; Parameters: |
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64 | ; SI: Same as in INTPACK |
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65 | ; DL: Translated Drive number |
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66 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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67 | ; SS:BP: Ptr to IDEPACK |
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68 | ; Parameters on INTPACK: |
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69 | ; DS:SI: Ptr to Extended Drive Information Table to fill |
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70 | ; Returns with INTPACK: |
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71 | ; AH: Int 13h return status |
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72 | ; DS:SI: Ptr to Extended Drive Information Table |
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73 | ; CF: 0 if successful, 1 if error |
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74 | ;-------------------------------------------------------------------- |
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75 | AH48h_HandlerForGetExtendedDriveParameters: |
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76 | mov si, di |
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77 | push ds |
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78 | pop es ; ES = RAMVARS segment |
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79 | xor bx, bx |
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80 | dec bx ; Set to FFFFh to assume we do not return DPTE |
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81 | |
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82 | ; Create DPTE (hardware information for device drivers) |
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83 | %ifdef CREATE_COMPATIBLE_DPT |
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84 | call AH41h_GetSupportBitsToCX |
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85 | test cl, ENHANCED_DISK_DRIVE_SUPPORT |
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86 | jz SHORT .DoNotCreateDPTE |
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87 | call CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI |
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88 | .DoNotCreateDPTE: |
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89 | %endif |
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90 | |
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91 | ; Point DS:DI to Extended Drive Information Table to fill |
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92 | mov di, [bp+IDEPACK.intpack+INTPACK.si] |
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93 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds] |
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94 | |
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95 | ; Check and adjust Extended Drive Information Table size |
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96 | ; to MINIMUM_EDRIVEINFO_SIZE or EDRIVEINFO_SIZE_WITH_DPTE |
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97 | mov ax, MINIMUM_EDRIVEINFO_SIZE |
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98 | mov cx, [di+EDRIVE_INFO.wSize] |
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99 | cmp cx, ax |
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100 | jb Prepare_ReturnFromInt13hWithInvalidFunctionError |
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101 | mov [di+EDRIVE_INFO.wSize], ax |
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102 | add al, EDRIVEINFO_SIZE_WITH_DPTE - MINIMUM_EDRIVEINFO_SIZE |
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103 | cmp cx, ax |
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104 | jb SHORT .SkipEddConfigurationParameters |
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105 | mov [di+EDRIVE_INFO.wSize], ax |
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106 | |
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107 | ; Store DPTE for standard controllers only, |
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108 | ; FFFF:FFFF for non standard controllers |
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109 | %ifdef CREATE_COMPATIBLE_DPT |
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110 | mov [di+EDRIVE_INFO.fpDPTE], bx |
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111 | mov [di+EDRIVE_INFO.fpDPTE+2], es |
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112 | inc bx |
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113 | jnz SHORT .SkipEddConfigurationParameters ; Already stored |
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114 | dec bx |
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115 | mov [di+EDRIVE_INFO.fpDPTE+2], bx ; Segment = FFFFh |
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116 | %else |
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117 | mov [di+EDRIVE_INFO.fpDPTE], bx |
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118 | mov [di+EDRIVE_INFO.fpDPTE+2], bx |
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119 | %endif |
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120 | |
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121 | ; Fill Extended Drive Information Table in DS:DI from DPT in ES:SI |
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122 | .SkipEddConfigurationParameters: |
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123 | mov WORD [di+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS |
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124 | |
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125 | ; Store total sector count |
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126 | call Registers_ExchangeDSSIwithESDI |
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127 | call AccessDPT_GetLbaSectorCountToBXDXAX |
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128 | call Registers_ExchangeDSSIwithESDI |
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129 | mov [di+EDRIVE_INFO.qwTotalSectors], ax |
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130 | mov [di+EDRIVE_INFO.qwTotalSectors+2], dx |
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131 | mov [di+EDRIVE_INFO.qwTotalSectors+4], bx |
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132 | xor cx, cx |
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133 | mov [di+EDRIVE_INFO.qwTotalSectors+6], cx ; Always zero |
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134 | mov WORD [di+EDRIVE_INFO.wSectorSize], 512 |
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135 | |
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136 | ; Store P-CHS. Based on phoenix specification this is returned only if |
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137 | ; total sector count is 15,482,880 or less. |
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138 | sub ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh |
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139 | sbb dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16 |
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140 | sbb bx, cx ; Zero |
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141 | jnc SHORT .ReturnWithSuccess |
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142 | or BYTE [di+EDRIVE_INFO.wFlags], FLG_CHS_INFORMATION_IS_VALID |
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143 | |
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144 | eMOVZX dx, BYTE [es:si+DPT.bPchsHeads] |
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145 | mov [di+EDRIVE_INFO.dwHeads], dx |
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146 | mov [di+EDRIVE_INFO.dwHeads+2], cx |
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147 | |
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148 | mov dl, [es:si+DPT.bPchsSectorsPerTrack] |
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149 | mov [di+EDRIVE_INFO.dwSectorsPerTrack], dx |
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150 | mov [di+EDRIVE_INFO.dwSectorsPerTrack+2], cx |
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151 | |
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152 | mov dx, [es:si+DPT.wPchsCylinders] |
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153 | mov [di+EDRIVE_INFO.dwCylinders], dx |
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154 | mov [di+EDRIVE_INFO.dwCylinders+2], cx |
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155 | |
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156 | .ReturnWithSuccess: |
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157 | xor ax, ax |
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158 | .ReturnWithError: |
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159 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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