[90] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Functions for accessings RAMVARS. |
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| 3 | |
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[376] | 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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[3] | 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 | ; Initializes RAMVARS. |
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| 25 | ; Drive detection can be started after this function returns. |
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| 26 | ; |
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| 27 | ; RamVars_Initialize |
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| 28 | ; Parameters: |
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| 29 | ; Nothing |
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| 30 | ; Returns: |
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[97] | 31 | ; DS: RAMVARS segment |
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[3] | 32 | ; Corrupts registers: |
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[97] | 33 | ; AX, CX, DI |
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[3] | 34 | ;-------------------------------------------------------------------- |
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| 35 | RamVars_Initialize: |
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[90] | 36 | push es |
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[97] | 37 | ; Fall to .StealMemoryForRAMVARS |
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[3] | 38 | |
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| 39 | ;-------------------------------------------------------------------- |
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[33] | 40 | ; .StealMemoryForRAMVARS |
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[3] | 41 | ; Parameters: |
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| 42 | ; Nothing |
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| 43 | ; Returns: |
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| 44 | ; DS: RAMVARS segment |
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| 45 | ; Corrupts registers: |
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| 46 | ; AX |
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| 47 | ;-------------------------------------------------------------------- |
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[33] | 48 | .StealMemoryForRAMVARS: |
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[364] | 49 | ; Always steal memory when using Advanced ATA module since it |
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| 50 | ; uses larger DPTs |
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| 51 | %ifndef MODULE_ADVANCED_ATA |
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[241] | 52 | mov ax, LITE_MODE_RAMVARS_SEGMENT |
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[3] | 53 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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[97] | 54 | jz SHORT .InitializeRamvars ; No need to steal RAM |
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[364] | 55 | %endif |
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[3] | 56 | |
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[116] | 57 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX |
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[3] | 58 | mov al, [cs:ROMVARS.bStealSize] |
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[33] | 59 | sub [BDA.wBaseMem], ax |
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| 60 | mov ax, [BDA.wBaseMem] |
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[97] | 61 | eSHL_IM ax, 6 ; Segment to first stolen kB (*=40h) |
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[150] | 62 | ; Fall to .InitializeRamvars |
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[3] | 63 | |
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[33] | 64 | ;-------------------------------------------------------------------- |
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[97] | 65 | ; .InitializeRamvars |
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[33] | 66 | ; Parameters: |
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[241] | 67 | ; AX: RAMVARS segment |
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[97] | 68 | ; Returns: |
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[33] | 69 | ; DS: RAMVARS segment |
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| 70 | ; Corrupts registers: |
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| 71 | ; AX, CX, DI, ES |
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| 72 | ;-------------------------------------------------------------------- |
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[97] | 73 | .InitializeRamvars: |
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[241] | 74 | mov ds, ax |
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| 75 | mov es, ax |
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[97] | 76 | mov cx, RAMVARS_size |
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| 77 | xor di, di |
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| 78 | call Memory_ZeroESDIwithSizeInCX |
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[150] | 79 | mov WORD [RAMVARS.wSignature], RAMVARS_SIGNATURE |
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[97] | 80 | ; Fall to .InitializeDriveTranslationAndReturn |
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[3] | 81 | |
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[97] | 82 | ;-------------------------------------------------------------------- |
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| 83 | ; .InitializeDriveTranslationAndReturn |
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| 84 | ; Parameters: |
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| 85 | ; DS: RAMVARS segment |
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| 86 | ; Returns: |
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| 87 | ; Nothing |
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| 88 | ; Corrupts registers: |
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| 89 | ; AX |
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| 90 | ;-------------------------------------------------------------------- |
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| 91 | .InitializeDriveTranslationAndReturn: |
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| 92 | pop es |
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| 93 | jmp DriveXlate_Reset |
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[33] | 94 | |
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[97] | 95 | |
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[3] | 96 | ;-------------------------------------------------------------------- |
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| 97 | ; Returns segment to RAMVARS. |
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| 98 | ; RAMVARS might be located at the top of interrupt vectors (0030:0000h) |
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| 99 | ; or at the top of system base RAM. |
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| 100 | ; |
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| 101 | ; RamVars_GetSegmentToDS |
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| 102 | ; Parameters: |
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| 103 | ; Nothing |
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| 104 | ; Returns: |
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| 105 | ; DS: RAMVARS segment |
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| 106 | ; Corrupts registers: |
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| 107 | ; DI |
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| 108 | ;-------------------------------------------------------------------- |
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| 109 | ALIGN JUMP_ALIGN |
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| 110 | RamVars_GetSegmentToDS: |
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[368] | 111 | |
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| 112 | %ifndef MODULE_ADVANCED_ATA ; Always in Full Mode when using Advanced ATA Module |
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[3] | 113 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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[33] | 114 | jnz SHORT .GetStolenSegmentToDS |
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[181] | 115 | %ifndef USE_186 |
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[150] | 116 | mov di, LITE_MODE_RAMVARS_SEGMENT |
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[3] | 117 | mov ds, di |
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[181] | 118 | %else |
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| 119 | push LITE_MODE_RAMVARS_SEGMENT |
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| 120 | pop ds |
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| 121 | %endif |
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[3] | 122 | ret |
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[368] | 123 | %endif ; MODULE_ADVANCED_ATA |
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[3] | 124 | |
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| 125 | ALIGN JUMP_ALIGN |
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[33] | 126 | .GetStolenSegmentToDS: |
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[3] | 127 | LOAD_BDA_SEGMENT_TO ds, di |
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| 128 | mov di, [BDA.wBaseMem] ; Load available base memory size in kB |
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[33] | 129 | eSHL_IM di, 6 ; Segment to first stolen kB (*=40h) |
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[3] | 130 | ALIGN JUMP_ALIGN |
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| 131 | .LoopStolenKBs: |
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| 132 | mov ds, di ; EBDA segment to DS |
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| 133 | add di, BYTE 64 ; DI to next stolen kB |
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[150] | 134 | cmp WORD [RAMVARS.wSignature], RAMVARS_SIGNATURE |
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[3] | 135 | jne SHORT .LoopStolenKBs ; Loop until sign found (always found eventually) |
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| 136 | ret |
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| 137 | |
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| 138 | |
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| 139 | ;-------------------------------------------------------------------- |
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[258] | 140 | ; RamVars_GetHardDiskCountFromBDAtoAX |
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[3] | 141 | ; Parameters: |
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| 142 | ; DS: RAMVARS segment |
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| 143 | ; Returns: |
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[258] | 144 | ; AX: Total hard disk count |
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[3] | 145 | ; Corrupts registers: |
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[258] | 146 | ; CX |
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[116] | 147 | ;-------------------------------------------------------------------- |
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[3] | 148 | ALIGN JUMP_ALIGN |
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[258] | 149 | RamVars_GetHardDiskCountFromBDAtoAX: |
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| 150 | call RamVars_GetCountOfKnownDrivesToAX |
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[294] | 151 | push ds |
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| 152 | LOAD_BDA_SEGMENT_TO ds, cx |
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| 153 | mov cl, [BDA.bHDCount] |
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[258] | 154 | MAX_U al, cl |
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[294] | 155 | pop ds |
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[3] | 156 | ret |
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[32] | 157 | |
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| 158 | ;-------------------------------------------------------------------- |
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[258] | 159 | ; RamVars_GetCountOfKnownDrivesToAX |
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[32] | 160 | ; Parameters: |
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| 161 | ; DS: RAMVARS segment |
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| 162 | ; Returns: |
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[258] | 163 | ; AX: Total hard disk count |
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[32] | 164 | ; Corrupts registers: |
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[258] | 165 | ; None |
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[116] | 166 | ;-------------------------------------------------------------------- |
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[32] | 167 | ALIGN JUMP_ALIGN |
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[258] | 168 | RamVars_GetCountOfKnownDrivesToAX: |
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| 169 | mov ax, [RAMVARS.wDrvCntAndFirst] |
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| 170 | add al, ah |
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[368] | 171 | and ax, BYTE 7fh |
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[32] | 172 | ret |
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[294] | 173 | |
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[33] | 174 | ;-------------------------------------------------------------------- |
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| 175 | ; RamVars_GetIdeControllerCountToCX |
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| 176 | ; Parameters: |
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| 177 | ; Nothing |
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| 178 | ; Returns: |
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| 179 | ; CX: Number of IDE controllers to handle |
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| 180 | ; Corrupts registers: |
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| 181 | ; Nothing |
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[116] | 182 | ;-------------------------------------------------------------------- |
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[258] | 183 | ALIGN JUMP_ALIGN |
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[33] | 184 | RamVars_GetIdeControllerCountToCX: |
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[294] | 185 | eMOVZX cx, [cs:ROMVARS.bIdeCnt] |
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[33] | 186 | ret |
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[258] | 187 | |
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| 188 | %ifdef MODULE_SERIAL_FLOPPY |
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| 189 | ;-------------------------------------------------------------------- |
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| 190 | ; RamVars_UnpackFlopCntAndFirstToAL |
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| 191 | ; Parameters: |
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| 192 | ; Nothing |
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| 193 | ; Returns: |
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| 194 | ; AL: First floppy drive number supported |
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| 195 | ; CF: Number of floppy drives supported (clear = 1, set = 2) |
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[270] | 196 | ; SF: Emulating drives (clear = yes, set = no) |
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[258] | 197 | ; Corrupts registers: |
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| 198 | ; Nothing |
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[294] | 199 | ;-------------------------------------------------------------------- |
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[258] | 200 | ALIGN JUMP_ALIGN |
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| 201 | RamVars_UnpackFlopCntAndFirstToAL: |
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| 202 | mov al, [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst] |
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[294] | 203 | sar al, 1 |
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[258] | 204 | ret |
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| 205 | %endif |
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