[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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[505] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[505] | 12 | ; |
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[376] | 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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[505] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[505] | 18 | ; |
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[376] | 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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[567] | 46 | ; AX, CL |
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[3] | 47 | ;-------------------------------------------------------------------- |
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[33] | 48 | .StealMemoryForRAMVARS: |
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[400] | 49 | %ifndef USE_AT |
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[241] | 50 | mov ax, LITE_MODE_RAMVARS_SEGMENT |
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[3] | 51 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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[97] | 52 | jz SHORT .InitializeRamvars ; No need to steal RAM |
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[364] | 53 | %endif |
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[3] | 54 | |
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[116] | 55 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX |
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[3] | 56 | mov al, [cs:ROMVARS.bStealSize] |
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[33] | 57 | sub [BDA.wBaseMem], ax |
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[567] | 58 | mov ax, [BDA.wBaseMem] |
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| 59 | %ifdef USE_186 |
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| 60 | shl ax, 6 ; Segment to first stolen kB (*=40h) |
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| 61 | %else |
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| 62 | mov cl, 6 |
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| 63 | shl ax, cl |
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| 64 | %endif |
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[150] | 65 | ; Fall to .InitializeRamvars |
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[3] | 66 | |
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[33] | 67 | ;-------------------------------------------------------------------- |
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[97] | 68 | ; .InitializeRamvars |
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[33] | 69 | ; Parameters: |
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[241] | 70 | ; AX: RAMVARS segment |
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[97] | 71 | ; Returns: |
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[33] | 72 | ; DS: RAMVARS segment |
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| 73 | ; Corrupts registers: |
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| 74 | ; AX, CX, DI, ES |
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| 75 | ;-------------------------------------------------------------------- |
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[97] | 76 | .InitializeRamvars: |
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[241] | 77 | mov ds, ax |
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| 78 | mov es, ax |
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[97] | 79 | mov cx, RAMVARS_size |
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| 80 | xor di, di |
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| 81 | call Memory_ZeroESDIwithSizeInCX |
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[444] | 82 | mov WORD [RAMVARS.wDrvDetectSignature], RAMVARS_DRV_DETECT_SIGNATURE |
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| 83 | mov WORD [RAMVARS.wSignature], RAMVARS_RAM_SIGNATURE |
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[556] | 84 | %ifdef MODULE_DRIVEXLATE |
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| 85 | call DriveXlate_Reset |
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| 86 | %endif |
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[505] | 87 | |
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[97] | 88 | pop es |
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[395] | 89 | ret |
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[33] | 90 | |
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[3] | 91 | ;-------------------------------------------------------------------- |
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| 92 | ; Returns segment to RAMVARS. |
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| 93 | ; RAMVARS might be located at the top of interrupt vectors (0030:0000h) |
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| 94 | ; or at the top of system base RAM. |
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| 95 | ; |
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| 96 | ; RamVars_GetSegmentToDS |
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| 97 | ; Parameters: |
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| 98 | ; Nothing |
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| 99 | ; Returns: |
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| 100 | ; DS: RAMVARS segment |
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| 101 | ; Corrupts registers: |
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| 102 | ; DI |
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| 103 | ;-------------------------------------------------------------------- |
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| 104 | ALIGN JUMP_ALIGN |
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| 105 | RamVars_GetSegmentToDS: |
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[368] | 106 | |
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[400] | 107 | %ifndef USE_AT ; Always in Full Mode for AT builds |
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[3] | 108 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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[33] | 109 | jnz SHORT .GetStolenSegmentToDS |
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[400] | 110 | %ifndef USE_186 |
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| 111 | mov di, LITE_MODE_RAMVARS_SEGMENT |
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| 112 | mov ds, di |
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| 113 | %else |
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| 114 | push LITE_MODE_RAMVARS_SEGMENT |
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| 115 | pop ds |
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| 116 | %endif |
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| 117 | ret |
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[181] | 118 | %endif |
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[3] | 119 | |
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| 120 | ALIGN JUMP_ALIGN |
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[33] | 121 | .GetStolenSegmentToDS: |
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[3] | 122 | LOAD_BDA_SEGMENT_TO ds, di |
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| 123 | mov di, [BDA.wBaseMem] ; Load available base memory size in kB |
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[33] | 124 | eSHL_IM di, 6 ; Segment to first stolen kB (*=40h) |
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[3] | 125 | ALIGN JUMP_ALIGN |
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| 126 | .LoopStolenKBs: |
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| 127 | mov ds, di ; EBDA segment to DS |
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| 128 | add di, BYTE 64 ; DI to next stolen kB |
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[444] | 129 | cmp WORD [RAMVARS.wSignature], RAMVARS_RAM_SIGNATURE |
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[3] | 130 | jne SHORT .LoopStolenKBs ; Loop until sign found (always found eventually) |
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| 131 | ret |
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| 132 | |
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| 133 | |
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| 134 | ;-------------------------------------------------------------------- |
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[258] | 135 | ; RamVars_GetHardDiskCountFromBDAtoAX |
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[3] | 136 | ; Parameters: |
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| 137 | ; DS: RAMVARS segment |
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| 138 | ; Returns: |
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[258] | 139 | ; AX: Total hard disk count |
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[3] | 140 | ; Corrupts registers: |
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[492] | 141 | ; BX |
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[116] | 142 | ;-------------------------------------------------------------------- |
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[392] | 143 | %ifdef MODULE_BOOT_MENU |
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[258] | 144 | RamVars_GetHardDiskCountFromBDAtoAX: |
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| 145 | call RamVars_GetCountOfKnownDrivesToAX |
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[294] | 146 | push ds |
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[505] | 147 | LOAD_BDA_SEGMENT_TO ds, bx |
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[492] | 148 | mov bl, [BDA.bHDCount] |
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| 149 | MAX_U al, bl |
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[294] | 150 | pop ds |
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[3] | 151 | ret |
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[392] | 152 | %endif |
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[32] | 153 | |
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[392] | 154 | |
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[32] | 155 | ;-------------------------------------------------------------------- |
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[258] | 156 | ; RamVars_GetCountOfKnownDrivesToAX |
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[32] | 157 | ; Parameters: |
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| 158 | ; DS: RAMVARS segment |
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| 159 | ; Returns: |
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[258] | 160 | ; AX: Total hard disk count |
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[32] | 161 | ; Corrupts registers: |
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[258] | 162 | ; None |
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[116] | 163 | ;-------------------------------------------------------------------- |
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[32] | 164 | ALIGN JUMP_ALIGN |
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[258] | 165 | RamVars_GetCountOfKnownDrivesToAX: |
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[433] | 166 | mov ax, [RAMVARS.wFirstDrvAndCount] |
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[258] | 167 | add al, ah |
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[368] | 168 | and ax, BYTE 7fh |
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[32] | 169 | ret |
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[294] | 170 | |
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[33] | 171 | ;-------------------------------------------------------------------- |
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| 172 | ; RamVars_GetIdeControllerCountToCX |
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| 173 | ; Parameters: |
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| 174 | ; Nothing |
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| 175 | ; Returns: |
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| 176 | ; CX: Number of IDE controllers to handle |
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| 177 | ; Corrupts registers: |
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| 178 | ; Nothing |
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[116] | 179 | ;-------------------------------------------------------------------- |
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[258] | 180 | ALIGN JUMP_ALIGN |
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[33] | 181 | RamVars_GetIdeControllerCountToCX: |
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[294] | 182 | eMOVZX cx, [cs:ROMVARS.bIdeCnt] |
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[33] | 183 | ret |
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[258] | 184 | |
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[473] | 185 | |
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[258] | 186 | %ifdef MODULE_SERIAL_FLOPPY |
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| 187 | ;-------------------------------------------------------------------- |
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| 188 | ; RamVars_UnpackFlopCntAndFirstToAL |
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| 189 | ; Parameters: |
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[473] | 190 | ; DS: RAMVARS segment |
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[258] | 191 | ; Returns: |
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| 192 | ; AL: First floppy drive number supported |
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[567] | 193 | ; CF: Number of floppy drives supported (clear = 1, set = 2) |
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[270] | 194 | ; SF: Emulating drives (clear = yes, set = no) |
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[258] | 195 | ; Corrupts registers: |
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| 196 | ; Nothing |
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[294] | 197 | ;-------------------------------------------------------------------- |
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[258] | 198 | ALIGN JUMP_ALIGN |
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| 199 | RamVars_UnpackFlopCntAndFirstToAL: |
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| 200 | mov al, [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst] |
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[294] | 201 | sar al, 1 |
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[258] | 202 | ret |
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| 203 | %endif |
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