[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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[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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| 58 | mov ax, [BDA.wBaseMem] |
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[97] | 59 | eSHL_IM ax, 6 ; Segment to first stolen kB (*=40h) |
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[150] | 60 | ; Fall to .InitializeRamvars |
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[3] | 61 | |
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[33] | 62 | ;-------------------------------------------------------------------- |
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[97] | 63 | ; .InitializeRamvars |
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[33] | 64 | ; Parameters: |
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[241] | 65 | ; AX: RAMVARS segment |
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[97] | 66 | ; Returns: |
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[33] | 67 | ; DS: RAMVARS segment |
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| 68 | ; Corrupts registers: |
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| 69 | ; AX, CX, DI, ES |
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| 70 | ;-------------------------------------------------------------------- |
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[97] | 71 | .InitializeRamvars: |
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[241] | 72 | mov ds, ax |
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| 73 | mov es, ax |
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[97] | 74 | mov cx, RAMVARS_size |
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| 75 | xor di, di |
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| 76 | call Memory_ZeroESDIwithSizeInCX |
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[444] | 77 | mov WORD [RAMVARS.wDrvDetectSignature], RAMVARS_DRV_DETECT_SIGNATURE |
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| 78 | mov WORD [RAMVARS.wSignature], RAMVARS_RAM_SIGNATURE |
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[417] | 79 | ; Fall to .InitializeInt13hStackChangeVariables |
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| 80 | |
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| 81 | ;-------------------------------------------------------------------- |
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| 82 | ; .InitializeInt13hStackChangeVariables |
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| 83 | ; Parameters: |
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| 84 | ; DS: RAMVARS segment |
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| 85 | ; Returns: |
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| 86 | ; Nothing |
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| 87 | ; Corrupts registers: |
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| 88 | ; AX |
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| 89 | ;-------------------------------------------------------------------- |
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| 90 | %ifdef RELOCATE_INT13H_STACK |
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| 91 | .InitializeInt13hStackChangeVariables: |
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| 92 | eMOVZX ax, BYTE [cs:ROMVARS.bStealSize] |
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| 93 | eSHL_IM ax, 10 ; kiB to Bytes = Top of stack offset |
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| 94 | mov [RAMVARS.wNewStackOffset], ax |
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| 95 | %endif |
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[3] | 96 | |
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[493] | 97 | ;; There used to be a DriveXlate_Reset call here. It isn't necessary, as we reset |
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| 98 | ;; when entering the boot menu and also before transferring control at boot time and |
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| 99 | ;; for ROM boots (in int19h.asm). |
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| 100 | |
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[97] | 101 | pop es |
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[395] | 102 | ret |
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[33] | 103 | |
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[3] | 104 | ;-------------------------------------------------------------------- |
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| 105 | ; Returns segment to RAMVARS. |
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| 106 | ; RAMVARS might be located at the top of interrupt vectors (0030:0000h) |
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| 107 | ; or at the top of system base RAM. |
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| 108 | ; |
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| 109 | ; RamVars_GetSegmentToDS |
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| 110 | ; Parameters: |
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| 111 | ; Nothing |
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| 112 | ; Returns: |
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| 113 | ; DS: RAMVARS segment |
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| 114 | ; Corrupts registers: |
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| 115 | ; DI |
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| 116 | ;-------------------------------------------------------------------- |
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| 117 | ALIGN JUMP_ALIGN |
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| 118 | RamVars_GetSegmentToDS: |
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[368] | 119 | |
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[400] | 120 | %ifndef USE_AT ; Always in Full Mode for AT builds |
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[3] | 121 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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[33] | 122 | jnz SHORT .GetStolenSegmentToDS |
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[400] | 123 | %ifndef USE_186 |
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| 124 | mov di, LITE_MODE_RAMVARS_SEGMENT |
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| 125 | mov ds, di |
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| 126 | %else |
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| 127 | push LITE_MODE_RAMVARS_SEGMENT |
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| 128 | pop ds |
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| 129 | %endif |
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| 130 | ret |
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[181] | 131 | %endif |
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[3] | 132 | |
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| 133 | ALIGN JUMP_ALIGN |
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[33] | 134 | .GetStolenSegmentToDS: |
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[3] | 135 | LOAD_BDA_SEGMENT_TO ds, di |
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| 136 | mov di, [BDA.wBaseMem] ; Load available base memory size in kB |
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[33] | 137 | eSHL_IM di, 6 ; Segment to first stolen kB (*=40h) |
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[3] | 138 | ALIGN JUMP_ALIGN |
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| 139 | .LoopStolenKBs: |
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| 140 | mov ds, di ; EBDA segment to DS |
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| 141 | add di, BYTE 64 ; DI to next stolen kB |
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[444] | 142 | cmp WORD [RAMVARS.wSignature], RAMVARS_RAM_SIGNATURE |
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[3] | 143 | jne SHORT .LoopStolenKBs ; Loop until sign found (always found eventually) |
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| 144 | ret |
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| 145 | |
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| 146 | |
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| 147 | ;-------------------------------------------------------------------- |
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[258] | 148 | ; RamVars_GetHardDiskCountFromBDAtoAX |
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[3] | 149 | ; Parameters: |
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| 150 | ; DS: RAMVARS segment |
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| 151 | ; Returns: |
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[258] | 152 | ; AX: Total hard disk count |
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[3] | 153 | ; Corrupts registers: |
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[492] | 154 | ; BX |
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[116] | 155 | ;-------------------------------------------------------------------- |
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[392] | 156 | %ifdef MODULE_BOOT_MENU |
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[258] | 157 | RamVars_GetHardDiskCountFromBDAtoAX: |
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| 158 | call RamVars_GetCountOfKnownDrivesToAX |
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[294] | 159 | push ds |
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| 160 | LOAD_BDA_SEGMENT_TO ds, cx |
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[492] | 161 | mov bl, [BDA.bHDCount] |
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| 162 | MAX_U al, bl |
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[294] | 163 | pop ds |
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[3] | 164 | ret |
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[392] | 165 | %endif |
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[32] | 166 | |
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[392] | 167 | |
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[32] | 168 | ;-------------------------------------------------------------------- |
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[258] | 169 | ; RamVars_GetCountOfKnownDrivesToAX |
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[32] | 170 | ; Parameters: |
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| 171 | ; DS: RAMVARS segment |
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| 172 | ; Returns: |
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[258] | 173 | ; AX: Total hard disk count |
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[32] | 174 | ; Corrupts registers: |
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[258] | 175 | ; None |
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[116] | 176 | ;-------------------------------------------------------------------- |
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[32] | 177 | ALIGN JUMP_ALIGN |
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[258] | 178 | RamVars_GetCountOfKnownDrivesToAX: |
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[433] | 179 | mov ax, [RAMVARS.wFirstDrvAndCount] |
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[258] | 180 | add al, ah |
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[368] | 181 | and ax, BYTE 7fh |
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[32] | 182 | ret |
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[294] | 183 | |
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[33] | 184 | ;-------------------------------------------------------------------- |
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| 185 | ; RamVars_GetIdeControllerCountToCX |
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| 186 | ; Parameters: |
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| 187 | ; Nothing |
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| 188 | ; Returns: |
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| 189 | ; CX: Number of IDE controllers to handle |
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| 190 | ; Corrupts registers: |
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| 191 | ; Nothing |
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[116] | 192 | ;-------------------------------------------------------------------- |
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[258] | 193 | ALIGN JUMP_ALIGN |
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[33] | 194 | RamVars_GetIdeControllerCountToCX: |
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[294] | 195 | eMOVZX cx, [cs:ROMVARS.bIdeCnt] |
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[33] | 196 | ret |
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[258] | 197 | |
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[473] | 198 | |
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[258] | 199 | %ifdef MODULE_SERIAL_FLOPPY |
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| 200 | ;-------------------------------------------------------------------- |
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| 201 | ; RamVars_UnpackFlopCntAndFirstToAL |
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| 202 | ; Parameters: |
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[473] | 203 | ; DS: RAMVARS segment |
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[258] | 204 | ; Returns: |
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| 205 | ; AL: First floppy drive number supported |
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| 206 | ; CF: Number of floppy drives supported (clear = 1, set = 2) |
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[270] | 207 | ; SF: Emulating drives (clear = yes, set = no) |
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[258] | 208 | ; Corrupts registers: |
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| 209 | ; Nothing |
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[294] | 210 | ;-------------------------------------------------------------------- |
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[258] | 211 | ALIGN JUMP_ALIGN |
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| 212 | RamVars_UnpackFlopCntAndFirstToAL: |
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| 213 | mov al, [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst] |
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[294] | 214 | sar al, 1 |
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[258] | 215 | ret |
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| 216 | %endif |
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[473] | 217 | |
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| 218 | |
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[489] | 219 | %if 0 ; unused... |
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[473] | 220 | ;-------------------------------------------------------------------- |
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| 221 | ; RamVars_IsDriveDetectionInProgress |
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| 222 | ; Parameters: |
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| 223 | ; DS: RAMVARS segment |
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| 224 | ; Returns: |
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| 225 | ; ZF: Set if drive detection is in progress (ROM initialization) |
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| 226 | ; Corrupts registers: |
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| 227 | ; None |
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| 228 | ;-------------------------------------------------------------------- |
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| 229 | RamVars_IsDriveDetectionInProgress: |
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| 230 | cmp WORD [RAMVARS.wSignature], RAMVARS_DRV_DETECT_SIGNATURE |
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| 231 | ret |
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[489] | 232 | %endif |
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