[497] | 1 | ; Project name : XTIDE Universal BIOS Configurator v2 |
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| 2 | ; Description : Functions to detect ports and devices. |
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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, 2011-2012 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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| 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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[502] | 24 | ; IdeAutodetect_DetectIdeDeviceFromPortDXAndReturnControlBlockInCX |
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[497] | 25 | ; Parameters: |
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| 26 | ; DX: IDE Base Port |
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| 27 | ; DS:DI: Ptr to ROMVARS |
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| 28 | ; Returns: |
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| 29 | ; AL: Device Type |
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[502] | 30 | ; CX: Control Block Base port (detected since there is no |
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| 31 | ; standard address for Tetriary and Quaternary IDE controllers) |
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[497] | 32 | ; CF: Clear if IDE Device found |
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| 33 | ; Set if IDE Device not found |
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| 34 | ; Corrupts registers: |
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[502] | 35 | ; AH, BX |
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[497] | 36 | ;-------------------------------------------------------------------- |
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[502] | 37 | IdeAutodetect_DetectIdeDeviceFromPortDXAndReturnControlBlockInCX: |
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[497] | 38 | cmp dx, FIRST_MEMORY_SEGMENT_ADDRESS |
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| 39 | jb SHORT .DetectPortMappedDevices |
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| 40 | |
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[502] | 41 | ; *** Try to detect JR-IDE/ISA (only if MODULE_8BIT_IDE_ADVANCED is present) *** |
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[497] | 42 | test WORD [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE_ADVANCED |
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| 43 | jz SHORT .SkipRestOfDetection |
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| 44 | |
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| 45 | push ds |
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| 46 | mov ds, dx |
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[502] | 47 | cli ; Disable Interrupts |
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[497] | 48 | mov ah, [JRIDE_COMMAND_BLOCK_REGISTER_WINDOW_OFFSET + STATUS_REGISTER_in] |
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| 49 | mov al, [JRIDE_CONTROL_BLOCK_REGISTER_WINDOW_OFFSET + ALTERNATE_STATUS_REGISTER_in] |
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[502] | 50 | sti ; Enable Interrupts |
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[497] | 51 | pop ds |
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| 52 | call CompareIdeStatusRegistersFromALandAH |
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[502] | 53 | mov al, DEVICE_8BIT_JRIDE_ISA ; Assume CF was cleared |
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| 54 | ret ; No need to return Control Block Port |
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[497] | 55 | .DetectPortMappedDevices: |
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| 56 | |
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| 57 | |
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[502] | 58 | ; *** Try to detect Standard 16- and 32-bit IDE Devices *** |
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[497] | 59 | mov bh, DEVICE_16BIT_ATA ; Assume 16-bit ISA slot for AT builds |
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| 60 | call Buffers_IsXTbuildLoaded |
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| 61 | eCMOVE bh, DEVICE_8BIT_ATA ; Assume 8-bit ISA slot for XT builds |
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[502] | 62 | |
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[497] | 63 | mov bl, STATUS_REGISTER_in |
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| 64 | mov cx, STANDARD_CONTROL_BLOCK_OFFSET + ALTERNATE_STATUS_REGISTER_in |
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[502] | 65 | .RedetectTertiaryOrQuaternaryWithDifferentAlternativeStatusRegisterPort: |
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[497] | 66 | call DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX |
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| 67 | mov al, bh |
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| 68 | jnc SHORT .IdeDeviceFound |
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| 69 | |
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[502] | 70 | ; 16- or 32-bit IDE Device was not found but we may have used wrong Control Block port if we were trying |
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| 71 | ; to detect Tertiary or Quaternary IDE controllers. Control Block port location is not standardized. For |
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| 72 | ; example Promise FloppyMAX has Control Block at STANDARD_CONTROL_BLOCK_OFFSET but Sound Blaster 16 (CT2290) |
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| 73 | ; use DEVICE_ATA_SECONDARY_PORTCTRL for Tertiary and Quaternary even though only Secondary should use that. |
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| 74 | cmp cx, STANDARD_CONTROL_BLOCK_OFFSET + ALTERNATE_STATUS_REGISTER_in |
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| 75 | jne SHORT .AlreadyTriedAlternativeControlBlock |
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| 76 | mov cx, DEVICE_ATA_SECONDARY_PORTCTRL + ALTERNATE_STATUS_REGISTER_in |
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| 77 | sub cx, dx ; Offset to add to DX |
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| 78 | cmp dx, DEVICE_ATA_TERTIARY_PORT |
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| 79 | je SHORT .RedetectTertiaryOrQuaternaryWithDifferentAlternativeStatusRegisterPort |
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| 80 | cmp dx, DEVICE_ATA_QUATERNARY_PORT |
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| 81 | je SHORT .RedetectTertiaryOrQuaternaryWithDifferentAlternativeStatusRegisterPort |
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| 82 | .AlreadyTriedAlternativeControlBlock: |
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[497] | 83 | |
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[502] | 84 | |
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[497] | 85 | ; Detect 8-bit devices only if MODULE_8BIT_IDE is available |
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| 86 | test BYTE [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE |
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| 87 | jz SHORT .SkipRestOfDetection |
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| 88 | |
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[502] | 89 | ; *** Try to detect XT-CF *** |
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[497] | 90 | mov bl, STATUS_REGISTER_in << 1 |
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| 91 | mov cx, (XTIDE_CONTROL_BLOCK_OFFSET + ALTERNATE_STATUS_REGISTER_in) << 1 |
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| 92 | call DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX |
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[502] | 93 | rcl ax, 1 ; Store CF |
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| 94 | shr cx, 1 ; XTIDE_CONTROL_BLOCK_OFFSET + ALTERNATE_STATUS_REGISTER_in |
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| 95 | rcr ax, 1 ; Restore CF |
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[497] | 96 | mov al, DEVICE_8BIT_XTCF_PIO8 |
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| 97 | jnc SHORT .IdeDeviceFound |
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| 98 | |
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[502] | 99 | |
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| 100 | ; *** Try to detect 8-bit XT-IDE rev 1 or rev 2 *** |
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[498] | 101 | ; Note that A0<->A3 address swaps Status Register and Alternative |
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| 102 | ; Status Register addresses. That is why we need another step |
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| 103 | ; to check is this XT-IDE rev 1 or rev 2. |
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[497] | 104 | call DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX |
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[498] | 105 | jc SHORT .SkipRestOfDetection ; No XT-IDE rev 1 or rev 2 found |
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[497] | 106 | |
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[498] | 107 | ; Now we can be sure that we have XT-IDE rev 1 or rev 2. |
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| 108 | ; Rev 2 swaps address lines A0 and A3 thus LBA Low Register |
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| 109 | ; moves from offset 3h to offset Ah. There is no Register at |
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| 110 | ; offset Ah so if we can write to it and read back, then we |
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| 111 | ; must have XT-IDE rev 2 or modded rev 1. |
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| 112 | push dx |
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| 113 | add dx, BYTE 0Ah ; LBA Low Register for XT-IDE rev 2 |
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| 114 | mov al, DEVICE_8BIT_XTIDE_REV2 ; Our test byte |
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| 115 | out dx, al ; Output our test byte |
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| 116 | JMP_DELAY |
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| 117 | in al, dx ; Read back |
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| 118 | pop dx |
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| 119 | cmp al, DEVICE_8BIT_XTIDE_REV2 |
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| 120 | je SHORT .IdeDeviceFound |
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| 121 | mov al, DEVICE_8BIT_XTIDE_REV1 ; We must have rev 1 |
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[497] | 122 | .IdeDeviceFound: |
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[502] | 123 | sub cl, ALTERNATE_STATUS_REGISTER_in ; Clear CF |
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| 124 | add cx, dx ; CX = Control Block address |
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[497] | 125 | ret |
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| 126 | .SkipRestOfDetection: |
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| 127 | stc |
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| 128 | ret |
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| 129 | |
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| 130 | |
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| 131 | ;-------------------------------------------------------------------- |
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| 132 | ; DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX |
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| 133 | ; Parameters: |
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| 134 | ; BL: Offset to IDE Status Register |
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| 135 | ; CX: Offset to Alternative Status Register |
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| 136 | ; DX: IDE Base Port |
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| 137 | ; Returns: |
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| 138 | ; CF: Clear if IDE Device found |
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| 139 | ; Set if IDE Device not found |
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| 140 | ; Corrupts registers: |
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| 141 | ; AX |
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| 142 | ;-------------------------------------------------------------------- |
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| 143 | DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX: |
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| 144 | ; Read Status and Alternative Status Registers |
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| 145 | push cx |
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| 146 | push dx |
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| 147 | |
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| 148 | add cx, dx ; CX = Address to Alternative Status Register |
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| 149 | add dl, bl ; DX = Address to Status Register |
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| 150 | cli ; Disable Interrupts |
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| 151 | in al, dx ; Read Status Register |
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| 152 | mov ah, al |
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| 153 | mov dx, cx |
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| 154 | in al, dx ; Read Alternative Status Register |
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| 155 | sti ; Enable Interrupts |
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| 156 | |
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| 157 | pop dx |
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| 158 | pop cx |
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| 159 | ; Fall to CompareIdeStatusRegistersFromALandAH |
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| 160 | |
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| 161 | |
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| 162 | ;-------------------------------------------------------------------- |
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| 163 | ; CompareIdeStatusRegistersFromALandAH |
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| 164 | ; Parameters: |
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| 165 | ; AL: Possible IDE Status Register contents |
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| 166 | ; AH: Possible IDE Alternative Status Register contents |
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| 167 | ; Returns: |
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| 168 | ; CF: Clear if valid Status Register Contents |
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| 169 | ; Set if not possible IDE Status Registers |
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| 170 | ; Corrupts registers: |
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| 171 | ; Nothing |
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| 172 | ;-------------------------------------------------------------------- |
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| 173 | CompareIdeStatusRegistersFromALandAH: |
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| 174 | ; Status Register now in AH and Alternative Status Register in AL. |
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| 175 | ; They must be the same if base port was in use by IDE device. |
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| 176 | cmp al, ah |
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| 177 | jne SHORT .InvalidStatusRegister |
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| 178 | |
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| 179 | ; Bytes were the same but it is possible they were both FFh, for |
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[502] | 180 | ; example. We must make sure bits are what is expected from valid |
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| 181 | ; IDE Status Register. So far all drives I've tested return 50h |
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| 182 | ; (FLG_STATUS_DRDY and FLG_STATUS_DSC set) but I don't want to assume |
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| 183 | ; just yet that all drives report 50h. |
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[497] | 184 | test al, FLG_STATUS_BSY | FLG_STATUS_DF | FLG_STATUS_DRQ | FLG_STATUS_ERR |
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| 185 | jnz SHORT .InvalidStatusRegister ; Busy or Errors cannot be set |
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| 186 | test al, FLG_STATUS_DRDY |
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| 187 | jz SHORT .InvalidStatusRegister ; Device needs to be ready |
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| 188 | ret ; Return with CF cleared |
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| 189 | |
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| 190 | .InvalidStatusRegister: |
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| 191 | AllPortsAlreadyDetected: |
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| 192 | stc |
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| 193 | ret |
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| 194 | |
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| 195 | |
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| 196 | ;-------------------------------------------------------------------- |
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| 197 | ; IdeAutodetect_IncrementDXtoNextIdeBasePort |
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| 198 | ; Parameters: |
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| 199 | ; DX: Previous IDE Base Port |
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| 200 | ; Returns: |
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| 201 | ; DX: Next IDE Base Port |
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| 202 | ; ZF: Set if no more Base Ports (DX was last base port on entry) |
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| 203 | ; Clear if new base port returned in DX |
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| 204 | ; Corrupts registers: |
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| 205 | ; AX |
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| 206 | ;-------------------------------------------------------------------- |
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| 207 | ALIGN JUMP_ALIGN |
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| 208 | IdeAutodetect_IncrementDXtoNextIdeBasePort: |
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| 209 | cmp dx, [cs:.wLastIdePort] |
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| 210 | je SHORT .AllPortsAlreadyDetected |
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| 211 | |
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| 212 | push si |
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| 213 | mov si, .rgwIdeBasePorts |
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| 214 | .CompareNextIdeBasePort: |
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| 215 | cmp [cs:si], dx |
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| 216 | lea si, [si+2] ; Increment SI and preserve FLAGS |
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| 217 | jne SHORT .CompareNextIdeBasePort |
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| 218 | |
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| 219 | mov dx, [cs:si] ; Get next port |
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| 220 | test dx, dx ; Clear ZF |
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| 221 | pop si |
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| 222 | .AllPortsAlreadyDetected: |
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| 223 | ret |
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| 224 | |
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| 225 | |
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| 226 | ; All ports used in autodetection. Ports can be in any order. |
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| 227 | ALIGN WORD_ALIGN |
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| 228 | .rgwIdeBasePorts: |
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| 229 | dw IDE_PORT_TO_START_DETECTION ; Must be first |
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[498] | 230 | ; Standard IDE |
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| 231 | dw DEVICE_ATA_PRIMARY_PORT |
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| 232 | dw DEVICE_ATA_SECONDARY_PORT |
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| 233 | dw DEVICE_ATA_TERTIARY_PORT |
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| 234 | dw DEVICE_ATA_QUATERNARY_PORT |
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[497] | 235 | ; 8-bit Devices |
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| 236 | dw 200h |
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| 237 | dw 220h |
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| 238 | dw 240h |
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| 239 | dw 260h |
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| 240 | dw 280h |
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| 241 | dw 2A0h |
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| 242 | dw 2C0h |
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| 243 | dw 2E0h |
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| 244 | dw 300h |
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| 245 | dw 320h |
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| 246 | dw 340h |
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| 247 | dw 360h |
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| 248 | dw 380h |
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| 249 | dw 3A0h |
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| 250 | dw 3C0h |
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| 251 | dw 3E0h |
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[498] | 252 | ; JR-IDE/ISA (Memory Segment Addresses) |
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| 253 | dw 0C000h |
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| 254 | dw 0C400h |
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| 255 | dw 0C800h |
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| 256 | dw 0CC00h |
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| 257 | dw 0D000h |
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| 258 | dw 0D400h |
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| 259 | dw 0D800h |
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[497] | 260 | .wLastIdePort: |
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[498] | 261 | dw 0DC00h |
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