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