[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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[518] | 23 | IDE_PORT_TO_START_DETECTION EQU 00h ; Must be zero (not actual port) |
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| 24 | FIRST_MEMORY_SEGMENT_ADDRESS EQU 0C000h |
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| 25 | |
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[497] | 26 | ;-------------------------------------------------------------------- |
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[505] | 27 | ; IdeAutodetect_DetectIdeDeviceFromPortDXAndReturnControlBlockInSI |
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[497] | 28 | ; Parameters: |
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[504] | 29 | ; DX: IDE Base Port or segment address (Command Block) |
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[497] | 30 | ; DS:DI: Ptr to ROMVARS |
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| 31 | ; Returns: |
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| 32 | ; AL: Device Type |
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[504] | 33 | ; SI: IDE Control Block Base port (port mapped devices only) |
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[497] | 34 | ; CF: Clear if IDE Device found |
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| 35 | ; Set if IDE Device not found |
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| 36 | ; Corrupts registers: |
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[502] | 37 | ; AH, BX |
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[497] | 38 | ;-------------------------------------------------------------------- |
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[504] | 39 | IdeAutodetect_DetectIdeDeviceFromPortDXAndReturnControlBlockInSI: |
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[497] | 40 | cmp dx, FIRST_MEMORY_SEGMENT_ADDRESS |
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[504] | 41 | jb SHORT DetectPortMappedDeviceFromPortDX |
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| 42 | ; Fall to DetectMemoryMappedDeviceFromSegmentDX |
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[497] | 43 | |
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[504] | 44 | ;-------------------------------------------------------------------- |
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| 45 | ; DetectMemoryMappedDeviceFromSegmentDX |
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| 46 | ; Parameters: |
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| 47 | ; DX: Segment address for Memory Mapped Device |
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| 48 | ; DS:DI: Ptr to ROMVARS |
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| 49 | ; Returns: |
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| 50 | ; AL: Device Type |
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| 51 | ; CF: Clear if IDE Device found |
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| 52 | ; Set if IDE Device not found |
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| 53 | ; Corrupts registers: |
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| 54 | ; AH, BX |
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| 55 | ;-------------------------------------------------------------------- |
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| 56 | DetectMemoryMappedDeviceFromSegmentDX: |
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[502] | 57 | ; *** Try to detect JR-IDE/ISA (only if MODULE_8BIT_IDE_ADVANCED is present) *** |
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[497] | 58 | test WORD [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE_ADVANCED |
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[504] | 59 | jz SHORT NoIdeDeviceFound |
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[497] | 60 | |
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| 61 | push ds |
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| 62 | mov ds, dx |
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[502] | 63 | cli ; Disable Interrupts |
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[497] | 64 | mov ah, [JRIDE_COMMAND_BLOCK_REGISTER_WINDOW_OFFSET + STATUS_REGISTER_in] |
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| 65 | mov al, [JRIDE_CONTROL_BLOCK_REGISTER_WINDOW_OFFSET + ALTERNATE_STATUS_REGISTER_in] |
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[502] | 66 | sti ; Enable Interrupts |
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[497] | 67 | pop ds |
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| 68 | call CompareIdeStatusRegistersFromALandAH |
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[502] | 69 | mov al, DEVICE_8BIT_JRIDE_ISA ; Assume CF was cleared |
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[518] | 70 | mov si, dx ; For IDEDTCT.COM |
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[502] | 71 | ret ; No need to return Control Block Port |
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[497] | 72 | |
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| 73 | |
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[504] | 74 | ;-------------------------------------------------------------------- |
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| 75 | ; DetectPortMappedDeviceFromPortDX |
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| 76 | ; Parameters: |
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| 77 | ; DX: IDE Base Port (Command Block) |
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| 78 | ; DS:DI: Ptr to ROMVARS |
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| 79 | ; Returns: |
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| 80 | ; AL: Device Type |
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| 81 | ; SI: IDE Control Block Base port |
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| 82 | ; CF: Clear if IDE Device found |
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| 83 | ; Set if IDE Device not found |
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| 84 | ; Corrupts registers: |
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| 85 | ; AH, BX |
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| 86 | ;-------------------------------------------------------------------- |
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| 87 | DetectPortMappedDeviceFromPortDX: |
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[502] | 88 | ; *** Try to detect Standard 16- and 32-bit IDE Devices *** |
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[504] | 89 | mov al, DEVICE_16BIT_ATA ; Assume 16-bit ISA slot for AT builds |
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[497] | 90 | call Buffers_IsXTbuildLoaded |
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[504] | 91 | eCMOVE al, DEVICE_8BIT_ATA ; Assume 8-bit ISA slot for XT builds |
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[502] | 92 | |
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[504] | 93 | ; Start with standard Control Block base port used by Primary and Secondary IDE |
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| 94 | mov si, dx |
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| 95 | add si, STANDARD_CONTROL_BLOCK_OFFSET |
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| 96 | mov bx, STATUS_REGISTER_in | (ALTERNATE_STATUS_REGISTER_in << 8) |
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| 97 | .RedetectTertiaryOrQuaternaryWithDifferentControlBlockAddress: |
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| 98 | push ax ; Store device type |
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| 99 | call DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH |
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| 100 | pop ax ; Restore device type |
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[497] | 101 | jnc SHORT .IdeDeviceFound |
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| 102 | |
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[502] | 103 | ; 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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| 104 | ; to detect Tertiary or Quaternary IDE controllers. Control Block port location is not standardized. For |
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| 105 | ; example Promise FloppyMAX has Control Block at STANDARD_CONTROL_BLOCK_OFFSET but Sound Blaster 16 (CT2290) |
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| 106 | ; use DEVICE_ATA_SECONDARY_PORTCTRL for Tertiary and Quaternary even though only Secondary should use that. |
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[504] | 107 | call ChangeDifferentControlBlockAddressToSI |
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| 108 | je SHORT .RedetectTertiaryOrQuaternaryWithDifferentControlBlockAddress |
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[497] | 109 | |
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[502] | 110 | |
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[497] | 111 | ; Detect 8-bit devices only if MODULE_8BIT_IDE is available |
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| 112 | test BYTE [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE |
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[504] | 113 | jz SHORT NoIdeDeviceFound |
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[497] | 114 | |
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[502] | 115 | ; *** Try to detect XT-CF *** |
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[504] | 116 | mov si, dx |
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| 117 | add si, BYTE XTCF_CONTROL_BLOCK_OFFSET |
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| 118 | shl bx, 1 ; SHL 1 register offsets for XT-CF |
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| 119 | call DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH |
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[497] | 120 | mov al, DEVICE_8BIT_XTCF_PIO8 |
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| 121 | jnc SHORT .IdeDeviceFound |
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| 122 | |
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[502] | 123 | |
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| 124 | ; *** Try to detect 8-bit XT-IDE rev 1 or rev 2 *** |
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[498] | 125 | ; Note that A0<->A3 address swaps Status Register and Alternative |
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| 126 | ; Status Register addresses. That is why we need another step |
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| 127 | ; to check is this XT-IDE rev 1 or rev 2. |
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[504] | 128 | sub si, BYTE XTCF_CONTROL_BLOCK_OFFSET >> 1 |
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| 129 | shr bx, 1 |
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| 130 | call DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH |
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| 131 | jc SHORT NoIdeDeviceFound ; No XT-IDE rev 1 or rev 2 found |
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[497] | 132 | |
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[498] | 133 | ; Now we can be sure that we have XT-IDE rev 1 or rev 2. |
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| 134 | ; Rev 2 swaps address lines A0 and A3 thus LBA Low Register |
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| 135 | ; moves from offset 3h to offset Ah. There is no Register at |
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| 136 | ; offset Ah so if we can write to it and read back, then we |
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| 137 | ; must have XT-IDE rev 2 or modded rev 1. |
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| 138 | push dx |
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| 139 | add dx, BYTE 0Ah ; LBA Low Register for XT-IDE rev 2 |
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| 140 | mov al, DEVICE_8BIT_XTIDE_REV2 ; Our test byte |
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| 141 | out dx, al ; Output our test byte |
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| 142 | JMP_DELAY |
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| 143 | in al, dx ; Read back |
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| 144 | pop dx |
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| 145 | cmp al, DEVICE_8BIT_XTIDE_REV2 |
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| 146 | je SHORT .IdeDeviceFound |
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| 147 | mov al, DEVICE_8BIT_XTIDE_REV1 ; We must have rev 1 |
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[497] | 148 | .IdeDeviceFound: |
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[518] | 149 | clc |
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[497] | 150 | ret |
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| 151 | |
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| 152 | |
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| 153 | ;-------------------------------------------------------------------- |
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[504] | 154 | ; DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH |
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[497] | 155 | ; Parameters: |
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| 156 | ; BL: Offset to IDE Status Register |
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[504] | 157 | ; BH: Offset to Alternative Status Register |
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| 158 | ; DX: IDE Base Port address |
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| 159 | ; SI: IDE Control Block address |
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[497] | 160 | ; Returns: |
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| 161 | ; CF: Clear if IDE Device found |
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| 162 | ; Set if IDE Device not found |
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| 163 | ; Corrupts registers: |
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| 164 | ; AX |
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| 165 | ;-------------------------------------------------------------------- |
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[504] | 166 | DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH: |
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[497] | 167 | ; Read Status and Alternative Status Registers |
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| 168 | push dx |
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| 169 | |
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[504] | 170 | add dl, bl |
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[497] | 171 | cli ; Disable Interrupts |
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[504] | 172 | in al, dx ; Read Status Register... |
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| 173 | mov ah, al ; ...to AH |
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| 174 | mov dx, si |
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| 175 | add dl, bh |
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| 176 | in al, dx ; Read Alternative Status Register to AL |
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[497] | 177 | sti ; Enable Interrupts |
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| 178 | |
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| 179 | pop dx |
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| 180 | ; Fall to CompareIdeStatusRegistersFromALandAH |
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| 181 | |
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| 182 | |
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| 183 | ;-------------------------------------------------------------------- |
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| 184 | ; CompareIdeStatusRegistersFromALandAH |
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| 185 | ; Parameters: |
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[504] | 186 | ; AH: Possible IDE Status Register contents |
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| 187 | ; AL: Possible IDE Alternative Status Register contents |
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[497] | 188 | ; Returns: |
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| 189 | ; CF: Clear if valid Status Register Contents |
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| 190 | ; Set if not possible IDE Status Registers |
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| 191 | ; Corrupts registers: |
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| 192 | ; Nothing |
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| 193 | ;-------------------------------------------------------------------- |
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| 194 | CompareIdeStatusRegistersFromALandAH: |
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| 195 | ; Status Register now in AH and Alternative Status Register in AL. |
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| 196 | ; They must be the same if base port was in use by IDE device. |
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| 197 | cmp al, ah |
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[518] | 198 | jne SHORT NoIdeDeviceFound |
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[497] | 199 | |
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[505] | 200 | ; Bytes were the same but it is possible they were both FFh, for |
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[502] | 201 | ; example. We must make sure bits are what is expected from valid |
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| 202 | ; IDE Status Register. So far all drives I've tested return 50h |
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[518] | 203 | ; (FLG_STATUS_DRDY and FLG_STATUS_DSC set) or 00h. |
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| 204 | ; I suspect that the zero might mean non available drive is selected. For example if Master |
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[504] | 205 | ; drive is present but Slave is selected from IDE Drive and Head Select Register, |
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[518] | 206 | ; then the Status Register can be 00h. We cannot accept 00h as valid byte |
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| 207 | ; since that can easily cause invalid JR-IDE/ISA detections. |
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[497] | 208 | test al, FLG_STATUS_BSY | FLG_STATUS_DF | FLG_STATUS_DRQ | FLG_STATUS_ERR |
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[519] | 209 | jnz SHORT NoIdeDeviceFound ; Busy or Errors cannot be set |
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[497] | 210 | test al, FLG_STATUS_DRDY |
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[519] | 211 | jz SHORT NoIdeDeviceFound ; Device needs to be ready |
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[497] | 212 | ret ; Return with CF cleared |
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| 213 | |
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[504] | 214 | NoIdeDeviceFound: |
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[497] | 215 | stc |
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| 216 | ret |
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| 217 | |
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| 218 | |
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| 219 | ;-------------------------------------------------------------------- |
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[504] | 220 | ; ChangeDifferentControlBlockAddressToSI |
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| 221 | ; Parameters: |
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| 222 | ; DX: IDE Base Port address |
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| 223 | ; SI: IDE Control Block address |
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| 224 | ; Returns: |
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| 225 | ; ZF: Set if SI changed |
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| 226 | ; Cleared if different control block address is not possible |
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| 227 | ; Corrupts registers: |
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| 228 | ; AH |
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| 229 | ;-------------------------------------------------------------------- |
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| 230 | ChangeDifferentControlBlockAddressToSI: |
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| 231 | cmp si, 368h |
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| 232 | je SHORT .TrySecondAlternative |
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| 233 | cmp si, 3E8h |
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| 234 | je SHORT .TrySecondAlternative |
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| 235 | |
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| 236 | cmp si, 360h |
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| 237 | je SHORT .TryLastAlternative |
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| 238 | cmp si, 3E0h |
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| 239 | je SHORT .TryLastAlternative |
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| 240 | ret ; Return with ZF cleared |
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| 241 | |
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| 242 | .TryLastAlternative: |
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| 243 | mov si, DEVICE_ATA_SECONDARY_PORTCTRL + 8 ; Changes to 370h used by Sound Blaster 16 (CT2290) |
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| 244 | ; Fall to .TrySecondAlternative |
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| 245 | .TrySecondAlternative: |
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| 246 | sub si, BYTE 8h ; 368h to 360h, 3E8h to 3E0h |
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| 247 | xor ah, ah ; Set ZF |
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| 248 | ret |
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| 249 | |
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| 250 | |
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| 251 | ;-------------------------------------------------------------------- |
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[497] | 252 | ; IdeAutodetect_IncrementDXtoNextIdeBasePort |
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| 253 | ; Parameters: |
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[518] | 254 | ; DX: Previous IDE Base Port or IDE_PORT_TO_START_DETECTION |
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[497] | 255 | ; Returns: |
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| 256 | ; DX: Next IDE Base Port |
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| 257 | ; ZF: Set if no more Base Ports (DX was last base port on entry) |
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| 258 | ; Clear if new base port returned in DX |
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| 259 | ; Corrupts registers: |
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| 260 | ; AX |
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| 261 | ;-------------------------------------------------------------------- |
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| 262 | ALIGN JUMP_ALIGN |
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| 263 | IdeAutodetect_IncrementDXtoNextIdeBasePort: |
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| 264 | cmp dx, [cs:.wLastIdePort] |
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| 265 | je SHORT .AllPortsAlreadyDetected |
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| 266 | |
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| 267 | push si |
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| 268 | mov si, .rgwIdeBasePorts |
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| 269 | .CompareNextIdeBasePort: |
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| 270 | cmp [cs:si], dx |
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| 271 | lea si, [si+2] ; Increment SI and preserve FLAGS |
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| 272 | jne SHORT .CompareNextIdeBasePort |
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| 273 | |
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| 274 | mov dx, [cs:si] ; Get next port |
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| 275 | test dx, dx ; Clear ZF |
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| 276 | pop si |
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| 277 | .AllPortsAlreadyDetected: |
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| 278 | ret |
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| 279 | |
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| 280 | |
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| 281 | ; All ports used in autodetection. Ports can be in any order. |
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| 282 | ALIGN WORD_ALIGN |
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| 283 | .rgwIdeBasePorts: |
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| 284 | dw IDE_PORT_TO_START_DETECTION ; Must be first |
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[498] | 285 | ; Standard IDE |
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| 286 | dw DEVICE_ATA_PRIMARY_PORT |
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| 287 | dw DEVICE_ATA_SECONDARY_PORT |
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| 288 | dw DEVICE_ATA_TERTIARY_PORT |
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| 289 | dw DEVICE_ATA_QUATERNARY_PORT |
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[497] | 290 | ; 8-bit Devices |
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| 291 | dw 200h |
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| 292 | dw 220h |
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| 293 | dw 240h |
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| 294 | dw 260h |
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| 295 | dw 280h |
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| 296 | dw 2A0h |
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| 297 | dw 2C0h |
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| 298 | dw 2E0h |
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| 299 | dw 300h |
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| 300 | dw 320h |
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| 301 | dw 340h |
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| 302 | dw 360h |
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| 303 | dw 380h |
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| 304 | dw 3A0h |
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| 305 | dw 3C0h |
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| 306 | dw 3E0h |
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[498] | 307 | ; JR-IDE/ISA (Memory Segment Addresses) |
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| 308 | dw 0C000h |
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| 309 | dw 0C400h |
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| 310 | dw 0C800h |
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| 311 | dw 0CC00h |
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| 312 | dw 0D000h |
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| 313 | dw 0D400h |
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| 314 | dw 0D800h |
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[497] | 315 | .wLastIdePort: |
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[498] | 316 | dw 0DC00h |
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