[150] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Serial Device Command functions. |
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| 3 | |
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[376] | 4 | ; |
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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[526] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[526] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[526] | 18 | ; |
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[376] | 19 | |
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[150] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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[292] | 23 | %define SERIALSERVER_AH_ALREADY_HAS_COMMAND_BYTE |
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[526] | 24 | %define SERIALSERVER_NO_ZERO_SECTOR_COUNTS |
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[292] | 25 | |
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[150] | 26 | ;-------------------------------------------------------------------- |
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[179] | 27 | ; SerialCommand_OutputWithParameters |
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[150] | 28 | ; Parameters: |
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[179] | 29 | ; BH: Non-zero if 48-bit addressing used |
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[567] | 30 | ; (ignored at present as 48-bit addressing is not supported) |
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[179] | 31 | ; BL: IDE Status Register bit to poll after command |
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[567] | 32 | ; (ignored at present, since there is no IDE status register to poll) |
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[179] | 33 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 34 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 35 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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[150] | 36 | ; Returns: |
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| 37 | ; AH: INT 13h Error Code |
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[258] | 38 | ; CX: Number of successfully transferred sectors (for transfer commands) |
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[150] | 39 | ; CF: Cleared if success, Set if error |
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| 40 | ; Corrupts registers: |
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[179] | 41 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[150] | 42 | ;-------------------------------------------------------------------- |
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| 43 | ALIGN JUMP_ALIGN |
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[179] | 44 | SerialCommand_OutputWithParameters: |
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[601] | 45 | mov ah, SerialServer_Command_Read |
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| 46 | mov al, [bp+IDEPACK.bCommand] |
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[181] | 47 | |
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[601] | 48 | cmp al, 20h ; Read Sectors IDE command |
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| 49 | je SHORT .readOrWrite |
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| 50 | inc ah ; now SerialServer_Protocol_Write |
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| 51 | cmp al, 30h ; Write Sectors IDE command |
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| 52 | je SHORT .readOrWrite |
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[181] | 53 | |
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[179] | 54 | ; all other commands return success |
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| 55 | ; including function 0ech which should return drive information, this is handled with the identify functions |
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[216] | 56 | ; |
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[601] | 57 | xor ah, ah ; also clears carry |
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| 58 | ret |
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[181] | 59 | |
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| 60 | .readOrWrite: |
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[601] | 61 | mov [bp+IDEPACK.bFeatures], ah ; store protocol command |
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[538] | 62 | %ifdef USE_AT |
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[601] | 63 | mov dh, [bp+IDEPACK.bSectorCount] |
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[538] | 64 | %endif |
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[601] | 65 | call IdeTransfer_NormalizePointerInESSI |
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[538] | 66 | %ifdef USE_AT |
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[601] | 67 | jnc SHORT .PointerNormalizationWasSuccessful |
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| 68 | xor cx, cx ; Nothing transferred |
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| 69 | stc |
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| 70 | ret |
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[558] | 71 | .PointerNormalizationWasSuccessful: |
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[538] | 72 | %endif |
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[526] | 73 | |
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[601] | 74 | mov dx, [di+DPT_SERIAL.wSerialPortAndBaud] |
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[489] | 75 | ; fall through to SerialCommand_FallThroughToSerialServer_SendReceive |
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[526] | 76 | |
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[292] | 77 | ALIGN JUMP_ALIGN |
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[526] | 78 | SerialCommand_FallThroughToSerialServer_SendReceive: |
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[489] | 79 | ; fall through to SerialServer_SendReceive |
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[292] | 80 | %include "SerialServer.asm" |
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[181] | 81 | |
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[526] | 82 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[334] | 83 | %if SerialCommand_FallThroughToSerialServer_SendReceive <> SerialServer_SendReceive |
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| 84 | %error "SerialServer_SendReceive must be the first routine at the top of SerialServer.asm in the Assembly_Library" |
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| 85 | %endif |
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[292] | 86 | %endif |
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| 87 | |
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[526] | 88 | ALIGN JUMP_ALIGN |
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| 89 | SerialCommand_ReturnError: |
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[601] | 90 | stc |
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| 91 | ret |
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[292] | 92 | |
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[150] | 93 | ;-------------------------------------------------------------------- |
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[179] | 94 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
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| 95 | ; Parameters: |
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| 96 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 97 | ; DS: Segment to RAMVARS |
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| 98 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
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| 99 | ; CS:BP: Ptr to IDEVARS |
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| 100 | ; Returns: |
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| 101 | ; CF: Cleared if success, Set if error |
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| 102 | ; Corrupts registers: |
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| 103 | ; AL, BL, CX, DX, SI, DI, ES |
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| 104 | ;-------------------------------------------------------------------- |
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| 105 | ALIGN JUMP_ALIGN |
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| 106 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH: |
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[203] | 107 | ; |
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[223] | 108 | ; To improve boot time, we do our best to avoid looking for slave serial drives when we already know the results |
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| 109 | ; from the looking for a master. This is particularly true when doing a COM port scan, as we will end up running |
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| 110 | ; through all the COM ports and baud rates a second time. |
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[203] | 111 | ; |
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[223] | 112 | ; But drive detection isn't the only case - we also need to get the right drive when called on int13h/25h. |
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[203] | 113 | ; |
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| 114 | ; The decision tree: |
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| 115 | ; |
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| 116 | ; Master: |
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[234] | 117 | ; wSerialPortAndBaud Non-Zero: -> Continue with wSerialPortAndBaud (1) |
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| 118 | ; wSerialPortAndBaud Zero: |
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[567] | 119 | ; previous serial drive not found: -> Scan (2) |
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| 120 | ; previous serial drive found: -> Continue with previous serial drive info (3) |
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[223] | 121 | ; |
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[203] | 122 | ; Slave: |
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[234] | 123 | ; wSerialPortAndBaud Non-Zero: |
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[567] | 124 | ; previous serial drive not found: -> Error - Not Found (4) |
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[242] | 125 | ; previous serial drive found: -> Continue with wSerialPackedAndBaud (5) |
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[567] | 126 | ; wSerialPortAndBaud Zero: |
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| 127 | ; previous serial drive not found: -> Error - Not Found (4) |
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[234] | 128 | ; previous serial drive found: -> Continue with previous serial drive info (6) |
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[203] | 129 | ; |
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[223] | 130 | ; (1) This was a port/baud that was explicitly set with the configurator. In the drive detection case, as this |
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[234] | 131 | ; is the Master, we are checking out a new controller, and so don't care if we already have a serial drive. |
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[203] | 132 | ; And as with the int13h/25h case, we just go off and get the needed information using the user's setting. |
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[223] | 133 | ; (2) We are using the special .ideVarsSerialAuto structure. During drive detection, we would only be here |
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[242] | 134 | ; if we hadn't already seen a serial drive (since we only scan if no explicit drives are set), |
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[234] | 135 | ; so we go off to scan. |
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[223] | 136 | ; (3) We are using the special .ideVarsSerialAuto structure. We won't get here during drive detection, but |
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[203] | 137 | ; we might get here on an int13h/25h call. If we have scanned COM drives, they are the ONLY serial drives |
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[234] | 138 | ; in use, and so we use the values from the previously seen serial drive DPT. |
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[223] | 139 | ; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time, |
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[203] | 140 | ; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we |
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| 141 | ; will scan for a slave even if a master is not present. Note that if ANY master had been previously found, |
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[223] | 142 | ; we will do the slave scan, which isn't harmful, it just wastes time. But the most common case (by a wide |
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[203] | 143 | ; margin) will be just one serial controller. |
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| 144 | ; (5) A COM port scan for a master had been previously completed, and a drive was found. In a multiple serial |
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[223] | 145 | ; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud |
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[203] | 146 | ; to make sure we get the proper drive. |
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[223] | 147 | ; (6) A COM port scan for a master had been previously completed, and a drive was found. We would only get here |
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| 148 | ; if no serial drive was explicitly set by the user in the configurator or that drive had not been found. |
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| 149 | ; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the |
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[203] | 150 | ; master scan. |
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[223] | 151 | ; |
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[601] | 152 | mov dx, [cs:bp+IDEVARS.wSerialPortAndBaud] |
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| 153 | xor ax, ax |
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[526] | 154 | |
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[601] | 155 | push si |
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[621] | 156 | call FindDPT_ToDSDIforSerialDevice ; Preserves AX |
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[601] | 157 | pop si |
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[258] | 158 | %ifdef MODULE_SERIAL_FLOPPY |
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[601] | 159 | jnc SHORT .founddpt |
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[258] | 160 | ; |
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| 161 | ; If not found above with FindDPT_ToDSDIforSerialDevice, DI will point to the DPT after the last hard disk DPT |
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[277] | 162 | ; So, if there was a previously found floppy disk, DI will point to that DPT and we use that value for the slave. |
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[258] | 163 | ; |
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[621] | 164 | cmp [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al ; Zero? |
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[601] | 165 | je SHORT .notfounddpt |
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[258] | 166 | .founddpt: |
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| 167 | %else |
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[601] | 168 | jc SHORT .notfounddpt |
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[258] | 169 | %endif |
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[601] | 170 | mov ax, [di+DPT_SERIAL.wSerialPortAndBaud] |
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[242] | 171 | .notfounddpt: |
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[601] | 172 | test bh, FLG_DRVNHEAD_DRV |
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| 173 | jz SHORT .master |
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[223] | 174 | |
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[601] | 175 | test ax, ax ; Take care of the case that is different between master and slave. |
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| 176 | jz SHORT SerialCommand_ReturnError |
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[179] | 177 | |
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[203] | 178 | ; fall-through |
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[223] | 179 | .master: |
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[601] | 180 | test dx, dx |
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| 181 | jnz SHORT .identifyDeviceInDX |
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[179] | 182 | |
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[601] | 183 | xchg dx, ax ; move ax to dx (move previously found serial drive to dx, could be zero) |
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[223] | 184 | |
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[292] | 185 | .identifyDeviceInDX: |
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[489] | 186 | ; fall through to SerialCommand_FallThroughToSerialServerScan_ScanForServer |
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[526] | 187 | |
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[292] | 188 | ALIGN JUMP_ALIGN |
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[489] | 189 | SerialCommand_FallThroughToSerialServerScan_ScanForServer: |
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| 190 | ; fall through to SerialServerScan_ScanForServer |
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[292] | 191 | %include "SerialServerScan.asm" |
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| 192 | |
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[526] | 193 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[334] | 194 | %if SerialCommand_FallThroughToSerialServerScan_ScanForServer <> SerialServerScan_ScanForServer |
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| 195 | %error "SerialServerScan_ScanForServer must be the first routine at the top of SerialServerScan.asm in the Assembly_Library" |
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| 196 | %endif |
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| 197 | %endif |
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[292] | 198 | |
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