[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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| 30 | ; (ignored at present as 48-bit addressing is not supported)
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| 31 | ; BL: IDE Status Register bit to poll after command
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| 32 | ; (ignored at present, since there is no IDE status register to poll)
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| 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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[181] | 45 |
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[277] | 46 | mov ah,SerialServer_Command_Read
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[181] | 47 |
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[179] | 48 | mov al,[bp+IDEPACK.bCommand]
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[150] | 49 |
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[179] | 50 | cmp al,20h ; Read Sectors IDE command
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| 51 | jz .readOrWrite
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[277] | 52 | inc ah ; now SerialServer_Protocol_Write
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[179] | 53 | cmp al,30h ; Write Sectors IDE command
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| 54 | jz .readOrWrite
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[181] | 55 |
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[179] | 56 | ; all other commands return success
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| 57 | ; including function 0ech which should return drive information, this is handled with the identify functions
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[216] | 58 | ;
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[179] | 59 | xor ah,ah ; also clears carry
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| 60 | ret
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[181] | 61 |
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| 62 | .readOrWrite:
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[526] | 63 | mov [bp+IDEPACK.bFeatures],ah ; store protocol command
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[480] | 64 | call IdeTransfer_NormalizePointerInESSI
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[526] | 65 |
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[233] | 66 | mov dx, [di+DPT_SERIAL.wSerialPortAndBaud]
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[181] | 67 |
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[489] | 68 | ; fall through to SerialCommand_FallThroughToSerialServer_SendReceive
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[526] | 69 |
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[292] | 70 | ALIGN JUMP_ALIGN
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[526] | 71 | SerialCommand_FallThroughToSerialServer_SendReceive:
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[150] | 72 |
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[489] | 73 | ; fall through to SerialServer_SendReceive
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[526] | 74 |
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[292] | 75 | %include "SerialServer.asm"
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[181] | 76 |
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[526] | 77 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
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[334] | 78 | %if SerialCommand_FallThroughToSerialServer_SendReceive <> SerialServer_SendReceive
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| 79 | %error "SerialServer_SendReceive must be the first routine at the top of SerialServer.asm in the Assembly_Library"
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| 80 | %endif
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[292] | 81 | %endif
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| 82 |
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[526] | 83 | ALIGN JUMP_ALIGN
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| 84 | SerialCommand_ReturnError:
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[292] | 85 | stc
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[526] | 86 | ret
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[292] | 87 |
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[150] | 88 | ;--------------------------------------------------------------------
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[179] | 89 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
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| 90 | ; Parameters:
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| 91 | ; BH: Drive Select byte for Drive and Head Select Register
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| 92 | ; DS: Segment to RAMVARS
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| 93 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information
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| 94 | ; CS:BP: Ptr to IDEVARS
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| 95 | ; Returns:
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| 96 | ; CF: Cleared if success, Set if error
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| 97 | ; Corrupts registers:
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| 98 | ; AL, BL, CX, DX, SI, DI, ES
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| 99 | ;--------------------------------------------------------------------
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| 100 | ALIGN JUMP_ALIGN
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| 101 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH:
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[203] | 102 | ;
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[223] | 103 | ; 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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| 104 | ; 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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| 105 | ; through all the COM ports and baud rates a second time.
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[203] | 106 | ;
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[223] | 107 | ; 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] | 108 | ;
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| 109 | ; The decision tree:
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| 110 | ;
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| 111 | ; Master:
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[234] | 112 | ; wSerialPortAndBaud Non-Zero: -> Continue with wSerialPortAndBaud (1)
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| 113 | ; wSerialPortAndBaud Zero:
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| 114 | ; previous serial drive not found: -> Scan (2)
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| 115 | ; previous serial drive found: -> Continue with previous serial drive info (3)
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[223] | 116 | ;
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[203] | 117 | ; Slave:
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[234] | 118 | ; wSerialPortAndBaud Non-Zero:
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| 119 | ; previous serial drive not found: -> Error - Not Found (4)
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[242] | 120 | ; previous serial drive found: -> Continue with wSerialPackedAndBaud (5)
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[234] | 121 | ; wSerialPortAndBaud Zero:
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| 122 | ; previous serial drive not found: -> Error - Not Found (4)
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| 123 | ; previous serial drive found: -> Continue with previous serial drive info (6)
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[203] | 124 | ;
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[223] | 125 | ; (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] | 126 | ; 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] | 127 | ; 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] | 128 | ; (2) We are using the special .ideVarsSerialAuto structure. During drive detection, we would only be here
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[242] | 129 | ; if we hadn't already seen a serial drive (since we only scan if no explicit drives are set),
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[234] | 130 | ; so we go off to scan.
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[223] | 131 | ; (3) We are using the special .ideVarsSerialAuto structure. We won't get here during drive detection, but
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[203] | 132 | ; 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] | 133 | ; in use, and so we use the values from the previously seen serial drive DPT.
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[223] | 134 | ; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time,
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[203] | 135 | ; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we
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| 136 | ; 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] | 137 | ; 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] | 138 | ; margin) will be just one serial controller.
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| 139 | ; (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] | 140 | ; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud
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[203] | 141 | ; to make sure we get the proper drive.
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[223] | 142 | ; (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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| 143 | ; if no serial drive was explicitly set by the user in the configurator or that drive had not been found.
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| 144 | ; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the
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[203] | 145 | ; master scan.
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[223] | 146 | ;
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[233] | 147 | mov dx,[cs:bp+IDEVARS.wSerialPortAndBaud]
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| 148 | xor ax,ax
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[526] | 149 |
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[233] | 150 | push si
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| 151 | call FindDPT_ToDSDIforSerialDevice
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| 152 | pop si
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[258] | 153 | %ifdef MODULE_SERIAL_FLOPPY
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[262] | 154 | jnc .founddpt
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[258] | 155 | ;
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| 156 | ; If not found above with FindDPT_ToDSDIforSerialDevice, DI will point to the DPT after the last hard disk DPT
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[277] | 157 | ; 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] | 158 | ;
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| 159 | cmp byte [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], 0
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| 160 | jz .notfounddpt
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| 161 | .founddpt:
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| 162 | %else
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[277] | 163 | jc .notfounddpt
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[258] | 164 | %endif
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[242] | 165 | mov ax, [di+DPT_SERIAL.wSerialPortAndBaud]
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| 166 | .notfounddpt:
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[223] | 167 |
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[203] | 168 | test bh, FLG_DRVNHEAD_DRV
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| 169 | jz .master
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[179] | 170 |
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[233] | 171 | test ax,ax ; Take care of the case that is different between master and slave.
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[292] | 172 | jz SerialCommand_ReturnError
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[203] | 173 |
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| 174 | ; fall-through
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[223] | 175 | .master:
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[233] | 176 | test dx,dx
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| 177 | jnz .identifyDeviceInDX
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[179] | 178 |
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[277] | 179 | xchg dx, ax ; move ax to dx (move previously found serial drive to dx, could be zero)
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[223] | 180 |
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[292] | 181 | .identifyDeviceInDX:
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[179] | 182 |
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[489] | 183 | ; fall through to SerialCommand_FallThroughToSerialServerScan_ScanForServer
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[526] | 184 |
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[292] | 185 | ALIGN JUMP_ALIGN
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[489] | 186 | SerialCommand_FallThroughToSerialServerScan_ScanForServer:
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| 187 |
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| 188 | ; fall through to SerialServerScan_ScanForServer
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[526] | 189 |
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[292] | 190 | %include "SerialServerScan.asm"
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| 191 |
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[526] | 192 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
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[334] | 193 | %if SerialCommand_FallThroughToSerialServerScan_ScanForServer <> SerialServerScan_ScanForServer
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| 194 | %error "SerialServerScan_ScanForServer must be the first routine at the top of SerialServerScan.asm in the Assembly_Library"
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| 195 | %endif
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| 196 | %endif
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[292] | 197 |
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| 198 |
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