[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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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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[179] | 8 | ; SerialCommand_OutputWithParameters |
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[150] | 9 | ; Parameters: |
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[179] | 10 | ; BH: Non-zero if 48-bit addressing used |
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| 11 | ; (ignored at present as 48-bit addressing is not supported) |
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| 12 | ; BL: IDE Status Register bit to poll after command |
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| 13 | ; (ignored at present, since there is no IDE status register to poll) |
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| 14 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 15 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 16 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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[150] | 17 | ; Returns: |
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| 18 | ; AH: INT 13h Error Code |
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[258] | 19 | ; CX: Number of successfully transferred sectors (for transfer commands) |
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[150] | 20 | ; CF: Cleared if success, Set if error |
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| 21 | ; Corrupts registers: |
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[179] | 22 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[150] | 23 | ;-------------------------------------------------------------------- |
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| 24 | ALIGN JUMP_ALIGN |
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[179] | 25 | SerialCommand_OutputWithParameters: |
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[181] | 26 | |
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[277] | 27 | mov ah,SerialServer_Command_Read |
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[181] | 28 | |
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[179] | 29 | mov al,[bp+IDEPACK.bCommand] |
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[150] | 30 | |
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[179] | 31 | cmp al,20h ; Read Sectors IDE command |
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| 32 | jz .readOrWrite |
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[277] | 33 | inc ah ; now SerialServer_Protocol_Write |
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[179] | 34 | cmp al,30h ; Write Sectors IDE command |
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| 35 | jz .readOrWrite |
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[181] | 36 | |
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[179] | 37 | ; all other commands return success |
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| 38 | ; including function 0ech which should return drive information, this is handled with the identify functions |
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[216] | 39 | ; |
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[179] | 40 | xor ah,ah ; also clears carry |
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| 41 | ret |
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[181] | 42 | |
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| 43 | .readOrWrite: |
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[179] | 44 | mov [bp+IDEPACK.bFeatures],ah ; store protocol command |
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[181] | 45 | |
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[233] | 46 | mov dx, [di+DPT_SERIAL.wSerialPortAndBaud] |
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[181] | 47 | |
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[277] | 48 | jmp SerialServer_SendReceive |
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[150] | 49 | |
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[181] | 50 | |
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[150] | 51 | ;-------------------------------------------------------------------- |
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[179] | 52 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
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| 53 | ; Parameters: |
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| 54 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 55 | ; DS: Segment to RAMVARS |
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| 56 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
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| 57 | ; CS:BP: Ptr to IDEVARS |
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| 58 | ; Returns: |
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| 59 | ; CF: Cleared if success, Set if error |
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| 60 | ; Corrupts registers: |
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| 61 | ; AL, BL, CX, DX, SI, DI, ES |
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| 62 | ;-------------------------------------------------------------------- |
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| 63 | ALIGN JUMP_ALIGN |
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| 64 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH: |
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[203] | 65 | ; |
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[223] | 66 | ; 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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| 67 | ; 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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| 68 | ; through all the COM ports and baud rates a second time. |
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[203] | 69 | ; |
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[223] | 70 | ; 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] | 71 | ; |
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| 72 | ; The decision tree: |
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| 73 | ; |
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| 74 | ; Master: |
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[234] | 75 | ; wSerialPortAndBaud Non-Zero: -> Continue with wSerialPortAndBaud (1) |
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| 76 | ; wSerialPortAndBaud Zero: |
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| 77 | ; previous serial drive not found: -> Scan (2) |
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| 78 | ; previous serial drive found: -> Continue with previous serial drive info (3) |
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[223] | 79 | ; |
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[203] | 80 | ; Slave: |
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[234] | 81 | ; wSerialPortAndBaud Non-Zero: |
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| 82 | ; previous serial drive not found: -> Error - Not Found (4) |
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[242] | 83 | ; previous serial drive found: -> Continue with wSerialPackedAndBaud (5) |
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[234] | 84 | ; wSerialPortAndBaud Zero: |
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| 85 | ; previous serial drive not found: -> Error - Not Found (4) |
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| 86 | ; previous serial drive found: -> Continue with previous serial drive info (6) |
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[203] | 87 | ; |
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[223] | 88 | ; (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] | 89 | ; 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] | 90 | ; 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] | 91 | ; (2) We are using the special .ideVarsSerialAuto structure. During drive detection, we would only be here |
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[242] | 92 | ; if we hadn't already seen a serial drive (since we only scan if no explicit drives are set), |
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[234] | 93 | ; so we go off to scan. |
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[223] | 94 | ; (3) We are using the special .ideVarsSerialAuto structure. We won't get here during drive detection, but |
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[203] | 95 | ; 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] | 96 | ; in use, and so we use the values from the previously seen serial drive DPT. |
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[223] | 97 | ; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time, |
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[203] | 98 | ; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we |
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| 99 | ; 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] | 100 | ; 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] | 101 | ; margin) will be just one serial controller. |
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| 102 | ; (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] | 103 | ; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud |
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[203] | 104 | ; to make sure we get the proper drive. |
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[223] | 105 | ; (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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| 106 | ; if no serial drive was explicitly set by the user in the configurator or that drive had not been found. |
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| 107 | ; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the |
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[203] | 108 | ; master scan. |
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[223] | 109 | ; |
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[233] | 110 | mov dx,[cs:bp+IDEVARS.wSerialPortAndBaud] |
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| 111 | xor ax,ax |
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[277] | 112 | |
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[233] | 113 | push si |
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| 114 | call FindDPT_ToDSDIforSerialDevice |
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| 115 | pop si |
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[258] | 116 | %ifdef MODULE_SERIAL_FLOPPY |
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[262] | 117 | jnc .founddpt |
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[258] | 118 | ; |
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| 119 | ; If not found above with FindDPT_ToDSDIforSerialDevice, DI will point to the DPT after the last hard disk DPT |
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[277] | 120 | ; 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] | 121 | ; |
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| 122 | cmp byte [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], 0 |
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| 123 | jz .notfounddpt |
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| 124 | .founddpt: |
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| 125 | %else |
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[277] | 126 | jc .notfounddpt |
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[258] | 127 | %endif |
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[242] | 128 | mov ax, [di+DPT_SERIAL.wSerialPortAndBaud] |
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| 129 | .notfounddpt: |
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[223] | 130 | |
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[203] | 131 | test bh, FLG_DRVNHEAD_DRV |
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| 132 | jz .master |
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[179] | 133 | |
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[233] | 134 | test ax,ax ; Take care of the case that is different between master and slave. |
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[277] | 135 | jz .error |
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[203] | 136 | |
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| 137 | ; fall-through |
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[223] | 138 | .master: |
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[233] | 139 | test dx,dx |
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| 140 | jnz .identifyDeviceInDX |
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[179] | 141 | |
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[277] | 142 | xchg dx, ax ; move ax to dx (move previously found serial drive to dx, could be zero) |
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[223] | 143 | |
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[277] | 144 | .identifyDeviceInDX: |
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| 145 | jmp SerialServerScan_ScanForServer |
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[179] | 146 | |
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[223] | 147 | .error: |
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[181] | 148 | stc |
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[203] | 149 | ret |
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