| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Command and port direction functions for different device types. |
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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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| 8 | ; Device_FinalizeDPT |
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| 9 | ; Parameters: |
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| 10 | ; DS:DI: Ptr to Disk Parameter Table |
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| 11 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 12 | ; Returns: |
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| 13 | ; Nothing |
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| 14 | ; Corrupts registers: |
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| 15 | ; AX, BX, CX, DX |
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| 16 | ;-------------------------------------------------------------------- |
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| 17 | Device_FinalizeDPT: |
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| 18 | test WORD [di+DPT.wFlags], FLG_DPT_SERIAL_DEVICE |
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| 19 | jnz SHORT ReturnSuccessForSerialPort |
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| 20 | jmp IdeDPT_Finalize |
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| 21 | .FinalizeDptForSerialPortDevice: |
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| 22 | jmp SerialDPT_Finalize |
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| 23 | |
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| 24 | |
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| 25 | ;-------------------------------------------------------------------- |
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| 26 | ; Device_ResetMasterAndSlaveController |
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| 27 | ; Parameters: |
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| 28 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 29 | ; Returns: |
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| 30 | ; AH: INT 13h Error Code |
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| 31 | ; CF: Cleared if success, Set if error |
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| 32 | ; Corrupts registers: |
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| 33 | ; AL, BX, CX, DX |
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| 34 | ;-------------------------------------------------------------------- |
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| 35 | Device_ResetMasterAndSlaveController: |
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| 36 | test WORD [di+DPT.wFlags], FLG_DPT_SERIAL_DEVICE |
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| 37 | jnz SHORT ReturnSuccessForSerialPort |
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| 38 | jmp IdeCommand_ResetMasterAndSlaveController |
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| 39 | |
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| 40 | |
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| 41 | ;-------------------------------------------------------------------- |
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| 42 | ; Device_IdentifyToBufferInESSIwithDriveSelectByteInBH |
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| 43 | ; Parameters: |
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| 44 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 45 | ; DS: Segment to RAMVARS |
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| 46 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
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| 47 | ; CS:BP: Ptr to IDEVARS |
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| 48 | ; Returns: |
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| 49 | ; AH: INT 13h Error Code |
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| 50 | ; CF: Cleared if success, Set if error |
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| 51 | ; Corrupts registers: |
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| 52 | ; AL, BL, CX, DX, SI, DI, ES |
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| 53 | ;-------------------------------------------------------------------- |
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| 54 | Device_IdentifyToBufferInESSIwithDriveSelectByteInBH: |
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| 55 | cmp BYTE [cs:bp+IDEVARS.bDevice], DEVICE_SERIAL_PORT |
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| 56 | je SHORT .IdentifyDriveFromSerialPort |
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| 57 | jmp IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
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| 58 | .IdentifyDriveFromSerialPort: |
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| 59 | jmp SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
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| 60 | |
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| 61 | |
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| 62 | ;-------------------------------------------------------------------- |
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| 63 | ; Device_OutputCommandWithParameters |
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| 64 | ; Parameters: |
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| 65 | ; BH: Default system timer ticks for timeout (can be ignored) |
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| 66 | ; BL: IDE Status Register bit to poll after command |
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| 67 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 68 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 69 | ; SS:BP: Ptr to IDEPACK |
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| 70 | ; Returns: |
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| 71 | ; AH: INT 13h Error Code |
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| 72 | ; CF: Cleared if success, Set if error |
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| 73 | ; Corrupts registers: |
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| 74 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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| 75 | ;-------------------------------------------------------------------- |
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| 76 | ALIGN JUMP_ALIGN |
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| 77 | Device_OutputCommandWithParameters: |
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| 78 | test WORD [di+DPT.wFlags], FLG_DPT_SERIAL_DEVICE |
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| 79 | jnz SHORT .OutputCommandToSerialPort |
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| 80 | jmp IdeCommand_OutputWithParameters |
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| 81 | ALIGN JUMP_ALIGN |
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| 82 | .OutputCommandToSerialPort: |
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| 83 | jmp SerialCommand_OutputWithParameters |
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| 84 | |
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| 85 | |
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| 86 | ;-------------------------------------------------------------------- |
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| 87 | ; Device_SelectDrive |
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| 88 | ; Parameters: |
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| 89 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 90 | ; SS:BP: Ptr to IDEPACK |
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| 91 | ; Returns: |
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| 92 | ; AH: INT 13h Error Code |
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| 93 | ; CF: Cleared if success, Set if error |
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| 94 | ; Corrupts registers: |
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| 95 | ; AL, BX, CX, DX |
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| 96 | ;-------------------------------------------------------------------- |
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| 97 | ALIGN JUMP_ALIGN |
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| 98 | Device_SelectDrive: |
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| 99 | test WORD [di+DPT.wFlags], FLG_DPT_SERIAL_DEVICE |
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| 100 | jnz SHORT ReturnSuccessForSerialPort |
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| 101 | jmp IdeCommand_SelectDrive |
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| 102 | ReturnSuccessForSerialPort: |
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| 103 | xor ax, ax |
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| 104 | ret |
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| 105 | |
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| 106 | |
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| 107 | ;-------------------------------------------------------------------- |
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| 108 | ; Device_OutputALtoIdeRegisterInDL |
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| 109 | ; Parameters: |
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| 110 | ; AL: Byte to output |
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| 111 | ; DL: IDE Register |
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| 112 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 113 | ; Returns: |
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| 114 | ; Nothing |
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| 115 | ; Corrupts registers: |
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| 116 | ; BX, DX |
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| 117 | ;-------------------------------------------------------------------- |
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| 118 | ALIGN JUMP_ALIGN |
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| 119 | Device_OutputALtoIdeRegisterInDL: |
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| 120 | mov bx, IdeIO_OutputALtoIdeRegisterInDX |
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| 121 | jmp SHORT TranslateRegisterAddressInDLifNecessaryThenJumpToBX |
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| 122 | |
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| 123 | |
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| 124 | ;-------------------------------------------------------------------- |
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| 125 | ; Device_OutputALtoIdeControlBlockRegisterInDL |
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| 126 | ; Parameters: |
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| 127 | ; AL: Byte to output |
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| 128 | ; DL: IDE Control Block Register |
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| 129 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 130 | ; Returns: |
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| 131 | ; Nothing |
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| 132 | ; Corrupts registers: |
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| 133 | ; BX, DX |
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| 134 | ;-------------------------------------------------------------------- |
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| 135 | ALIGN JUMP_ALIGN |
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| 136 | Device_OutputALtoIdeControlBlockRegisterInDL: |
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| 137 | mov bx, IdeIO_OutputALtoIdeControlBlockRegisterInDX |
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| 138 | jmp SHORT TranslateRegisterAddressInDLifNecessaryThenJumpToBX |
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| 139 | |
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| 140 | |
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| 141 | ;-------------------------------------------------------------------- |
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| 142 | ; Device_InputToALfromIdeRegisterInDL |
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| 143 | ; Parameters: |
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| 144 | ; DL: IDE Register |
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| 145 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 146 | ; Returns: |
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| 147 | ; AL: Inputted byte |
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| 148 | ; Corrupts registers: |
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| 149 | ; BX, DX |
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| 150 | ;-------------------------------------------------------------------- |
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| 151 | ALIGN JUMP_ALIGN |
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| 152 | Device_InputToALfromIdeRegisterInDL: |
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| 153 | mov bx, IdeIO_InputToALfromIdeRegisterInDX |
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| 154 | ; Fall to TranslateRegisterAddressInDLifNecessaryThenJumpToBX |
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| 155 | |
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| 156 | |
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| 157 | ;-------------------------------------------------------------------- |
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| 158 | ; TranslateRegisterAddressInDLifNecessaryThenJumpToBX |
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| 159 | ; Parameters: |
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| 160 | ; AL: Byte to output (if output function in BX) |
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| 161 | ; DL: IDE Register |
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| 162 | ; BX: I/O function to jump to |
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| 163 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 164 | ; Returns: |
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| 165 | ; AL: Inputted byte (if input function in BX) |
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| 166 | ; Corrupts registers: |
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| 167 | ; BX, DX |
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| 168 | ;-------------------------------------------------------------------- |
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| 169 | TranslateRegisterAddressInDLifNecessaryThenJumpToBX: |
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| 170 | test WORD [di+DPT.wFlags], FLG_DPT_REVERSED_A0_AND_A3 |
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| 171 | jz SHORT .JumpToIoFunctionInSI |
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| 172 | |
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| 173 | ; Exchange address lines A0 and A3 from DL |
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| 174 | mov dh, MASK_A3_AND_A0_ADDRESS_LINES |
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| 175 | and dh, dl ; DH = 0, 1, 8 or 9, we can ignore 0 and 9 |
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| 176 | jz SHORT .JumpToIoFunctionInSI ; Jump out since DH is 0 |
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| 177 | xor dh, MASK_A3_AND_A0_ADDRESS_LINES |
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| 178 | jz SHORT .JumpToIoFunctionInSI ; Jump out since DH was 9 |
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| 179 | and dl, ~MASK_A3_AND_A0_ADDRESS_LINES |
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| 180 | or dl, dh ; Address lines now reversed |
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| 181 | |
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| 182 | ALIGN JUMP_ALIGN |
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| 183 | .JumpToIoFunctionInSI: |
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| 184 | push bx |
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| 185 | xor dh, dh |
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| 186 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset]; CS:BX now points to IDEVARS |
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| 187 | ret |
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