[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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[179] | 7 | ;--------------- UART Equates ----------------------------- |
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| 8 | ; |
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| 9 | ; Serial Programming References: |
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| 10 | ; http://en.wikibooks.org/wiki/Serial_Programming |
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| 11 | ; |
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| 12 | |
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| 13 | SerialCommand_UART_base EQU 0 |
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| 14 | SerialCommand_UART_transmitByte EQU 0 |
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| 15 | SerialCommand_UART_receiveByte EQU 0 |
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| 16 | SerialCommand_UART_divisorLow EQU 0 |
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| 17 | ; Values for UART_divisorLow: |
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| 18 | ; 60h = 1200, 30h = 2400, 18h = 4800, 0ch = 9600, 6 = 19200, 3 = 38400, 2 = 57600, 1 = 115200 |
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| 19 | |
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| 20 | SerialCommand_UART_divisorLow_startingBaud EQU 030h |
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| 21 | ; We support 4 baud rates, starting here going higher and skipping every other baud rate |
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| 22 | ; Starting with 30h, that means 30h (1200 baud), 0ch (9600 baud), 3 (38400 baud), and 1 (115200 baud) |
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| 23 | ; Note: hardware baud multipliers (2x, 4x) will impact the final baud rate and are not known at this level |
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| 24 | |
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| 25 | SerialCommand_UART_interruptEnable EQU 1 |
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| 26 | SerialCommand_UART_divisorHigh EQU 1 |
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| 27 | ; UART_divisorHigh is zero for all speeds including and above 1200 baud |
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| 28 | |
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| 29 | SerialCommand_UART_interruptIdent EQU 2 |
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| 30 | SerialCommand_UART_FIFOControl EQU 2 |
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| 31 | |
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| 32 | SerialCommand_UART_lineControl EQU 3 |
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| 33 | |
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| 34 | SerialCommand_UART_modemControl EQU 4 |
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| 35 | |
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| 36 | SerialCommand_UART_lineStatus EQU 5 |
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| 37 | |
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| 38 | SerialCommand_UART_modemStatus EQU 6 |
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| 39 | |
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| 40 | SerialCommand_UART_scratch EQU 7 |
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| 41 | |
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| 42 | SerialCommand_PackedPortAndBaud_StartingPort EQU 240h |
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| 43 | SerialCommand_PackedPortAndBaud_PortMask EQU 0fch ; upper 6 bits - 240h through 438h |
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| 44 | SerialCommand_PackedPortAndBaud_BaudMask EQU 3 ; lower 2 bits - 4 baud rates |
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| 45 | |
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| 46 | SerialCommand_Protocol_Write EQU 3 |
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| 47 | SerialCommand_Protocol_Read EQU 2 |
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| 48 | SerialCommand_Protocol_Inquire EQU 0 |
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| 49 | SerialCommand_Protocol_Header EQU 0a0h |
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| 50 | |
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[150] | 51 | ;-------------------------------------------------------------------- |
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[179] | 52 | ; SerialCommand_OutputWithParameters |
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[150] | 53 | ; Parameters: |
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[179] | 54 | ; BH: Non-zero if 48-bit addressing used |
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| 55 | ; (ignored at present as 48-bit addressing is not supported) |
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| 56 | ; BL: IDE Status Register bit to poll after command |
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| 57 | ; (ignored at present, since there is no IDE status register to poll) |
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| 58 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 59 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 60 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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[150] | 61 | ; Returns: |
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| 62 | ; AH: INT 13h Error Code |
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| 63 | ; CF: Cleared if success, Set if error |
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| 64 | ; Corrupts registers: |
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[179] | 65 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[150] | 66 | ;-------------------------------------------------------------------- |
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[179] | 67 | |
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[150] | 68 | ALIGN JUMP_ALIGN |
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[179] | 69 | SerialCommand_OutputWithParameters: |
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| 70 | |
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| 71 | mov ah,(SerialCommand_Protocol_Header | SerialCommand_Protocol_Read) |
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| 72 | |
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| 73 | mov al,[bp+IDEPACK.bCommand] |
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[150] | 74 | |
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[179] | 75 | cmp al,20h ; Read Sectors IDE command |
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| 76 | jz .readOrWrite |
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| 77 | inc ah ; now SerialCommand_Protocol_Write |
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| 78 | cmp al,30h ; Write Sectors IDE command |
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| 79 | jz .readOrWrite |
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| 80 | |
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| 81 | ; all other commands return success |
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| 82 | ; including function 0ech which should return drive information, this is handled with the identify functions |
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| 83 | xor ah,ah ; also clears carry |
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| 84 | ret |
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| 85 | |
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| 86 | .readOrWrite: |
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| 87 | mov [bp+IDEPACK.bFeatures],ah ; store protocol command |
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| 88 | |
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| 89 | mov dl, byte [ds:di+DPT.bSerialPortAndBaud] |
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| 90 | |
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| 91 | ; fall-through |
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[150] | 92 | |
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| 93 | ;-------------------------------------------------------------------- |
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[179] | 94 | ; SerialCommand_OutputWithParameters_DeviceInDL |
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[150] | 95 | ; Parameters: |
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[179] | 96 | ; AH: Protocol Command |
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| 97 | ; DL: Packed I/O port and baud rate |
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[150] | 98 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 99 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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| 100 | ; Returns: |
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| 101 | ; AH: INT 13h Error Code |
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| 102 | ; CF: Cleared if success, Set if error |
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| 103 | ; Corrupts registers: |
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| 104 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[179] | 105 | ;-------------------------------------------------------------------- |
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| 106 | SerialCommand_OutputWithParameters_DeviceInDL: |
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| 107 | |
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| 108 | push si |
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| 109 | push di |
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| 110 | push bp |
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| 111 | push es |
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| 112 | |
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| 113 | ; |
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| 114 | ; Unpack I/O port and baud from DPT |
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| 115 | ; Port to DX more or less for the remainder of the routine |
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| 116 | ; Baud in CH until UART initialization is complete |
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| 117 | ; |
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| 118 | mov cl, dl |
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| 119 | |
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| 120 | and cl, SerialCommand_PackedPortAndBaud_BaudMask |
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| 121 | shl cl, 1 |
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| 122 | mov ch, SerialCommand_UART_divisorLow_startingBaud |
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| 123 | shr ch, cl |
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| 124 | adc ch, 0 |
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| 125 | |
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| 126 | and dl, SerialCommand_PackedPortAndBaud_PortMask |
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| 127 | mov dh, 0 |
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| 128 | shl dx, 1 |
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| 129 | add dx, SerialCommand_PackedPortAndBaud_StartingPort |
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| 130 | |
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| 131 | ; |
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| 132 | ; Buffer is referenced through ES:DI throughout, since we need to store faster than we read |
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| 133 | ; |
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| 134 | mov di,si |
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| 135 | |
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| 136 | mov al,[bp+IDEPACK.bSectorCount] |
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| 137 | |
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| 138 | ; |
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| 139 | ; Command byte and sector count live at the top of the stack, pop/push are used to access |
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| 140 | ; |
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| 141 | push ax |
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| 142 | |
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| 143 | cld |
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| 144 | |
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| 145 | ;---------------------------------------------------------------------- |
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| 146 | ; |
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| 147 | ; Initialize UART |
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| 148 | ; |
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| 149 | ; We do this each time since DOS (at boot) or another program may have |
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| 150 | ; decided to reprogram the UART |
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| 151 | ; |
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| 152 | push dx |
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| 153 | |
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| 154 | mov al,83h |
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| 155 | add dl,SerialCommand_UART_lineControl |
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| 156 | out dx,al |
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| 157 | |
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| 158 | mov al,ch |
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| 159 | pop dx ; divisor low |
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| 160 | out dx,al |
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| 161 | |
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| 162 | xor ax,ax |
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| 163 | inc dx ; divisor high |
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| 164 | push dx |
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| 165 | out dx,al |
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| 166 | |
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| 167 | mov al,047h |
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| 168 | inc dx ; fifo |
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| 169 | out dx,al |
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| 170 | |
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| 171 | mov al,03h |
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| 172 | inc dx ; linecontrol |
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| 173 | out dx,al |
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| 174 | |
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| 175 | mov al,0bh |
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| 176 | inc dx ; modemcontrol |
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| 177 | out dx,al |
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| 178 | |
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| 179 | pop dx ; base, interrupts disabled |
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| 180 | xor ax,ax |
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| 181 | out dx,al |
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| 182 | dec dx |
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| 183 | |
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| 184 | ;---------------------------------------------------------------------- |
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| 185 | ; |
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| 186 | ; Send Command |
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| 187 | ; |
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| 188 | ; Sends first six bytes of IDEREGS_AND_INTPACK as the command |
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| 189 | ; |
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| 190 | call Registers_NormalizeESDI |
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| 191 | |
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| 192 | push es ; save off real buffer location |
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| 193 | push di |
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| 194 | |
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| 195 | mov di,bp ; point to IDEREGS for command dispatch; |
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| 196 | push ss |
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| 197 | pop es |
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| 198 | |
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| 199 | xor si,si ; initialize checksum for write |
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| 200 | dec si |
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| 201 | mov bp,si |
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| 202 | |
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| 203 | mov bl,03h ; writing 3 words |
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| 204 | |
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| 205 | call SerialCommand_WriteProtocol |
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| 206 | |
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| 207 | pop di ; restore real buffer location |
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| 208 | pop es |
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| 209 | |
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| 210 | pop ax ; load command byte (done before call to .nextSector on subsequent iterations) |
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| 211 | push ax |
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| 212 | |
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| 213 | ; |
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| 214 | ; Top of the read/write loop, one iteration per sector |
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| 215 | ; |
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| 216 | .nextSector: |
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| 217 | xor si,si ; initialize checksum for read or write |
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| 218 | dec si |
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| 219 | mov bp,si |
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| 220 | |
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| 221 | mov bx,0100h |
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| 222 | |
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| 223 | shr ah,1 ; command byte, are we doing a write? |
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| 224 | jnc .readSector |
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| 225 | call SerialCommand_WriteProtocol |
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| 226 | |
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| 227 | xor bx,bx |
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| 228 | |
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| 229 | .readSector: |
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| 230 | mov cx,bx |
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| 231 | inc cx |
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| 232 | |
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| 233 | mov bl,dl ; setup bl with proper values for read loop (bh comes later) |
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| 234 | |
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| 235 | ;---------------------------------------------------------------------- |
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| 236 | ; |
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| 237 | ; Timeout |
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| 238 | ; |
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| 239 | ; During read, we first poll in a tight loop, interrupts off, for the next character to come in |
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| 240 | ; If that loop completes, then we assume there is a long delay involved, turn interrupts back on |
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| 241 | ; and wait for a given number of timer ticks to pass. |
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| 242 | ; |
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| 243 | ; To save code space, we use the contents of DL to decide which byte in the word to return for reading. |
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| 244 | ; |
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| 245 | .readTimeout: |
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| 246 | push cx |
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| 247 | xor cx,cx |
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| 248 | .readTimeoutLoop: |
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| 249 | push dx |
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| 250 | or dl,SerialCommand_UART_lineStatus |
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| 251 | in al,dx |
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| 252 | pop dx |
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| 253 | shr al,1 |
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| 254 | jc .readTimeoutComplete |
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| 255 | loop .readTimeoutLoop |
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| 256 | sti |
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| 257 | mov bh,1 |
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| 258 | call SerialCommand_WaitAndPoll_Init |
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| 259 | cli |
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| 260 | .readTimeoutComplete: |
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| 261 | mov bh,bl |
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| 262 | or bh,SerialCommand_UART_lineStatus |
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| 263 | |
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| 264 | pop cx |
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| 265 | test dl,1 |
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| 266 | jz .readByte1Ready |
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| 267 | jmp .readByte2Ready |
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| 268 | |
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| 269 | ;---------------------------------------------------------------------------- |
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| 270 | ; |
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| 271 | ; Read Block (without interrupts, used when there is a FIFO, high speed) |
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| 272 | ; |
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| 273 | ; NOTE: This loop is very time sensitive. Literally, another instruction |
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| 274 | ; cannot be inserted into this loop without us falling behind at high |
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| 275 | ; speed (460.8K baud) on a 4.77Mhz 8088, making it hard to receive |
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| 276 | ; a full 512 byte block. |
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| 277 | ; |
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| 278 | .readLoop: |
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| 279 | add bp, ax ; update Fletcher's checksum |
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| 280 | adc bp, 0 |
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| 281 | add si, bp |
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| 282 | adc si, 0 |
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| 283 | |
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| 284 | stosw ; store word in caller's data buffer |
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| 285 | |
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| 286 | mov dl,bh |
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| 287 | in al,dx |
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| 288 | shr al,1 ; data ready (byte 1)? |
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| 289 | mov dl,bl ; get ready to read data |
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| 290 | jnc .readTimeout ; nope not ready, update timeouts |
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| 291 | |
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| 292 | ; |
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| 293 | ; Entry point after initial timeout. We enter here so that the checksum word |
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| 294 | ; is not stored (and is left in AX after the loop is complete). |
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| 295 | ; |
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| 296 | .readByte1Ready: |
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| 297 | in al, dx ; read data byte 1 |
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| 298 | |
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| 299 | mov ah, al ; store byte in ah for now |
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| 300 | |
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| 301 | ; |
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| 302 | ; note the placement of this reset of dl to bh, and that it is |
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| 303 | ; before the return, which is assymetric with where this is done |
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| 304 | ; above for byte 1. The value of dl is used by the timeout routine |
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| 305 | ; to know which byte to return to (.read_byte1_ready or |
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| 306 | ; .read_byte2_ready) |
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| 307 | ; |
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| 308 | mov dl,bh |
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| 309 | |
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| 310 | in al,dx |
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| 311 | shr al,1 ; data ready (byte 2)? |
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| 312 | jnc .readTimeout |
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| 313 | .readByte2Ready: |
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| 314 | mov dl,bl |
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| 315 | in al, dx ; read data byte 2 |
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| 316 | |
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| 317 | xchg al, ah ; ah was holding byte 1, reverse byte order |
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| 318 | |
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| 319 | loop .readLoop |
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| 320 | |
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| 321 | ; |
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| 322 | ; Compare checksums |
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| 323 | ; |
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| 324 | xor bp,si |
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| 325 | cmp ax,bp |
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| 326 | jnz SerialCommand_OutputWithParameters_Error |
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| 327 | |
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| 328 | sti ; interrupts back on ASAP, if we turned them off |
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| 329 | |
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| 330 | ;---------------------------------------------------------------------- |
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| 331 | ; |
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| 332 | ; Clear read buffer |
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| 333 | ; |
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| 334 | ; In case there are extra characters or an error in the FIFO, clear it out. |
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| 335 | ; In theory the initialization of the UART registers above should have |
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| 336 | ; taken care of this, but I have seen cases where this is not true. |
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| 337 | ; |
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| 338 | .clearBuffer: |
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| 339 | mov dl,bh |
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| 340 | in al,dx |
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| 341 | mov dl,bl |
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| 342 | test al,08fh |
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| 343 | jz .clearBufferComplete |
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| 344 | shr al,1 |
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| 345 | in al,dx |
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| 346 | jc .clearBuffer ; note CF from shr above |
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| 347 | jmp SerialCommand_OutputWithParameters_Error |
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| 348 | |
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| 349 | .clearBufferComplete: |
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| 350 | pop ax ; sector count and command byte |
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| 351 | dec al ; decrememnt sector count |
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| 352 | push ax ; save |
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| 353 | jz SerialCommand_OutputWithParameters_ReturnCodeInALCF ; CF clear from .clearBuffer test above |
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| 354 | |
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| 355 | cli ; interrupts back off for ACK byte to host |
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| 356 | ; (host could start sending data immediately) |
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| 357 | out dx,al ; ACK with next sector number |
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| 358 | |
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| 359 | jmp .nextSector ; all is well, time for next sector |
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| 360 | |
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| 361 | ;--------------------------------------------------------------------------- |
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| 362 | ; |
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| 363 | ; Cleanup, error reporting, and exit |
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| 364 | ; |
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| 365 | |
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| 366 | ; |
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| 367 | ; Used in situations where a call is underway, such as with SerialCommand_WaitAndPoll |
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| 368 | ; |
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| 369 | SerialCommand_OutputWithParameters_ErrorAndPop2Words: |
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| 370 | pop ax |
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| 371 | pop ax |
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| 372 | |
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| 373 | SerialCommand_OutputWithParameters_Error: |
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| 374 | mov al,1 |
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| 375 | stc |
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| 376 | |
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| 377 | SerialCommand_OutputWithParameters_ReturnCodeInALCF: |
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| 378 | mov ah,al |
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| 379 | sti |
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| 380 | |
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| 381 | pop bp ; recover ax from stack, throw away |
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| 382 | |
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| 383 | pop es |
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| 384 | pop bp |
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| 385 | pop di |
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| 386 | pop si |
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| 387 | |
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| 388 | ret |
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| 389 | |
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[150] | 390 | ;-------------------------------------------------------------------- |
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[179] | 391 | ; SerialCommand_WaitAndPoll |
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| 392 | ; |
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| 393 | ; Parameters: |
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| 394 | ; BH: UART_LineStatus bit to test (20h for write, or 1h for read) |
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| 395 | ; DX: Port address (OK if already incremented to UART_lineStatus) |
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| 396 | ; Stack: 2 words on the stack below the command/count word |
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| 397 | ; Returns: |
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| 398 | ; Returns when desired UART_LineStatus bit is cleared |
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| 399 | ; Jumps directly to error exit if timeout elapses (and cleans up stack) |
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| 400 | ; Corrupts registers: |
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| 401 | ; CX, flags |
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| 402 | ;-------------------------------------------------------------------- |
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| 403 | |
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| 404 | SerialCommand_WaitAndPoll_SoftDelayTicks EQU 20 |
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| 405 | |
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| 406 | ALIGN JUMP_ALIGN |
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| 407 | SerialCommand_WaitAndPoll_Init: |
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| 408 | mov cl,SerialCommand_WaitAndPoll_SoftDelayTicks |
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| 409 | call Timer_InitializeTimeoutWithTicksInCL |
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| 410 | ; fall-through |
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| 411 | |
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| 412 | SerialCommand_WaitAndPoll: |
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| 413 | call Timer_SetCFifTimeout |
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| 414 | jc SerialCommand_OutputWithParameters_ErrorAndPop2Words |
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| 415 | push dx |
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| 416 | push ax |
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| 417 | or dl,SerialCommand_UART_lineStatus |
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| 418 | in al,dx |
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| 419 | test al,bh |
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| 420 | pop ax |
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| 421 | pop dx |
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| 422 | jz SerialCommand_WaitAndPoll |
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| 423 | ; fall-through |
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| 424 | |
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| 425 | SerialCommand_WaitAndPoll_Done: |
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| 426 | ret |
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| 427 | |
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| 428 | ;-------------------------------------------------------------------- |
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| 429 | ; SerialCommand_WriteProtocol |
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| 430 | ; |
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| 431 | ; Parameters: |
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| 432 | ; ES:DI: Ptr to buffer |
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| 433 | ; BL: Words to write (1-255, or 0=256) |
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| 434 | ; BP/SI: Initialized for Checksum (-1 in each) |
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| 435 | ; DX: I/O Port |
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| 436 | ; Returns: |
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| 437 | ; BP/SI: Checksum for written bytes, compared against ACK from server in .readLoop |
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| 438 | ; Corrupts registers: |
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| 439 | ; AX, BX, CX, DI |
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| 440 | ;-------------------------------------------------------------------- |
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[150] | 441 | ALIGN JUMP_ALIGN |
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[179] | 442 | SerialCommand_WriteProtocol: |
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| 443 | mov bh,20h |
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| 444 | |
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| 445 | .writeLoop: |
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| 446 | test bh,1 |
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| 447 | jnz SerialCommand_WaitAndPoll_Done |
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| 448 | |
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| 449 | mov ax,[es:di] ; fetch next word |
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| 450 | inc di |
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| 451 | inc di |
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| 452 | |
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| 453 | add bp,ax ; update checksum |
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| 454 | adc bp,0 |
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| 455 | add si,bp |
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| 456 | adc si,0 |
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[150] | 457 | |
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[179] | 458 | .writeLoopChecksum: |
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| 459 | call SerialCommand_WaitAndPoll_Init |
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| 460 | |
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| 461 | out dx,al ; output first byte |
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[150] | 462 | |
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[179] | 463 | call SerialCommand_WaitAndPoll |
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| 464 | |
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| 465 | mov al,ah ; output second byte |
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| 466 | out dx,al |
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| 467 | |
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| 468 | dec bl |
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| 469 | jnz .writeLoop |
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| 470 | |
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| 471 | inc bh |
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| 472 | |
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| 473 | mov ax,bp ; merge checksum for possible write (last loop) |
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| 474 | xor ax,si |
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| 475 | |
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| 476 | jmp .writeLoopChecksum |
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| 477 | |
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| 478 | |
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| 479 | ; To return the port number and baud rate to the FinalizeDPT routine, we |
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| 480 | ; stuff the value in a "vendor" specific area of the 512-byte IdentifyDevice |
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| 481 | ; sector. |
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| 482 | ; |
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| 483 | SerialCommand_IdentifyDevice_PackedPortAndBaud equ (157*2) |
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| 484 | |
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| 485 | ;-------------------------------------------------------------------- |
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| 486 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
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| 487 | ; Parameters: |
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| 488 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 489 | ; DS: Segment to RAMVARS |
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| 490 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
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| 491 | ; CS:BP: Ptr to IDEVARS |
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| 492 | ; Returns: |
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| 493 | ; AH: INT 13h Error Code |
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| 494 | ; CF: Cleared if success, Set if error |
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| 495 | ; Corrupts registers: |
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| 496 | ; AL, BL, CX, DX, SI, DI, ES |
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| 497 | ;-------------------------------------------------------------------- |
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| 498 | ALIGN JUMP_ALIGN |
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| 499 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH: |
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| 500 | |
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| 501 | mov dx,[cs:bp+IDEVARS.wPortCtrl] |
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| 502 | inc dx |
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| 503 | dec dx |
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| 504 | jz SerialCommand_AutoSerial |
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| 505 | |
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| 506 | ; fall-through |
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| 507 | SerialCommand_IdentifyDeviceInDL_DriveInBH: |
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| 508 | |
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| 509 | push bp ; setup fake IDEREGS_AND_INTPACK |
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| 510 | |
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| 511 | push dx |
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| 512 | |
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| 513 | mov cl,1 ; 1 sector to move |
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| 514 | push cx |
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| 515 | |
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| 516 | mov bl,0a0h ; protocol command to ah and onto stack with bh |
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| 517 | mov ah,bl |
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| 518 | |
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| 519 | push bx |
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| 520 | |
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| 521 | mov bp,sp |
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| 522 | |
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| 523 | call SerialCommand_OutputWithParameters_DeviceInDL |
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| 524 | |
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| 525 | pop bx |
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| 526 | |
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| 527 | pop cx |
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| 528 | pop dx |
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| 529 | |
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| 530 | pop bp |
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| 531 | |
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| 532 | ; place packed port/baud in vendor area of packet, read by FinalizeDPT |
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| 533 | mov byte [es:si+SerialCommand_IdentifyDevice_PackedPortAndBaud], dl |
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| 534 | |
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| 535 | ret |
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| 536 | |
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| 537 | ;---------------------------------------------------------------------- |
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| 538 | ; |
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| 539 | ; SerialCommand_AutoSerial |
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| 540 | ; |
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| 541 | ; When the SerialAuto IDEVARS entry is used, scans the COM ports on the machine for a possible serial connection. |
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| 542 | ; |
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| 543 | |
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| 544 | SerialCommand_ScanPortAddresses: db 0b8h, 0f8h, 0bch, 0bah, 0fah, 0beh, 0feh, 0 |
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| 545 | ; Corresponds to I/O port: 3f8, 2f8, 3e8, 2e8, 2f0, 3e0, 2e0, 260, 368, 268, 360, 270 |
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| 546 | ; COM Assignments: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 |
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| 547 | |
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| 548 | ALIGN JUMP_ALIGN |
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| 549 | SerialCommand_AutoSerial: |
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| 550 | mov di,SerialCommand_ScanPortAddresses-1 |
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| 551 | |
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| 552 | .nextPort: |
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| 553 | inc di ; load next port address |
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| 554 | mov dl,[cs:di] |
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| 555 | |
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| 556 | mov dh,0 ; shift from one byte to two |
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| 557 | shl dx,1 |
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| 558 | shl dx,1 |
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| 559 | jz .exitNotFound |
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| 560 | |
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| 561 | ; |
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| 562 | ; Test for COM port presence, write to and read from registers |
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| 563 | ; |
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| 564 | push dx |
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| 565 | add dl,SerialCommand_UART_lineControl |
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| 566 | mov al, 09ah |
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| 567 | out dx, al |
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| 568 | in al, dx |
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| 569 | pop dx |
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| 570 | cmp al, 09ah |
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| 571 | jnz .nextPort |
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| 572 | |
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| 573 | mov al, 0ch |
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| 574 | out dx, al |
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| 575 | in al, dx |
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| 576 | cmp al, 0ch |
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| 577 | jnz .nextPort |
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| 578 | |
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| 579 | ; |
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| 580 | ; Pack into dl, baud rate starts at 0 |
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| 581 | ; |
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| 582 | add dx,-(SerialCommand_PackedPortAndBaud_StartingPort) |
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| 583 | shr dx,1 |
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| 584 | |
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| 585 | jmp .testFirstBaud |
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| 586 | |
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| 587 | ; |
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| 588 | ; Walk through 4 possible baud rates |
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| 589 | ; |
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| 590 | .nextBaud: |
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| 591 | inc dx |
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| 592 | test dl,3 |
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| 593 | jz .nextPort |
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| 594 | |
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| 595 | .testFirstBaud: |
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| 596 | call SerialCommand_IdentifyDeviceInDL_DriveInBH |
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| 597 | jc .nextBaud |
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| 598 | |
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| 599 | ret |
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| 600 | |
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| 601 | .exitNotFound: |
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| 602 | mov ah,1 |
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| 603 | stc |
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| 604 | |
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| 605 | ret |
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