[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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[181] | 12 | |
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[179] | 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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[181] | 17 | ; Values for UART_divisorLow: |
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[179] | 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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[181] | 25 | SerialCommand_UART_interruptEnable EQU 1 |
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[179] | 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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[181] | 33 | |
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[179] | 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_Protocol_Write EQU 3 |
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| 43 | SerialCommand_Protocol_Read EQU 2 |
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| 44 | SerialCommand_Protocol_Inquire EQU 0 |
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| 45 | SerialCommand_Protocol_Header EQU 0a0h |
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[181] | 46 | |
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[150] | 47 | ;-------------------------------------------------------------------- |
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[179] | 48 | ; SerialCommand_OutputWithParameters |
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[150] | 49 | ; Parameters: |
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[179] | 50 | ; BH: Non-zero if 48-bit addressing used |
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| 51 | ; (ignored at present as 48-bit addressing is not supported) |
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| 52 | ; BL: IDE Status Register bit to poll after command |
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| 53 | ; (ignored at present, since there is no IDE status register to poll) |
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| 54 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 55 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 56 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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[150] | 57 | ; Returns: |
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| 58 | ; AH: INT 13h Error Code |
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| 59 | ; CF: Cleared if success, Set if error |
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| 60 | ; Corrupts registers: |
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[179] | 61 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[150] | 62 | ;-------------------------------------------------------------------- |
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| 63 | ALIGN JUMP_ALIGN |
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[179] | 64 | SerialCommand_OutputWithParameters: |
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[181] | 65 | |
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[179] | 66 | mov ah,(SerialCommand_Protocol_Header | SerialCommand_Protocol_Read) |
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[181] | 67 | |
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[179] | 68 | mov al,[bp+IDEPACK.bCommand] |
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[150] | 69 | |
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[179] | 70 | cmp al,20h ; Read Sectors IDE command |
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| 71 | jz .readOrWrite |
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| 72 | inc ah ; now SerialCommand_Protocol_Write |
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| 73 | cmp al,30h ; Write Sectors IDE command |
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| 74 | jz .readOrWrite |
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[181] | 75 | |
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[179] | 76 | ; all other commands return success |
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| 77 | ; including function 0ech which should return drive information, this is handled with the identify functions |
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| 78 | xor ah,ah ; also clears carry |
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| 79 | ret |
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[181] | 80 | |
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| 81 | .readOrWrite: |
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[179] | 82 | mov [bp+IDEPACK.bFeatures],ah ; store protocol command |
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[181] | 83 | |
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| 84 | mov dl, byte [di+DPT.bSerialPortAndBaud] |
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| 85 | |
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[179] | 86 | ; fall-through |
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[150] | 87 | |
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| 88 | ;-------------------------------------------------------------------- |
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[179] | 89 | ; SerialCommand_OutputWithParameters_DeviceInDL |
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[150] | 90 | ; Parameters: |
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[181] | 91 | ; AH: Protocol Command |
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[179] | 92 | ; DL: Packed I/O port and baud rate |
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[150] | 93 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 94 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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| 95 | ; Returns: |
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| 96 | ; AH: INT 13h Error Code |
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| 97 | ; CF: Cleared if success, Set if error |
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| 98 | ; Corrupts registers: |
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| 99 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[181] | 100 | ;-------------------------------------------------------------------- |
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[179] | 101 | SerialCommand_OutputWithParameters_DeviceInDL: |
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[181] | 102 | |
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[179] | 103 | push si |
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| 104 | push di |
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| 105 | push bp |
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| 106 | push es |
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| 107 | |
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[181] | 108 | ; |
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[179] | 109 | ; Unpack I/O port and baud from DPT |
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| 110 | ; Port to DX more or less for the remainder of the routine |
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| 111 | ; Baud in CH until UART initialization is complete |
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| 112 | ; |
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| 113 | mov cl, dl |
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[181] | 114 | |
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[199] | 115 | and cl, DEVICE_SERIAL_PACKEDPORTANDBAUD_BAUDMASK |
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[179] | 116 | shl cl, 1 |
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| 117 | mov ch, SerialCommand_UART_divisorLow_startingBaud |
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| 118 | shr ch, cl |
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| 119 | adc ch, 0 |
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| 120 | |
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[199] | 121 | and dl, DEVICE_SERIAL_PACKEDPORTANDBAUD_PORTMASK |
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[181] | 122 | mov dh, 0 |
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[196] | 123 | shl dx, 1 ; port offset already x4, needs one more shift to be x8 |
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[199] | 124 | add dx, DEVICE_SERIAL_PACKEDPORTANDBAUD_STARTINGPORT |
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[179] | 125 | |
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| 126 | ; |
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| 127 | ; Buffer is referenced through ES:DI throughout, since we need to store faster than we read |
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[181] | 128 | ; |
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[179] | 129 | mov di,si |
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| 130 | |
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| 131 | mov al,[bp+IDEPACK.bSectorCount] |
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| 132 | |
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| 133 | ; |
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| 134 | ; Command byte and sector count live at the top of the stack, pop/push are used to access |
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[181] | 135 | ; |
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[179] | 136 | push ax |
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| 137 | |
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[181] | 138 | ; cld ; Shouldn't be needed. DF has already been cleared (line 24, Int13h.asm) |
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| 139 | |
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[179] | 140 | ;---------------------------------------------------------------------- |
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| 141 | ; |
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| 142 | ; Initialize UART |
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| 143 | ; |
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[181] | 144 | ; We do this each time since DOS (at boot) or another program may have |
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[179] | 145 | ; decided to reprogram the UART |
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| 146 | ; |
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| 147 | push dx |
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[181] | 148 | |
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[179] | 149 | mov al,83h |
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| 150 | add dl,SerialCommand_UART_lineControl |
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| 151 | out dx,al |
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| 152 | |
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| 153 | mov al,ch |
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| 154 | pop dx ; divisor low |
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| 155 | out dx,al |
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| 156 | |
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| 157 | xor ax,ax |
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| 158 | inc dx ; divisor high |
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| 159 | push dx |
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| 160 | out dx,al |
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| 161 | |
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| 162 | mov al,047h |
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| 163 | inc dx ; fifo |
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[181] | 164 | out dx,al |
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[179] | 165 | |
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| 166 | mov al,03h |
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| 167 | inc dx ; linecontrol |
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| 168 | out dx,al |
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| 169 | |
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| 170 | mov al,0bh |
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| 171 | inc dx ; modemcontrol |
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| 172 | out dx,al |
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| 173 | |
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| 174 | pop dx ; base, interrupts disabled |
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| 175 | xor ax,ax |
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| 176 | out dx,al |
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| 177 | dec dx |
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| 178 | |
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[207] | 179 | ; |
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| 180 | ; Start off with a normalized buffer pointer |
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| 181 | ; |
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| 182 | call Registers_NormalizeESDI |
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| 183 | |
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[179] | 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 | push es ; save off real buffer location |
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| 191 | push di |
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[181] | 192 | |
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| 193 | mov di,bp ; point to IDEREGS for command dispatch; |
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[179] | 194 | push ss |
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| 195 | pop es |
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| 196 | |
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| 197 | xor si,si ; initialize checksum for write |
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[181] | 198 | dec si |
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[179] | 199 | mov bp,si |
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| 200 | |
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| 201 | mov bl,03h ; writing 3 words |
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[181] | 202 | |
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[179] | 203 | call SerialCommand_WriteProtocol |
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| 204 | |
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| 205 | pop di ; restore real buffer location |
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| 206 | pop es |
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| 207 | |
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| 208 | pop ax ; load command byte (done before call to .nextSector on subsequent iterations) |
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| 209 | push ax |
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| 210 | |
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| 211 | ; |
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| 212 | ; Top of the read/write loop, one iteration per sector |
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[181] | 213 | ; |
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[179] | 214 | .nextSector: |
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| 215 | xor si,si ; initialize checksum for read or write |
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| 216 | dec si |
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| 217 | mov bp,si |
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| 218 | |
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| 219 | mov bx,0100h |
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[181] | 220 | |
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[179] | 221 | shr ah,1 ; command byte, are we doing a write? |
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| 222 | jnc .readSector |
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| 223 | call SerialCommand_WriteProtocol |
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[181] | 224 | |
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[179] | 225 | xor bx,bx |
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| 226 | |
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| 227 | .readSector: |
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| 228 | mov cx,bx |
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| 229 | inc cx |
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[181] | 230 | |
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[179] | 231 | mov bl,dl ; setup bl with proper values for read loop (bh comes later) |
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| 232 | |
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| 233 | ;---------------------------------------------------------------------- |
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| 234 | ; |
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| 235 | ; Timeout |
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| 236 | ; |
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| 237 | ; During read, we first poll in a tight loop, interrupts off, for the next character to come in |
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| 238 | ; If that loop completes, then we assume there is a long delay involved, turn interrupts back on |
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| 239 | ; and wait for a given number of timer ticks to pass. |
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| 240 | ; |
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| 241 | ; 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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| 242 | ; |
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| 243 | .readTimeout: |
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| 244 | push cx |
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| 245 | xor cx,cx |
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[181] | 246 | .readTimeoutLoop: |
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[179] | 247 | push dx |
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| 248 | or dl,SerialCommand_UART_lineStatus |
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| 249 | in al,dx |
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| 250 | pop dx |
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| 251 | shr al,1 |
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| 252 | jc .readTimeoutComplete |
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| 253 | loop .readTimeoutLoop |
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| 254 | sti |
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| 255 | mov bh,1 |
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| 256 | call SerialCommand_WaitAndPoll_Init |
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[181] | 257 | cli |
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[179] | 258 | .readTimeoutComplete: |
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| 259 | mov bh,bl |
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| 260 | or bh,SerialCommand_UART_lineStatus |
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[181] | 261 | |
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[179] | 262 | pop cx |
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| 263 | test dl,1 |
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| 264 | jz .readByte1Ready |
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| 265 | jmp .readByte2Ready |
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| 266 | |
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| 267 | ;---------------------------------------------------------------------------- |
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| 268 | ; |
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| 269 | ; Read Block (without interrupts, used when there is a FIFO, high speed) |
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| 270 | ; |
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[181] | 271 | ; NOTE: This loop is very time sensitive. Literally, another instruction |
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[179] | 272 | ; cannot be inserted into this loop without us falling behind at high |
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[181] | 273 | ; speed (460.8K baud) on a 4.77Mhz 8088, making it hard to receive |
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[179] | 274 | ; a full 512 byte block. |
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| 275 | ; |
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[181] | 276 | .readLoop: |
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| 277 | stosw ; store word in caller's data buffer |
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| 278 | |
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[179] | 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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[181] | 284 | mov dl,bh |
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| 285 | in al,dx |
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[179] | 286 | shr al,1 ; data ready (byte 1)? |
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[181] | 287 | mov dl,bl ; get ready to read data |
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[179] | 288 | jnc .readTimeout ; nope not ready, update timeouts |
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[181] | 289 | |
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| 290 | ; |
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[179] | 291 | ; Entry point after initial timeout. We enter here so that the checksum word |
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| 292 | ; is not stored (and is left in AX after the loop is complete). |
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[181] | 293 | ; |
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| 294 | .readByte1Ready: |
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[179] | 295 | in al, dx ; read data byte 1 |
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| 296 | |
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| 297 | mov ah, al ; store byte in ah for now |
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[181] | 298 | |
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[179] | 299 | ; |
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[181] | 300 | ; note the placement of this reset of dl to bh, and that it is |
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| 301 | ; before the return, which is assymetric with where this is done |
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| 302 | ; above for byte 1. The value of dl is used by the timeout routine |
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| 303 | ; to know which byte to return to (.read_byte1_ready or |
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[179] | 304 | ; .read_byte2_ready) |
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| 305 | ; |
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[181] | 306 | mov dl,bh |
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| 307 | |
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[179] | 308 | in al,dx |
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| 309 | shr al,1 ; data ready (byte 2)? |
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| 310 | jnc .readTimeout |
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[181] | 311 | .readByte2Ready: |
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| 312 | mov dl,bl |
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[179] | 313 | in al, dx ; read data byte 2 |
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| 314 | |
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| 315 | xchg al, ah ; ah was holding byte 1, reverse byte order |
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[181] | 316 | |
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[179] | 317 | loop .readLoop |
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| 318 | |
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[181] | 319 | sti ; interrupts back on ASAP, if we turned them off |
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| 320 | |
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[179] | 321 | ; |
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| 322 | ; Compare checksums |
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[181] | 323 | ; |
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[179] | 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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[207] | 328 | ; |
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| 329 | ; Normalize buffer pointer for next go round, if needed |
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| 330 | ; |
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| 331 | test di,di |
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| 332 | jns .clearBuffer |
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| 333 | call Registers_NormalizeESDI |
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[181] | 334 | |
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[179] | 335 | ;---------------------------------------------------------------------- |
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[181] | 336 | ; |
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[179] | 337 | ; Clear read buffer |
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| 338 | ; |
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| 339 | ; In case there are extra characters or an error in the FIFO, clear it out. |
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[181] | 340 | ; In theory the initialization of the UART registers above should have |
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[179] | 341 | ; taken care of this, but I have seen cases where this is not true. |
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| 342 | ; |
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[207] | 343 | |
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[179] | 344 | .clearBuffer: |
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[181] | 345 | mov dl,bh |
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[179] | 346 | in al,dx |
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[181] | 347 | mov dl,bl |
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[179] | 348 | test al,08fh |
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| 349 | jz .clearBufferComplete |
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| 350 | shr al,1 |
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[181] | 351 | in al,dx |
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[179] | 352 | jc .clearBuffer ; note CF from shr above |
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| 353 | jmp SerialCommand_OutputWithParameters_Error |
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[181] | 354 | |
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| 355 | .clearBufferComplete: |
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[207] | 356 | |
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[179] | 357 | pop ax ; sector count and command byte |
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| 358 | dec al ; decrememnt sector count |
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| 359 | push ax ; save |
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| 360 | jz SerialCommand_OutputWithParameters_ReturnCodeInALCF ; CF clear from .clearBuffer test above |
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[181] | 361 | |
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[179] | 362 | cli ; interrupts back off for ACK byte to host |
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| 363 | ; (host could start sending data immediately) |
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| 364 | out dx,al ; ACK with next sector number |
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[181] | 365 | |
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[179] | 366 | jmp .nextSector ; all is well, time for next sector |
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| 367 | |
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| 368 | ;--------------------------------------------------------------------------- |
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| 369 | ; |
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| 370 | ; Cleanup, error reporting, and exit |
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| 371 | ; |
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[181] | 372 | |
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| 373 | ; |
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[179] | 374 | ; Used in situations where a call is underway, such as with SerialCommand_WaitAndPoll |
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[181] | 375 | ; |
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[179] | 376 | SerialCommand_OutputWithParameters_ErrorAndPop2Words: |
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| 377 | pop ax |
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| 378 | pop ax |
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| 379 | |
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[181] | 380 | SerialCommand_OutputWithParameters_Error: |
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| 381 | stc |
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[179] | 382 | mov al,1 |
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| 383 | |
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[181] | 384 | SerialCommand_OutputWithParameters_ReturnCodeInALCF: |
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| 385 | sti |
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[179] | 386 | mov ah,al |
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| 387 | |
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| 388 | pop bp ; recover ax from stack, throw away |
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| 389 | |
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| 390 | pop es |
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| 391 | pop bp |
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| 392 | pop di |
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| 393 | pop si |
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| 394 | |
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| 395 | ret |
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| 396 | |
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[150] | 397 | ;-------------------------------------------------------------------- |
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[179] | 398 | ; SerialCommand_WaitAndPoll |
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| 399 | ; |
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| 400 | ; Parameters: |
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| 401 | ; BH: UART_LineStatus bit to test (20h for write, or 1h for read) |
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| 402 | ; DX: Port address (OK if already incremented to UART_lineStatus) |
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| 403 | ; Stack: 2 words on the stack below the command/count word |
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| 404 | ; Returns: |
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| 405 | ; Returns when desired UART_LineStatus bit is cleared |
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| 406 | ; Jumps directly to error exit if timeout elapses (and cleans up stack) |
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[181] | 407 | ; Corrupts registers: |
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[179] | 408 | ; CX, flags |
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| 409 | ;-------------------------------------------------------------------- |
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| 410 | |
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| 411 | SerialCommand_WaitAndPoll_SoftDelayTicks EQU 20 |
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| 412 | |
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[181] | 413 | ALIGN JUMP_ALIGN |
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[179] | 414 | SerialCommand_WaitAndPoll_Init: |
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| 415 | mov cl,SerialCommand_WaitAndPoll_SoftDelayTicks |
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| 416 | call Timer_InitializeTimeoutWithTicksInCL |
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| 417 | ; fall-through |
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[181] | 418 | |
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[179] | 419 | SerialCommand_WaitAndPoll: |
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| 420 | call Timer_SetCFifTimeout |
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| 421 | jc SerialCommand_OutputWithParameters_ErrorAndPop2Words |
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| 422 | push dx |
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| 423 | push ax |
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| 424 | or dl,SerialCommand_UART_lineStatus |
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| 425 | in al,dx |
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| 426 | test al,bh |
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| 427 | pop ax |
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| 428 | pop dx |
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| 429 | jz SerialCommand_WaitAndPoll |
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| 430 | ; fall-through |
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[181] | 431 | |
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| 432 | SerialCommand_WaitAndPoll_Done: |
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[179] | 433 | ret |
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| 434 | |
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| 435 | ;-------------------------------------------------------------------- |
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| 436 | ; SerialCommand_WriteProtocol |
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| 437 | ; |
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| 438 | ; Parameters: |
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| 439 | ; ES:DI: Ptr to buffer |
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| 440 | ; BL: Words to write (1-255, or 0=256) |
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| 441 | ; BP/SI: Initialized for Checksum (-1 in each) |
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| 442 | ; DX: I/O Port |
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| 443 | ; Returns: |
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| 444 | ; BP/SI: Checksum for written bytes, compared against ACK from server in .readLoop |
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| 445 | ; Corrupts registers: |
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| 446 | ; AX, BX, CX, DI |
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| 447 | ;-------------------------------------------------------------------- |
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[150] | 448 | ALIGN JUMP_ALIGN |
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[179] | 449 | SerialCommand_WriteProtocol: |
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| 450 | mov bh,20h |
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[181] | 451 | |
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[179] | 452 | .writeLoop: |
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| 453 | test bh,1 |
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| 454 | jnz SerialCommand_WaitAndPoll_Done |
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[181] | 455 | |
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[179] | 456 | mov ax,[es:di] ; fetch next word |
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| 457 | inc di |
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| 458 | inc di |
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[181] | 459 | |
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[179] | 460 | add bp,ax ; update checksum |
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| 461 | adc bp,0 |
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| 462 | add si,bp |
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| 463 | adc si,0 |
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[150] | 464 | |
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[179] | 465 | .writeLoopChecksum: |
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| 466 | call SerialCommand_WaitAndPoll_Init |
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[181] | 467 | |
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[179] | 468 | out dx,al ; output first byte |
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[150] | 469 | |
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[179] | 470 | call SerialCommand_WaitAndPoll |
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[181] | 471 | |
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[179] | 472 | mov al,ah ; output second byte |
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| 473 | out dx,al |
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| 474 | |
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| 475 | dec bl |
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| 476 | jnz .writeLoop |
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[181] | 477 | |
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[179] | 478 | inc bh |
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[181] | 479 | |
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[179] | 480 | mov ax,bp ; merge checksum for possible write (last loop) |
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[181] | 481 | xor ax,si |
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| 482 | |
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[179] | 483 | jmp .writeLoopChecksum |
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| 484 | |
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| 485 | |
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| 486 | ;-------------------------------------------------------------------- |
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| 487 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
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| 488 | ; Parameters: |
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| 489 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 490 | ; DS: Segment to RAMVARS |
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| 491 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
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| 492 | ; CS:BP: Ptr to IDEVARS |
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| 493 | ; Returns: |
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| 494 | ; AH: INT 13h Error Code |
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[203] | 495 | ; NOTE: Not set (or checked) during drive detection |
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[179] | 496 | ; CF: Cleared if success, Set if error |
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| 497 | ; Corrupts registers: |
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| 498 | ; AL, BL, CX, DX, SI, DI, ES |
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| 499 | ;-------------------------------------------------------------------- |
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| 500 | ALIGN JUMP_ALIGN |
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| 501 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH: |
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[203] | 502 | ; |
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| 503 | ; 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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| 504 | ; from the looking for a master. This is particuarly true when doing a COM port scan, as we will end up running |
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| 505 | ; through all the COM ports and baud rates a second time. |
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| 506 | ; |
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| 507 | ; 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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| 508 | ; |
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| 509 | ; The decision tree: |
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| 510 | ; |
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| 511 | ; Master: |
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| 512 | ; bSerialPackedPortAndBaud Non-Zero: -> Continue with bSerialPackedAndBaud (1) |
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| 513 | ; bSerialPackedPortAndBaud Zero: |
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| 514 | ; bLastSerial Zero: -> Scan (2) |
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| 515 | ; bLastSerial Non-Zero: -> Continue with bLastSerial (3) |
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| 516 | ; |
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| 517 | ; Slave: |
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| 518 | ; bSerialPackedPortAndBaud Non-Zero: |
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| 519 | ; bLastSerial Zero: -> Error - Not Found (4) |
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| 520 | ; bLastSerial Non-Zero: -> Continue with bSerialPackedAndBaud (5) |
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| 521 | ; bSerialPackedPortAndBaud Zero: |
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| 522 | ; bLastSerial Zero: -> Error - Not Found (4) |
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| 523 | ; bLastSerial Non-Zero: -> Continue with bLastSerial (6) |
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| 524 | ; |
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| 525 | ; (1) This was a port/baud that was explicilty set with the configurator. In the drive detection case, as this |
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| 526 | ; is the Master, we are checking out a new controller, and so don't care about the value of bLastSerial. |
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| 527 | ; 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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| 528 | ; (2) We are using the special .ideVarsSerialAuto strucutre. During drive detection, we would only be here |
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| 529 | ; if bLastSerial is zero (since we only scan if no explicit drives are set), so we go off to scan. |
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| 530 | ; (3) We are using the special .ideVarsSerialAuto strucutre. We won't get here during drive detection, but |
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| 531 | ; 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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| 532 | ; in use, and so bLastSerial will reflect the port/baud setting for the scanned COM drives. |
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| 533 | ; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time, |
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| 534 | ; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we |
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| 535 | ; 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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| 536 | ; we will do the slave scan, which isn't harmful, it just wates time. But the most common case (by a wide |
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| 537 | ; margin) will be just one serial controller. |
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| 538 | ; (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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| 539 | ; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud |
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| 540 | ; to make sure we get the proper drive. |
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| 541 | ; (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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| 542 | ; if no serial drive was explicitly set by the user in the configurator or that drive had not been found. |
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| 543 | ; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the |
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| 544 | ; master scan. |
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| 545 | ; |
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| 546 | mov dl,[cs:bp+IDEVARS.bSerialPackedPortAndBaud] |
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| 547 | mov al, byte [RAMVARS.xlateVars+XLATEVARS.bLastSerial] |
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| 548 | |
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| 549 | test bh, FLG_DRVNHEAD_DRV |
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| 550 | jz .master |
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[179] | 551 | |
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[203] | 552 | test al,al ; Take care of the case that is different between master and slave. |
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| 553 | jz .error ; Because we do this here, the jz after the "or" below will not be taken |
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| 554 | |
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| 555 | ; fall-through |
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| 556 | .master: |
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[196] | 557 | test dl,dl |
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[203] | 558 | jnz .identifyDeviceInDL |
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[179] | 559 | |
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[203] | 560 | or dl,al ; Move bLast into position in dl, as well as test for zero |
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| 561 | jz .scanSerial |
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[199] | 562 | |
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[179] | 563 | ; fall-through |
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[203] | 564 | .identifyDeviceInDL: |
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[179] | 565 | |
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| 566 | push bp ; setup fake IDEREGS_AND_INTPACK |
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| 567 | |
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| 568 | push dx |
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| 569 | |
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| 570 | mov cl,1 ; 1 sector to move |
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| 571 | push cx |
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| 572 | |
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| 573 | mov bl,0a0h ; protocol command to ah and onto stack with bh |
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| 574 | mov ah,bl |
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[181] | 575 | |
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[179] | 576 | push bx |
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| 577 | |
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| 578 | mov bp,sp |
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| 579 | call SerialCommand_OutputWithParameters_DeviceInDL |
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| 580 | |
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| 581 | pop bx |
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[181] | 582 | |
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| 583 | pop cx |
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[179] | 584 | pop dx |
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| 585 | |
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| 586 | pop bp |
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[203] | 587 | ; |
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| 588 | ; place packed port/baud in RAMVARS, read by FinalizeDPT and DetectDrives |
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| 589 | ; |
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| 590 | ; Note that this will be set during an int13h/25h call as well. Which is OK since it is only used (at the |
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| 591 | ; top of this routine) for drives found during a COM scan, and we only COM scan if there were no other |
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| 592 | ; COM drives found. So we will only reaffirm the port/baud for the one COM port/baud that has a drive. |
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| 593 | ; |
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| 594 | jc .notFound ; only store bLastSerial if success |
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| 595 | mov byte [RAMVARS.xlateVars+XLATEVARS.bLastSerial], dl |
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[179] | 596 | |
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[203] | 597 | .notFound: |
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[179] | 598 | ret |
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| 599 | |
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| 600 | ;---------------------------------------------------------------------- |
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| 601 | ; |
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| 602 | ; SerialCommand_AutoSerial |
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| 603 | ; |
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| 604 | ; When the SerialAuto IDEVARS entry is used, scans the COM ports on the machine for a possible serial connection. |
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[181] | 605 | ; |
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| 606 | |
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[203] | 607 | .scanPortAddresses: db DEVICE_SERIAL_COM7 >> 2 |
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| 608 | db DEVICE_SERIAL_COM6 >> 2 |
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| 609 | db DEVICE_SERIAL_COM5 >> 2 |
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| 610 | db DEVICE_SERIAL_COM4 >> 2 |
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| 611 | db DEVICE_SERIAL_COM3 >> 2 |
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| 612 | db DEVICE_SERIAL_COM2 >> 2 |
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| 613 | db DEVICE_SERIAL_COM1 >> 2 |
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| 614 | db 0 |
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[179] | 615 | |
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[181] | 616 | ALIGN JUMP_ALIGN |
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[203] | 617 | .scanSerial: |
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| 618 | mov di,.scanPortAddresses-1 |
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[181] | 619 | |
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[179] | 620 | .nextPort: |
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| 621 | inc di ; load next port address |
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| 622 | mov dl,[cs:di] |
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[181] | 623 | |
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[179] | 624 | mov dh,0 ; shift from one byte to two |
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[181] | 625 | eSHL_IM dx, 2 |
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[203] | 626 | jz .error |
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[179] | 627 | |
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| 628 | ; |
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| 629 | ; Test for COM port presence, write to and read from registers |
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[181] | 630 | ; |
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| 631 | push dx |
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[179] | 632 | add dl,SerialCommand_UART_lineControl |
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| 633 | mov al, 09ah |
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| 634 | out dx, al |
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| 635 | in al, dx |
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| 636 | pop dx |
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| 637 | cmp al, 09ah |
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[181] | 638 | jnz .nextPort |
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[179] | 639 | |
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| 640 | mov al, 0ch |
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| 641 | out dx, al |
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| 642 | in al, dx |
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| 643 | cmp al, 0ch |
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| 644 | jnz .nextPort |
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| 645 | |
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| 646 | ; |
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| 647 | ; Pack into dl, baud rate starts at 0 |
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[181] | 648 | ; |
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[199] | 649 | add dx,-(DEVICE_SERIAL_PACKEDPORTANDBAUD_STARTINGPORT) |
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| 650 | shr dx,1 ; dh is zero at this point, and will be sent to the server, |
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| 651 | ; so we know this is an auto detect |
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[181] | 652 | |
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[179] | 653 | jmp .testFirstBaud |
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| 654 | |
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| 655 | ; |
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| 656 | ; Walk through 4 possible baud rates |
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[181] | 657 | ; |
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| 658 | .nextBaud: |
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[179] | 659 | inc dx |
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| 660 | test dl,3 |
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| 661 | jz .nextPort |
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[181] | 662 | |
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| 663 | .testFirstBaud: |
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[203] | 664 | call .identifyDeviceInDL |
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[179] | 665 | jc .nextBaud |
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| 666 | |
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| 667 | ret |
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[181] | 668 | |
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[203] | 669 | .error: |
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[181] | 670 | stc |
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[203] | 671 | ; mov ah,1 ; setting the error code is unnecessary as this path can only be taken during |
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| 672 | ; drive detection, and drive detection works off CF and does not check AH |
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| 673 | ret |
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[179] | 674 | |
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[203] | 675 | |
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