[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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[216] | 16 | |
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| 17 | ; |
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[181] | 18 | ; Values for UART_divisorLow: |
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[233] | 19 | ; 60h = 1200, 30h = 2400, 18h = 4800, 0ch = 9600, 6 = 19200, 4 = 28800, 3 = 38400, 2 = 57600, 1 = 115200 |
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[216] | 20 | ; |
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| 21 | SerialCommand_UART_divisorLow EQU 0 |
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[179] | 22 | |
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[216] | 23 | ; |
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| 24 | ; UART_divisorHigh is zero for all speeds including and above 1200 baud (which is all we do) |
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| 25 | ; |
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[179] | 26 | SerialCommand_UART_divisorHigh EQU 1 |
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| 27 | |
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| 28 | SerialCommand_UART_interruptIdent EQU 2 |
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| 29 | SerialCommand_UART_FIFOControl EQU 2 |
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| 30 | |
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| 31 | SerialCommand_UART_lineControl EQU 3 |
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[181] | 32 | |
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[179] | 33 | SerialCommand_UART_modemControl EQU 4 |
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| 34 | |
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| 35 | SerialCommand_UART_lineStatus EQU 5 |
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| 36 | |
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| 37 | SerialCommand_UART_modemStatus EQU 6 |
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| 38 | |
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| 39 | SerialCommand_UART_scratch EQU 7 |
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| 40 | |
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| 41 | SerialCommand_Protocol_Write EQU 3 |
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| 42 | SerialCommand_Protocol_Read EQU 2 |
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| 43 | SerialCommand_Protocol_Inquire EQU 0 |
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| 44 | SerialCommand_Protocol_Header EQU 0a0h |
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[181] | 45 | |
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[150] | 46 | ;-------------------------------------------------------------------- |
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[179] | 47 | ; SerialCommand_OutputWithParameters |
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[150] | 48 | ; Parameters: |
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[179] | 49 | ; BH: Non-zero if 48-bit addressing used |
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| 50 | ; (ignored at present as 48-bit addressing is not supported) |
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| 51 | ; BL: IDE Status Register bit to poll after command |
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| 52 | ; (ignored at present, since there is no IDE status register to poll) |
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| 53 | ; ES:SI: Ptr to buffer (for data transfer commands) |
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| 54 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 55 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
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[150] | 56 | ; Returns: |
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| 57 | ; AH: INT 13h Error Code |
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| 58 | ; CF: Cleared if success, Set if error |
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| 59 | ; Corrupts registers: |
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[179] | 60 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
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[150] | 61 | ;-------------------------------------------------------------------- |
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| 62 | ALIGN JUMP_ALIGN |
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[179] | 63 | SerialCommand_OutputWithParameters: |
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[181] | 64 | |
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[179] | 65 | mov ah,(SerialCommand_Protocol_Header | SerialCommand_Protocol_Read) |
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[181] | 66 | |
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[179] | 67 | mov al,[bp+IDEPACK.bCommand] |
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[150] | 68 | |
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[179] | 69 | cmp al,20h ; Read Sectors IDE command |
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| 70 | jz .readOrWrite |
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| 71 | inc ah ; now SerialCommand_Protocol_Write |
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| 72 | cmp al,30h ; Write Sectors IDE command |
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| 73 | jz .readOrWrite |
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[181] | 74 | |
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[179] | 75 | ; all other commands return success |
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| 76 | ; including function 0ech which should return drive information, this is handled with the identify functions |
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[216] | 77 | ; |
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[179] | 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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[233] | 84 | mov dx, [di+DPT_SERIAL.wSerialPortAndBaud] |
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[181] | 85 | |
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[179] | 86 | ; fall-through |
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[150] | 87 | |
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| 88 | ;-------------------------------------------------------------------- |
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[233] | 89 | ; SerialCommand_OutputWithParameters_DeviceInDX |
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[150] | 90 | ; Parameters: |
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[181] | 91 | ; AH: Protocol Command |
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[233] | 92 | ; DX: 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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[233] | 101 | SerialCommand_OutputWithParameters_DeviceInDX: |
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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 | |
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[181] | 107 | ; |
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[179] | 108 | ; Unpack I/O port and baud from DPT |
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[233] | 109 | ; Port to DX for the remainder of the routine (+/- different register offsets) |
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[179] | 110 | ; Baud in CH until UART initialization is complete |
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| 111 | ; |
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[233] | 112 | mov ch,dh |
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| 113 | xor dh,dh |
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| 114 | eSHL_IM dx, 2 ; shift from one byte to two |
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| 115 | |
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[179] | 116 | mov al,[bp+IDEPACK.bSectorCount] |
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| 117 | |
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| 118 | ; |
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| 119 | ; Command byte and sector count live at the top of the stack, pop/push are used to access |
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[181] | 120 | ; |
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[179] | 121 | push ax |
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| 122 | |
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[216] | 123 | %if 0 |
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| 124 | cld ; Shouldn't be needed. DF has already been cleared (line 24, Int13h.asm) |
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| 125 | %endif |
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[181] | 126 | |
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[179] | 127 | ;---------------------------------------------------------------------- |
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| 128 | ; |
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| 129 | ; Initialize UART |
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| 130 | ; |
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[181] | 131 | ; We do this each time since DOS (at boot) or another program may have |
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[179] | 132 | ; decided to reprogram the UART |
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| 133 | ; |
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[214] | 134 | mov bl,dl ; setup BL with proper values for read/write loops (BH comes later) |
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[223] | 135 | |
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[179] | 136 | mov al,83h |
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| 137 | add dl,SerialCommand_UART_lineControl |
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| 138 | out dx,al |
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| 139 | |
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| 140 | mov al,ch |
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[214] | 141 | mov dl,bl ; divisor low |
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[179] | 142 | out dx,al |
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| 143 | |
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| 144 | xor ax,ax |
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| 145 | inc dx ; divisor high |
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| 146 | push dx |
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| 147 | out dx,al |
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| 148 | |
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| 149 | mov al,047h |
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| 150 | inc dx ; fifo |
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[181] | 151 | out dx,al |
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[179] | 152 | |
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| 153 | mov al,03h |
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| 154 | inc dx ; linecontrol |
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| 155 | out dx,al |
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| 156 | |
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| 157 | mov al,0bh |
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| 158 | inc dx ; modemcontrol |
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| 159 | out dx,al |
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| 160 | |
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[214] | 161 | inc dx ; linestatus (no output now, just setting up BH for later use) |
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| 162 | mov bh,dl |
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| 163 | |
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[179] | 164 | pop dx ; base, interrupts disabled |
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| 165 | xor ax,ax |
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| 166 | out dx,al |
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| 167 | |
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| 168 | ;---------------------------------------------------------------------- |
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| 169 | ; |
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| 170 | ; Send Command |
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| 171 | ; |
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| 172 | ; Sends first six bytes of IDEREGS_AND_INTPACK as the command |
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| 173 | ; |
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| 174 | push es ; save off real buffer location |
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[214] | 175 | push si |
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[181] | 176 | |
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[214] | 177 | mov si,bp ; point to IDEREGS for command dispatch; |
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[179] | 178 | push ss |
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| 179 | pop es |
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| 180 | |
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[214] | 181 | mov di,0ffffh ; initialize checksum for write |
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| 182 | mov bp,di |
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[179] | 183 | |
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[214] | 184 | mov cx,4 ; writing 3 words (plus 1) |
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[181] | 185 | |
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[223] | 186 | cli ; interrupts off... |
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[179] | 187 | |
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[214] | 188 | call SerialCommand_WriteProtocol.entry |
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| 189 | |
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| 190 | pop di ; restore real buffer location (note change from SI to DI) |
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| 191 | ; Buffer is primarily referenced through ES:DI throughout, since |
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| 192 | ; we need to store (read sector) faster than we read (write sector) |
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[179] | 193 | pop es |
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| 194 | |
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[220] | 195 | %if 0 |
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| 196 | ;;; no longer needed, since the pointer is normalized before we are called and we do not support |
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| 197 | ;;; more than 128 sectors (and for 128 specifically, the pointer must be segment aligned). |
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| 198 | ;;; See comments below at the point this entry point was called for more details... |
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[223] | 199 | .nextSectorNormalize: |
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[220] | 200 | call Registers_NormalizeESDI |
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| 201 | %endif |
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[223] | 202 | |
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[179] | 203 | pop ax ; load command byte (done before call to .nextSector on subsequent iterations) |
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| 204 | push ax |
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| 205 | |
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| 206 | ; |
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| 207 | ; Top of the read/write loop, one iteration per sector |
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[181] | 208 | ; |
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[179] | 209 | .nextSector: |
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[214] | 210 | mov si,0ffffh ; initialize checksum for read or write |
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[179] | 211 | mov bp,si |
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| 212 | |
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[214] | 213 | mov cx,0101h ; writing 256 words (plus 1) |
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[181] | 214 | |
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[179] | 215 | shr ah,1 ; command byte, are we doing a write? |
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[214] | 216 | jnc .readEntry |
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[181] | 217 | |
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[214] | 218 | xchg si,di |
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| 219 | call SerialCommand_WriteProtocol.entry |
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| 220 | xchg si,di |
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[179] | 221 | |
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[214] | 222 | inc cx ; CX = 1 now (0 out of WriteProtocol) |
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| 223 | jmp .readEntry |
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[181] | 224 | |
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[179] | 225 | ;---------------------------------------------------------------------- |
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| 226 | ; |
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| 227 | ; Timeout |
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| 228 | ; |
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| 229 | ; 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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| 230 | ; |
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| 231 | .readTimeout: |
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[214] | 232 | push ax ; not only does this push preserve AX (which we need), but it also |
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[223] | 233 | ; means the stack has the same number of bytes on it as when we are |
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[214] | 234 | ; sending a packet, important for error cleanup and exit |
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| 235 | mov ah,1 |
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| 236 | call SerialCommand_WaitAndPoll_Read |
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| 237 | pop ax |
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[179] | 238 | test dl,1 |
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| 239 | jz .readByte1Ready |
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[223] | 240 | jmp .readByte2Ready |
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[179] | 241 | |
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| 242 | ;---------------------------------------------------------------------------- |
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| 243 | ; |
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| 244 | ; Read Block (without interrupts, used when there is a FIFO, high speed) |
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| 245 | ; |
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[181] | 246 | ; NOTE: This loop is very time sensitive. Literally, another instruction |
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[179] | 247 | ; cannot be inserted into this loop without us falling behind at high |
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[181] | 248 | ; speed (460.8K baud) on a 4.77Mhz 8088, making it hard to receive |
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[179] | 249 | ; a full 512 byte block. |
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| 250 | ; |
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[181] | 251 | .readLoop: |
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| 252 | stosw ; store word in caller's data buffer |
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| 253 | |
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[179] | 254 | add bp, ax ; update Fletcher's checksum |
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| 255 | adc bp, 0 |
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| 256 | add si, bp |
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| 257 | adc si, 0 |
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| 258 | |
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[223] | 259 | .readEntry: |
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[181] | 260 | mov dl,bh |
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| 261 | in al,dx |
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[179] | 262 | shr al,1 ; data ready (byte 1)? |
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[181] | 263 | mov dl,bl ; get ready to read data |
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[179] | 264 | jnc .readTimeout ; nope not ready, update timeouts |
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[181] | 265 | |
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| 266 | ; |
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[179] | 267 | ; Entry point after initial timeout. We enter here so that the checksum word |
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| 268 | ; is not stored (and is left in AX after the loop is complete). |
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[181] | 269 | ; |
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| 270 | .readByte1Ready: |
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[179] | 271 | in al, dx ; read data byte 1 |
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| 272 | |
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| 273 | mov ah, al ; store byte in ah for now |
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[181] | 274 | |
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[179] | 275 | ; |
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[181] | 276 | ; note the placement of this reset of dl to bh, and that it is |
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| 277 | ; before the return, which is assymetric with where this is done |
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| 278 | ; above for byte 1. The value of dl is used by the timeout routine |
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| 279 | ; to know which byte to return to (.read_byte1_ready or |
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[179] | 280 | ; .read_byte2_ready) |
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| 281 | ; |
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[181] | 282 | mov dl,bh |
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| 283 | |
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[179] | 284 | in al,dx |
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| 285 | shr al,1 ; data ready (byte 2)? |
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| 286 | jnc .readTimeout |
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[181] | 287 | .readByte2Ready: |
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| 288 | mov dl,bl |
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[179] | 289 | in al, dx ; read data byte 2 |
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| 290 | |
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| 291 | xchg al, ah ; ah was holding byte 1, reverse byte order |
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[181] | 292 | |
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[179] | 293 | loop .readLoop |
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| 294 | |
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[214] | 295 | sti ; interrupts back on ASAP, between packets |
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[181] | 296 | |
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[179] | 297 | ; |
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| 298 | ; Compare checksums |
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[181] | 299 | ; |
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[208] | 300 | xchg ax,bp |
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| 301 | xor ah,al |
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| 302 | mov cx,si |
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| 303 | xor cl,ch |
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| 304 | mov al,cl |
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[179] | 305 | cmp ax,bp |
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| 306 | jnz SerialCommand_OutputWithParameters_Error |
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| 307 | |
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| 308 | pop ax ; sector count and command byte |
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[223] | 309 | dec al ; decrement sector count |
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[179] | 310 | push ax ; save |
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[216] | 311 | jz SerialCommand_OutputWithParameters_ReturnCodeInALCF ; CF=0 from "cmp ax,bp" returning Zero above |
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[181] | 312 | |
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[179] | 313 | cli ; interrupts back off for ACK byte to host |
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| 314 | ; (host could start sending data immediately) |
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| 315 | out dx,al ; ACK with next sector number |
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[181] | 316 | |
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[220] | 317 | %if 0 |
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| 318 | ;;; This code is no longer needed as we do not support more than 128 sectors, and for 128 the pointer |
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| 319 | ;;; must be segment aligned. If we ever do want to support more sectors, the code can help... |
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[223] | 320 | |
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[214] | 321 | ; |
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[216] | 322 | ; Normalize buffer pointer for next go round, if needed. |
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[214] | 323 | ; |
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[223] | 324 | ; We need to re-normalize the pointer in ES:DI after processing every 7f sectors. That number could |
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[216] | 325 | ; have been 80 if we knew the offset was on a segment boundary, but this may not be the case. |
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| 326 | ; |
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| 327 | ; We re-normalize based on the sector count (flags from "dec al" above)... |
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| 328 | ; a) we normalize before the first sector goes out, immediately after sending the command packet (above) |
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| 329 | ; b) on transitions from FF to FE, very rare case for writing 255 or 256 sectors |
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| 330 | ; c) on transitions from 80 to 7F, a large read/write |
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[223] | 331 | ; d) on transitions from 00 to FF, very, very rare case of writing 256 sectors |
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| 332 | ; We don't need to renormalize in this case, but it isn't worth the memory/effort to not do |
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[216] | 333 | ; the extra work, and it does no harm. |
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| 334 | ; |
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| 335 | ; I really don't care much about (d) because I have not seen cases where any OS makes a request |
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| 336 | ; for more than 127 sectors. Back in the day, it appears that some BIOS could not support more than 127 |
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| 337 | ; sectors, so that may be the practical limit for OS and application developers. The Extended BIOS |
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[223] | 338 | ; function also appear to be capped at 127 sectors. So although this can support the full 256 sectors |
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[216] | 339 | ; if needed, we are optimized for that 1-127 range. |
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| 340 | ; |
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| 341 | ; Assume we start with 0000:000f, with 256 sectors to write... |
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| 342 | ; After first packet, 0000:020f |
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| 343 | ; First decrement of AL, transition from 00 to FF: renormalize to 0020:000f (unnecessary) |
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| 344 | ; After second packet, 0020:020f |
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| 345 | ; Second derement of AL, transition from FF to FE: renormalize to 0040:000f |
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| 346 | ; After 7f more packets, 0040:fe0f |
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| 347 | ; Decrement of AL, transition from 80 to 7F: renormalize to 1020:000f |
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| 348 | ; After 7f more packets, 1020:fe0f or 2000:000f if normalized |
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| 349 | ; Decrement of AL, from 1 to 0: exit |
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| 350 | ; |
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| 351 | jge short .nextSector ; OF=SF, branch for 1-7e, most common case |
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| 352 | ; (0 kicked out above for return success) |
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[179] | 353 | |
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[216] | 354 | add al,2 ; 7f-ff moves to 81-01 |
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| 355 | ; (0-7e kicked out before we get here) |
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| 356 | ; 7f moves to 81 and OF=1, so OF=SF |
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[223] | 357 | ; fe moves to 0 and OF=0, SF=0, so OF=SF |
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[216] | 358 | ; ff moves to 1 and OF=0, SF=0, so OF=SF |
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| 359 | ; 80-fd moves to 82-ff and OF=0, so OF<>SF |
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| 360 | |
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| 361 | jl short .nextSector ; OF<>SF, branch for all cases but 7f, fe, and ff |
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| 362 | |
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[220] | 363 | ; jpo short .nextSector ; if we really wanted to avoid normalizing for ff, this |
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[216] | 364 | ; is one way to do it, but it adds more memory and more |
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| 365 | ; cycles for the 7f and fe cases. IMHO, given that I've |
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| 366 | ; never seen a request for more than 7f, this seems unnecessary. |
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| 367 | |
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| 368 | jmp short .nextSectorNormalize ; our two renormalization cases (plus one for ff) |
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| 369 | |
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[220] | 370 | %else |
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[223] | 371 | |
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| 372 | jmp short .nextSector |
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| 373 | |
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[220] | 374 | %endif |
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| 375 | |
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[179] | 376 | ;--------------------------------------------------------------------------- |
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| 377 | ; |
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| 378 | ; Cleanup, error reporting, and exit |
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| 379 | ; |
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[181] | 380 | |
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| 381 | ; |
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[179] | 382 | ; Used in situations where a call is underway, such as with SerialCommand_WaitAndPoll |
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[181] | 383 | ; |
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[214] | 384 | ALIGN JUMP_ALIGN |
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| 385 | SerialCommand_OutputWithParameters_ErrorAndPop4Words: |
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| 386 | add sp,8 |
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[216] | 387 | ;;; fall-through |
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[179] | 388 | |
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[214] | 389 | ALIGN JUMP_ALIGN |
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[181] | 390 | SerialCommand_OutputWithParameters_Error: |
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[216] | 391 | ;---------------------------------------------------------------------- |
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| 392 | ; |
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| 393 | ; Clear read buffer |
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| 394 | ; |
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| 395 | ; In case there are extra characters or an error in the FIFO, clear it out. |
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| 396 | ; In theory the initialization of the UART registers above should have |
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| 397 | ; taken care of this, but I have seen cases where this is not true. |
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| 398 | ; |
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[233] | 399 | xor cx,cx ; timeout this clearing routine, in case the UART isn't there |
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[216] | 400 | .clearBuffer: |
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| 401 | mov dl,bh |
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| 402 | in al,dx |
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| 403 | mov dl,bl |
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| 404 | test al,08fh |
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| 405 | jz .clearBufferComplete |
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[233] | 406 | test al,1 |
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[216] | 407 | in al,dx |
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[233] | 408 | loopnz .clearBuffer ; note ZF from test above |
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[216] | 409 | |
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[223] | 410 | .clearBufferComplete: |
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[181] | 411 | stc |
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[179] | 412 | mov al,1 |
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| 413 | |
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[214] | 414 | ALIGN JUMP_ALIGN |
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[181] | 415 | SerialCommand_OutputWithParameters_ReturnCodeInALCF: |
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[216] | 416 | %if 0 |
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| 417 | sti ; all paths here will already have interrupts turned back on |
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| 418 | %endif |
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[179] | 419 | mov ah,al |
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| 420 | |
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[214] | 421 | pop bp ; recover ax (command and count) from stack, throw away |
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[179] | 422 | |
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| 423 | pop bp |
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| 424 | pop di |
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| 425 | pop si |
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| 426 | |
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| 427 | ret |
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| 428 | |
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[150] | 429 | ;-------------------------------------------------------------------- |
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[214] | 430 | ; SerialCommand_WriteProtocol |
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[179] | 431 | ; |
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[223] | 432 | ; NOTE: As with its read counterpart, this loop is very time sensitive. |
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| 433 | ; Although it will still function, adding additional instructions will |
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| 434 | ; impact the write throughput, especially on slower machines. |
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[214] | 435 | ; |
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[179] | 436 | ; Parameters: |
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[214] | 437 | ; ES:SI: Ptr to buffer |
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| 438 | ; CX: Words to write, plus 1 |
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| 439 | ; BP/DI: Initialized for Checksum (-1 in each) |
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| 440 | ; DH: I/O Port high byte |
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| 441 | ; BX: LineStatus Register address (BH) and Receive/Transmit Register address (BL) |
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[179] | 442 | ; Returns: |
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[214] | 443 | ; BP/DI: Checksum for written bytes, compared against ACK from server in .readLoop |
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| 444 | ; CX: Zero |
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| 445 | ; DL: Receive/Transmit Register address |
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[181] | 446 | ; Corrupts registers: |
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[214] | 447 | ; AX |
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[179] | 448 | ;-------------------------------------------------------------------- |
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[214] | 449 | ALIGN JUMP_ALIGN |
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| 450 | SerialCommand_WriteProtocol: |
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| 451 | .writeLoop: |
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| 452 | es lodsw ; fetch next word |
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[179] | 453 | |
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[214] | 454 | out dx,al ; output first byte |
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[179] | 455 | |
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[214] | 456 | add bp,ax ; update checksum |
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| 457 | adc bp,0 |
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| 458 | add di,bp |
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| 459 | adc di,0 |
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[181] | 460 | |
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[214] | 461 | mov dl,bh ; transmit buffer empty? |
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[179] | 462 | in al,dx |
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[214] | 463 | test al,20h |
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| 464 | jz .writeTimeout2 ; nope, use our polling routine |
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[181] | 465 | |
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[214] | 466 | .writeByte2Ready: |
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| 467 | mov dl,bl |
---|
| 468 | mov al,ah ; output second byte |
---|
| 469 | out dx,al |
---|
| 470 | |
---|
| 471 | .entry: |
---|
| 472 | mov dl,bh ; transmit buffer empty? |
---|
| 473 | in al,dx |
---|
| 474 | test al,20h |
---|
| 475 | mov dl,bl |
---|
| 476 | jz .writeTimeout1 ; nope, use our polling routine |
---|
| 477 | |
---|
| 478 | .writeByte1Ready: |
---|
| 479 | loop .writeLoop |
---|
| 480 | |
---|
| 481 | mov ax,di ; fold Fletcher's checksum and output |
---|
| 482 | xor al,ah |
---|
| 483 | out dx,al ; byte 1 |
---|
| 484 | |
---|
| 485 | call SerialCommand_WaitAndPoll_Write |
---|
| 486 | |
---|
| 487 | mov ax,bp |
---|
| 488 | xor al,ah |
---|
| 489 | out dx,al ; byte 2 |
---|
| 490 | |
---|
[179] | 491 | ret |
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| 492 | |
---|
[214] | 493 | .writeTimeout2: |
---|
| 494 | mov dl,ah ; need to preserve AH, but don't need DL (will be reset upon return) |
---|
| 495 | call SerialCommand_WaitAndPoll_Write |
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| 496 | mov ah,dl |
---|
| 497 | jmp .writeByte2Ready |
---|
[223] | 498 | |
---|
[214] | 499 | .writeTimeout1: |
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[223] | 500 | %ifndef USE_186 |
---|
[214] | 501 | mov ax,.writeByte1Ready |
---|
| 502 | push ax ; return address for ret at end of SC_writeTimeout2 |
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[223] | 503 | %else |
---|
| 504 | push .writeByte1Ready |
---|
| 505 | %endif |
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[214] | 506 | ;;; fall-through |
---|
| 507 | |
---|
[179] | 508 | ;-------------------------------------------------------------------- |
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[214] | 509 | ; SerialCommand_WaitAndPoll |
---|
[179] | 510 | ; |
---|
| 511 | ; Parameters: |
---|
[214] | 512 | ; AH: UART_LineStatus bit to test (20h for write, or 1h for read) |
---|
| 513 | ; One entry point fills in AH with 20h for write |
---|
| 514 | ; DX: Port address (OK if already incremented to UART_lineStatus) |
---|
[223] | 515 | ; BX: |
---|
[214] | 516 | ; Stack: 2 words on the stack below the command/count word |
---|
[179] | 517 | ; Returns: |
---|
[214] | 518 | ; Returns when desired UART_LineStatus bit is cleared |
---|
| 519 | ; Jumps directly to error exit if timeout elapses (and cleans up stack) |
---|
[179] | 520 | ; Corrupts registers: |
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[214] | 521 | ; AX |
---|
[179] | 522 | ;-------------------------------------------------------------------- |
---|
[181] | 523 | |
---|
[214] | 524 | SerialCommand_WaitAndPoll_SoftDelayTicks EQU 20 |
---|
[181] | 525 | |
---|
[214] | 526 | ALIGN JUMP_ALIGN |
---|
| 527 | SerialCommand_WaitAndPoll_Write: |
---|
| 528 | mov ah,20h |
---|
| 529 | ;;; fall-through |
---|
[181] | 530 | |
---|
[214] | 531 | ALIGN JUMP_ALIGN |
---|
| 532 | SerialCommand_WaitAndPoll_Read: |
---|
| 533 | push cx |
---|
| 534 | push dx |
---|
[150] | 535 | |
---|
[214] | 536 | ; |
---|
| 537 | ; We first poll in a tight loop, interrupts off, for the next character to come in/be sent |
---|
| 538 | ; |
---|
| 539 | xor cx,cx |
---|
| 540 | .readTimeoutLoop: |
---|
[223] | 541 | mov dl,bh |
---|
[214] | 542 | in al,dx |
---|
| 543 | test al,ah |
---|
| 544 | jnz .readTimeoutComplete |
---|
| 545 | loop .readTimeoutLoop |
---|
[181] | 546 | |
---|
[214] | 547 | ; |
---|
| 548 | ; If that loop completes, then we assume there is a long delay involved, turn interrupts back on |
---|
| 549 | ; and wait for a given number of timer ticks to pass. |
---|
| 550 | ; |
---|
| 551 | sti |
---|
| 552 | mov cl,SerialCommand_WaitAndPoll_SoftDelayTicks |
---|
| 553 | call Timer_InitializeTimeoutWithTicksInCL |
---|
| 554 | .WaitAndPoll: |
---|
| 555 | call Timer_SetCFifTimeout |
---|
| 556 | jc SerialCommand_OutputWithParameters_ErrorAndPop4Words |
---|
| 557 | in al,dx |
---|
| 558 | test al,ah |
---|
| 559 | jz .WaitAndPoll |
---|
| 560 | cli |
---|
[150] | 561 | |
---|
[214] | 562 | .readTimeoutComplete: |
---|
| 563 | pop dx |
---|
| 564 | pop cx |
---|
| 565 | ret |
---|
[181] | 566 | |
---|
[179] | 567 | ;-------------------------------------------------------------------- |
---|
| 568 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
---|
| 569 | ; Parameters: |
---|
| 570 | ; BH: Drive Select byte for Drive and Head Select Register |
---|
| 571 | ; DS: Segment to RAMVARS |
---|
| 572 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
---|
| 573 | ; CS:BP: Ptr to IDEVARS |
---|
| 574 | ; Returns: |
---|
| 575 | ; AH: INT 13h Error Code |
---|
[223] | 576 | ; NOTE: Not set (or checked) during drive detection |
---|
[179] | 577 | ; CF: Cleared if success, Set if error |
---|
| 578 | ; Corrupts registers: |
---|
| 579 | ; AL, BL, CX, DX, SI, DI, ES |
---|
| 580 | ;-------------------------------------------------------------------- |
---|
| 581 | ALIGN JUMP_ALIGN |
---|
| 582 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH: |
---|
[203] | 583 | ; |
---|
[223] | 584 | ; To improve boot time, we do our best to avoid looking for slave serial drives when we already know the results |
---|
| 585 | ; from the looking for a master. This is particularly true when doing a COM port scan, as we will end up running |
---|
| 586 | ; through all the COM ports and baud rates a second time. |
---|
[203] | 587 | ; |
---|
[223] | 588 | ; But drive detection isn't the only case - we also need to get the right drive when called on int13h/25h. |
---|
[203] | 589 | ; |
---|
| 590 | ; The decision tree: |
---|
| 591 | ; |
---|
| 592 | ; Master: |
---|
| 593 | ; bSerialPackedPortAndBaud Non-Zero: -> Continue with bSerialPackedAndBaud (1) |
---|
[223] | 594 | ; bSerialPackedPortAndBaud Zero: |
---|
[203] | 595 | ; bLastSerial Zero: -> Scan (2) |
---|
| 596 | ; bLastSerial Non-Zero: -> Continue with bLastSerial (3) |
---|
[223] | 597 | ; |
---|
[203] | 598 | ; Slave: |
---|
[223] | 599 | ; bSerialPackedPortAndBaud Non-Zero: |
---|
[203] | 600 | ; bLastSerial Zero: -> Error - Not Found (4) |
---|
| 601 | ; bLastSerial Non-Zero: -> Continue with bSerialPackedAndBaud (5) |
---|
[223] | 602 | ; bSerialPackedPortAndBaud Zero: |
---|
[203] | 603 | ; bLastSerial Zero: -> Error - Not Found (4) |
---|
| 604 | ; bLastSerial Non-Zero: -> Continue with bLastSerial (6) |
---|
| 605 | ; |
---|
[223] | 606 | ; (1) This was a port/baud that was explicitly set with the configurator. In the drive detection case, as this |
---|
| 607 | ; is the Master, we are checking out a new controller, and so don't care about the value of bLastSerial. |
---|
[203] | 608 | ; And as with the int13h/25h case, we just go off and get the needed information using the user's setting. |
---|
[223] | 609 | ; (2) We are using the special .ideVarsSerialAuto structure. During drive detection, we would only be here |
---|
[203] | 610 | ; if bLastSerial is zero (since we only scan if no explicit drives are set), so we go off to scan. |
---|
[223] | 611 | ; (3) We are using the special .ideVarsSerialAuto structure. We won't get here during drive detection, but |
---|
[203] | 612 | ; we might get here on an int13h/25h call. If we have scanned COM drives, they are the ONLY serial drives |
---|
| 613 | ; in use, and so bLastSerial will reflect the port/baud setting for the scanned COM drives. |
---|
[223] | 614 | ; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time, |
---|
[203] | 615 | ; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we |
---|
| 616 | ; will scan for a slave even if a master is not present. Note that if ANY master had been previously found, |
---|
[223] | 617 | ; we will do the slave scan, which isn't harmful, it just wastes time. But the most common case (by a wide |
---|
[203] | 618 | ; margin) will be just one serial controller. |
---|
| 619 | ; (5) A COM port scan for a master had been previously completed, and a drive was found. In a multiple serial |
---|
[223] | 620 | ; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud |
---|
[203] | 621 | ; to make sure we get the proper drive. |
---|
[223] | 622 | ; (6) A COM port scan for a master had been previously completed, and a drive was found. We would only get here |
---|
| 623 | ; if no serial drive was explicitly set by the user in the configurator or that drive had not been found. |
---|
| 624 | ; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the |
---|
[203] | 625 | ; master scan. |
---|
[223] | 626 | ; |
---|
[233] | 627 | mov cx,1 ; 1 sector to move, 0 for non-scan |
---|
| 628 | mov dx,[cs:bp+IDEVARS.wSerialPortAndBaud] |
---|
| 629 | xor ax,ax |
---|
| 630 | push si |
---|
| 631 | call FindDPT_ToDSDIforSerialDevice |
---|
| 632 | pop si |
---|
| 633 | jnc .notfounddpt |
---|
| 634 | mov ax,[ds:di+DPT_SERIAL.wSerialPortAndBaud] |
---|
| 635 | .notfounddpt: |
---|
[223] | 636 | |
---|
[203] | 637 | test bh, FLG_DRVNHEAD_DRV |
---|
| 638 | jz .master |
---|
[179] | 639 | |
---|
[233] | 640 | test ax,ax ; Take care of the case that is different between master and slave. |
---|
[203] | 641 | jz .error ; Because we do this here, the jz after the "or" below will not be taken |
---|
| 642 | |
---|
| 643 | ; fall-through |
---|
[223] | 644 | .master: |
---|
[233] | 645 | test dx,dx |
---|
| 646 | jnz .identifyDeviceInDX |
---|
[179] | 647 | |
---|
[233] | 648 | or dx,ax ; Move bLast into position in dl, as well as test for zero |
---|
[203] | 649 | jz .scanSerial |
---|
[223] | 650 | |
---|
[179] | 651 | ; fall-through |
---|
[233] | 652 | .identifyDeviceInDX: |
---|
[179] | 653 | |
---|
| 654 | push bp ; setup fake IDEREGS_AND_INTPACK |
---|
| 655 | |
---|
| 656 | push dx |
---|
| 657 | |
---|
| 658 | push cx |
---|
| 659 | |
---|
| 660 | mov bl,0a0h ; protocol command to ah and onto stack with bh |
---|
| 661 | mov ah,bl |
---|
[181] | 662 | |
---|
[179] | 663 | push bx |
---|
| 664 | |
---|
| 665 | mov bp,sp |
---|
[233] | 666 | call SerialCommand_OutputWithParameters_DeviceInDX |
---|
[179] | 667 | |
---|
| 668 | pop bx |
---|
[181] | 669 | |
---|
| 670 | pop cx |
---|
[179] | 671 | pop dx |
---|
[233] | 672 | |
---|
[179] | 673 | pop bp |
---|
[223] | 674 | ; |
---|
[203] | 675 | ; place packed port/baud in RAMVARS, read by FinalizeDPT and DetectDrives |
---|
| 676 | ; |
---|
[233] | 677 | mov [es:si+ATA6.wVendor],dx |
---|
[179] | 678 | |
---|
[223] | 679 | .notFound: |
---|
[179] | 680 | ret |
---|
| 681 | |
---|
| 682 | ;---------------------------------------------------------------------- |
---|
| 683 | ; |
---|
| 684 | ; SerialCommand_AutoSerial |
---|
| 685 | ; |
---|
| 686 | ; When the SerialAuto IDEVARS entry is used, scans the COM ports on the machine for a possible serial connection. |
---|
[181] | 687 | ; |
---|
| 688 | |
---|
[203] | 689 | .scanPortAddresses: db DEVICE_SERIAL_COM7 >> 2 |
---|
| 690 | db DEVICE_SERIAL_COM6 >> 2 |
---|
| 691 | db DEVICE_SERIAL_COM5 >> 2 |
---|
| 692 | db DEVICE_SERIAL_COM4 >> 2 |
---|
| 693 | db DEVICE_SERIAL_COM3 >> 2 |
---|
| 694 | db DEVICE_SERIAL_COM2 >> 2 |
---|
| 695 | db DEVICE_SERIAL_COM1 >> 2 |
---|
| 696 | db 0 |
---|
[179] | 697 | |
---|
[181] | 698 | ALIGN JUMP_ALIGN |
---|
[203] | 699 | .scanSerial: |
---|
| 700 | mov di,.scanPortAddresses-1 |
---|
[233] | 701 | mov ch,1 ; tell server that we are scanning |
---|
[181] | 702 | |
---|
[179] | 703 | .nextPort: |
---|
| 704 | inc di ; load next port address |
---|
[223] | 705 | xor dh, dh |
---|
[179] | 706 | mov dl,[cs:di] |
---|
[223] | 707 | eSHL_IM dx, 2 ; shift from one byte to two |
---|
[203] | 708 | jz .error |
---|
[179] | 709 | |
---|
| 710 | ; |
---|
| 711 | ; Test for COM port presence, write to and read from registers |
---|
[181] | 712 | ; |
---|
| 713 | push dx |
---|
[179] | 714 | add dl,SerialCommand_UART_lineControl |
---|
| 715 | mov al, 09ah |
---|
| 716 | out dx, al |
---|
| 717 | in al, dx |
---|
| 718 | pop dx |
---|
| 719 | cmp al, 09ah |
---|
[181] | 720 | jnz .nextPort |
---|
[179] | 721 | |
---|
| 722 | mov al, 0ch |
---|
| 723 | out dx, al |
---|
| 724 | in al, dx |
---|
| 725 | cmp al, 0ch |
---|
| 726 | jnz .nextPort |
---|
| 727 | |
---|
| 728 | ; |
---|
[233] | 729 | ; Begin baud rate scan on this port... |
---|
[181] | 730 | ; |
---|
[233] | 731 | ; On a scan, we support 6 baud rates, starting here and going higher by a factor of two each step, with a |
---|
| 732 | ; small jump between 9600 and 38800. These 6 were selected since we wanted to support 9600 baud and 115200, |
---|
| 733 | ; *on the server side* if the client side had a 4x clock multiplier, a 2x clock multiplier, or no clock multiplier. |
---|
[179] | 734 | ; |
---|
[233] | 735 | ; Starting with 30h, that means 30h (2400 baud), 18h (4800 baud), 0ch (9600 baud), and |
---|
| 736 | ; 04h (28800 baud), 02h (57600 baud), 01h (115200 baud) |
---|
[181] | 737 | ; |
---|
[233] | 738 | ; Note: hardware baud multipliers (2x, 4x) will impact the final baud rate and are not known at this level |
---|
| 739 | ; |
---|
| 740 | mov dh,030h * 2 ; multiply by 2 since we are about to divide by 2 |
---|
| 741 | mov dl,[cs:di] ; restore single byte port address for scan |
---|
| 742 | |
---|
[181] | 743 | .nextBaud: |
---|
[233] | 744 | shr dh,1 |
---|
[179] | 745 | jz .nextPort |
---|
[233] | 746 | cmp dh,6 ; skip from 6 to 4, to move from the top of the 9600 baud range |
---|
| 747 | jnz .testBaud ; to the bottom of the 115200 baud range |
---|
| 748 | mov dh,4 |
---|
[181] | 749 | |
---|
[233] | 750 | .testBaud: |
---|
| 751 | call .identifyDeviceInDX |
---|
[179] | 752 | jc .nextBaud |
---|
| 753 | |
---|
| 754 | ret |
---|
[181] | 755 | |
---|
[223] | 756 | .error: |
---|
[181] | 757 | stc |
---|
[216] | 758 | %if 0 |
---|
| 759 | mov ah,1 ; setting the error code is unnecessary as this path can only be taken during |
---|
| 760 | ; drive detection, and drive detection works off CF and does not check AH |
---|
| 761 | %endif |
---|
[203] | 762 | ret |
---|
[179] | 763 | |
---|
[203] | 764 | |
---|