[150] | 1 | ; Project name : XTIDE Universal BIOS |
---|
| 2 | ; Description : Serial Device Command functions. |
---|
| 3 | |
---|
| 4 | ; Section containing code |
---|
| 5 | SECTION .text |
---|
| 6 | |
---|
[179] | 7 | ;--------------- UART Equates ----------------------------- |
---|
| 8 | ; |
---|
| 9 | ; Serial Programming References: |
---|
| 10 | ; http://en.wikibooks.org/wiki/Serial_Programming |
---|
| 11 | ; |
---|
[181] | 12 | |
---|
[179] | 13 | SerialCommand_UART_base EQU 0 |
---|
| 14 | SerialCommand_UART_transmitByte EQU 0 |
---|
| 15 | SerialCommand_UART_receiveByte EQU 0 |
---|
| 16 | SerialCommand_UART_divisorLow EQU 0 |
---|
[181] | 17 | ; Values for UART_divisorLow: |
---|
[179] | 18 | ; 60h = 1200, 30h = 2400, 18h = 4800, 0ch = 9600, 6 = 19200, 3 = 38400, 2 = 57600, 1 = 115200 |
---|
| 19 | |
---|
| 20 | SerialCommand_UART_divisorLow_startingBaud EQU 030h |
---|
| 21 | ; We support 4 baud rates, starting here going higher and skipping every other baud rate |
---|
| 22 | ; Starting with 30h, that means 30h (1200 baud), 0ch (9600 baud), 3 (38400 baud), and 1 (115200 baud) |
---|
| 23 | ; Note: hardware baud multipliers (2x, 4x) will impact the final baud rate and are not known at this level |
---|
| 24 | |
---|
[181] | 25 | SerialCommand_UART_interruptEnable EQU 1 |
---|
[179] | 26 | SerialCommand_UART_divisorHigh EQU 1 |
---|
| 27 | ; UART_divisorHigh is zero for all speeds including and above 1200 baud |
---|
| 28 | |
---|
| 29 | SerialCommand_UART_interruptIdent EQU 2 |
---|
| 30 | SerialCommand_UART_FIFOControl EQU 2 |
---|
| 31 | |
---|
| 32 | SerialCommand_UART_lineControl EQU 3 |
---|
[181] | 33 | |
---|
[179] | 34 | SerialCommand_UART_modemControl EQU 4 |
---|
| 35 | |
---|
| 36 | SerialCommand_UART_lineStatus EQU 5 |
---|
| 37 | |
---|
| 38 | SerialCommand_UART_modemStatus EQU 6 |
---|
| 39 | |
---|
| 40 | SerialCommand_UART_scratch EQU 7 |
---|
| 41 | |
---|
| 42 | SerialCommand_Protocol_Write EQU 3 |
---|
| 43 | SerialCommand_Protocol_Read EQU 2 |
---|
| 44 | SerialCommand_Protocol_Inquire EQU 0 |
---|
| 45 | SerialCommand_Protocol_Header EQU 0a0h |
---|
[181] | 46 | |
---|
[150] | 47 | ;-------------------------------------------------------------------- |
---|
[179] | 48 | ; SerialCommand_OutputWithParameters |
---|
[150] | 49 | ; Parameters: |
---|
[179] | 50 | ; BH: Non-zero if 48-bit addressing used |
---|
| 51 | ; (ignored at present as 48-bit addressing is not supported) |
---|
| 52 | ; BL: IDE Status Register bit to poll after command |
---|
| 53 | ; (ignored at present, since there is no IDE status register to poll) |
---|
| 54 | ; ES:SI: Ptr to buffer (for data transfer commands) |
---|
| 55 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
---|
| 56 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
---|
[150] | 57 | ; Returns: |
---|
| 58 | ; AH: INT 13h Error Code |
---|
| 59 | ; CF: Cleared if success, Set if error |
---|
| 60 | ; Corrupts registers: |
---|
[179] | 61 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
---|
[150] | 62 | ;-------------------------------------------------------------------- |
---|
| 63 | ALIGN JUMP_ALIGN |
---|
[179] | 64 | SerialCommand_OutputWithParameters: |
---|
[181] | 65 | |
---|
[179] | 66 | mov ah,(SerialCommand_Protocol_Header | SerialCommand_Protocol_Read) |
---|
[181] | 67 | |
---|
[179] | 68 | mov al,[bp+IDEPACK.bCommand] |
---|
[150] | 69 | |
---|
[179] | 70 | cmp al,20h ; Read Sectors IDE command |
---|
| 71 | jz .readOrWrite |
---|
| 72 | inc ah ; now SerialCommand_Protocol_Write |
---|
| 73 | cmp al,30h ; Write Sectors IDE command |
---|
| 74 | jz .readOrWrite |
---|
[181] | 75 | |
---|
[179] | 76 | ; all other commands return success |
---|
| 77 | ; including function 0ech which should return drive information, this is handled with the identify functions |
---|
| 78 | xor ah,ah ; also clears carry |
---|
| 79 | ret |
---|
[181] | 80 | |
---|
| 81 | .readOrWrite: |
---|
[179] | 82 | mov [bp+IDEPACK.bFeatures],ah ; store protocol command |
---|
[181] | 83 | |
---|
| 84 | mov dl, byte [di+DPT.bSerialPortAndBaud] |
---|
| 85 | |
---|
[179] | 86 | ; fall-through |
---|
[150] | 87 | |
---|
| 88 | ;-------------------------------------------------------------------- |
---|
[179] | 89 | ; SerialCommand_OutputWithParameters_DeviceInDL |
---|
[150] | 90 | ; Parameters: |
---|
[181] | 91 | ; AH: Protocol Command |
---|
[179] | 92 | ; DL: Packed I/O port and baud rate |
---|
[150] | 93 | ; ES:SI: Ptr to buffer (for data transfer commands) |
---|
| 94 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK |
---|
| 95 | ; Returns: |
---|
| 96 | ; AH: INT 13h Error Code |
---|
| 97 | ; CF: Cleared if success, Set if error |
---|
| 98 | ; Corrupts registers: |
---|
| 99 | ; AL, BX, CX, DX, (ES:SI for data transfer commands) |
---|
[181] | 100 | ;-------------------------------------------------------------------- |
---|
[179] | 101 | SerialCommand_OutputWithParameters_DeviceInDL: |
---|
[181] | 102 | |
---|
[179] | 103 | push si |
---|
| 104 | push di |
---|
| 105 | push bp |
---|
| 106 | push es |
---|
| 107 | |
---|
[181] | 108 | ; |
---|
[179] | 109 | ; Unpack I/O port and baud from DPT |
---|
| 110 | ; Port to DX more or less for the remainder of the routine |
---|
| 111 | ; Baud in CH until UART initialization is complete |
---|
| 112 | ; |
---|
| 113 | mov cl, dl |
---|
[181] | 114 | |
---|
[199] | 115 | and cl, DEVICE_SERIAL_PACKEDPORTANDBAUD_BAUDMASK |
---|
[179] | 116 | shl cl, 1 |
---|
| 117 | mov ch, SerialCommand_UART_divisorLow_startingBaud |
---|
| 118 | shr ch, cl |
---|
| 119 | adc ch, 0 |
---|
| 120 | |
---|
[199] | 121 | and dl, DEVICE_SERIAL_PACKEDPORTANDBAUD_PORTMASK |
---|
[181] | 122 | mov dh, 0 |
---|
[196] | 123 | shl dx, 1 ; port offset already x4, needs one more shift to be x8 |
---|
[199] | 124 | add dx, DEVICE_SERIAL_PACKEDPORTANDBAUD_STARTINGPORT |
---|
[179] | 125 | |
---|
| 126 | ; |
---|
| 127 | ; Buffer is referenced through ES:DI throughout, since we need to store faster than we read |
---|
[181] | 128 | ; |
---|
[179] | 129 | mov di,si |
---|
| 130 | |
---|
| 131 | mov al,[bp+IDEPACK.bSectorCount] |
---|
| 132 | |
---|
| 133 | ; |
---|
| 134 | ; Command byte and sector count live at the top of the stack, pop/push are used to access |
---|
[181] | 135 | ; |
---|
[179] | 136 | push ax |
---|
| 137 | |
---|
[181] | 138 | ; cld ; Shouldn't be needed. DF has already been cleared (line 24, Int13h.asm) |
---|
| 139 | |
---|
[179] | 140 | ;---------------------------------------------------------------------- |
---|
| 141 | ; |
---|
| 142 | ; Initialize UART |
---|
| 143 | ; |
---|
[181] | 144 | ; We do this each time since DOS (at boot) or another program may have |
---|
[179] | 145 | ; decided to reprogram the UART |
---|
| 146 | ; |
---|
| 147 | push dx |
---|
[181] | 148 | |
---|
[179] | 149 | mov al,83h |
---|
| 150 | add dl,SerialCommand_UART_lineControl |
---|
| 151 | out dx,al |
---|
| 152 | |
---|
| 153 | mov al,ch |
---|
| 154 | pop dx ; divisor low |
---|
| 155 | out dx,al |
---|
| 156 | |
---|
| 157 | xor ax,ax |
---|
| 158 | inc dx ; divisor high |
---|
| 159 | push dx |
---|
| 160 | out dx,al |
---|
| 161 | |
---|
| 162 | mov al,047h |
---|
| 163 | inc dx ; fifo |
---|
[181] | 164 | out dx,al |
---|
[179] | 165 | |
---|
| 166 | mov al,03h |
---|
| 167 | inc dx ; linecontrol |
---|
| 168 | out dx,al |
---|
| 169 | |
---|
| 170 | mov al,0bh |
---|
| 171 | inc dx ; modemcontrol |
---|
| 172 | out dx,al |
---|
| 173 | |
---|
| 174 | pop dx ; base, interrupts disabled |
---|
| 175 | xor ax,ax |
---|
| 176 | out dx,al |
---|
| 177 | dec dx |
---|
| 178 | |
---|
| 179 | ;---------------------------------------------------------------------- |
---|
| 180 | ; |
---|
| 181 | ; Send Command |
---|
| 182 | ; |
---|
| 183 | ; Sends first six bytes of IDEREGS_AND_INTPACK as the command |
---|
| 184 | ; |
---|
| 185 | call Registers_NormalizeESDI |
---|
| 186 | |
---|
| 187 | push es ; save off real buffer location |
---|
| 188 | push di |
---|
[181] | 189 | |
---|
| 190 | mov di,bp ; point to IDEREGS for command dispatch; |
---|
[179] | 191 | push ss |
---|
| 192 | pop es |
---|
| 193 | |
---|
| 194 | xor si,si ; initialize checksum for write |
---|
[181] | 195 | dec si |
---|
[179] | 196 | mov bp,si |
---|
| 197 | |
---|
| 198 | mov bl,03h ; writing 3 words |
---|
[181] | 199 | |
---|
[179] | 200 | call SerialCommand_WriteProtocol |
---|
| 201 | |
---|
| 202 | pop di ; restore real buffer location |
---|
| 203 | pop es |
---|
| 204 | |
---|
| 205 | pop ax ; load command byte (done before call to .nextSector on subsequent iterations) |
---|
| 206 | push ax |
---|
| 207 | |
---|
| 208 | ; |
---|
| 209 | ; Top of the read/write loop, one iteration per sector |
---|
[181] | 210 | ; |
---|
[179] | 211 | .nextSector: |
---|
| 212 | xor si,si ; initialize checksum for read or write |
---|
| 213 | dec si |
---|
| 214 | mov bp,si |
---|
| 215 | |
---|
| 216 | mov bx,0100h |
---|
[181] | 217 | |
---|
[179] | 218 | shr ah,1 ; command byte, are we doing a write? |
---|
| 219 | jnc .readSector |
---|
| 220 | call SerialCommand_WriteProtocol |
---|
[181] | 221 | |
---|
[179] | 222 | xor bx,bx |
---|
| 223 | |
---|
| 224 | .readSector: |
---|
| 225 | mov cx,bx |
---|
| 226 | inc cx |
---|
[181] | 227 | |
---|
[179] | 228 | mov bl,dl ; setup bl with proper values for read loop (bh comes later) |
---|
| 229 | |
---|
| 230 | ;---------------------------------------------------------------------- |
---|
| 231 | ; |
---|
| 232 | ; Timeout |
---|
| 233 | ; |
---|
| 234 | ; During read, we first poll in a tight loop, interrupts off, for the next character to come in |
---|
| 235 | ; If that loop completes, then we assume there is a long delay involved, turn interrupts back on |
---|
| 236 | ; and wait for a given number of timer ticks to pass. |
---|
| 237 | ; |
---|
| 238 | ; To save code space, we use the contents of DL to decide which byte in the word to return for reading. |
---|
| 239 | ; |
---|
| 240 | .readTimeout: |
---|
| 241 | push cx |
---|
| 242 | xor cx,cx |
---|
[181] | 243 | .readTimeoutLoop: |
---|
[179] | 244 | push dx |
---|
| 245 | or dl,SerialCommand_UART_lineStatus |
---|
| 246 | in al,dx |
---|
| 247 | pop dx |
---|
| 248 | shr al,1 |
---|
| 249 | jc .readTimeoutComplete |
---|
| 250 | loop .readTimeoutLoop |
---|
| 251 | sti |
---|
| 252 | mov bh,1 |
---|
| 253 | call SerialCommand_WaitAndPoll_Init |
---|
[181] | 254 | cli |
---|
[179] | 255 | .readTimeoutComplete: |
---|
| 256 | mov bh,bl |
---|
| 257 | or bh,SerialCommand_UART_lineStatus |
---|
[181] | 258 | |
---|
[179] | 259 | pop cx |
---|
| 260 | test dl,1 |
---|
| 261 | jz .readByte1Ready |
---|
| 262 | jmp .readByte2Ready |
---|
| 263 | |
---|
| 264 | ;---------------------------------------------------------------------------- |
---|
| 265 | ; |
---|
| 266 | ; Read Block (without interrupts, used when there is a FIFO, high speed) |
---|
| 267 | ; |
---|
[181] | 268 | ; NOTE: This loop is very time sensitive. Literally, another instruction |
---|
[179] | 269 | ; cannot be inserted into this loop without us falling behind at high |
---|
[181] | 270 | ; speed (460.8K baud) on a 4.77Mhz 8088, making it hard to receive |
---|
[179] | 271 | ; a full 512 byte block. |
---|
| 272 | ; |
---|
[181] | 273 | .readLoop: |
---|
| 274 | stosw ; store word in caller's data buffer |
---|
| 275 | |
---|
[179] | 276 | add bp, ax ; update Fletcher's checksum |
---|
| 277 | adc bp, 0 |
---|
| 278 | add si, bp |
---|
| 279 | adc si, 0 |
---|
| 280 | |
---|
[181] | 281 | mov dl,bh |
---|
| 282 | in al,dx |
---|
[179] | 283 | shr al,1 ; data ready (byte 1)? |
---|
[181] | 284 | mov dl,bl ; get ready to read data |
---|
[179] | 285 | jnc .readTimeout ; nope not ready, update timeouts |
---|
[181] | 286 | |
---|
| 287 | ; |
---|
[179] | 288 | ; Entry point after initial timeout. We enter here so that the checksum word |
---|
| 289 | ; is not stored (and is left in AX after the loop is complete). |
---|
[181] | 290 | ; |
---|
| 291 | .readByte1Ready: |
---|
[179] | 292 | in al, dx ; read data byte 1 |
---|
| 293 | |
---|
| 294 | mov ah, al ; store byte in ah for now |
---|
[181] | 295 | |
---|
[179] | 296 | ; |
---|
[181] | 297 | ; note the placement of this reset of dl to bh, and that it is |
---|
| 298 | ; before the return, which is assymetric with where this is done |
---|
| 299 | ; above for byte 1. The value of dl is used by the timeout routine |
---|
| 300 | ; to know which byte to return to (.read_byte1_ready or |
---|
[179] | 301 | ; .read_byte2_ready) |
---|
| 302 | ; |
---|
[181] | 303 | mov dl,bh |
---|
| 304 | |
---|
[179] | 305 | in al,dx |
---|
| 306 | shr al,1 ; data ready (byte 2)? |
---|
| 307 | jnc .readTimeout |
---|
[181] | 308 | .readByte2Ready: |
---|
| 309 | mov dl,bl |
---|
[179] | 310 | in al, dx ; read data byte 2 |
---|
| 311 | |
---|
| 312 | xchg al, ah ; ah was holding byte 1, reverse byte order |
---|
[181] | 313 | |
---|
[179] | 314 | loop .readLoop |
---|
| 315 | |
---|
[181] | 316 | sti ; interrupts back on ASAP, if we turned them off |
---|
| 317 | |
---|
[179] | 318 | ; |
---|
| 319 | ; Compare checksums |
---|
[181] | 320 | ; |
---|
[179] | 321 | xor bp,si |
---|
| 322 | cmp ax,bp |
---|
| 323 | jnz SerialCommand_OutputWithParameters_Error |
---|
| 324 | |
---|
[181] | 325 | |
---|
[179] | 326 | ;---------------------------------------------------------------------- |
---|
[181] | 327 | ; |
---|
[179] | 328 | ; Clear read buffer |
---|
| 329 | ; |
---|
| 330 | ; In case there are extra characters or an error in the FIFO, clear it out. |
---|
[181] | 331 | ; In theory the initialization of the UART registers above should have |
---|
[179] | 332 | ; taken care of this, but I have seen cases where this is not true. |
---|
| 333 | ; |
---|
| 334 | .clearBuffer: |
---|
[181] | 335 | mov dl,bh |
---|
[179] | 336 | in al,dx |
---|
[181] | 337 | mov dl,bl |
---|
[179] | 338 | test al,08fh |
---|
| 339 | jz .clearBufferComplete |
---|
| 340 | shr al,1 |
---|
[181] | 341 | in al,dx |
---|
[179] | 342 | jc .clearBuffer ; note CF from shr above |
---|
| 343 | jmp SerialCommand_OutputWithParameters_Error |
---|
[181] | 344 | |
---|
| 345 | .clearBufferComplete: |
---|
[179] | 346 | pop ax ; sector count and command byte |
---|
| 347 | dec al ; decrememnt sector count |
---|
| 348 | push ax ; save |
---|
| 349 | jz SerialCommand_OutputWithParameters_ReturnCodeInALCF ; CF clear from .clearBuffer test above |
---|
[181] | 350 | |
---|
[179] | 351 | cli ; interrupts back off for ACK byte to host |
---|
| 352 | ; (host could start sending data immediately) |
---|
| 353 | out dx,al ; ACK with next sector number |
---|
[181] | 354 | |
---|
[179] | 355 | jmp .nextSector ; all is well, time for next sector |
---|
| 356 | |
---|
| 357 | ;--------------------------------------------------------------------------- |
---|
| 358 | ; |
---|
| 359 | ; Cleanup, error reporting, and exit |
---|
| 360 | ; |
---|
[181] | 361 | |
---|
| 362 | ; |
---|
[179] | 363 | ; Used in situations where a call is underway, such as with SerialCommand_WaitAndPoll |
---|
[181] | 364 | ; |
---|
[179] | 365 | SerialCommand_OutputWithParameters_ErrorAndPop2Words: |
---|
| 366 | pop ax |
---|
| 367 | pop ax |
---|
| 368 | |
---|
[181] | 369 | SerialCommand_OutputWithParameters_Error: |
---|
| 370 | stc |
---|
[179] | 371 | mov al,1 |
---|
| 372 | |
---|
[181] | 373 | SerialCommand_OutputWithParameters_ReturnCodeInALCF: |
---|
| 374 | sti |
---|
[179] | 375 | mov ah,al |
---|
| 376 | |
---|
| 377 | pop bp ; recover ax from stack, throw away |
---|
| 378 | |
---|
| 379 | pop es |
---|
| 380 | pop bp |
---|
| 381 | pop di |
---|
| 382 | pop si |
---|
| 383 | |
---|
| 384 | ret |
---|
| 385 | |
---|
[150] | 386 | ;-------------------------------------------------------------------- |
---|
[179] | 387 | ; SerialCommand_WaitAndPoll |
---|
| 388 | ; |
---|
| 389 | ; Parameters: |
---|
| 390 | ; BH: UART_LineStatus bit to test (20h for write, or 1h for read) |
---|
| 391 | ; DX: Port address (OK if already incremented to UART_lineStatus) |
---|
| 392 | ; Stack: 2 words on the stack below the command/count word |
---|
| 393 | ; Returns: |
---|
| 394 | ; Returns when desired UART_LineStatus bit is cleared |
---|
| 395 | ; Jumps directly to error exit if timeout elapses (and cleans up stack) |
---|
[181] | 396 | ; Corrupts registers: |
---|
[179] | 397 | ; CX, flags |
---|
| 398 | ;-------------------------------------------------------------------- |
---|
| 399 | |
---|
| 400 | SerialCommand_WaitAndPoll_SoftDelayTicks EQU 20 |
---|
| 401 | |
---|
[181] | 402 | ALIGN JUMP_ALIGN |
---|
[179] | 403 | SerialCommand_WaitAndPoll_Init: |
---|
| 404 | mov cl,SerialCommand_WaitAndPoll_SoftDelayTicks |
---|
| 405 | call Timer_InitializeTimeoutWithTicksInCL |
---|
| 406 | ; fall-through |
---|
[181] | 407 | |
---|
[179] | 408 | SerialCommand_WaitAndPoll: |
---|
| 409 | call Timer_SetCFifTimeout |
---|
| 410 | jc SerialCommand_OutputWithParameters_ErrorAndPop2Words |
---|
| 411 | push dx |
---|
| 412 | push ax |
---|
| 413 | or dl,SerialCommand_UART_lineStatus |
---|
| 414 | in al,dx |
---|
| 415 | test al,bh |
---|
| 416 | pop ax |
---|
| 417 | pop dx |
---|
| 418 | jz SerialCommand_WaitAndPoll |
---|
| 419 | ; fall-through |
---|
[181] | 420 | |
---|
| 421 | SerialCommand_WaitAndPoll_Done: |
---|
[179] | 422 | ret |
---|
| 423 | |
---|
| 424 | ;-------------------------------------------------------------------- |
---|
| 425 | ; SerialCommand_WriteProtocol |
---|
| 426 | ; |
---|
| 427 | ; Parameters: |
---|
| 428 | ; ES:DI: Ptr to buffer |
---|
| 429 | ; BL: Words to write (1-255, or 0=256) |
---|
| 430 | ; BP/SI: Initialized for Checksum (-1 in each) |
---|
| 431 | ; DX: I/O Port |
---|
| 432 | ; Returns: |
---|
| 433 | ; BP/SI: Checksum for written bytes, compared against ACK from server in .readLoop |
---|
| 434 | ; Corrupts registers: |
---|
| 435 | ; AX, BX, CX, DI |
---|
| 436 | ;-------------------------------------------------------------------- |
---|
[150] | 437 | ALIGN JUMP_ALIGN |
---|
[179] | 438 | SerialCommand_WriteProtocol: |
---|
| 439 | mov bh,20h |
---|
[181] | 440 | |
---|
[179] | 441 | .writeLoop: |
---|
| 442 | test bh,1 |
---|
| 443 | jnz SerialCommand_WaitAndPoll_Done |
---|
[181] | 444 | |
---|
[179] | 445 | mov ax,[es:di] ; fetch next word |
---|
| 446 | inc di |
---|
| 447 | inc di |
---|
[181] | 448 | |
---|
[179] | 449 | add bp,ax ; update checksum |
---|
| 450 | adc bp,0 |
---|
| 451 | add si,bp |
---|
| 452 | adc si,0 |
---|
[150] | 453 | |
---|
[179] | 454 | .writeLoopChecksum: |
---|
| 455 | call SerialCommand_WaitAndPoll_Init |
---|
[181] | 456 | |
---|
[179] | 457 | out dx,al ; output first byte |
---|
[150] | 458 | |
---|
[179] | 459 | call SerialCommand_WaitAndPoll |
---|
[181] | 460 | |
---|
[179] | 461 | mov al,ah ; output second byte |
---|
| 462 | out dx,al |
---|
| 463 | |
---|
| 464 | dec bl |
---|
| 465 | jnz .writeLoop |
---|
[181] | 466 | |
---|
[179] | 467 | inc bh |
---|
[181] | 468 | |
---|
[179] | 469 | mov ax,bp ; merge checksum for possible write (last loop) |
---|
[181] | 470 | xor ax,si |
---|
| 471 | |
---|
[179] | 472 | jmp .writeLoopChecksum |
---|
| 473 | |
---|
| 474 | |
---|
| 475 | ;-------------------------------------------------------------------- |
---|
| 476 | ; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH |
---|
| 477 | ; Parameters: |
---|
| 478 | ; BH: Drive Select byte for Drive and Head Select Register |
---|
| 479 | ; DS: Segment to RAMVARS |
---|
| 480 | ; ES:SI: Ptr to buffer to receive 512-byte IDE Information |
---|
| 481 | ; CS:BP: Ptr to IDEVARS |
---|
| 482 | ; Returns: |
---|
| 483 | ; AH: INT 13h Error Code |
---|
[203] | 484 | ; NOTE: Not set (or checked) during drive detection |
---|
[179] | 485 | ; CF: Cleared if success, Set if error |
---|
| 486 | ; Corrupts registers: |
---|
| 487 | ; AL, BL, CX, DX, SI, DI, ES |
---|
| 488 | ;-------------------------------------------------------------------- |
---|
| 489 | ALIGN JUMP_ALIGN |
---|
| 490 | SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH: |
---|
[203] | 491 | ; |
---|
| 492 | ; To improve boot time, we do our best to avoid looking for slave serial drives when we already know the results |
---|
| 493 | ; from the looking for a master. This is particuarly true when doing a COM port scan, as we will end up running |
---|
| 494 | ; through all the COM ports and baud rates a second time. |
---|
| 495 | ; |
---|
| 496 | ; But drive detection isn't the only case - we also need to get the right drive when called on int13h/25h. |
---|
| 497 | ; |
---|
| 498 | ; The decision tree: |
---|
| 499 | ; |
---|
| 500 | ; Master: |
---|
| 501 | ; bSerialPackedPortAndBaud Non-Zero: -> Continue with bSerialPackedAndBaud (1) |
---|
| 502 | ; bSerialPackedPortAndBaud Zero: |
---|
| 503 | ; bLastSerial Zero: -> Scan (2) |
---|
| 504 | ; bLastSerial Non-Zero: -> Continue with bLastSerial (3) |
---|
| 505 | ; |
---|
| 506 | ; Slave: |
---|
| 507 | ; bSerialPackedPortAndBaud Non-Zero: |
---|
| 508 | ; bLastSerial Zero: -> Error - Not Found (4) |
---|
| 509 | ; bLastSerial Non-Zero: -> Continue with bSerialPackedAndBaud (5) |
---|
| 510 | ; bSerialPackedPortAndBaud Zero: |
---|
| 511 | ; bLastSerial Zero: -> Error - Not Found (4) |
---|
| 512 | ; bLastSerial Non-Zero: -> Continue with bLastSerial (6) |
---|
| 513 | ; |
---|
| 514 | ; (1) This was a port/baud that was explicilty set with the configurator. In the drive detection case, as this |
---|
| 515 | ; is the Master, we are checking out a new controller, and so don't care about the value of bLastSerial. |
---|
| 516 | ; And as with the int13h/25h case, we just go off and get the needed information using the user's setting. |
---|
| 517 | ; (2) We are using the special .ideVarsSerialAuto strucutre. During drive detection, we would only be here |
---|
| 518 | ; if bLastSerial is zero (since we only scan if no explicit drives are set), so we go off to scan. |
---|
| 519 | ; (3) We are using the special .ideVarsSerialAuto strucutre. We won't get here during drive detection, but |
---|
| 520 | ; we might get here on an int13h/25h call. If we have scanned COM drives, they are the ONLY serial drives |
---|
| 521 | ; in use, and so bLastSerial will reflect the port/baud setting for the scanned COM drives. |
---|
| 522 | ; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time, |
---|
| 523 | ; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we |
---|
| 524 | ; will scan for a slave even if a master is not present. Note that if ANY master had been previously found, |
---|
| 525 | ; we will do the slave scan, which isn't harmful, it just wates time. But the most common case (by a wide |
---|
| 526 | ; margin) will be just one serial controller. |
---|
| 527 | ; (5) A COM port scan for a master had been previously completed, and a drive was found. In a multiple serial |
---|
| 528 | ; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud |
---|
| 529 | ; to make sure we get the proper drive. |
---|
| 530 | ; (6) A COM port scan for a master had been previously completed, and a drive was found. We would only get here |
---|
| 531 | ; if no serial drive was explicitly set by the user in the configurator or that drive had not been found. |
---|
| 532 | ; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the |
---|
| 533 | ; master scan. |
---|
| 534 | ; |
---|
| 535 | mov dl,[cs:bp+IDEVARS.bSerialPackedPortAndBaud] |
---|
| 536 | mov al, byte [RAMVARS.xlateVars+XLATEVARS.bLastSerial] |
---|
| 537 | |
---|
| 538 | test bh, FLG_DRVNHEAD_DRV |
---|
| 539 | jz .master |
---|
[179] | 540 | |
---|
[203] | 541 | test al,al ; Take care of the case that is different between master and slave. |
---|
| 542 | jz .error ; Because we do this here, the jz after the "or" below will not be taken |
---|
| 543 | |
---|
| 544 | ; fall-through |
---|
| 545 | .master: |
---|
[196] | 546 | test dl,dl |
---|
[203] | 547 | jnz .identifyDeviceInDL |
---|
[179] | 548 | |
---|
[203] | 549 | or dl,al ; Move bLast into position in dl, as well as test for zero |
---|
| 550 | jz .scanSerial |
---|
[199] | 551 | |
---|
[179] | 552 | ; fall-through |
---|
[203] | 553 | .identifyDeviceInDL: |
---|
[179] | 554 | |
---|
| 555 | push bp ; setup fake IDEREGS_AND_INTPACK |
---|
| 556 | |
---|
| 557 | push dx |
---|
| 558 | |
---|
| 559 | mov cl,1 ; 1 sector to move |
---|
| 560 | push cx |
---|
| 561 | |
---|
| 562 | mov bl,0a0h ; protocol command to ah and onto stack with bh |
---|
| 563 | mov ah,bl |
---|
[181] | 564 | |
---|
[179] | 565 | push bx |
---|
| 566 | |
---|
| 567 | mov bp,sp |
---|
| 568 | call SerialCommand_OutputWithParameters_DeviceInDL |
---|
| 569 | |
---|
| 570 | pop bx |
---|
[181] | 571 | |
---|
| 572 | pop cx |
---|
[179] | 573 | pop dx |
---|
| 574 | |
---|
| 575 | pop bp |
---|
[203] | 576 | ; |
---|
| 577 | ; place packed port/baud in RAMVARS, read by FinalizeDPT and DetectDrives |
---|
| 578 | ; |
---|
| 579 | ; Note that this will be set during an int13h/25h call as well. Which is OK since it is only used (at the |
---|
| 580 | ; top of this routine) for drives found during a COM scan, and we only COM scan if there were no other |
---|
| 581 | ; COM drives found. So we will only reaffirm the port/baud for the one COM port/baud that has a drive. |
---|
| 582 | ; |
---|
| 583 | jc .notFound ; only store bLastSerial if success |
---|
| 584 | mov byte [RAMVARS.xlateVars+XLATEVARS.bLastSerial], dl |
---|
[179] | 585 | |
---|
[203] | 586 | .notFound: |
---|
[179] | 587 | ret |
---|
| 588 | |
---|
| 589 | ;---------------------------------------------------------------------- |
---|
| 590 | ; |
---|
| 591 | ; SerialCommand_AutoSerial |
---|
| 592 | ; |
---|
| 593 | ; When the SerialAuto IDEVARS entry is used, scans the COM ports on the machine for a possible serial connection. |
---|
[181] | 594 | ; |
---|
| 595 | |
---|
[203] | 596 | .scanPortAddresses: db DEVICE_SERIAL_COM7 >> 2 |
---|
| 597 | db DEVICE_SERIAL_COM6 >> 2 |
---|
| 598 | db DEVICE_SERIAL_COM5 >> 2 |
---|
| 599 | db DEVICE_SERIAL_COM4 >> 2 |
---|
| 600 | db DEVICE_SERIAL_COM3 >> 2 |
---|
| 601 | db DEVICE_SERIAL_COM2 >> 2 |
---|
| 602 | db DEVICE_SERIAL_COM1 >> 2 |
---|
| 603 | db 0 |
---|
[179] | 604 | |
---|
[181] | 605 | ALIGN JUMP_ALIGN |
---|
[203] | 606 | .scanSerial: |
---|
| 607 | mov di,.scanPortAddresses-1 |
---|
[181] | 608 | |
---|
[179] | 609 | .nextPort: |
---|
| 610 | inc di ; load next port address |
---|
| 611 | mov dl,[cs:di] |
---|
[181] | 612 | |
---|
[179] | 613 | mov dh,0 ; shift from one byte to two |
---|
[181] | 614 | eSHL_IM dx, 2 |
---|
[203] | 615 | jz .error |
---|
[179] | 616 | |
---|
| 617 | ; |
---|
| 618 | ; Test for COM port presence, write to and read from registers |
---|
[181] | 619 | ; |
---|
| 620 | push dx |
---|
[179] | 621 | add dl,SerialCommand_UART_lineControl |
---|
| 622 | mov al, 09ah |
---|
| 623 | out dx, al |
---|
| 624 | in al, dx |
---|
| 625 | pop dx |
---|
| 626 | cmp al, 09ah |
---|
[181] | 627 | jnz .nextPort |
---|
[179] | 628 | |
---|
| 629 | mov al, 0ch |
---|
| 630 | out dx, al |
---|
| 631 | in al, dx |
---|
| 632 | cmp al, 0ch |
---|
| 633 | jnz .nextPort |
---|
| 634 | |
---|
| 635 | ; |
---|
| 636 | ; Pack into dl, baud rate starts at 0 |
---|
[181] | 637 | ; |
---|
[199] | 638 | add dx,-(DEVICE_SERIAL_PACKEDPORTANDBAUD_STARTINGPORT) |
---|
| 639 | shr dx,1 ; dh is zero at this point, and will be sent to the server, |
---|
| 640 | ; so we know this is an auto detect |
---|
[181] | 641 | |
---|
[179] | 642 | jmp .testFirstBaud |
---|
| 643 | |
---|
| 644 | ; |
---|
| 645 | ; Walk through 4 possible baud rates |
---|
[181] | 646 | ; |
---|
| 647 | .nextBaud: |
---|
[179] | 648 | inc dx |
---|
| 649 | test dl,3 |
---|
| 650 | jz .nextPort |
---|
[181] | 651 | |
---|
| 652 | .testFirstBaud: |
---|
[203] | 653 | call .identifyDeviceInDL |
---|
[179] | 654 | jc .nextBaud |
---|
| 655 | |
---|
| 656 | ret |
---|
[181] | 657 | |
---|
[203] | 658 | .error: |
---|
[181] | 659 | stc |
---|
[203] | 660 | ; mov ah,1 ; setting the error code is unnecessary as this path can only be taken during |
---|
| 661 | ; drive detection, and drive detection works off CF and does not check AH |
---|
| 662 | ret |
---|
[179] | 663 | |
---|
[203] | 664 | |
---|