1 | ; Project name : XTIDE Universal BIOS
|
---|
2 | ; Description : IDE Device transfer functions.
|
---|
3 |
|
---|
4 | ; Structure containing variables for PIO transfer functions.
|
---|
5 | ; This struct must not be larger than IDEPACK without INTPACK.
|
---|
6 | struc PIOVARS
|
---|
7 | .wWordsInBlock resb 2 ; 0, Block size in WORDs
|
---|
8 | .wWordsLeft resb 2 ; 2, WORDs left to transfer
|
---|
9 | .wWordsDone resb 2 ; 4, Number of sectors xferred
|
---|
10 | resb 1 ; 6,
|
---|
11 | resb 1 ; 7, IDEPACK.bDeviceControl
|
---|
12 | .wDataPort resb 2 ; 8, IDE Data Port
|
---|
13 | .fnXfer resb 2 ; 10, Offset to transfer function
|
---|
14 | endstruc
|
---|
15 |
|
---|
16 |
|
---|
17 | ; Section containing code
|
---|
18 | SECTION .text
|
---|
19 |
|
---|
20 | ;--------------------------------------------------------------------
|
---|
21 | ; IdeTransfer_StartWithCommandInAL
|
---|
22 | ; Parameters:
|
---|
23 | ; AL: IDE command that was used to start the transfer
|
---|
24 | ; (all PIO read and write commands including Identify Device)
|
---|
25 | ; ES:SI: Ptr to normalized data buffer
|
---|
26 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
27 | ; SS:BP: Ptr to IDEPACK
|
---|
28 | ; Returns:
|
---|
29 | ; AH: INT 13h Error Code
|
---|
30 | ; CX: Number of successfully transferred sectors
|
---|
31 | ; CF: Cleared if success, Set if error
|
---|
32 | ; Corrupts registers:
|
---|
33 | ; AL, BX, DX, SI, ES
|
---|
34 | ;--------------------------------------------------------------------
|
---|
35 | ALIGN JUMP_ALIGN
|
---|
36 | IdeTransfer_StartWithCommandInAL:
|
---|
37 | mov ah, [bp+IDEPACK.bSectorCount]
|
---|
38 |
|
---|
39 | ; Are we reading or writing?
|
---|
40 | test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
|
---|
41 | jnz SHORT .PrepareToWriteDataFromESSI
|
---|
42 | cmp al, COMMAND_WRITE_MULTIPLE
|
---|
43 | je SHORT .PrepareToWriteDataFromESSI
|
---|
44 |
|
---|
45 | ; Prepare to read data to ESSI
|
---|
46 | mov bx, g_rgfnPioRead
|
---|
47 | call InitializePiovarsInSSBPwithSectorCountInAH
|
---|
48 | xchg si, di
|
---|
49 | jmp SHORT ReadFromDrive
|
---|
50 |
|
---|
51 | ALIGN JUMP_ALIGN
|
---|
52 | .PrepareToWriteDataFromESSI:
|
---|
53 | mov bx, g_rgfnPioWrite
|
---|
54 | call InitializePiovarsInSSBPwithSectorCountInAH
|
---|
55 | ; Fall to WriteToDrive
|
---|
56 |
|
---|
57 |
|
---|
58 | ;--------------------------------------------------------------------
|
---|
59 | ; WriteToDrive
|
---|
60 | ; Parameters:
|
---|
61 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
62 | ; ES:SI: Normalized ptr to buffer containing data
|
---|
63 | ; SS:BP: Ptr to PIOVARS
|
---|
64 | ; Returns:
|
---|
65 | ; AH: BIOS Error code
|
---|
66 | ; CX: Number of successfully transferred sectors
|
---|
67 | ; CF: 0 if transfer succesfull
|
---|
68 | ; 1 if any error
|
---|
69 | ; Corrupts registers:
|
---|
70 | ; AL, BX, DX, SI, ES
|
---|
71 | ;--------------------------------------------------------------------
|
---|
72 | WriteToDrive:
|
---|
73 | ; Always poll when writing first block (IRQs are generated for following blocks)
|
---|
74 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
|
---|
75 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
|
---|
76 | jc SHORT ReturnWithTransferErrorInAH
|
---|
77 |
|
---|
78 | ALIGN JUMP_ALIGN
|
---|
79 | .WriteNextBlockToDrive:
|
---|
80 | mov cx, [bp+PIOVARS.wWordsInBlock]
|
---|
81 | mov dx, [bp+PIOVARS.wDataPort]
|
---|
82 | cmp [bp+PIOVARS.wWordsLeft], cx
|
---|
83 | jbe SHORT .WriteLastBlockToDrive
|
---|
84 | call [bp+PIOVARS.fnXfer]
|
---|
85 |
|
---|
86 | ; Wait until ready for next block and check for errors
|
---|
87 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
|
---|
88 | jc SHORT ReturnWithTransferErrorInAH
|
---|
89 |
|
---|
90 | ; Increment number of successfully written WORDs
|
---|
91 | mov ax, [bp+PIOVARS.wWordsInBlock]
|
---|
92 | sub [bp+PIOVARS.wWordsLeft], ax
|
---|
93 | add [bp+PIOVARS.wWordsDone], ax
|
---|
94 | jmp SHORT .WriteNextBlockToDrive
|
---|
95 |
|
---|
96 | ALIGN JUMP_ALIGN
|
---|
97 | .WriteLastBlockToDrive:
|
---|
98 | mov cx, [bp+PIOVARS.wWordsLeft]
|
---|
99 | %ifdef USE_186
|
---|
100 | push CheckErrorsAfterTransferringLastBlock
|
---|
101 | jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
|
---|
102 | %else
|
---|
103 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
|
---|
104 | jmp SHORT CheckErrorsAfterTransferringLastBlock
|
---|
105 | %endif
|
---|
106 |
|
---|
107 |
|
---|
108 | ;--------------------------------------------------------------------
|
---|
109 | ; ReadFromDrive
|
---|
110 | ; Parameters:
|
---|
111 | ; ES:DI: Normalized ptr to buffer to recieve data
|
---|
112 | ; DS:SI: Ptr to DPT (in RAMVARS segment)
|
---|
113 | ; SS:BP: Ptr to PIOVARS
|
---|
114 | ; Returns:
|
---|
115 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
116 | ; AH: BIOS Error code
|
---|
117 | ; CX: Number of successfully transferred sectors
|
---|
118 | ; CF: 0 if transfer succesfull
|
---|
119 | ; 1 if any error
|
---|
120 | ; Corrupts registers:
|
---|
121 | ; AL, BX, DX, SI, ES
|
---|
122 | ;--------------------------------------------------------------------
|
---|
123 | ALIGN JUMP_ALIGN
|
---|
124 | ReadFromDrive:
|
---|
125 | ; Wait until drive is ready to transfer
|
---|
126 | xchg di, si ; DS:DI now points DPT
|
---|
127 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
|
---|
128 | jc SHORT ReturnWithTransferErrorInAH
|
---|
129 | xchg si, di ; ES:DI now points buffer
|
---|
130 |
|
---|
131 | ALIGN JUMP_ALIGN
|
---|
132 | .ReadNextBlockFromDrive:
|
---|
133 | mov cx, [bp+PIOVARS.wWordsInBlock]
|
---|
134 | mov dx, [bp+PIOVARS.wDataPort]
|
---|
135 | cmp [bp+PIOVARS.wWordsLeft], cx
|
---|
136 | jbe SHORT .ReadLastBlockFromDrive
|
---|
137 | call [bp+PIOVARS.fnXfer]
|
---|
138 |
|
---|
139 | ; Wait until ready for next block and check for errors
|
---|
140 | xchg di, si ; DS:DI now points DPT
|
---|
141 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
|
---|
142 | jc SHORT ReturnWithTransferErrorInAH
|
---|
143 | xchg si, di ; ES:DI now points buffer
|
---|
144 |
|
---|
145 | ; Increment number of successfully read WORDs
|
---|
146 | mov ax, [bp+PIOVARS.wWordsInBlock]
|
---|
147 | sub [bp+PIOVARS.wWordsLeft], ax
|
---|
148 | add [bp+PIOVARS.wWordsDone], ax
|
---|
149 | jmp SHORT .ReadNextBlockFromDrive
|
---|
150 |
|
---|
151 | ALIGN JUMP_ALIGN
|
---|
152 | .ReadLastBlockFromDrive:
|
---|
153 | mov cx, [bp+PIOVARS.wWordsLeft]
|
---|
154 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
|
---|
155 |
|
---|
156 | ; Check for errors in last block
|
---|
157 | mov di, si ; DS:DI now points DPT
|
---|
158 | CheckErrorsAfterTransferringLastBlock:
|
---|
159 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
|
---|
160 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
|
---|
161 |
|
---|
162 | ; Return number of successfully read sectors
|
---|
163 | ReturnWithTransferErrorInAH:
|
---|
164 | mov cx, [bp+PIOVARS.wWordsDone]
|
---|
165 | jc SHORT .ConvertTransferredWordsInCXtoSectors
|
---|
166 | add cx, [bp+PIOVARS.wWordsLeft] ; Never sets CF
|
---|
167 | .ConvertTransferredWordsInCXtoSectors:
|
---|
168 | xchg cl, ch
|
---|
169 | ret
|
---|
170 |
|
---|
171 |
|
---|
172 | ;--------------------------------------------------------------------
|
---|
173 | ; InitializePiovarsInSSBPwithSectorCountInAH
|
---|
174 | ; Parameters:
|
---|
175 | ; AH: Number of sectors to transfer (1...128)
|
---|
176 | ; BX: Offset to transfer function lookup table
|
---|
177 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
178 | ; SS:BP: Ptr to PIOVARS
|
---|
179 | ; Returns:
|
---|
180 | ; Nothing
|
---|
181 | ; Corrupts registers:
|
---|
182 | ; AX, BX, CX, DX
|
---|
183 | ;--------------------------------------------------------------------
|
---|
184 | ALIGN JUMP_ALIGN
|
---|
185 | InitializePiovarsInSSBPwithSectorCountInAH:
|
---|
186 | ; Store sizes
|
---|
187 | xor al, al
|
---|
188 | mov [bp+PIOVARS.wWordsLeft], ax
|
---|
189 | cbw
|
---|
190 | mov [bp+PIOVARS.wWordsDone], ax ; Zero
|
---|
191 | mov ah, [di+DPT_ATA.bSetBlock]
|
---|
192 | mov [bp+PIOVARS.wWordsInBlock], ax
|
---|
193 |
|
---|
194 | ; Get transfer function based on bus type
|
---|
195 | xchg ax, bx ; Lookup table offset to AX
|
---|
196 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS
|
---|
197 | mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address
|
---|
198 | mov bl, [cs:bx+IDEVARS.bDevice] ; Load device type to BX
|
---|
199 | add bx, ax
|
---|
200 | mov ax, [cs:bx] ; Load offset to transfer function
|
---|
201 | mov [bp+PIOVARS.wDataPort], dx
|
---|
202 | mov [bp+PIOVARS.fnXfer], ax
|
---|
203 | ret
|
---|
204 |
|
---|
205 |
|
---|
206 | ;--------------------------------------------------------------------
|
---|
207 | ; DualByteReadForXtide Dual port 8-bit XTIDE PIO read transfer
|
---|
208 | ; SingleByteRead Single port 8-bit PIO read transfer
|
---|
209 | ; WordReadForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer
|
---|
210 | ; WordReadForXTplusAndAT Normal 16-bit IDE PIO read transfer
|
---|
211 | ; DWordRead VLB/PCI 32-bit IDE PIO read transfer
|
---|
212 | ; Parameters:
|
---|
213 | ; CX: Block size in WORDs
|
---|
214 | ; DX: IDE Data port address
|
---|
215 | ; ES:DI: Normalized ptr to buffer to recieve data
|
---|
216 | ; Returns:
|
---|
217 | ; Nothing
|
---|
218 | ; Corrupts registers:
|
---|
219 | ; AX, BX, CX
|
---|
220 | ;--------------------------------------------------------------------
|
---|
221 | ALIGN JUMP_ALIGN
|
---|
222 | DualByteReadForXtide:
|
---|
223 | eSHR_IM cx, 2 ; Loop unrolling
|
---|
224 | mov bx, 8 ; Bit mask for toggling data low/high reg
|
---|
225 | ALIGN JUMP_ALIGN
|
---|
226 | .InswLoop:
|
---|
227 | XTIDE_INSW
|
---|
228 | XTIDE_INSW
|
---|
229 | XTIDE_INSW
|
---|
230 | XTIDE_INSW
|
---|
231 | loop .InswLoop
|
---|
232 | ret
|
---|
233 |
|
---|
234 | ;----
|
---|
235 | ALIGN JUMP_ALIGN
|
---|
236 | SingleByteRead:
|
---|
237 | %ifdef USE_186 ; INS instruction available
|
---|
238 | shl cx, 1 ; WORD count to BYTE count
|
---|
239 | rep insb
|
---|
240 | %else ; If 8088/8086
|
---|
241 | shr cx, 1 ; WORD count to DWORD count
|
---|
242 | ALIGN JUMP_ALIGN
|
---|
243 | .InsdLoop:
|
---|
244 | in al, dx
|
---|
245 | stosb ; Store to [ES:DI]
|
---|
246 | in al, dx
|
---|
247 | stosb
|
---|
248 | in al, dx
|
---|
249 | stosb
|
---|
250 | in al, dx
|
---|
251 | stosb
|
---|
252 | loop .InsdLoop
|
---|
253 | %endif
|
---|
254 | ret
|
---|
255 |
|
---|
256 | ;----
|
---|
257 | %ifndef USE_186
|
---|
258 | ALIGN JUMP_ALIGN
|
---|
259 | WordReadForXTIDEmod:
|
---|
260 | times 2 shr cx, 1 ; WORD count to QWORD count
|
---|
261 | ALIGN JUMP_ALIGN
|
---|
262 | .ReadNextQword:
|
---|
263 | in ax, dx ; Read 1st WORD
|
---|
264 | stosw ; Store 1st WORD to [ES:DI]
|
---|
265 | in ax, dx
|
---|
266 | stosw ; 2nd
|
---|
267 | in ax, dx
|
---|
268 | stosw ; 3rd
|
---|
269 | in ax, dx
|
---|
270 | stosw ; 4th
|
---|
271 | loop .ReadNextQword
|
---|
272 | ret
|
---|
273 | %endif
|
---|
274 |
|
---|
275 | ;----
|
---|
276 | ALIGN JUMP_ALIGN
|
---|
277 | WordReadForXTplusAndAT:
|
---|
278 | rep
|
---|
279 | db 6Dh ; INSW (we want this in XT build)
|
---|
280 | ret
|
---|
281 |
|
---|
282 | ;----
|
---|
283 | ALIGN JUMP_ALIGN
|
---|
284 | DWordRead:
|
---|
285 | shr cx, 1 ; WORD count to DWORD count
|
---|
286 | rep
|
---|
287 | db 66h ; Override operand size to 32-bit
|
---|
288 | db 6Dh ; INSW/INSD
|
---|
289 | ret
|
---|
290 |
|
---|
291 |
|
---|
292 | ;--------------------------------------------------------------------
|
---|
293 | ; DualByteWriteForXtide Dual port 8-bit XTIDE PIO write transfer
|
---|
294 | ; SingleByteWrite Single port 8-bit PIO write transfer
|
---|
295 | ; WordWriteForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer
|
---|
296 | ; WordWrite Normal 16-bit IDE PIO write transfer
|
---|
297 | ; DWordWrite VLB/PCI 32-bit IDE PIO write transfer
|
---|
298 | ; Parameters:
|
---|
299 | ; CX: Block size in WORDs
|
---|
300 | ; DX: IDE Data port address
|
---|
301 | ; ES:SI: Normalized ptr to buffer containing data
|
---|
302 | ; Returns:
|
---|
303 | ; Nothing
|
---|
304 | ; Corrupts registers:
|
---|
305 | ; AX, CX
|
---|
306 | ;--------------------------------------------------------------------
|
---|
307 | ALIGN JUMP_ALIGN
|
---|
308 | DualByteWriteForXtide:
|
---|
309 | push ds
|
---|
310 | push bx
|
---|
311 | eSHR_IM cx, 2 ; Loop unrolling
|
---|
312 | mov bx, 8 ; Bit mask for toggling data low/high reg
|
---|
313 | push es ; Copy ES...
|
---|
314 | pop ds ; ...to DS
|
---|
315 | ALIGN JUMP_ALIGN
|
---|
316 | .OutswLoop:
|
---|
317 | XTIDE_OUTSW
|
---|
318 | XTIDE_OUTSW
|
---|
319 | XTIDE_OUTSW
|
---|
320 | XTIDE_OUTSW
|
---|
321 | loop .OutswLoop
|
---|
322 | pop bx
|
---|
323 | pop ds
|
---|
324 | ret
|
---|
325 |
|
---|
326 | ;----
|
---|
327 | ALIGN JUMP_ALIGN
|
---|
328 | SingleByteWrite:
|
---|
329 | %ifdef USE_186 ; OUTS instruction available
|
---|
330 | shl cx, 1 ; WORD count to BYTE count
|
---|
331 | es ; Source is ES segment
|
---|
332 | rep outsb
|
---|
333 | %else ; If 8088/8086
|
---|
334 | shr cx, 1 ; WORD count to DWORD count
|
---|
335 | push ds ; Store DS
|
---|
336 | push es ; Copy ES...
|
---|
337 | pop ds ; ...to DS
|
---|
338 | ALIGN JUMP_ALIGN
|
---|
339 | .OutsdLoop:
|
---|
340 | lodsb ; Load from [DS:SI] to AL
|
---|
341 | out dx, al
|
---|
342 | lodsb
|
---|
343 | out dx, al
|
---|
344 | lodsb
|
---|
345 | out dx, al
|
---|
346 | lodsb
|
---|
347 | out dx, al
|
---|
348 | loop .OutsdLoop
|
---|
349 | pop ds ; Restore DS
|
---|
350 | %endif
|
---|
351 | ret
|
---|
352 |
|
---|
353 | ;---
|
---|
354 | ALIGN JUMP_ALIGN
|
---|
355 | WordWriteForXTIDEmod:
|
---|
356 | push ds
|
---|
357 | eSHR_IM cx, 2 ; Loop unrolling
|
---|
358 | push es ; Copy ES...
|
---|
359 | pop ds ; ...to DS
|
---|
360 | ALIGN JUMP_ALIGN
|
---|
361 | .WriteNextQword:
|
---|
362 | XTIDE_MOD_OUTSW
|
---|
363 | XTIDE_MOD_OUTSW
|
---|
364 | XTIDE_MOD_OUTSW
|
---|
365 | XTIDE_MOD_OUTSW
|
---|
366 | loop .WriteNextQword
|
---|
367 | pop ds
|
---|
368 | ret
|
---|
369 |
|
---|
370 | ;----
|
---|
371 | ALIGN JUMP_ALIGN
|
---|
372 | WordWrite:
|
---|
373 | es ; Source is ES segment
|
---|
374 | rep
|
---|
375 | db 6Fh ; OUTSW (we want this in XT build)
|
---|
376 | ret
|
---|
377 |
|
---|
378 | ALIGN JUMP_ALIGN
|
---|
379 | DWordWrite:
|
---|
380 | shr cx, 1 ; WORD count to DWORD count
|
---|
381 | es ; Source is ES segment
|
---|
382 | rep
|
---|
383 | db 66h ; Override operand size to 32-bit
|
---|
384 | db 6Fh ; OUTSW/OUTSD
|
---|
385 | ret
|
---|
386 |
|
---|
387 |
|
---|
388 |
|
---|
389 | ; Lookup tables to get transfer function based on bus type
|
---|
390 | ALIGN WORD_ALIGN
|
---|
391 | g_rgfnPioRead:
|
---|
392 | dw DualByteReadForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE
|
---|
393 | %ifdef USE_186
|
---|
394 | dw WordReadForXTplusAndAT ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0
|
---|
395 | %else
|
---|
396 | dw WordReadForXTIDEmod
|
---|
397 | %endif
|
---|
398 | dw SingleByteRead ; DEVICE_8BIT_SINGLE_PORT
|
---|
399 | dw WordReadForXTplusAndAT ; DEVICE_16BIT_ATA
|
---|
400 | dw DWordRead ; DEVICE_32BIT_ATA
|
---|
401 |
|
---|
402 | g_rgfnPioWrite:
|
---|
403 | dw DualByteWriteForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE
|
---|
404 | dw WordWriteForXTIDEmod ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0
|
---|
405 | dw SingleByteWrite ; DEVICE_8BIT_SINGLE_PORT
|
---|
406 | dw WordWrite ; DEVICE_16BIT_ATA
|
---|
407 | dw DWordWrite ; DEVICE_32BIT_ATA
|
---|