source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm@ 245

Last change on this file since 245 was 242, checked in by krille_n_@…, 13 years ago

Changes:

  • Optimizations (both for size and speed) in IdeTransfer.asm and MemIdeTransfer.asm
  • Fixed a bug where the SingleByteRead/Write functions in IdeTransfer.asm would fail on 128 sector transfers.
  • Fixed some typos and errors in general, comments etc.
File size: 11.2 KB
Line 
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.
6struc 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
14endstruc
15
16
17; Section containing code
18SECTION .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;--------------------------------------------------------------------
35ALIGN JUMP_ALIGN
36IdeTransfer_StartWithCommandInAL:
37 ; Are we reading or writing?
38 test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
39 mov ah, [bp+IDEPACK.bSectorCount]
40 jnz SHORT WriteToDrive
41 cmp al, COMMAND_WRITE_MULTIPLE
42 je SHORT WriteToDrive
43 ; Fall to ReadFromDrive
44
45;--------------------------------------------------------------------
46; ReadFromDrive
47; Parameters:
48; AH: Number of sectors to transfer (1...128)
49; ES:SI: Normalized ptr to buffer to receive data
50; DS:DI: Ptr to DPT (in RAMVARS segment)
51; SS:BP: Ptr to PIOVARS
52; Returns:
53; DS:DI: Ptr to DPT (in RAMVARS segment)
54; AH: BIOS Error code
55; CX: Number of successfully transferred sectors
56; CF: 0 if transfer succesfull
57; 1 if any error
58; Corrupts registers:
59; AL, BX, DX, SI, ES
60;--------------------------------------------------------------------
61ReadFromDrive:
62 ; Prepare to read data to ESSI
63 mov bx, g_rgfnPioRead
64 call InitializePiovarsInSSBPwithSectorCountInAH
65
66 ; Wait until drive is ready to transfer
67 call IdeWait_IRQorDRQ ; Wait until ready to transfer
68 jc SHORT ReturnWithTransferErrorInAH
69 xchg si, di ; ES:DI now points buffer
70
71 mov cx, [bp+PIOVARS.wWordsInBlock]
72
73ALIGN JUMP_ALIGN
74.ReadNextBlockFromDrive:
75 mov dx, [bp+PIOVARS.wDataPort]
76 cmp [bp+PIOVARS.wWordsLeft], cx
77 jbe SHORT .ReadLastBlockFromDrive
78 call [bp+PIOVARS.fnXfer]
79
80 ; Wait until ready for next block and check for errors
81 xchg di, si ; DS:DI now points DPT
82 call IdeWait_IRQorDRQ ; Wait until ready to transfer
83 jc SHORT ReturnWithTransferErrorInAH
84 xchg si, di ; ES:DI now points buffer
85
86 ; Increment number of successfully read WORDs
87 mov cx, [bp+PIOVARS.wWordsInBlock]
88 sub [bp+PIOVARS.wWordsLeft], cx
89 add [bp+PIOVARS.wWordsDone], cx
90 jmp SHORT .ReadNextBlockFromDrive
91
92ALIGN JUMP_ALIGN
93.ReadLastBlockFromDrive:
94 mov cx, [bp+PIOVARS.wWordsLeft]
95 call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
96
97 ; Check for errors in last block
98 mov di, si ; DS:DI now points DPT
99CheckErrorsAfterTransferringLastBlock:
100 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
101 call IdeWait_PollStatusFlagInBLwithTimeoutInBH
102
103 ; Return number of successfully read sectors
104ReturnWithTransferErrorInAH:
105 mov cx, [bp+PIOVARS.wWordsDone]
106 jc SHORT .ConvertTransferredWordsInCXtoSectors
107 add cx, [bp+PIOVARS.wWordsLeft] ; Never sets CF
108.ConvertTransferredWordsInCXtoSectors:
109 xchg cl, ch
110 ret
111
112
113;--------------------------------------------------------------------
114; WriteToDrive
115; Parameters:
116; AH: Number of sectors to transfer (1...128)
117; DS:DI: Ptr to DPT (in RAMVARS segment)
118; ES:SI: Normalized ptr to buffer containing data
119; SS:BP: Ptr to PIOVARS
120; Returns:
121; AH: BIOS Error code
122; CX: Number of successfully transferred sectors
123; CF: 0 if transfer succesfull
124; 1 if any error
125; Corrupts registers:
126; AL, BX, DX, SI, ES
127;--------------------------------------------------------------------
128ALIGN JUMP_ALIGN
129WriteToDrive:
130 ; Prepare to write data from ESSI
131 mov bx, g_rgfnPioWrite
132 call InitializePiovarsInSSBPwithSectorCountInAH
133
134 ; Always poll when writing first block (IRQs are generated for following blocks)
135 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
136 call IdeWait_PollStatusFlagInBLwithTimeoutInBH
137 jc SHORT ReturnWithTransferErrorInAH
138
139 mov cx, [bp+PIOVARS.wWordsInBlock]
140
141ALIGN JUMP_ALIGN
142.WriteNextBlockToDrive:
143 mov dx, [bp+PIOVARS.wDataPort]
144 cmp [bp+PIOVARS.wWordsLeft], cx
145 jbe SHORT .WriteLastBlockToDrive
146 call [bp+PIOVARS.fnXfer]
147
148 ; Wait until ready for next block and check for errors
149 call IdeWait_IRQorDRQ ; Wait until ready to transfer
150 jc SHORT ReturnWithTransferErrorInAH
151
152 ; Increment number of successfully written WORDs
153 mov cx, [bp+PIOVARS.wWordsInBlock]
154 sub [bp+PIOVARS.wWordsLeft], cx
155 add [bp+PIOVARS.wWordsDone], cx
156 jmp SHORT .WriteNextBlockToDrive
157
158ALIGN JUMP_ALIGN
159.WriteLastBlockToDrive:
160 mov cx, [bp+PIOVARS.wWordsLeft]
161%ifdef USE_186
162 push CheckErrorsAfterTransferringLastBlock
163 jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
164%else
165 call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
166 jmp SHORT CheckErrorsAfterTransferringLastBlock
167%endif
168
169
170;--------------------------------------------------------------------
171; InitializePiovarsInSSBPwithSectorCountInAH
172; Parameters:
173; AH: Number of sectors to transfer (1...128)
174; BX: Offset to transfer function lookup table
175; DS:DI: Ptr to DPT (in RAMVARS segment)
176; SS:BP: Ptr to PIOVARS
177; Returns:
178; Nothing
179; Corrupts registers:
180; AX, BX, DX
181;--------------------------------------------------------------------
182ALIGN JUMP_ALIGN
183InitializePiovarsInSSBPwithSectorCountInAH:
184 ; Store sizes
185 xor al, al
186 mov [bp+PIOVARS.wWordsLeft], ax
187 mov ah, [di+DPT_ATA.bSetBlock]
188 mov [bp+PIOVARS.wWordsInBlock], ax
189 cbw
190 mov [bp+PIOVARS.wWordsDone], ax ; Zero
191
192 ; Get transfer function based on bus type
193 xchg ax, bx ; Lookup table offset to AX
194 mov bl, [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS
195 mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address
196 mov bl, [cs:bx+IDEVARS.bDevice] ; Load device type to BX
197 add bx, ax
198 mov [bp+PIOVARS.wDataPort], dx
199 mov ax, [cs:bx] ; Load offset to transfer function
200 mov [bp+PIOVARS.fnXfer], ax
201 ret
202
203
204;--------------------------------------------------------------------
205; DualByteReadForXtide Dual port 8-bit XTIDE PIO read transfer
206; SingleByteRead Single port 8-bit PIO read transfer
207; WordReadForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer
208; WordReadForXTplusAndAT Normal 16-bit IDE PIO read transfer
209; DWordRead VLB/PCI 32-bit IDE PIO read transfer
210; Parameters:
211; CX: Block size in WORDs
212; DX: IDE Data port address
213; ES:DI: Normalized ptr to buffer to receive data
214; Returns:
215; Nothing
216; Corrupts registers:
217; AX, BX, CX
218;--------------------------------------------------------------------
219ALIGN JUMP_ALIGN
220DualByteReadForXtide:
221 eSHR_IM cx, 2 ; Loop unrolling
222 mov bx, 8 ; Bit mask for toggling data low/high reg
223ALIGN JUMP_ALIGN
224.InswLoop:
225 XTIDE_INSW
226 XTIDE_INSW
227 XTIDE_INSW
228 XTIDE_INSW
229 loop .InswLoop
230 ret
231
232;----
233ALIGN JUMP_ALIGN
234SingleByteRead:
235%ifdef USE_186 ; INS instruction available
236 dec cx ; Avoid overflowing CX on a 128 sector transfer
237 shl cx, 1 ; WORD count to BYTE count
238 inc cx
239 rep insb
240 insb
241%else ; If 8088/8086
242 shr cx, 1 ; WORD count to DWORD count
243ALIGN JUMP_ALIGN
244.InsdLoop:
245 in al, dx
246 stosb ; Store to [ES:DI]
247 in al, dx
248 stosb
249 in al, dx
250 stosb
251 in al, dx
252 stosb
253 loop .InsdLoop
254%endif
255 ret
256
257;----
258%ifndef USE_186
259ALIGN JUMP_ALIGN
260WordReadForXTIDEmod:
261 times 2 shr cx, 1 ; WORD count to QWORD count
262ALIGN JUMP_ALIGN
263.ReadNextQword:
264 in ax, dx ; Read 1st WORD
265 stosw ; Store 1st WORD to [ES:DI]
266 in ax, dx
267 stosw ; 2nd
268 in ax, dx
269 stosw ; 3rd
270 in ax, dx
271 stosw ; 4th
272 loop .ReadNextQword
273 ret
274%endif
275
276;----
277ALIGN JUMP_ALIGN
278WordReadForXTplusAndAT:
279 rep
280 db 6Dh ; INSW (we want this in XT build)
281 ret
282
283;----
284ALIGN JUMP_ALIGN
285DWordRead:
286 shr cx, 1 ; WORD count to DWORD count
287 rep
288 db 66h ; Override operand size to 32-bit
289 db 6Dh ; INSW/INSD
290 ret
291
292
293;--------------------------------------------------------------------
294; DualByteWriteForXtide Dual port 8-bit XTIDE PIO write transfer
295; SingleByteWrite Single port 8-bit PIO write transfer
296; WordWriteForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer
297; WordWrite Normal 16-bit IDE PIO write transfer
298; DWordWrite VLB/PCI 32-bit IDE PIO write transfer
299; Parameters:
300; CX: Block size in WORDs
301; DX: IDE Data port address
302; ES:SI: Normalized ptr to buffer containing data
303; Returns:
304; Nothing
305; Corrupts registers:
306; AX, CX
307;--------------------------------------------------------------------
308ALIGN JUMP_ALIGN
309DualByteWriteForXtide:
310 push ds
311 push bx
312 eSHR_IM cx, 2 ; Loop unrolling
313 mov bx, 8 ; Bit mask for toggling data low/high reg
314 push es ; Copy ES...
315 pop ds ; ...to DS
316ALIGN JUMP_ALIGN
317.OutswLoop:
318 XTIDE_OUTSW
319 XTIDE_OUTSW
320 XTIDE_OUTSW
321 XTIDE_OUTSW
322 loop .OutswLoop
323 pop bx
324 pop ds
325 ret
326
327;----
328ALIGN JUMP_ALIGN
329SingleByteWrite:
330%ifdef USE_186 ; OUTS instruction available
331 dec cx ; Avoid overflowing CX on a 128 sector transfer
332 shl cx, 1 ; WORD count to BYTE count
333 inc cx
334 es ; Source is ES segment
335 rep outsb
336 es outsb
337%else ; If 8088/8086
338 shr cx, 1 ; WORD count to DWORD count
339 push ds ; Store DS
340 push es ; Copy ES...
341 pop ds ; ...to DS
342ALIGN JUMP_ALIGN
343.OutsdLoop:
344 lodsb ; Load from [DS:SI] to AL
345 out dx, al
346 lodsb
347 out dx, al
348 lodsb
349 out dx, al
350 lodsb
351 out dx, al
352 loop .OutsdLoop
353 pop ds ; Restore DS
354%endif
355 ret
356
357;---
358ALIGN JUMP_ALIGN
359WordWriteForXTIDEmod:
360 push ds
361 eSHR_IM cx, 2 ; Loop unrolling
362 push es ; Copy ES...
363 pop ds ; ...to DS
364ALIGN JUMP_ALIGN
365.WriteNextQword:
366 XTIDE_MOD_OUTSW
367 XTIDE_MOD_OUTSW
368 XTIDE_MOD_OUTSW
369 XTIDE_MOD_OUTSW
370 loop .WriteNextQword
371 pop ds
372 ret
373
374;----
375ALIGN JUMP_ALIGN
376WordWrite:
377 es ; Source is ES segment
378 rep
379 db 6Fh ; OUTSW (we want this in XT build)
380 ret
381
382ALIGN JUMP_ALIGN
383DWordWrite:
384 shr cx, 1 ; WORD count to DWORD count
385 es ; Source is ES segment
386 rep
387 db 66h ; Override operand size to 32-bit
388 db 6Fh ; OUTSW/OUTSD
389 ret
390
391
392; Lookup tables to get transfer function based on bus type
393ALIGN WORD_ALIGN
394g_rgfnPioRead:
395 dw DualByteReadForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE
396%ifdef USE_186
397 dw WordReadForXTplusAndAT ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0
398%else
399 dw WordReadForXTIDEmod
400%endif
401 dw SingleByteRead ; DEVICE_8BIT_SINGLE_PORT
402 dw WordReadForXTplusAndAT ; DEVICE_16BIT_ATA
403 dw DWordRead ; DEVICE_32BIT_ATA
404
405g_rgfnPioWrite:
406 dw DualByteWriteForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE
407 dw WordWriteForXTIDEmod ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0
408 dw SingleByteWrite ; DEVICE_8BIT_SINGLE_PORT
409 dw WordWrite ; DEVICE_16BIT_ATA
410 dw DWordWrite ; DEVICE_32BIT_ATA
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