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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm@ 319

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Last change on this file since 319 was 294, checked in by krille_n_@…, 13 years ago

Commit 2/2 (BIOS):

Fixed a bug in AH1h_HStatus.asm.
Minor optimizations.
Fixed spelling and did some cleaning.

File size: 11.2 KB

Rev	Line
[150]	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
[218]	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
[223]	10	resb 1 ; 6,
[218]	11	resb 1 ; 7, IDEPACK.bDeviceControl
	12	.wDataPort resb 2 ; 8, IDE Data Port
	13	.fnXfer resb 2 ; 10, Offset to transfer function
[150]	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
[171]	24	; (all PIO read and write commands including Identify Device)
[218]	25	; ES:SI: Ptr to normalized data buffer
[150]	26	; DS:DI: Ptr to DPT (in RAMVARS segment)
	27	; SS:BP: Ptr to IDEPACK
	28	; Returns:
	29	; AH: INT 13h Error Code
[218]	30	; CX: Number of successfully transferred sectors
[150]	31	; CF: Cleared if success, Set if error
	32	; Corrupts registers:
[218]	33	; AL, BX, DX, SI, ES
[150]	34	;--------------------------------------------------------------------
	35	ALIGN JUMP_ALIGN
	36	IdeTransfer_StartWithCommandInAL:
[157]	37	; Are we reading or writing?
[171]	38	test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
[242]	39	mov ah, [bp+IDEPACK.bSectorCount]
	40	jnz SHORT WriteToDrive
[171]	41	cmp al, COMMAND_WRITE_MULTIPLE
[242]	42	je SHORT WriteToDrive
	43	; Fall to ReadFromDrive
[150]	44
	45	;--------------------------------------------------------------------
[242]	46	; ReadFromDrive
[150]	47	; Parameters:
[242]	48	; AH: Number of sectors to transfer (1...128)
	49	; ES:SI: Normalized ptr to buffer to receive data
[150]	50	; DS:DI: Ptr to DPT (in RAMVARS segment)
	51	; SS:BP: Ptr to PIOVARS
	52	; Returns:
[242]	53	; DS:DI: Ptr to DPT (in RAMVARS segment)
[150]	54	; AH: BIOS Error code
[218]	55	; CX: Number of successfully transferred sectors
[294]	56	; CF: 0 if transfer successful
[150]	57	; 1 if any error
	58	; Corrupts registers:
[218]	59	; AL, BX, DX, SI, ES
[150]	60	;--------------------------------------------------------------------
[242]	61	ReadFromDrive:
	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
[218]	68	jc SHORT ReturnWithTransferErrorInAH
[242]	69	xchg si, di ; ES:DI now points buffer
[218]	70
[242]	71	mov cx, [bp+PIOVARS.wWordsInBlock]
	72
[150]	73	ALIGN JUMP_ALIGN
[242]	74	.ReadNextBlockFromDrive:
[150]	75	mov dx, [bp+PIOVARS.wDataPort]
[218]	76	cmp [bp+PIOVARS.wWordsLeft], cx
[242]	77	jbe SHORT .ReadLastBlockFromDrive
[218]	78	call [bp+PIOVARS.fnXfer]
[169]	79
[218]	80	; Wait until ready for next block and check for errors
[242]	81	xchg di, si ; DS:DI now points DPT
[218]	82	call IdeWait_IRQorDRQ ; Wait until ready to transfer
	83	jc SHORT ReturnWithTransferErrorInAH
[242]	84	xchg si, di ; ES:DI now points buffer
[169]	85
[242]	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
[150]	91
	92	ALIGN JUMP_ALIGN
[242]	93	.ReadLastBlockFromDrive:
[218]	94	mov cx, [bp+PIOVARS.wWordsLeft]
[150]	95	call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
	96
[242]	97	; Check for errors in last block
	98	mov di, si ; DS:DI now points DPT
	99	CheckErrorsAfterTransferringLastBlock:
	100	mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
	101	call IdeWait_PollStatusFlagInBLwithTimeoutInBH
[150]	102
[242]	103	; Return number of successfully read sectors
	104	ReturnWithTransferErrorInAH:
	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
[150]	113	;--------------------------------------------------------------------
[242]	114	; WriteToDrive
[150]	115	; Parameters:
[242]	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
[150]	119	; SS:BP: Ptr to PIOVARS
	120	; Returns:
	121	; AH: BIOS Error code
[218]	122	; CX: Number of successfully transferred sectors
[294]	123	; CF: 0 if transfer successful
[150]	124	; 1 if any error
	125	; Corrupts registers:
[218]	126	; AL, BX, DX, SI, ES
[150]	127	;--------------------------------------------------------------------
	128	ALIGN JUMP_ALIGN
[242]	129	WriteToDrive:
	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
[218]	137	jc SHORT ReturnWithTransferErrorInAH
[150]	138
[242]	139	mov cx, [bp+PIOVARS.wWordsInBlock]
	140
[218]	141	ALIGN JUMP_ALIGN
[242]	142	.WriteNextBlockToDrive:
[150]	143	mov dx, [bp+PIOVARS.wDataPort]
[218]	144	cmp [bp+PIOVARS.wWordsLeft], cx
[242]	145	jbe SHORT .WriteLastBlockToDrive
[218]	146	call [bp+PIOVARS.fnXfer]
[169]	147
[218]	148	; Wait until ready for next block and check for errors
	149	call IdeWait_IRQorDRQ ; Wait until ready to transfer
	150	jc SHORT ReturnWithTransferErrorInAH
[150]	151
[242]	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
[169]	157
[150]	158	ALIGN JUMP_ALIGN
[242]	159	.WriteLastBlockToDrive:
[218]	160	mov cx, [bp+PIOVARS.wWordsLeft]
[242]	161	%ifdef USE_186
	162	push CheckErrorsAfterTransferringLastBlock
	163	jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
	164	%else
[150]	165	call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
[242]	166	jmp SHORT CheckErrorsAfterTransferringLastBlock
	167	%endif
[218]	168
[150]	169
	170	;--------------------------------------------------------------------
[218]	171	; InitializePiovarsInSSBPwithSectorCountInAH
[150]	172	; Parameters:
[218]	173	; AH: Number of sectors to transfer (1...128)
[150]	174	; BX: Offset to transfer function lookup table
	175	; DS:DI: Ptr to DPT (in RAMVARS segment)
[169]	176	; SS:BP: Ptr to PIOVARS
[167]	177	; Returns:
[169]	178	; Nothing
[150]	179	; Corrupts registers:
[242]	180	; AX, BX, DX
[150]	181	;--------------------------------------------------------------------
	182	ALIGN JUMP_ALIGN
[218]	183	InitializePiovarsInSSBPwithSectorCountInAH:
	184	; Store sizes
	185	xor al, al
	186	mov [bp+PIOVARS.wWordsLeft], ax
[242]	187	mov ah, [di+DPT_ATA.bSetBlock]
	188	mov [bp+PIOVARS.wWordsInBlock], ax
[218]	189	cbw
	190	mov [bp+PIOVARS.wWordsDone], ax ; Zero
[150]	191
	192	; Get transfer function based on bus type
[158]	193	xchg ax, bx ; Lookup table offset to AX
[242]	194	mov bl, [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS
[150]	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
[242]	198	mov [bp+PIOVARS.wDataPort], dx
[150]	199	mov ax, [cs:bx] ; Load offset to transfer function
	200	mov [bp+PIOVARS.fnXfer], ax
	201	ret
	202
	203
	204	;--------------------------------------------------------------------
[152]	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
[150]	210	; Parameters:
	211	; CX: Block size in WORDs
	212	; DX: IDE Data port address
[242]	213	; ES:DI: Normalized ptr to buffer to receive data
[150]	214	; Returns:
	215	; Nothing
	216	; Corrupts registers:
	217	; AX, BX, CX
	218	;--------------------------------------------------------------------
	219	ALIGN JUMP_ALIGN
[152]	220	DualByteReadForXtide:
[181]	221	eSHR_IM cx, 2 ; Loop unrolling
[152]	222	mov bx, 8 ; Bit mask for toggling data low/high reg
[150]	223	ALIGN JUMP_ALIGN
	224	.InswLoop:
[152]	225	XTIDE_INSW
	226	XTIDE_INSW
	227	XTIDE_INSW
	228	XTIDE_INSW
[150]	229	loop .InswLoop
	230	ret
	231
[152]	232	;----
[150]	233	ALIGN JUMP_ALIGN
	234	SingleByteRead:
	235	%ifdef USE_186 ; INS instruction available
[152]	236	shl cx, 1 ; WORD count to BYTE count
[251]	237	dec cx ; Fix for CX overflowing on a 128 sector transfer
	238	insb
[150]	239	rep insb
	240	%else ; If 8088/8086
[152]	241	shr cx, 1 ; WORD count to DWORD count
[150]	242	ALIGN JUMP_ALIGN
	243	.InsdLoop:
	244	in al, dx
[152]	245	stosb ; Store to [ES:DI]
[150]	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
[152]	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
[150]	274
[152]	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
[150]	292	;--------------------------------------------------------------------
[152]	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
[150]	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
[152]	308	DualByteWriteForXtide:
[150]	309	push ds
	310	push bx
[181]	311	eSHR_IM cx, 2 ; Loop unrolling
[152]	312	mov bx, 8 ; Bit mask for toggling data low/high reg
	313	push es ; Copy ES...
	314	pop ds ; ...to DS
[150]	315	ALIGN JUMP_ALIGN
	316	.OutswLoop:
[152]	317	XTIDE_OUTSW
	318	XTIDE_OUTSW
	319	XTIDE_OUTSW
	320	XTIDE_OUTSW
[150]	321	loop .OutswLoop
	322	pop bx
	323	pop ds
	324	ret
	325
[152]	326	;----
[150]	327	ALIGN JUMP_ALIGN
	328	SingleByteWrite:
	329	%ifdef USE_186 ; OUTS instruction available
[152]	330	shl cx, 1 ; WORD count to BYTE count
[251]	331	dec cx ; Fix for CX overflowing on a 128 sector transfer
	332	es outsb ; Source is ES segment
	333	rep es outsb
[150]	334	%else ; If 8088/8086
[152]	335	shr cx, 1 ; WORD count to DWORD count
	336	push ds ; Store DS
	337	push es ; Copy ES...
	338	pop ds ; ...to DS
[150]	339	ALIGN JUMP_ALIGN
	340	.OutsdLoop:
[152]	341	lodsb ; Load from [DS:SI] to AL
[150]	342	out dx, al
	343	lodsb
	344	out dx, al
	345	lodsb
	346	out dx, al
	347	lodsb
	348	out dx, al
	349	loop .OutsdLoop
[152]	350	pop ds ; Restore DS
[150]	351	%endif
	352	ret
	353
[152]	354	;---
	355	ALIGN JUMP_ALIGN
	356	WordWriteForXTIDEmod:
	357	push ds
[181]	358	eSHR_IM cx, 2 ; Loop unrolling
[152]	359	push es ; Copy ES...
	360	pop ds ; ...to DS
	361	ALIGN JUMP_ALIGN
	362	.WriteNextQword:
	363	XTIDE_MOD_OUTSW
	364	XTIDE_MOD_OUTSW
	365	XTIDE_MOD_OUTSW
	366	XTIDE_MOD_OUTSW
	367	loop .WriteNextQword
	368	pop ds
	369	ret
[150]	370
[152]	371	;----
	372	ALIGN JUMP_ALIGN
	373	WordWrite:
[223]	374	es ; Source is ES segment
[152]	375	rep
[155]	376	db 6Fh ; OUTSW (we want this in XT build)
[152]	377	ret
	378
	379	ALIGN JUMP_ALIGN
	380	DWordWrite:
	381	shr cx, 1 ; WORD count to DWORD count
[223]	382	es ; Source is ES segment
[152]	383	rep
	384	db 66h ; Override operand size to 32-bit
	385	db 6Fh ; OUTSW/OUTSD
	386	ret
	387
	388
[150]	389	; Lookup tables to get transfer function based on bus type
	390	ALIGN WORD_ALIGN
	391	g_rgfnPioRead:
[152]	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
[150]	402	g_rgfnPioWrite:
[152]	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

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