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IdeTransfer.asm@ 447

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Last change on this file since 447 was 445, checked in by krille_n_@…, 12 years ago

Changes:

A speed optimization to the eSHL_IM macro for 386 and higher. This change breaks emulation in the sense that the macro will fail when given a memory operand as the first parameter.
Memory_SumCXbytesFromESSItoAL now returns with the zero flag set/cleared according to the result.
Unrolled all the 8 bit READ transfer loops to do 16 bytes per iteration. Added a new macro (UNROLL_SECTORS_IN_CX_TO_OWORDS) as part of it. Size wise this is expensive but I think it should be worth the ROM space. The WRITE transfer loops were left as is since writes are rare anyway (<10% of all disk I/O IIRC).
Minor optimizations and fixes here and there.

File size: 13.0 KB

Rev	Line
[150]	1	; Project name : XTIDE Universal BIOS
	2	; Description : IDE Device transfer functions.
	3
[376]	4	;
[445]	5	; XTIDE Universal BIOS and Associated Tools
[376]	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
	7	;
	8	; This program is free software; you can redistribute it and/or modify
	9	; it under the terms of the GNU General Public License as published by
	10	; the Free Software Foundation; either version 2 of the License, or
	11	; (at your option) any later version.
[445]	12	;
[376]	13	; This program is distributed in the hope that it will be useful,
	14	; but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
[445]	16	; GNU General Public License for more details.
[376]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[445]	18	;
[376]	19
[150]	20	; Structure containing variables for PIO transfer functions.
	21	; This struct must not be larger than IDEPACK without INTPACK.
[414]	22	struc PIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc.
	23	.wDataPort resb 2 ; 0-1, IDE Data Port
	24	.fnXfer resb 2 ; 2-3, Offset to transfer function
	25	.wSectorsInBlock resb 2 ; 4-5, Block size in sectors
[363]	26	.bSectorsLeft resb 1 ; 6, Sectors left to transfer
[218]	27	resb 1 ; 7, IDEPACK.bDeviceControl
[363]	28	.bSectorsDone resb 1 ; 8, Number of sectors xferred
[150]	29	endstruc
	30
	31
	32	; Section containing code
	33	SECTION .text
	34
	35	;--------------------------------------------------------------------
	36	; IdeTransfer_StartWithCommandInAL
	37	; Parameters:
	38	; AL: IDE command that was used to start the transfer
[171]	39	; (all PIO read and write commands including Identify Device)
[218]	40	; ES:SI: Ptr to normalized data buffer
[150]	41	; DS:DI: Ptr to DPT (in RAMVARS segment)
	42	; SS:BP: Ptr to IDEPACK
	43	; Returns:
	44	; AH: INT 13h Error Code
[218]	45	; CX: Number of successfully transferred sectors
[150]	46	; CF: Cleared if success, Set if error
	47	; Corrupts registers:
[218]	48	; AL, BX, DX, SI, ES
[150]	49	;--------------------------------------------------------------------
	50	ALIGN JUMP_ALIGN
	51	IdeTransfer_StartWithCommandInAL:
[157]	52	; Are we reading or writing?
[171]	53	test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
[242]	54	mov ah, [bp+IDEPACK.bSectorCount]
	55	jnz SHORT WriteToDrive
[171]	56	cmp al, COMMAND_WRITE_MULTIPLE
[242]	57	je SHORT WriteToDrive
	58	; Fall to ReadFromDrive
[150]	59
	60	;--------------------------------------------------------------------
[242]	61	; ReadFromDrive
[150]	62	; Parameters:
[242]	63	; AH: Number of sectors to transfer (1...128)
	64	; ES:SI: Normalized ptr to buffer to receive data
[150]	65	; DS:DI: Ptr to DPT (in RAMVARS segment)
	66	; SS:BP: Ptr to PIOVARS
	67	; Returns:
[242]	68	; DS:DI: Ptr to DPT (in RAMVARS segment)
[150]	69	; AH: BIOS Error code
[218]	70	; CX: Number of successfully transferred sectors
[294]	71	; CF: 0 if transfer successful
[150]	72	; 1 if any error
	73	; Corrupts registers:
[218]	74	; AL, BX, DX, SI, ES
[150]	75	;--------------------------------------------------------------------
[242]	76	ReadFromDrive:
	77	; Prepare to read data to ESSI
	78	mov bx, g_rgfnPioRead
	79	call InitializePiovarsInSSBPwithSectorCountInAH
	80
	81	; Wait until drive is ready to transfer
	82	call IdeWait_IRQorDRQ ; Wait until ready to transfer
[218]	83	jc SHORT ReturnWithTransferErrorInAH
[242]	84	xchg si, di ; ES:DI now points buffer
[218]	85
[363]	86	mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128
[242]	87
[150]	88	ALIGN JUMP_ALIGN
[242]	89	.ReadNextBlockFromDrive:
[150]	90	mov dx, [bp+PIOVARS.wDataPort]
[363]	91	cmp [bp+PIOVARS.bSectorsLeft], cl
[242]	92	jbe SHORT .ReadLastBlockFromDrive
[218]	93	call [bp+PIOVARS.fnXfer]
[169]	94
[218]	95	; Wait until ready for next block and check for errors
[242]	96	xchg di, si ; DS:DI now points DPT
[218]	97	call IdeWait_IRQorDRQ ; Wait until ready to transfer
	98	jc SHORT ReturnWithTransferErrorInAH
[242]	99	xchg si, di ; ES:DI now points buffer
[169]	100
[363]	101	; Increment number of successfully read sectors
	102	mov cx, [bp+PIOVARS.wSectorsInBlock]
	103	sub [bp+PIOVARS.bSectorsLeft], cl
	104	add [bp+PIOVARS.bSectorsDone], cl
[242]	105	jmp SHORT .ReadNextBlockFromDrive
[150]	106
	107	ALIGN JUMP_ALIGN
[242]	108	.ReadLastBlockFromDrive:
[363]	109	mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero
[419]	110	push cx
[150]	111	call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
	112
[242]	113	; Check for errors in last block
	114	mov di, si ; DS:DI now points DPT
	115	CheckErrorsAfterTransferringLastBlock:
[417]	116	mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY)
[242]	117	call IdeWait_PollStatusFlagInBLwithTimeoutInBH
[419]	118	pop cx ; [bp+PIOVARS.bSectorsLeft]
	119	jc SHORT ReturnWithTransferErrorInAH
[150]	120
[445]	121	; All sectors successfully transferred
[419]	122	add cx, [bp+PIOVARS.bSectorsDone] ; Never sets CF
	123	ret
	124
[242]	125	; Return number of successfully read sectors
	126	ReturnWithTransferErrorInAH:
[370]	127	%ifdef USE_386
	128	movzx cx, [bp+PIOVARS.bSectorsDone]
	129	%else
[363]	130	mov cl, [bp+PIOVARS.bSectorsDone]
	131	mov ch, 0 ; Preserve CF
[370]	132	%endif
[242]	133	ret
	134
	135
[150]	136	;--------------------------------------------------------------------
[242]	137	; WriteToDrive
[150]	138	; Parameters:
[242]	139	; AH: Number of sectors to transfer (1...128)
	140	; DS:DI: Ptr to DPT (in RAMVARS segment)
	141	; ES:SI: Normalized ptr to buffer containing data
[150]	142	; SS:BP: Ptr to PIOVARS
	143	; Returns:
	144	; AH: BIOS Error code
[218]	145	; CX: Number of successfully transferred sectors
[294]	146	; CF: 0 if transfer successful
[150]	147	; 1 if any error
	148	; Corrupts registers:
[218]	149	; AL, BX, DX, SI, ES
[150]	150	;--------------------------------------------------------------------
	151	ALIGN JUMP_ALIGN
[242]	152	WriteToDrive:
	153	; Prepare to write data from ESSI
	154	mov bx, g_rgfnPioWrite
	155	call InitializePiovarsInSSBPwithSectorCountInAH
	156
	157	; Always poll when writing first block (IRQs are generated for following blocks)
	158	mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
	159	call IdeWait_PollStatusFlagInBLwithTimeoutInBH
[218]	160	jc SHORT ReturnWithTransferErrorInAH
[150]	161
[363]	162	mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128
[242]	163
[218]	164	ALIGN JUMP_ALIGN
[242]	165	.WriteNextBlockToDrive:
[150]	166	mov dx, [bp+PIOVARS.wDataPort]
[363]	167	cmp [bp+PIOVARS.bSectorsLeft], cl
[242]	168	jbe SHORT .WriteLastBlockToDrive
[218]	169	call [bp+PIOVARS.fnXfer]
[169]	170
[218]	171	; Wait until ready for next block and check for errors
	172	call IdeWait_IRQorDRQ ; Wait until ready to transfer
	173	jc SHORT ReturnWithTransferErrorInAH
[150]	174
[363]	175	; Increment number of successfully written sectors
	176	mov cx, [bp+PIOVARS.wSectorsInBlock]
	177	sub [bp+PIOVARS.bSectorsLeft], cl
	178	add [bp+PIOVARS.bSectorsDone], cl
[242]	179	jmp SHORT .WriteNextBlockToDrive
[169]	180
[150]	181	ALIGN JUMP_ALIGN
[242]	182	.WriteLastBlockToDrive:
[363]	183	mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero
[419]	184	push cx
[242]	185	%ifdef USE_186
	186	push CheckErrorsAfterTransferringLastBlock
	187	jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
	188	%else
[150]	189	call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
[242]	190	jmp SHORT CheckErrorsAfterTransferringLastBlock
	191	%endif
[218]	192
[150]	193
	194	;--------------------------------------------------------------------
[218]	195	; InitializePiovarsInSSBPwithSectorCountInAH
[150]	196	; Parameters:
[218]	197	; AH: Number of sectors to transfer (1...128)
[150]	198	; BX: Offset to transfer function lookup table
	199	; DS:DI: Ptr to DPT (in RAMVARS segment)
[169]	200	; SS:BP: Ptr to PIOVARS
[167]	201	; Returns:
[169]	202	; Nothing
[150]	203	; Corrupts registers:
[242]	204	; AX, BX, DX
[150]	205	;--------------------------------------------------------------------
	206	ALIGN JUMP_ALIGN
[218]	207	InitializePiovarsInSSBPwithSectorCountInAH:
	208	; Store sizes
[363]	209	mov [bp+PIOVARS.bSectorsLeft], ah
[370]	210	eMOVZX ax, [di+DPT_ATA.bBlockSize]
[363]	211	mov [bp+PIOVARS.wSectorsInBlock], ax
	212	mov [bp+PIOVARS.bSectorsDone], ah ; Zero
[150]	213
	214	; Get transfer function based on bus type
[158]	215	xchg ax, bx ; Lookup table offset to AX
[242]	216	mov bl, [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS
[150]	217	mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address
[400]	218	mov bl, [di+DPT_ATA.bDevice]
[150]	219	add bx, ax
[363]	220
[242]	221	mov [bp+PIOVARS.wDataPort], dx
[150]	222	mov ax, [cs:bx] ; Load offset to transfer function
	223	mov [bp+PIOVARS.fnXfer], ax
	224	ret
	225
	226
	227	;--------------------------------------------------------------------
[361]	228	; ReadBlockFromXtideRev1 XTIDE rev 1
	229	; ReadBlockFromXtideRev2 XTIDE rev 2 or rev 1 with swapped A0 and A3 (chuck-mod)
[444]	230	; ReadBlockFrom8bitDataPort CF-XT when using 8-bit PIO
[361]	231	; ReadBlockFrom16bitDataPort Normal 16-bit IDE
	232	; ReadBlockFrom32bitDataPort VLB/PCI 32-bit IDE
[150]	233	; Parameters:
[363]	234	; CX: Block size in 512 byte sectors
[150]	235	; DX: IDE Data port address
[242]	236	; ES:DI: Normalized ptr to buffer to receive data
[150]	237	; Returns:
	238	; Nothing
	239	; Corrupts registers:
	240	; AX, BX, CX
	241	;--------------------------------------------------------------------
[400]	242	%ifdef MODULE_8BIT_IDE
	243
[444]	244	ALIGN JUMP_ALIGN
	245	ReadBlockFromXtideRev1:
[445]	246	UNROLL_SECTORS_IN_CX_TO_OWORDS
[444]	247	mov bl, 8 ; Bit mask for toggling data low/high reg
	248	ALIGN JUMP_ALIGN
	249	.InswLoop:
[445]	250	%rep 8 ; WORDs
[444]	251	XTIDE_INSW
[445]	252	%endrep
[444]	253	loop .InswLoop
	254	ret
[150]	255
[444]	256	;--------------------------------------------------------------------
	257	%ifndef USE_186 ; 8086/8088 compatible WORD read
	258	ALIGN JUMP_ALIGN
	259	ReadBlockFromXtideRev2:
[445]	260	UNROLL_SECTORS_IN_CX_TO_OWORDS
[444]	261	ALIGN JUMP_ALIGN
[445]	262	.ReadNextOword:
	263	%rep 8 ; WORDs
	264	in ax, dx ; Read WORD
	265	stosw ; Store WORD to [ES:DI]
	266	%endrep
	267	loop .ReadNextOword
[444]	268	ret
	269	%endif
[150]	270
[444]	271	;--------------------------------------------------------------------
	272	%ifdef USE_186
	273	ALIGN JUMP_ALIGN
	274	ReadBlockFrom8bitDataPort:
	275	shl cx, 9 ; Sectors to BYTEs
	276	rep insb
	277	ret
[442]	278
[444]	279	%else ; If 8088/8086
[445]	280	ALIGN JUMP_ALIGN
[444]	281	ReadBlockFrom8bitDataPort:
[445]	282	UNROLL_SECTORS_IN_CX_TO_OWORDS
[444]	283	ALIGN JUMP_ALIGN
[445]	284	.ReadNextOword:
	285	%rep 16 ; BYTEs
	286	in al, dx ; Read BYTE
	287	stosb ; Store BYTE to [ES:DI]
	288	%endrep
	289	loop .ReadNextOword
[444]	290	ret
	291	%endif
[400]	292	%endif ; MODULE_8BIT_IDE
	293
[361]	294	;--------------------------------------------------------------------
[401]	295	%ifdef USE_186
[444]	296	ALIGN JUMP_ALIGN
	297	ReadBlockFrom16bitDataPort:
	298	xchg cl, ch ; Sectors to WORDs
	299	rep insw
	300	ret
[401]	301	%endif
[152]	302
[361]	303	;--------------------------------------------------------------------
[401]	304	%ifdef USE_AT
[444]	305	ALIGN JUMP_ALIGN
	306	ReadBlockFrom32bitDataPort:
	307	shl cx, 7 ; Sectors to DWORDs
	308	rep
	309	db 66h ; Override operand size to 32-bit
	310	db 6Dh ; INSW/INSD
	311	ret
[401]	312	%endif
[152]	313
	314
[150]	315	;--------------------------------------------------------------------
[361]	316	; WriteBlockToXtideRev1 XTIDE rev 1
	317	; WriteBlockToXtideRev2 XTIDE rev 2 or rev 1 with swapped A0 and A3 (chuck-mod)
[444]	318	; WriteBlockTo8bitDataPort XT-CF when using 8-bit PIO
[361]	319	; WriteBlockTo16bitDataPort Normal 16-bit IDE
	320	; WriteBlockTo32bitDataPort VLB/PCI 32-bit IDE
[150]	321	; Parameters:
[363]	322	; CX: Block size in 512-byte sectors
[150]	323	; DX: IDE Data port address
	324	; ES:SI: Normalized ptr to buffer containing data
	325	; Returns:
	326	; Nothing
	327	; Corrupts registers:
[417]	328	; AX, BX, CX, DX
[150]	329	;--------------------------------------------------------------------
[400]	330	%ifdef MODULE_8BIT_IDE
	331
[444]	332	ALIGN JUMP_ALIGN
	333	WriteBlockToXtideRev1:
	334	push ds
	335	UNROLL_SECTORS_IN_CX_TO_QWORDS
	336	mov bl, 8 ; Bit mask for toggling data low/high reg
	337	push es ; Copy ES...
	338	pop ds ; ...to DS
	339	ALIGN JUMP_ALIGN
	340	.OutswLoop:
[445]	341	%rep 4 ; WORDs
[444]	342	XTIDE_OUTSW
[445]	343	%endrep
[444]	344	loop .OutswLoop
	345	pop ds
	346	ret
[150]	347
[444]	348	;--------------------------------------------------------------------
	349	ALIGN JUMP_ALIGN
	350	WriteBlockToXtideRev2:
	351	UNROLL_SECTORS_IN_CX_TO_QWORDS
	352	push ds
	353	push es ; Copy ES...
	354	pop ds ; ...to DS
	355	ALIGN JUMP_ALIGN
	356	.WriteNextQword:
[445]	357	%rep 4 ; WORDs
[444]	358	XTIDE_MOD_OUTSW
[445]	359	%endrep
[444]	360	loop .WriteNextQword
	361	pop ds
	362	ret
[150]	363
[444]	364	;--------------------------------------------------------------------
	365	%ifdef USE_186
	366	ALIGN JUMP_ALIGN
	367	WriteBlockTo8bitDataPort:
	368	shl cx, 9 ; Sectors to BYTEs
	369	es ; Source is ES segment
	370	rep outsb
	371	ret
[442]	372
[444]	373	%else ; If 8088/8086
	374	ALIGN JUMP_ALIGN
	375	WriteBlockTo8bitDataPort:
	376	UNROLL_SECTORS_IN_CX_TO_DWORDS
	377	push ds
	378	push es
	379	pop ds
	380	ALIGN JUMP_ALIGN
	381	.WriteNextDword:
[445]	382	%rep 4 ; BYTEs
	383	lodsb ; Load BYTE from [DS:SI]
	384	out dx, al ; Write BYTE
	385	%endrep
[444]	386	loop .WriteNextDword
	387	pop ds
	388	ret
	389	%endif
[400]	390	%endif ; MODULE_8BIT_IDE
	391
[361]	392	;--------------------------------------------------------------------
[402]	393	%ifdef USE_AT
[361]	394	ALIGN JUMP_ALIGN
	395	WriteBlockTo16bitDataPort:
[363]	396	xchg cl, ch ; Sectors to WORDs
[223]	397	es ; Source is ES segment
[444]	398	rep outsw
[152]	399	ret
	400
[361]	401	;--------------------------------------------------------------------
[152]	402	ALIGN JUMP_ALIGN
[361]	403	WriteBlockTo32bitDataPort:
[444]	404	shl cx, 7 ; Sectors to DWORDs
[223]	405	es ; Source is ES segment
[152]	406	rep
	407	db 66h ; Override operand size to 32-bit
	408	db 6Fh ; OUTSW/OUTSD
	409	ret
[421]	410	%endif ; USE_AT
[152]	411
	412
[361]	413
[150]	414	; Lookup tables to get transfer function based on bus type
	415	ALIGN WORD_ALIGN
	416	g_rgfnPioRead:
[400]	417	%ifdef MODULE_8BIT_IDE
[401]	418	dw 0 ; 0, DEVICE_8BIT_JRIDE_ISA
[444]	419	dw ReadBlockFrom8bitDataPort ; 1, DEVICE_8BIT_XTCF
[400]	420	%ifdef USE_186
[401]	421	dw ReadBlockFrom16bitDataPort ; 2, DEVICE_8BIT_XTIDE_REV2
[400]	422	%else
[401]	423	dw ReadBlockFromXtideRev2 ; 2, DEVICE_8BIT_XTIDE_REV2
[400]	424	%endif
[401]	425	dw ReadBlockFromXtideRev1 ; 3, DEVICE_XTIDE_REV1
[400]	426
[152]	427	%else
[400]	428	times COUNT_OF_8BIT_IDE_DEVICES dw 0
[152]	429	%endif
[401]	430	%ifdef USE_AT
	431	dw ReadBlockFrom16bitDataPort ; 4, DEVICE_16BIT_ATA
	432	dw ReadBlockFrom32bitDataPort ; 5, DEVICE_32BIT_ATA
	433	%endif
[152]	434
[400]	435
[150]	436	g_rgfnPioWrite:
[400]	437	%ifdef MODULE_8BIT_IDE
[401]	438	dw 0 ; 0, DEVICE_8BIT_JRIDE_ISA
[444]	439	dw WriteBlockTo8bitDataPort ; 1, DEVICE_8BIT_XTCF
[401]	440	dw WriteBlockToXtideRev2 ; 2, DEVICE_XTIDE_REV2
	441	dw WriteBlockToXtideRev1 ; 3, DEVICE_XTIDE_REV1
[400]	442
[361]	443	%else
[400]	444	times COUNT_OF_8BIT_IDE_DEVICES dw 0
[361]	445	%endif
[401]	446	%ifdef USE_AT
	447	dw WriteBlockTo16bitDataPort ; 4, DEVICE_16BIT_ATA
	448	dw WriteBlockTo32bitDataPort ; 5, DEVICE_32BIT_ATA
	449	%endif

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