source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm@ 492

Last change on this file since 492 was 480, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • XT-CF DMA transfers should now work.
File size: 8.6 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : IDE Device Command functions.
3
4;
5; XTIDE Universal BIOS and Associated Tools
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.
12;
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
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
24; IdeCommand_ResetMasterAndSlaveController
25; Parameters:
26; DS:DI: Ptr to DPT (in RAMVARS segment)
27; Returns:
28; AH: INT 13h Error Code
29; CF: Cleared if success, Set if error
30; Corrupts registers:
31; AL, BX, CX, DX
32;--------------------------------------------------------------------
33IdeCommand_ResetMasterAndSlaveController:
34 ; HSR0: Set_SRST
35 call AccessDPT_GetDeviceControlByteToAL
36 or al, FLG_DEVCONTROL_SRST | FLG_DEVCONTROL_nIEN ; Set Reset bit
37 OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER DEVICE_CONTROL_REGISTER_out
38 mov ax, HSR0_RESET_WAIT_US
39 call Timer_DelayMicrosecondsFromAX
40
41 ; HSR1: Clear_wait
42 call AccessDPT_GetDeviceControlByteToAL
43 or al, FLG_DEVCONTROL_nIEN
44 and al, ~FLG_DEVCONTROL_SRST ; Clear reset bit
45 OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER DEVICE_CONTROL_REGISTER_out
46 mov ax, HSR1_RESET_WAIT_US
47 call Timer_DelayMicrosecondsFromAX
48
49 ; HSR2: Check_status
50 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_MAXIMUM, FLG_STATUS_BSY)
51 jmp IdeWait_PollStatusFlagInBLwithTimeoutInBH
52
53
54;--------------------------------------------------------------------
55; IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
56; Parameters:
57; BH: Drive Select byte for Drive and Head Select Register
58; DX: Autodetected port for XT-CF
59; DS: Segment to RAMVARS
60; ES:SI: Ptr to buffer to receive 512-byte IDE Information
61; CS:BP: Ptr to IDEVARS
62; Returns:
63; AH: INT 13h Error Code
64; CF: Cleared if success, Set if error
65; Corrupts registers:
66; AL, BX, CX, DX, SI, DI, ES
67;--------------------------------------------------------------------
68IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH:
69 ; Create fake DPT to be able to use Device.asm functions
70 call FindDPT_ForNewDriveToDSDI
71 eMOVZX ax, bh
72 mov [di+DPT.wFlags], ax
73 call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
74 call IdeDPT_StoreDeviceTypeToDPTinDSDIfromIdevarsInCSBP
75 mov BYTE [di+DPT_ATA.bBlockSize], 1 ; Block = 1 sector
76
77 ; Wait until drive motors have reached full speed
78 cmp bp, BYTE ROMVARS.ideVars0 ; First controller?
79 jne SHORT .SkipLongWaitSinceDriveIsNotPrimaryMaster
80 test bh, FLG_DRVNHEAD_DRV ; Wait already done for Master
81 jnz SHORT .SkipLongWaitSinceDriveIsNotPrimaryMaster
82 call AHDh_WaitUntilDriveMotorHasReachedFullSpeed
83.SkipLongWaitSinceDriveIsNotPrimaryMaster:
84
85 ; Create IDEPACK without INTPACK
86 push bp
87 call Idepack_FakeToSSBP
88
89%ifdef MODULE_8BIT_IDE
90 ; Enable 8-bit PIO mode for 8-bit ATA and XT-CF
91 push si
92 call AH9h_Enable8bitModeForDevice8bitAta
93 xor al, al ; XTCF_8BIT_PIO_MODE
94 call AH9h_SetModeFromALtoXTCF
95 pop si
96%endif ; MODULE_8BIT_IDE
97
98 ; Prepare to output Identify Device command
99 mov dl, 1 ; Sector count (required by IdeTransfer.asm)
100 mov al, COMMAND_IDENTIFY_DEVICE
101 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
102 call Idepack_StoreNonExtParametersAndIssueCommandFromAL
103
104 ; Clean stack and return
105.FailedToSet8bitMode:
106 lea sp, [bp+SIZE_OF_IDEPACK_WITHOUT_INTPACK] ; This assumes BP hasn't changed between Idepack_FakeToSSBP and here
107 pop bp
108 ret
109
110
111;--------------------------------------------------------------------
112; IdeCommand_OutputWithParameters
113; Parameters:
114; BH: System timer ticks for timeout
115; BL: IDE Status Register bit to poll after command
116; ES:SI: Ptr to buffer (for data transfer commands)
117; DS:DI: Ptr to DPT (in RAMVARS segment)
118; SS:BP: Ptr to IDEPACK
119; Returns:
120; AH: INT 13h Error Code
121; CX: Number of successfully transferred sectors (for transfer commands)
122; CF: Cleared if success, Set if error
123; Corrupts registers:
124; AL, BX, (CX), DX, (ES:SI for data transfer commands)
125;--------------------------------------------------------------------
126ALIGN JUMP_ALIGN
127IdeCommand_OutputWithParameters:
128 push bx ; Store status register bits to poll
129
130 ; Select Master or Slave drive and output head number or LBA28 top bits
131 call IdeCommand_SelectDrive
132 jc SHORT .DriveNotReady
133
134 ; Output Device Control Byte to enable or disable interrupts
135 mov al, [bp+IDEPACK.bDeviceControl]
136%ifdef MODULE_IRQ
137 test al, FLG_DEVCONTROL_nIEN ; Interrupts disabled?
138 jnz SHORT .DoNotSetInterruptInServiceFlag
139
140 ; Clear Task Flag and set Interrupt In-Service Flag
141 or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_INTERRUPT_IN_SERVICE
142 push ds
143 LOAD_BDA_SEGMENT_TO ds, dx, ! ; Also zero DX
144 mov [BDA.bHDTaskFlg], dl
145 pop ds
146.DoNotSetInterruptInServiceFlag:
147%endif
148 OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER DEVICE_CONTROL_REGISTER_out
149
150 ; Output Feature Number
151 mov al, [bp+IDEPACK.bFeatures]
152 OUTPUT_AL_TO_IDE_REGISTER FEATURES_REGISTER_out
153
154 ; Output Sector Address High (only used by LBA48)
155%ifdef MODULE_EBIOS
156 eMOVZX ax, [bp+IDEPACK.bLbaLowExt] ; Zero sector count
157 mov cx, [bp+IDEPACK.wLbaMiddleAndHighExt]
158 call OutputSectorCountAndAddress
159%endif
160
161 ; Output Sector Address Low
162 mov ax, [bp+IDEPACK.wSectorCountAndLbaLow]
163 mov cx, [bp+IDEPACK.wLbaMiddleAndHigh]
164 call OutputSectorCountAndAddress
165
166 ; Output command
167 mov al, [bp+IDEPACK.bCommand]
168 OUTPUT_AL_TO_IDE_REGISTER COMMAND_REGISTER_out
169
170 ; Wait until command completed
171 pop bx ; Pop status and timeout for polling
172 cmp bl, FLG_STATUS_DRQ ; Data transfer started?
173 jne SHORT .WaitUntilNonTransferCommandCompletes
174%ifdef MODULE_8BIT_IDE
175 cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_MEMMAP
176 jae SHORT JrIdeTransfer_StartWithCommandInAL ; DEVICE_8BIT_XTCF_MEMMAP or DEVICE_8BIT_JRIDE_ISA
177%endif
178 jmp IdeTransfer_StartWithCommandInAL
179
180.WaitUntilNonTransferCommandCompletes:
181%ifdef MODULE_IRQ
182 test BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
183 jz SHORT .PollStatusFlagInsteadOfWaitIrq
184 jmp IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
185.PollStatusFlagInsteadOfWaitIrq:
186%endif
187 jmp IdeWait_PollStatusFlagInBLwithTimeoutInBH
188
189.DriveNotReady:
190 pop bx ; Clean stack
191 ret
192
193
194;--------------------------------------------------------------------
195; IdeCommand_SelectDrive
196; Parameters:
197; DS:DI: Ptr to DPT (in RAMVARS segment)
198; SS:BP: Ptr to IDEPACK
199; Returns:
200; AH: INT 13h Error Code
201; CF: Cleared if success, Set if error
202; Corrupts registers:
203; AL, BX, CX, DX
204;--------------------------------------------------------------------
205ALIGN JUMP_ALIGN
206IdeCommand_SelectDrive:
207 ; We use different timeout value when detecting drives.
208 ; This prevents unnecessary long delays when drive is not present.
209 mov cx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
210 cmp WORD [RAMVARS.wDrvDetectSignature], RAMVARS_DRV_DETECT_SIGNATURE
211 eCMOVE ch, TIMEOUT_SELECT_DRIVE_DURING_DRIVE_DETECTION
212
213 ; Select Master or Slave Drive
214 mov al, [bp+IDEPACK.bDrvAndHead]
215 OUTPUT_AL_TO_IDE_REGISTER DRIVE_AND_HEAD_SELECT_REGISTER
216 mov bx, cx
217 call IdeWait_PollStatusFlagInBLwithTimeoutInBH
218
219 ; Ignore errors from IDE Error Register (set by previous command)
220 cmp ah, RET_HD_TIMEOUT
221 je SHORT .FailedToSelectDrive
222 xor ax, ax ; Always success unless timeout
223 ret
224.FailedToSelectDrive:
225 stc
226 ret
227
228
229;--------------------------------------------------------------------
230; OutputSectorCountAndAddress
231; Parameters:
232; AH: LBA low bits (Sector Number)
233; AL: Sector Count
234; CL: LBA middle bits (Cylinder Number low)
235; CH: LBA high bits (Cylinder Number high)
236; DS:DI: Ptr to DPT (in RAMVARS segment)
237; Returns:
238; Nothing
239; Corrupts registers:
240; AL, BX, DX
241;--------------------------------------------------------------------
242ALIGN JUMP_ALIGN
243OutputSectorCountAndAddress:
244 OUTPUT_AL_TO_IDE_REGISTER SECTOR_COUNT_REGISTER
245
246 mov al, ah
247 OUTPUT_AL_TO_IDE_REGISTER LBA_LOW_REGISTER
248
249 mov al, cl
250 OUTPUT_AL_TO_IDE_REGISTER LBA_MIDDLE_REGISTER
251
252 mov al, ch
253 OUTPUT_AL_TO_IDE_REGISTER LBA_HIGH_REGISTER
254 ret
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