source: xtideuniversalbios/tags/v2.0.0_beta_2/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm@ 536

Last change on this file since 536 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: 8.4 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; DS: Segment to RAMVARS
59; ES:SI: Ptr to buffer to receive 512-byte IDE Information
60; CS:BP: Ptr to IDEVARS
61; Returns:
62; AH: INT 13h Error Code
63; CF: Cleared if success, Set if error
64; Corrupts registers:
65; AL, BX, CX, DX, SI, DI, ES
66;--------------------------------------------------------------------
67IdeCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH:
68 ; Create fake DPT to be able to use Device.asm functions
69 call FindDPT_ForNewDriveToDSDI
70 eMOVZX ax, bh
71 mov [di+DPT.wFlags], ax
72 mov [di+DPT.bIdevarsOffset], bp
73 mov BYTE [di+DPT_ATA.bBlockSize], 1 ; Block = 1 sector
74 call IdeDPT_StoreDeviceTypeFromIdevarsInCSBPtoDPTinDSDI
75
76 ; Wait until drive motors have reached full speed
77 cmp bp, BYTE ROMVARS.ideVars0 ; First controller?
78 jne SHORT .SkipLongWaitSinceDriveIsNotPrimaryMaster
79 test bh, FLG_DRVNHEAD_DRV ; Wait already done for Master
80 jnz SHORT .SkipLongWaitSinceDriveIsNotPrimaryMaster
81 call AHDh_WaitUntilDriveMotorHasReachedFullSpeed
82.SkipLongWaitSinceDriveIsNotPrimaryMaster:
83
84 ; Create IDEPACK without INTPACK
85 push bp
86 call Idepack_FakeToSSBP
87
88%ifdef MODULE_8BIT_IDE
89 ; Enable 8-bit PIO mode for Lo-tech XT-CF
90 push si
91 call AH9h_Enable8bitPioModeForXTCF
92 pop si
93 jc SHORT .FailedToSet8bitMode
94%endif
95
96 ; Prepare to output Identify Device command
97 mov dl, 1 ; Sector count (required by IdeTransfer.asm)
98 mov al, COMMAND_IDENTIFY_DEVICE
99 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
100 call Idepack_StoreNonExtParametersAndIssueCommandFromAL
101
102 ; Clean stack and return
103.FailedToSet8bitMode:
104 lea sp, [bp+SIZE_OF_IDEPACK_WITHOUT_INTPACK] ; This assumes BP hasn't changed between Idepack_FakeToSSBP and here
105 pop bp
106 ret
107
108
109;--------------------------------------------------------------------
110; IdeCommand_OutputWithParameters
111; Parameters:
112; BH: System timer ticks for timeout
113; BL: IDE Status Register bit to poll after command
114; ES:SI: Ptr to buffer (for data transfer commands)
115; DS:DI: Ptr to DPT (in RAMVARS segment)
116; SS:BP: Ptr to IDEPACK
117; Returns:
118; AH: INT 13h Error Code
119; CX: Number of successfully transferred sectors (for transfer commands)
120; CF: Cleared if success, Set if error
121; Corrupts registers:
122; AL, BX, (CX), DX, (ES:SI for data transfer commands)
123;--------------------------------------------------------------------
124ALIGN JUMP_ALIGN
125IdeCommand_OutputWithParameters:
126 push bx ; Store status register bits to poll
127
128 ; Select Master or Slave drive and output head number or LBA28 top bits
129 call IdeCommand_SelectDrive
130 jc SHORT .DriveNotReady
131
132 ; Output Device Control Byte to enable or disable interrupts
133 mov al, [bp+IDEPACK.bDeviceControl]
134%ifdef MODULE_IRQ
135 test al, FLG_DEVCONTROL_nIEN ; Interrupts disabled?
136 jnz SHORT .DoNotSetInterruptInServiceFlag
137
138 ; Clear Task Flag and set Interrupt In-Service Flag
139 or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_INTERRUPT_IN_SERVICE
140 push ds
141 LOAD_BDA_SEGMENT_TO ds, dx, ! ; Also zero DX
142 mov [BDA.bHDTaskFlg], dl
143 pop ds
144.DoNotSetInterruptInServiceFlag:
145%endif
146 OUTPUT_AL_TO_IDE_CONTROL_BLOCK_REGISTER DEVICE_CONTROL_REGISTER_out
147
148 ; Output Feature Number
149 mov al, [bp+IDEPACK.bFeatures]
150 OUTPUT_AL_TO_IDE_REGISTER FEATURES_REGISTER_out
151
152 ; Output Sector Address High (only used by LBA48)
153%ifdef MODULE_EBIOS
154 eMOVZX ax, [bp+IDEPACK.bLbaLowExt] ; Zero sector count
155 mov cx, [bp+IDEPACK.wLbaMiddleAndHighExt]
156 call OutputSectorCountAndAddress
157%endif
158
159 ; Output Sector Address Low
160 mov ax, [bp+IDEPACK.wSectorCountAndLbaLow]
161 mov cx, [bp+IDEPACK.wLbaMiddleAndHigh]
162 call OutputSectorCountAndAddress
163
164 ; Output command
165 mov al, [bp+IDEPACK.bCommand]
166 OUTPUT_AL_TO_IDE_REGISTER COMMAND_REGISTER_out
167
168 ; Wait until command completed
169 pop bx ; Pop status and timeout for polling
170 cmp bl, FLG_STATUS_DRQ ; Data transfer started?
171 jne SHORT .WaitUntilNonTransferCommandCompletes
172%ifdef MODULE_JRIDE
173 cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA
174 je SHORT JrIdeTransfer_StartWithCommandInAL
175%endif
176 jmp IdeTransfer_StartWithCommandInAL
177
178.WaitUntilNonTransferCommandCompletes:
179%ifdef MODULE_IRQ
180 test BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
181 jz SHORT .PollStatusFlagInsteadOfWaitIrq
182 jmp IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
183.PollStatusFlagInsteadOfWaitIrq:
184%endif
185 jmp IdeWait_PollStatusFlagInBLwithTimeoutInBH
186
187.DriveNotReady:
188 pop bx ; Clean stack
189 ret
190
191
192;--------------------------------------------------------------------
193; IdeCommand_SelectDrive
194; Parameters:
195; DS:DI: Ptr to DPT (in RAMVARS segment)
196; SS:BP: Ptr to IDEPACK
197; Returns:
198; AH: INT 13h Error Code
199; CF: Cleared if success, Set if error
200; Corrupts registers:
201; AL, BX, CX, DX
202;--------------------------------------------------------------------
203ALIGN JUMP_ALIGN
204IdeCommand_SelectDrive:
205 ; We use different timeout value when detecting drives.
206 ; This prevents unnecessary long delays when drive is not present.
207 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
208 cmp WORD [RAMVARS.wDrvDetectSignature], RAMVARS_DRV_DETECT_SIGNATURE
209 eCMOVE bh, TIMEOUT_SELECT_DRIVE_DURING_DRIVE_DETECTION
210
211 ; Select Master or Slave Drive
212 mov al, [bp+IDEPACK.bDrvAndHead]
213 OUTPUT_AL_TO_IDE_REGISTER DRIVE_AND_HEAD_SELECT_REGISTER
214 call IdeWait_PollStatusFlagInBLwithTimeoutInBH
215
216 ; Ignore errors from IDE Error Register (set by previous command)
217 cmp ah, RET_HD_TIMEOUT
218 je SHORT .FailedToSelectDrive
219 xor ax, ax ; Always success unless timeout
220 ret
221.FailedToSelectDrive:
222 stc
223 ret
224
225
226;--------------------------------------------------------------------
227; OutputSectorCountAndAddress
228; Parameters:
229; AH: LBA low bits (Sector Number)
230; AL: Sector Count
231; CL: LBA middle bits (Cylinder Number low)
232; CH: LBA high bits (Cylinder Number high)
233; DS:DI: Ptr to DPT (in RAMVARS segment)
234; Returns:
235; Nothing
236; Corrupts registers:
237; AL, BX, DX
238;--------------------------------------------------------------------
239ALIGN JUMP_ALIGN
240OutputSectorCountAndAddress:
241 OUTPUT_AL_TO_IDE_REGISTER SECTOR_COUNT_REGISTER
242
243 mov al, ah
244 OUTPUT_AL_TO_IDE_REGISTER LBA_LOW_REGISTER
245
246 mov al, cl
247 OUTPUT_AL_TO_IDE_REGISTER LBA_MIDDLE_REGISTER
248
249 mov al, ch
250 JUMP_TO_OUTPUT_AL_TO_IDE_REGISTER LBA_HIGH_REGISTER
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