source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/IdeAutodetect.asm@ 562

Last change on this file since 562 was 526, checked in by krille_n_@…, 12 years ago

Changes:

  • Update of the copyright notices to include the year 2013.
File size: 10.6 KB
Line 
1; Project name : XTIDE Universal BIOS Configurator v2
2; Description : Functions to detect ports and devices.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 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
23IDE_PORT_TO_START_DETECTION EQU 00h ; Must be zero (not actual port)
24FIRST_MEMORY_SEGMENT_ADDRESS EQU 0C000h
25
26;--------------------------------------------------------------------
27; IdeAutodetect_DetectIdeDeviceFromPortDXAndReturnControlBlockInSI
28; Parameters:
29; DX: IDE Base Port or segment address (Command Block)
30; DS:DI: Ptr to ROMVARS
31; Returns:
32; AL: Device Type
33; SI: IDE Control Block Base port (port mapped devices only)
34; CF: Clear if IDE Device found
35; Set if IDE Device not found
36; Corrupts registers:
37; AH, BX
38;--------------------------------------------------------------------
39IdeAutodetect_DetectIdeDeviceFromPortDXAndReturnControlBlockInSI:
40 cmp dx, FIRST_MEMORY_SEGMENT_ADDRESS
41 jb SHORT DetectPortMappedDeviceFromPortDX
42 ; Fall to DetectMemoryMappedDeviceFromSegmentDX
43
44;--------------------------------------------------------------------
45; DetectMemoryMappedDeviceFromSegmentDX
46; Parameters:
47; DX: Segment address for Memory Mapped Device
48; DS:DI: Ptr to ROMVARS
49; Returns:
50; AL: Device Type
51; CF: Clear if IDE Device found
52; Set if IDE Device not found
53; Corrupts registers:
54; AH, BX
55;--------------------------------------------------------------------
56DetectMemoryMappedDeviceFromSegmentDX:
57 ; *** Try to detect JR-IDE/ISA (only if MODULE_8BIT_IDE_ADVANCED is present) ***
58 test WORD [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE_ADVANCED
59 jz SHORT NoIdeDeviceFound
60
61 push ds
62 mov ds, dx
63 cli ; Disable Interrupts
64 mov ah, [JRIDE_COMMAND_BLOCK_REGISTER_WINDOW_OFFSET + STATUS_REGISTER_in]
65 mov al, [JRIDE_CONTROL_BLOCK_REGISTER_WINDOW_OFFSET + ALTERNATE_STATUS_REGISTER_in]
66 sti ; Enable Interrupts
67 pop ds
68 call CompareIdeStatusRegistersFromALandAH
69 mov al, DEVICE_8BIT_JRIDE_ISA ; Assume CF was cleared
70 mov si, dx ; For IDEDTCT.COM
71 ret ; No need to return Control Block Port
72
73
74;--------------------------------------------------------------------
75; DetectPortMappedDeviceFromPortDX
76; Parameters:
77; DX: IDE Base Port (Command Block)
78; DS:DI: Ptr to ROMVARS
79; Returns:
80; AL: Device Type
81; SI: IDE Control Block Base port
82; CF: Clear if IDE Device found
83; Set if IDE Device not found
84; Corrupts registers:
85; AH, BX
86;--------------------------------------------------------------------
87DetectPortMappedDeviceFromPortDX:
88 ; *** Try to detect Standard 16- and 32-bit IDE Devices ***
89 mov al, DEVICE_16BIT_ATA ; Assume 16-bit ISA slot for AT builds
90 call Buffers_IsXTbuildLoaded
91 eCMOVE al, DEVICE_8BIT_ATA ; Assume 8-bit ISA slot for XT builds
92
93 ; Start with standard Control Block base port used by Primary and Secondary IDE
94 mov si, dx
95 add si, STANDARD_CONTROL_BLOCK_OFFSET
96 mov bx, STATUS_REGISTER_in | (ALTERNATE_STATUS_REGISTER_in << 8)
97.RedetectTertiaryOrQuaternaryWithDifferentControlBlockAddress:
98 push ax ; Store device type
99 call DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH
100 pop ax ; Restore device type
101 jnc SHORT .IdeDeviceFound
102
103 ; 16- or 32-bit IDE Device was not found but we may have used wrong Control Block port if we were trying
104 ; to detect Tertiary or Quaternary IDE controllers. Control Block port location is not standardized. For
105 ; example Promise FloppyMAX has Control Block at STANDARD_CONTROL_BLOCK_OFFSET but Sound Blaster 16 (CT2290)
106 ; use DEVICE_ATA_SECONDARY_PORTCTRL for Tertiary and Quaternary even though only Secondary should use that.
107 call ChangeDifferentControlBlockAddressToSI
108 je SHORT .RedetectTertiaryOrQuaternaryWithDifferentControlBlockAddress
109
110
111 ; Detect 8-bit devices only if MODULE_8BIT_IDE is available
112 test BYTE [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE
113 jz SHORT NoIdeDeviceFound
114
115 ; *** Try to detect XT-CF ***
116 mov si, dx
117 add si, BYTE XTCF_CONTROL_BLOCK_OFFSET
118 shl bx, 1 ; SHL 1 register offsets for XT-CF
119 call DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH
120 mov al, DEVICE_8BIT_XTCF_PIO8
121 jnc SHORT .IdeDeviceFound
122
123
124 ; *** Try to detect 8-bit XT-IDE rev 1 or rev 2 ***
125 ; Note that A0<->A3 address swaps Status Register and Alternative
126 ; Status Register addresses. That is why we need another step
127 ; to check is this XT-IDE rev 1 or rev 2.
128 sub si, BYTE XTCF_CONTROL_BLOCK_OFFSET >> 1
129 shr bx, 1
130 call DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH
131 jc SHORT NoIdeDeviceFound ; No XT-IDE rev 1 or rev 2 found
132
133 ; Now we can be sure that we have XT-IDE rev 1 or rev 2.
134 ; Rev 2 swaps address lines A0 and A3 thus LBA Low Register
135 ; moves from offset 3h to offset Ah. There is no Register at
136 ; offset Ah so if we can write to it and read back, then we
137 ; must have XT-IDE rev 2 or modded rev 1.
138 push dx
139 add dx, BYTE 0Ah ; LBA Low Register for XT-IDE rev 2
140 mov al, DEVICE_8BIT_XTIDE_REV2 ; Our test byte
141 out dx, al ; Output our test byte
142 JMP_DELAY
143 in al, dx ; Read back
144 pop dx
145 cmp al, DEVICE_8BIT_XTIDE_REV2
146 je SHORT .IdeDeviceFound
147 mov al, DEVICE_8BIT_XTIDE_REV1 ; We must have rev 1
148.IdeDeviceFound:
149 clc
150 ret
151
152
153;--------------------------------------------------------------------
154; DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH
155; Parameters:
156; BL: Offset to IDE Status Register
157; BH: Offset to Alternative Status Register
158; DX: IDE Base Port address
159; SI: IDE Control Block address
160; Returns:
161; CF: Clear if IDE Device found
162; Set if IDE Device not found
163; Corrupts registers:
164; AX
165;--------------------------------------------------------------------
166DetectIdeDeviceFromPortsDXandSIwithOffsetsInBLandBH:
167 ; Read Status and Alternative Status Registers
168 push dx
169
170 add dl, bl
171 cli ; Disable Interrupts
172 in al, dx ; Read Status Register...
173 mov ah, al ; ...to AH
174 mov dx, si
175 add dl, bh
176 in al, dx ; Read Alternative Status Register to AL
177 sti ; Enable Interrupts
178
179 pop dx
180 ; Fall to CompareIdeStatusRegistersFromALandAH
181
182
183;--------------------------------------------------------------------
184; CompareIdeStatusRegistersFromALandAH
185; Parameters:
186; AH: Possible IDE Status Register contents
187; AL: Possible IDE Alternative Status Register contents
188; Returns:
189; CF: Clear if valid Status Register Contents
190; Set if not possible IDE Status Registers
191; Corrupts registers:
192; Nothing
193;--------------------------------------------------------------------
194CompareIdeStatusRegistersFromALandAH:
195 ; Status Register now in AH and Alternative Status Register in AL.
196 ; They must be the same if base port was in use by IDE device.
197 cmp al, ah
198 jne SHORT NoIdeDeviceFound
199
200 ; Bytes were the same but it is possible they were both FFh, for
201 ; example. We must make sure bits are what is expected from valid
202 ; IDE Status Register. So far all drives I've tested return 50h
203 ; (FLG_STATUS_DRDY and FLG_STATUS_DSC set) or 00h.
204 ; I suspect that the zero might mean non available drive is selected. For example if Master
205 ; drive is present but Slave is selected from IDE Drive and Head Select Register,
206 ; then the Status Register can be 00h. We cannot accept 00h as valid byte
207 ; since that can easily cause invalid JR-IDE/ISA detections.
208 test al, FLG_STATUS_BSY | FLG_STATUS_DF | FLG_STATUS_DRQ | FLG_STATUS_ERR
209 jnz SHORT NoIdeDeviceFound ; Busy or Errors cannot be set
210 test al, FLG_STATUS_DRDY
211 jz SHORT NoIdeDeviceFound ; Device needs to be ready
212 ret ; Return with CF cleared
213
214NoIdeDeviceFound:
215 stc
216 ret
217
218
219;--------------------------------------------------------------------
220; ChangeDifferentControlBlockAddressToSI
221; Parameters:
222; DX: IDE Base Port address
223; SI: IDE Control Block address
224; Returns:
225; ZF: Set if SI changed
226; Cleared if different control block address is not possible
227; Corrupts registers:
228; AH
229;--------------------------------------------------------------------
230ChangeDifferentControlBlockAddressToSI:
231 cmp si, 368h
232 je SHORT .TrySecondAlternative
233 cmp si, 3E8h
234 je SHORT .TrySecondAlternative
235
236 cmp si, 360h
237 je SHORT .TryLastAlternative
238 cmp si, 3E0h
239 je SHORT .TryLastAlternative
240 ret ; Return with ZF cleared
241
242.TryLastAlternative:
243 mov si, DEVICE_ATA_SECONDARY_PORTCTRL + 8 ; Changes to 370h used by Sound Blaster 16 (CT2290)
244 ; Fall to .TrySecondAlternative
245.TrySecondAlternative:
246 sub si, BYTE 8h ; 368h to 360h, 3E8h to 3E0h
247 xor ah, ah ; Set ZF
248 ret
249
250
251;--------------------------------------------------------------------
252; IdeAutodetect_IncrementDXtoNextIdeBasePort
253; Parameters:
254; DX: Previous IDE Base Port or IDE_PORT_TO_START_DETECTION
255; Returns:
256; DX: Next IDE Base Port
257; ZF: Set if no more Base Ports (DX was last base port on entry)
258; Clear if new base port returned in DX
259; Corrupts registers:
260; AX
261;--------------------------------------------------------------------
262ALIGN JUMP_ALIGN
263IdeAutodetect_IncrementDXtoNextIdeBasePort:
264 cmp dx, [cs:.wLastIdePort]
265 je SHORT .AllPortsAlreadyDetected
266
267 push si
268 mov si, .rgwIdeBasePorts
269.CompareNextIdeBasePort:
270 cmp [cs:si], dx
271 lea si, [si+2] ; Increment SI and preserve FLAGS
272 jne SHORT .CompareNextIdeBasePort
273
274 mov dx, [cs:si] ; Get next port
275 test dx, dx ; Clear ZF
276 pop si
277.AllPortsAlreadyDetected:
278 ret
279
280
281 ; All ports used in autodetection. Ports can be in any order.
282ALIGN WORD_ALIGN
283.rgwIdeBasePorts:
284 dw IDE_PORT_TO_START_DETECTION ; Must be first
285 ; Standard IDE
286 dw DEVICE_ATA_PRIMARY_PORT
287 dw DEVICE_ATA_SECONDARY_PORT
288 dw DEVICE_ATA_TERTIARY_PORT
289 dw DEVICE_ATA_QUATERNARY_PORT
290 ; 8-bit Devices
291 dw 200h
292 dw 220h
293 dw 240h
294 dw 260h
295 dw 280h
296 dw 2A0h
297 dw 2C0h
298 dw 2E0h
299 dw 300h
300 dw 320h
301 dw 340h
302 dw 360h
303 dw 380h
304 dw 3A0h
305 dw 3C0h
306 dw 3E0h
307 ; JR-IDE/ISA (Memory Segment Addresses)
308 dw 0C000h
309 dw 0C400h
310 dw 0C800h
311 dw 0CC00h
312 dw 0D000h
313 dw 0D400h
314 dw 0D800h
315.wLastIdePort:
316 dw 0DC00h
Note: See TracBrowser for help on using the repository browser.