source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/IdeAutodetect.asm@ 501

Last change on this file since 501 was 498, checked in by aitotat@…, 12 years ago

Changes to Configurator v2:

  • Auto Configure now detects XT-IDE rev 1 and rev 2 correctly.
File size: 7.3 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, 2011-2012 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; IdeAutodetect_DetectIdeDeviceFromPortDX
25; Parameters:
26; DX: IDE Base Port
27; DS:DI: Ptr to ROMVARS
28; Returns:
29; AL: Device Type
30; CF: Clear if IDE Device found
31; Set if IDE Device not found
32; Corrupts registers:
33; AH, BX, CX
34;--------------------------------------------------------------------
35IdeAutodetect_DetectIdeDeviceFromPortDX:
36 cmp dx, FIRST_MEMORY_SEGMENT_ADDRESS
37 jb SHORT .DetectPortMappedDevices
38
39 ; Try to detect JR-IDE/ISA (only if MODULE_8BIT_IDE_ADVANCED is present)
40 test WORD [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE_ADVANCED
41 jz SHORT .SkipRestOfDetection
42
43 push ds
44 mov ds, dx
45 cli ; Disable Interrupts
46 mov ah, [JRIDE_COMMAND_BLOCK_REGISTER_WINDOW_OFFSET + STATUS_REGISTER_in]
47 mov al, [JRIDE_CONTROL_BLOCK_REGISTER_WINDOW_OFFSET + ALTERNATE_STATUS_REGISTER_in]
48 sti ; Enable Interrupts
49 pop ds
50 call CompareIdeStatusRegistersFromALandAH
51 mov al, DEVICE_8BIT_JRIDE_ISA
52 ret
53.DetectPortMappedDevices:
54
55
56 ; Try to detect Standard 16- and 32-bit IDE Devices
57 mov bh, DEVICE_16BIT_ATA ; Assume 16-bit ISA slot for AT builds
58 call Buffers_IsXTbuildLoaded
59 eCMOVE bh, DEVICE_8BIT_ATA ; Assume 8-bit ISA slot for XT builds
60 mov bl, STATUS_REGISTER_in
61 mov cx, STANDARD_CONTROL_BLOCK_OFFSET + ALTERNATE_STATUS_REGISTER_in
62 call DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX
63 mov al, bh
64 jnc SHORT .IdeDeviceFound
65
66
67 ; Detect 8-bit devices only if MODULE_8BIT_IDE is available
68 test BYTE [di+ROMVARS.wFlags], FLG_ROMVARS_MODULE_8BIT_IDE
69 jz SHORT .SkipRestOfDetection
70
71 ; Try to detect XT-CF
72 mov bl, STATUS_REGISTER_in << 1
73 mov cx, (XTIDE_CONTROL_BLOCK_OFFSET + ALTERNATE_STATUS_REGISTER_in) << 1
74 call DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX
75 mov al, DEVICE_8BIT_XTCF_PIO8
76 jnc SHORT .IdeDeviceFound
77
78 ; Try to detect 8-bit XT-IDE rev 1 or rev 2.
79 ; Note that A0<->A3 address swaps Status Register and Alternative
80 ; Status Register addresses. That is why we need another step
81 ; to check is this XT-IDE rev 1 or rev 2.
82 shr cx, 1
83 call DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX
84 jc SHORT .SkipRestOfDetection ; No XT-IDE rev 1 or rev 2 found
85
86 ; Now we can be sure that we have XT-IDE rev 1 or rev 2.
87 ; Rev 2 swaps address lines A0 and A3 thus LBA Low Register
88 ; moves from offset 3h to offset Ah. There is no Register at
89 ; offset Ah so if we can write to it and read back, then we
90 ; must have XT-IDE rev 2 or modded rev 1.
91 push dx
92 add dx, BYTE 0Ah ; LBA Low Register for XT-IDE rev 2
93 mov al, DEVICE_8BIT_XTIDE_REV2 ; Our test byte
94 out dx, al ; Output our test byte
95 JMP_DELAY
96 in al, dx ; Read back
97 pop dx
98 cmp al, DEVICE_8BIT_XTIDE_REV2
99 je SHORT .IdeDeviceFound
100 mov al, DEVICE_8BIT_XTIDE_REV1 ; We must have rev 1
101 clc
102.IdeDeviceFound:
103 ret
104.SkipRestOfDetection:
105 stc
106 ret
107
108
109;--------------------------------------------------------------------
110; DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX
111; Parameters:
112; BL: Offset to IDE Status Register
113; CX: Offset to Alternative Status Register
114; DX: IDE Base Port
115; Returns:
116; CF: Clear if IDE Device found
117; Set if IDE Device not found
118; Corrupts registers:
119; AX
120;--------------------------------------------------------------------
121DetectIdeDeviceFromPortDXwithStatusRegOffsetsInBLandCX:
122 ; Read Status and Alternative Status Registers
123 push cx
124 push dx
125
126 add cx, dx ; CX = Address to Alternative Status Register
127 add dl, bl ; DX = Address to Status Register
128 cli ; Disable Interrupts
129 in al, dx ; Read Status Register
130 mov ah, al
131 mov dx, cx
132 in al, dx ; Read Alternative Status Register
133 sti ; Enable Interrupts
134
135 pop dx
136 pop cx
137 ; Fall to CompareIdeStatusRegistersFromALandAH
138
139
140;--------------------------------------------------------------------
141; CompareIdeStatusRegistersFromALandAH
142; Parameters:
143; AL: Possible IDE Status Register contents
144; AH: Possible IDE Alternative Status Register contents
145; Returns:
146; CF: Clear if valid Status Register Contents
147; Set if not possible IDE Status Registers
148; Corrupts registers:
149; Nothing
150;--------------------------------------------------------------------
151CompareIdeStatusRegistersFromALandAH:
152 ; Status Register now in AH and Alternative Status Register in AL.
153 ; They must be the same if base port was in use by IDE device.
154 cmp al, ah
155 jne SHORT .InvalidStatusRegister
156
157 ; Bytes were the same but it is possible they were both FFh, for
158 ; example. We must make sure bit are what is expected from valid
159 ; IDE Status Register.
160 test al, FLG_STATUS_BSY | FLG_STATUS_DF | FLG_STATUS_DRQ | FLG_STATUS_ERR
161 jnz SHORT .InvalidStatusRegister ; Busy or Errors cannot be set
162 test al, FLG_STATUS_DRDY
163 jz SHORT .InvalidStatusRegister ; Device needs to be ready
164 ret ; Return with CF cleared
165
166.InvalidStatusRegister:
167AllPortsAlreadyDetected:
168 stc
169 ret
170
171
172;--------------------------------------------------------------------
173; IdeAutodetect_IncrementDXtoNextIdeBasePort
174; Parameters:
175; DX: Previous IDE Base Port
176; Returns:
177; DX: Next IDE Base Port
178; ZF: Set if no more Base Ports (DX was last base port on entry)
179; Clear if new base port returned in DX
180; Corrupts registers:
181; AX
182;--------------------------------------------------------------------
183ALIGN JUMP_ALIGN
184IdeAutodetect_IncrementDXtoNextIdeBasePort:
185 cmp dx, [cs:.wLastIdePort]
186 je SHORT .AllPortsAlreadyDetected
187
188 push si
189 mov si, .rgwIdeBasePorts
190.CompareNextIdeBasePort:
191 cmp [cs:si], dx
192 lea si, [si+2] ; Increment SI and preserve FLAGS
193 jne SHORT .CompareNextIdeBasePort
194
195 mov dx, [cs:si] ; Get next port
196 test dx, dx ; Clear ZF
197 pop si
198.AllPortsAlreadyDetected:
199 ret
200
201
202 ; All ports used in autodetection. Ports can be in any order.
203ALIGN WORD_ALIGN
204.rgwIdeBasePorts:
205 dw IDE_PORT_TO_START_DETECTION ; Must be first
206 ; Standard IDE
207 dw DEVICE_ATA_PRIMARY_PORT
208 dw DEVICE_ATA_SECONDARY_PORT
209 dw DEVICE_ATA_TERTIARY_PORT
210 dw DEVICE_ATA_QUATERNARY_PORT
211 ; 8-bit Devices
212 dw 200h
213 dw 220h
214 dw 240h
215 dw 260h
216 dw 280h
217 dw 2A0h
218 dw 2C0h
219 dw 2E0h
220 dw 300h
221 dw 320h
222 dw 340h
223 dw 360h
224 dw 380h
225 dw 3A0h
226 dw 3C0h
227 dw 3E0h
228 ; JR-IDE/ISA (Memory Segment Addresses)
229 dw 0C000h
230 dw 0C400h
231 dw 0C800h
232 dw 0CC00h
233 dw 0D000h
234 dw 0D400h
235 dw 0D800h
236.wLastIdePort:
237 dw 0DC00h
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