source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH1Eh_XTCF.asm@ 477

Last change on this file since 477 was 477, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Added non-working DMA transfer code.
File size: 5.2 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=1Eh, Lo-tech XT-CF features.
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; Int 13h function AH=1Eh, Lo-tech XT-CF features.
25; This function is supported only by XTIDE Universal BIOS.
26;
27; AH1Eh_HandlerForXTCFfeatures
28; Parameters:
29; AL, CX: Same as in INTPACK
30; DL: Translated Drive number
31; DS:DI: Ptr to DPT (in RAMVARS segment)
32; SS:BP: Ptr to IDEPACK
33; Parameters on INTPACK:
34; AL: XT-CF subcommand (see XTCF.inc for more info)
35; Returns with INTPACK:
36; AH: Int 13h return status
37; CF: 0 if successful, 1 if error
38;--------------------------------------------------------------------
39AH1Eh_HandlerForXTCFfeatures:
40%ifndef USE_186
41 call ProcessXTCFsubcommandFromAL
42 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
43%else
44 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
45 ; Fall to ProcessXTCFsubcommandFromAL
46%endif
47
48
49;--------------------------------------------------------------------
50; ProcessXTCFsubcommandFromAL
51; Parameters:
52; AL: XT-CF subcommand (see XTCF.inc for more info)
53; DS:DI: Ptr to DPT (in RAMVARS segment)
54; SS:BP: Ptr to IDEPACK
55; Returns:
56; AH: Int 13h return status
57; CF: 0 if successful, 1 if error
58; Corrupts registers:
59; AL, BX, CX, DX, SI
60;--------------------------------------------------------------------
61ProcessXTCFsubcommandFromAL:
62 ; IS_THIS_DRIVE_XTCF. We check this for all commands.
63 call AccessDPT_IsThisDeviceXTCF
64 jne SHORT XTCFnotFound
65 and ax, BYTE 7Fh ; Subcommand now in AX
66 jz SHORT .ReturnWithSuccess ; IS_THIS_DRIVE_XTCF
67
68 ; READ_XTCF_CONTROL_REGISTER_TO_DH
69 dec ax ; Subcommand
70 jnz SHORT .SkipReadXtcfControlRegisterToDH
71 mov dx, [di+DPT.wBasePort]
72 add dl, XTCF_CONTROL_REGISTER
73 in al, dx
74 mov [bp+IDEPACK.intpack+INTPACK.dh], al
75.ReturnWithSuccess:
76 xor ah, ah
77 ret
78.SkipReadXtcfControlRegisterToDH:
79
80 ; WRITE_DH_TO_XTCF_CONTROL_REGISTER
81 dec ax ; Subcommand
82 jnz SHORT XTCFnotFound ; Invalid subcommand
83 mov al, [bp+IDEPACK.intpack+INTPACK.dh]
84 ; Fall to AH1Eh_ChangeXTCFmodeBasedOnControlRegisterInAL
85
86
87;--------------------------------------------------------------------
88; AH1Eh_ChangeXTCFmodeBasedOnControlRegisterInAL
89; Parameters:
90; AL: XT-CF Control Register
91; DS:DI: Ptr to DPT (in RAMVARS segment)
92; SS:BP: Ptr to IDEPACK
93; Returns:
94; AH: Int 13h return status
95; CF: 0 if successful, 1 if error
96; Corrupts registers:
97; AL, BX, CX, DX, SI
98;--------------------------------------------------------------------
99AH1Eh_ChangeXTCFmodeBasedOnControlRegisterInAL:
100 ; Output Control Register
101 mov dx, [di+DPT.wBasePort]
102 add dl, XTCF_CONTROL_REGISTER
103 out dx, al
104
105 ; Convert Control Register Contents to device code
106 test al, al
107 jz SHORT .Set8bitPioMode
108 cmp al, XTCF_MEMORY_MAPPED_MODE
109 jae SHORT .SetMemoryMappedMode
110
111 ; Set DMA Mode
112 mov BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_DMA
113 mov al, [di+DPT_ATA.bBlockSize]
114 call AH24h_SetBlockSize ; AH=24h limits block size if necessary
115 jmp SHORT .Enable8bitPioMode
116
117.SetMemoryMappedMode:
118 mov BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_MEMMAP
119 jmp SHORT .Enable8bitPioMode
120
121.Set8bitPioMode:
122 mov BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_PIO8
123 ; Fall to .Enable8bitPioMode
124
125 ; We always need to enable 8-bit mode since 16-bit mode is restored
126 ; when controller is reset (AH=0h or Dh)
127.Enable8bitPioMode:
128 jmp AH23h_Enable8bitPioMode
129
130
131;--------------------------------------------------------------------
132; AH1Eh_DetectXTCFwithBasePortInDX
133; Parameters:
134; DX: Base I/O port address to check
135; Returns:
136; AH: RET_HD_SUCCESS if XT-CF is found from port
137; RET_HD_INVALID if XT-CF is not found
138; CF: Cleared if XT-CF found
139; Set if XT-CF not found
140; Corrupts registers:
141; AL
142;--------------------------------------------------------------------
143AH1Eh_DetectXTCFwithBasePortInDX:
144 push dx
145 add dl, XTCT_CONTROL_REGISTER_INVERTED_in ; set DX to XT-CF config register (inverted)
146 in al, dx ; get value
147 mov ah, al ; save in ah
148 inc dx ; set DX to XT-CF config register (non-inverted)
149 in al, dx ; get value
150 not al ; invert value
151 pop dx
152 sub ah, al ; do they match? (clear AH if they do)
153 jz SHORT XTCFfound
154
155XTCFnotFound:
156AH1Eh_LoadInvalidCommandToAHandSetCF:
157 stc ; set carry flag since XT-CF not found
158 mov ah, RET_HD_INVALID
159XTCFfound:
160 ret ; and return
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