source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/Idepack.asm@ 568

Last change on this file since 568 was 542, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Fixed a bug that allowed EBIOS functions for user defined CHS.
  • Simplified user defined CHS and LBA setup a little.
File size: 5.5 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Functions for managing IDEPACK struct.
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
23;--------------------------------------------------------------------
24; Idepack_FakeToSSBP
25; Parameters:
26; Nothing
27; Returns:
28; SS:BP: Ptr to IDEPACK
29; Corrupts registers:
30; AX
31;--------------------------------------------------------------------
32Idepack_FakeToSSBP:
33 pop ax
34 sub sp, BYTE SIZE_OF_IDEPACK_WITHOUT_INTPACK
35 mov bp, sp
36 jmp ax
37
38
39;--------------------------------------------------------------------
40; Idepack_ConvertDapToIdepackAndIssueCommandFromAH
41; Parameters:
42; AH: IDE command to issue
43; BH: Timeout ticks
44; BL: IDE Status Register flag to wait after command
45; DS:DI: Ptr to DPT (in RAMVARS segment)
46; ES:SI: Ptr to DAP (EBIOS Disk Address Packet)
47; SS:BP: Ptr to IDEPACK
48; Returns:
49; AH: INT 13h Error Code
50; CX: Number of successfully transferred sectors (for transfer commands)
51; CF: Cleared if success, Set if error
52; Corrupts registers:
53; AL, BX, (CX), DX, SI, ES
54;--------------------------------------------------------------------
55%ifdef MODULE_EBIOS
56ALIGN JUMP_ALIGN
57Idepack_ConvertDapToIdepackAndIssueCommandFromAH:
58 mov al, [es:si+DAP.wSectorCount]
59 mov [bp+IDEPACK.bSectorCount], al
60 mov [bp+IDEPACK.bCommand], ah
61
62 mov al, [es:si+DAP.qwLBA] ; LBA byte 0
63 mov [bp+IDEPACK.bLbaLow], al
64 mov ax, [es:si+DAP.qwLBA+1] ; LBA bytes 1 and 2
65 mov [bp+IDEPACK.wLbaMiddleAndHigh], ax
66 mov ah, [es:si+DAP.qwLBA+3] ; LBA byte 3, LBA28 bits 24...27
67 mov [bp+IDEPACK.bLbaLowExt], ah
68 mov cx, [es:si+DAP.qwLBA+4] ; LBA bytes 4 and 5
69 mov [bp+IDEPACK.wLbaMiddleAndHighExt], cx
70
71 and ah, 0Fh ; Limit bits for LBA28
72 call AccessDPT_GetDriveSelectByteToAL
73 or al, ah
74 mov [bp+IDEPACK.bDrvAndHead], al
75
76 ; Load data buffer pointer to ES:SI
77 les si, [es:si+DAP.dwMemoryAddress]
78 jmp SHORT GetDeviceControlByteToIdepackAndStartTransfer
79%endif ; MODULE_EBIOS
80
81
82;--------------------------------------------------------------------
83; Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
84; Parameters:
85; AH: IDE command to issue
86; AL: Number of sectors to transfer (for xfer commands)
87; BH: Timeout ticks
88; BL: IDE Status Register flag to wait after command
89; CH: Cylinder number, bits 7...0
90; CL: Bits 7...6: Cylinder number bits 9 and 8
91; Bits 5...0: Starting sector number (1...63)
92; DH: Starting head number (0...255)
93; DS:DI: Ptr to DPT (in RAMVARS segment)
94; ES:SI: Ptr to normalized data buffer (for xfer commands)
95; SS:BP: Ptr to IDEPACK (containing INTPACK)
96; Returns:
97; AH: INT 13h Error Code
98; CX: Number of successfully transferred sectors (for transfer commands)
99; CF: Cleared if success, Set if error
100; Corrupts registers:
101; AL, BX, (CX), DX
102;--------------------------------------------------------------------
103ALIGN JUMP_ALIGN
104Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH:
105 mov [bp+IDEPACK.bSectorCount], al
106 mov [bp+IDEPACK.bCommand], ah
107
108 push bx
109 call Address_OldInt13hAddressToIdeAddress
110 call AccessDPT_GetDriveSelectByteToAL
111 or al, bh ; AL now has Drive and Head Select Byte
112 mov [bp+IDEPACK.bDrvAndHead], al
113 mov [bp+IDEPACK.bLbaLow], bl
114 mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
115 pop bx
116
117GetDeviceControlByteToIdepackAndStartTransfer:
118 call AccessDPT_GetDeviceControlByteToAL
119 mov [bp+IDEPACK.bDeviceControl], al
120 jmp Device_OutputCommandWithParameters
121
122
123;--------------------------------------------------------------------
124; Idepack_StoreNonExtParametersAndIssueCommandFromAL
125; Parameters:
126; BH: Timeout ticks
127; BL: IDE Status Register flag to wait after command
128; AL: IDE command to issue
129; AH: Parameter to Drive and Head Select Register (Head bits only)
130; DL: Parameter to Sector Count Register
131; DH: Parameter to LBA Low / Sector Number Register
132; CL: Parameter to LBA Middle / Cylinder Low Register
133; CH: Parameter to LBA High / Cylinder High Register
134; SI: Parameter to Features Register
135; DS:DI: Ptr to DPT (in RAMVARS segment)
136; SS:BP: Ptr to IDEPACK
137; Returns:
138; AH: INT 13h Error Code
139; CF: Cleared if success, Set if error
140; Corrupts registers:
141; AL, BX, CX, DX
142;--------------------------------------------------------------------
143ALIGN JUMP_ALIGN
144Idepack_StoreNonExtParametersAndIssueCommandFromAL:
145 mov [bp+IDEPACK.bFeatures], si
146 mov [bp+IDEPACK.bCommand], al
147 mov [bp+IDEPACK.wSectorCountAndLbaLow], dx
148 mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
149
150 ; Drive and Head select byte
151 and ah, MASK_DRVNHEAD_HEAD ; Keep head bits only
152 call AccessDPT_GetDriveSelectByteToAL
153 or al, ah
154 mov [bp+IDEPACK.bDrvAndHead], al
155
156 ; Device Control byte with interrupts disabled
157 mov BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
158
159 jmp Device_OutputCommandWithParameters
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