source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/Idepack.asm@ 435

Last change on this file since 435 was 421, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Addressing modes are now NORMAL, LARGE and LBA.
  • L-CHS parameters are now generated differently for drives with 8192 or less cylinders.
File size: 5.8 KB
RevLine 
[150]1; Project name : XTIDE Universal BIOS
2; Description : Functions for managing IDEPACK struct.
3
[376]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
[150]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
[158]34 sub sp, BYTE EXTRA_BYTES_FOR_INTPACK
[150]35 mov bp, sp
36 jmp ax
37
[181]38
[150]39;--------------------------------------------------------------------
[165]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
[249]50; CX: Number of successfully transferred sectors (for transfer commands)
[165]51; CF: Cleared if success, Set if error
52; Corrupts registers:
[249]53; AL, BX, (CX), DX, SI, ES
[165]54;--------------------------------------------------------------------
[181]55%ifdef MODULE_EBIOS
[165]56ALIGN JUMP_ALIGN
57Idepack_ConvertDapToIdepackAndIssueCommandFromAH:
[224]58 mov al, [es:si+DAP.wSectorCount]
[221]59 mov [bp+IDEPACK.bSectorCount], al
[165]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
[421]72 call AccessDPT_GetDriveSelectByteForEbiosToAL
[165]73 or al, ah
74 mov [bp+IDEPACK.bDrvAndHead], al
[221]75
76 ; Normalize data buffer pointer to ES:SI
[224]77 mov ax, [es:si+DAP.wOffset]
[221]78 mov cx, ax
79 eSHR_IM ax, 4 ; Divide offset by 16
[224]80 add ax, [es:si+DAP.wSegment] ; Add segment
[221]81 mov es, ax ; Segment normalized
82 mov si, cx
83 and si, BYTE 0Fh ; Offset normalized
[165]84 jmp SHORT GetDeviceControlByteToIdepackAndStartTransfer
[421]85%endif ; MODULE_EBIOS
[165]86
[181]87
[165]88;--------------------------------------------------------------------
[150]89; Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
90; Parameters:
91; AH: IDE command to issue
[221]92; AL: Number of sectors to transfer (for xfer commands)
[150]93; BH: Timeout ticks
94; BL: IDE Status Register flag to wait after command
95; CH: Cylinder number, bits 7...0
96; CL: Bits 7...6: Cylinder number bits 9 and 8
97; Bits 5...0: Starting sector number (1...63)
98; DH: Starting head number (0...255)
99; DS:DI: Ptr to DPT (in RAMVARS segment)
[221]100; ES:SI: Ptr to normalized data buffer (for xfer commands)
[218]101; SS:BP: Ptr to IDEPACK (containing INTPACK)
[150]102; Returns:
103; AH: INT 13h Error Code
[249]104; CX: Number of successfully transferred sectors (for transfer commands)
[150]105; CF: Cleared if success, Set if error
106; Corrupts registers:
[249]107; AL, BX, (CX), DX
[150]108;--------------------------------------------------------------------
109ALIGN JUMP_ALIGN
110Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH:
[218]111 mov [bp+IDEPACK.bSectorCount], al
[169]112 mov [bp+IDEPACK.bCommand], ah
[181]113
[150]114 push bx
[155]115 call Address_OldInt13hAddressToIdeAddress
[421]116 call AccessDPT_GetDriveSelectByteForOldInt13hToAL
[150]117 or al, bh ; AL now has Drive and Head Select Byte
118 mov [bp+IDEPACK.bDrvAndHead], al
119 mov [bp+IDEPACK.bLbaLow], bl
120 mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
121 pop bx
122
[165]123GetDeviceControlByteToIdepackAndStartTransfer:
[150]124 call AccessDPT_GetDeviceControlByteToAL
125 mov [bp+IDEPACK.bDeviceControl], al
[181]126 jmp Device_OutputCommandWithParameters
[150]127
128
129;--------------------------------------------------------------------
130; Idepack_StoreNonExtParametersAndIssueCommandFromAL
131; Parameters:
132; BH: Timeout ticks
133; BL: IDE Status Register flag to wait after command
134; AL: IDE command to issue
135; AH: Parameter to Drive and Head Select Register (Head bits only)
136; DL: Parameter to Sector Count Register
137; DH: Parameter to LBA Low / Sector Number Register
138; CL: Parameter to LBA Middle / Cylinder Low Register
139; CH: Parameter to LBA High / Cylinder High Register
140; SI: Parameter to Features Register
141; DS:DI: Ptr to DPT (in RAMVARS segment)
142; SS:BP: Ptr to IDEPACK
143; Returns:
144; AH: INT 13h Error Code
145; CF: Cleared if success, Set if error
146; Corrupts registers:
147; AL, BX, CX, DX
148;--------------------------------------------------------------------
149ALIGN JUMP_ALIGN
150Idepack_StoreNonExtParametersAndIssueCommandFromAL:
151 mov [bp+IDEPACK.bFeatures], si
152 mov [bp+IDEPACK.bCommand], al
153 mov [bp+IDEPACK.wSectorCountAndLbaLow], dx
154 mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
155
156 ; Drive and Head select byte
157 and ah, MASK_DRVNHEAD_HEAD ; Keep head bits only
[421]158 call AccessDPT_GetDriveSelectByteForOldInt13hToAL
[150]159 or al, ah
160 mov [bp+IDEPACK.bDrvAndHead], al
161
162 ; Device Control byte with interrupts disabled
163 call AccessDPT_GetDeviceControlByteToAL
164 or al, FLG_DEVCONTROL_nIEN ; Disable interrupt
165 mov [bp+IDEPACK.bDeviceControl], al
166
167 jmp Device_OutputCommandWithParameters
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