source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AccessDPT.asm@ 465

Last change on this file since 465 was 443, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Offset to ATA-ID buffer will no longer get corrupted when trying to enable 8-bit mode for XT-CF.
  • Optimized A0<->A3 swapping a bit.
File size: 5.4 KB
RevLine 
[99]1; Project name : XTIDE Universal BIOS
[3]2; Description : Functions for accessing DPT data.
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
[3]20; Section containing code
21SECTION .text
22
[364]23%ifdef MODULE_ADVANCED_ATA
[3]24;--------------------------------------------------------------------
[364]25; AccessDPT_GetIdeBasePortToBX
26; Parameters:
27; DS:DI: Ptr to Disk Parameter Table
28; Returns:
29; BX: IDE Base Port Address
30; Corrupts registers:
31; Nothing
32;--------------------------------------------------------------------
33ALIGN JUMP_ALIGN
34AccessDPT_GetIdeBasePortToBX:
35 eMOVZX bx, [di+DPT.bIdevarsOffset] ; CS:BX points to IDEVARS
36 mov bx, [cs:bx+IDEVARS.wPort]
37 ret
[421]38%endif ; MODULE_ADVANCED_ATA
[364]39
40
41;--------------------------------------------------------------------
[421]42; AccessDPT_GetDriveSelectByteForOldInt13hToAL
43; AccessDPT_GetDriveSelectByteForEbiosToAL
[150]44; Parameters:
45; DS:DI: Ptr to Disk Parameter Table
46; Returns:
47; AL: Drive Select Byte
48; Corrupts registers:
49; Nothing
50;--------------------------------------------------------------------
51ALIGN JUMP_ALIGN
[421]52AccessDPT_GetDriveSelectByteForOldInt13hToAL:
53 mov al, [di+DPT.bFlagsLow]
54 test al, FLGL_DPT_ASSISTED_LBA
55 jnz SHORT GetDriveSelectByteForAssistedLBAtoAL
56
57 and al, FLG_DRVNHEAD_DRV ; Clear all but drive select bit
[150]58 or al, MASK_DRVNHEAD_SET ; Bits set to 1 for old drives
59 ret
60
[421]61%ifdef MODULE_EBIOS
62ALIGN JUMP_ALIGN
63AccessDPT_GetDriveSelectByteForEbiosToAL:
[443]64 mov al, [di+DPT.bFlagsLow]
[421]65 ; Fall to GetDriveSelectByteForAssistedLBAtoAL
66%endif ; MODULE_EBIOS
[150]67
[421]68ALIGN JUMP_ALIGN
69GetDriveSelectByteForAssistedLBAtoAL:
70 and al, FLG_DRVNHEAD_DRV ; Master / Slave select
71 or al, FLG_DRVNHEAD_LBA | MASK_DRVNHEAD_SET
72 ret
73
74
[150]75;--------------------------------------------------------------------
76; AccessDPT_GetDeviceControlByteToAL
77; Parameters:
78; DS:DI: Ptr to Disk Parameter Table
79; Returns:
80; AL: Device Control Byte
81; Corrupts registers:
82; Nothing
83;--------------------------------------------------------------------
84ALIGN JUMP_ALIGN
85AccessDPT_GetDeviceControlByteToAL:
[411]86%ifdef MODULE_IRQ
[150]87 xor al, al
[158]88 test BYTE [di+DPT.bFlagsLow], FLGL_DPT_ENABLE_IRQ
[150]89 jnz SHORT .EnableDeviceIrq
90 or al, FLG_DEVCONTROL_nIEN ; Disable IRQ
91.EnableDeviceIrq:
[411]92%else
93 mov al, FLG_DEVCONTROL_nIEN ; Disable IRQ
94%endif
[150]95 ret
96
[227]97
[150]98;--------------------------------------------------------------------
[227]99; AccessDPT_GetLCHStoAXBLBH
[3]100; Parameters:
101; DS:DI: Ptr to Disk Parameter Table
102; Returns:
[227]103; AX: Number of L-CHS cylinders
104; BL: Number of L-CHS heads
105; BH: Number of L-CHS sectors per track
[3]106; Corrupts registers:
[421]107; Nothing
[3]108;--------------------------------------------------------------------
[227]109AccessDPT_GetLCHStoAXBLBH:
[421]110 mov ax, [di+DPT.wLchsCylinders]
111 mov bx, [di+DPT.wLchsHeadsAndSectors]
[227]112 ret
[173]113
[227]114
[421]115%ifdef MODULE_EBIOS
[227]116;--------------------------------------------------------------------
[230]117; AccessDPT_GetLbaSectorCountToBXDXAX
118; Parameters:
119; DS:DI: Ptr to Disk Parameter Table
120; Returns:
121; BX:DX:AX: 48-bit sector count
122; Corrupts registers:
123; Nothing
124;--------------------------------------------------------------------
125AccessDPT_GetLbaSectorCountToBXDXAX:
126 mov ax, [di+DPT.twLbaSectors]
127 mov dx, [di+DPT.twLbaSectors+2]
128 mov bx, [di+DPT.twLbaSectors+4]
129 ret
[421]130%endif ; MODULE_EBIOS
[230]131
132
133;--------------------------------------------------------------------
[3]134; Returns pointer to DRVPARAMS for master or slave drive.
135;
136; AccessDPT_GetPointerToDRVPARAMStoCSBX
137; Parameters:
138; DS:DI: Ptr to Disk Parameter Table
139; Returns:
140; CS:BX: Ptr to DRVPARAMS
141; Corrupts registers:
142; Nothing
143;--------------------------------------------------------------------
144ALIGN JUMP_ALIGN
145AccessDPT_GetPointerToDRVPARAMStoCSBX:
[422]146 eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] ; CS:BX points to IDEVARS
[150]147 add bx, BYTE IDEVARS.drvParamsMaster ; CS:BX points to Master Drive DRVPARAMS
[158]148 test BYTE [di+DPT.bFlagsLow], FLGL_DPT_SLAVE
[150]149 jz SHORT .ReturnPointerToDRVPARAMS
150 add bx, BYTE DRVPARAMS_size ; CS:BX points to Slave Drive DRVPARAMS
151.ReturnPointerToDRVPARAMS:
[3]152 ret
[200]153
[421]154
[200]155;--------------------------------------------------------------------
[422]156; ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF
[200]157; Parameters:
158; DS:DI: Ptr to Disk Parameter Table
159; Returns:
[422]160; AX: Translate Mode (TRANSLATEMODE_NORMAL, TRANSLATEMODE_LARGE or TRANSLATEMODE_ASSISTED_LBA)
[200]161; unshifted (still shifted where it is in bFlagsLow)
162; ZF: Set based on value in AL
163; Corrupts registers:
[421]164; Nothing
[200]165;--------------------------------------------------------------------
[230]166;
167; Converted to a macro since only called in two places, and the call/ret overhead
[200]168; is not worth it for these two instructions (4 bytes total)
169;
[422]170%macro ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF 0
[200]171 mov al, [di+DPT.bFlagsLow]
[422]172 and ax, BYTE MASKL_DPT_TRANSLATEMODE
[200]173%endmacro
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