source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeIrq.asm@ 539

Last change on this file since 539 was 535, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • AH=48h now returns Device Parameter Table Extension when RETURN_DPTE_ON_AH48H is defined.
  • Removed few unnecessary instructions from hardware interrupt handler.
  • P-Cylinders returned by AH=48h are no longer calculated from L-CHS capacity.
File size: 3.5 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Interrupt handling related functions.
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; IdeIrq_WaitForIRQ
25; Parameters:
26; DS:DI: Ptr to DPT (in RAMVARS segment)
27; Returns:
28; Nothing
29; Corrupts registers:
30; AX
31;--------------------------------------------------------------------
32ALIGN JUMP_ALIGN
33IdeIrq_WaitForIRQ:
34 push ds
35
36 LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX
37 mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h)
38 cli ; Disable interrupts
39 cmp al, [BDA.bHDTaskFlg] ; Task flag already set?
40 jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
41 int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy
42
43.ReturnFromWaitNotify:
44 sti ; Enable interrupts
45 pop ds
46 ret
47
48
49;--------------------------------------------------------------------
50; IDE Interrupt Service Routines.
51;
52; IdeIrq_InterruptServiceRoutineForIrqs2to7
53; IdeIrq_InterruptServiceRoutineForIrqs8to15
54; Parameters:
55; Nothing
56; Returns:
57; Nothing
58; Corrupts registers:
59; Nothing
60;--------------------------------------------------------------------
61ALIGN JUMP_ALIGN
62IdeIrq_InterruptServiceRoutineForIrqs2to7:
63 push di
64 push ax
65 call AcknowledgeIdeInterruptAndSetTaskFlag
66
67 mov al, COMMAND_END_OF_INTERRUPT
68 jmp SHORT AcknowledgeMasterInterruptController
69
70
71ALIGN JUMP_ALIGN
72IdeIrq_InterruptServiceRoutineForIrqs8to15:
73 push di
74 push ax
75 call AcknowledgeIdeInterruptAndSetTaskFlag
76
77 mov al, COMMAND_END_OF_INTERRUPT
78 out SLAVE_8259_COMMAND_out, al ; Acknowledge Slave 8259
79AcknowledgeMasterInterruptController:
80 out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259
81
82 ; Issue Int 15h, function AX=9100h (Interrupt ready)
83 clc ; Must be called with CF clear
84 mov ax, OS_HOOK_DEVICE_POST<<8 ; Interrupt ready, device 0 (HD)
85 int BIOS_SYSTEM_INTERRUPT_15h
86
87 pop ax
88 pop di
89 iret
90
91
92;--------------------------------------------------------------------
93; AcknowledgeIdeInterruptAndSetTaskFlag
94; Parameters:
95; Nothing
96; Returns:
97; Nothing
98; Corrupts registers:
99; AX
100;--------------------------------------------------------------------
101ALIGN JUMP_ALIGN
102AcknowledgeIdeInterruptAndSetTaskFlag:
103 push ds
104 push si
105 push dx
106 push bx
107
108 ; Reading Status Register acknowledges IDE interrupt
109 call RamVars_GetSegmentToDS
110 mov bl, FLGH_DPT_INTERRUPT_IN_SERVICE
111 call FindDPT_ToDSDIforFlagsHighInBL
112 INPUT_TO_AL_FROM_IDE_REGISTER STATUS_REGISTER_in
113
114 ; Clear Interrupt In-Service Flag from DPT
115 and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_INTERRUPT_IN_SERVICE
116
117 ; Set Task Flag
118 LOAD_BDA_SEGMENT_TO ds, ax
119 mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
120
121 pop bx
122 pop dx
123 pop si
124 pop ds
125 ret
Note: See TracBrowser for help on using the repository browser.