source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeIrq.asm@ 510

Last change on this file since 510 was 376, checked in by gregli@…, 13 years ago

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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, 2011-2012 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; IdeIrq_WaitForIRQ
25; Parameters:
26; DS:DI: Ptr to DPT (in RAMVARS segment)
27; Returns:
28; CF: Set if wait done by operating system
29; Cleared if BIOS must perform task flag polling
30; Corrupts registers:
31; AX
32;--------------------------------------------------------------------
33ALIGN JUMP_ALIGN
34IdeIrq_WaitForIRQ:
35
36;--------------------------------------------------------------------
37; .NotifyOperatingSystemAboutWaitingForIRQ
38; Parameters:
39; Nothing
40; Returns:
41; CF: Set if wait done by operating system
42; Cleared if BIOS must perform task flag polling
43; Corrupts registers:
44; AX
45;--------------------------------------------------------------------
46.NotifyOperatingSystemAboutWaitingForIRQ:
47 push ds
48
49 LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX
50 mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h)
51 cli ; Disable interrupts
52 cmp al, [BDA.bHDTaskFlg] ; Task flag already set?
53 jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
54 int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy
55 jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
56
57 ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
58 test ah, ah ; OS hook supported? (clears CF)
59 jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
60 stc ; Set CF since wait done by OS
61.ReturnFromWaitNotify:
62 sti ; Enable interrupts
63 pop ds
64 ret
65
66
67;--------------------------------------------------------------------
68; IDE Interrupt Service Routines.
69;
70; IdeIrq_InterruptServiceRoutineForIrqs2to7
71; IdeIrq_InterruptServiceRoutineForIrqs8to15
72; Parameters:
73; Nothing
74; Returns:
75; Nothing
76; Corrupts registers:
77; Nothing
78;--------------------------------------------------------------------
79ALIGN JUMP_ALIGN
80IdeIrq_InterruptServiceRoutineForIrqs2to7:
81 push di
82 push ax
83 call AcknowledgeIdeInterruptAndSetTaskFlag
84
85 mov al, COMMAND_END_OF_INTERRUPT
86 jmp SHORT AcknowledgeMasterInterruptController
87
88
89ALIGN JUMP_ALIGN
90IdeIrq_InterruptServiceRoutineForIrqs8to15:
91 push di
92 push ax
93 call AcknowledgeIdeInterruptAndSetTaskFlag
94
95 mov al, COMMAND_END_OF_INTERRUPT
96 out SLAVE_8259_COMMAND_out, al ; Acknowledge Slave 8259
97AcknowledgeMasterInterruptController:
98 out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259
99
100 ; Issue Int 15h, function AX=9100h (Interrupt ready)
101 mov ax, OS_HOOK_DEVICE_POST<<8 ; Interrupt ready, device 0 (HD)
102 int BIOS_SYSTEM_INTERRUPT_15h
103
104 pop ax
105 pop di
106 iret
107
108
109;--------------------------------------------------------------------
110; AcknowledgeIdeInterruptAndSetTaskFlag
111; Parameters:
112; Nothing
113; Returns:
114; Nothing
115; Corrupts registers:
116; AX
117;--------------------------------------------------------------------
118ALIGN JUMP_ALIGN
119AcknowledgeIdeInterruptAndSetTaskFlag:
120 push ds
121 push si
122 push dx
123 push bx
124
125 ; Reading Status Register acknowledges IDE interrupt
126 call RamVars_GetSegmentToDS
127 mov bl, FLGH_DPT_INTERRUPT_IN_SERVICE
128 call FindDPT_ToDSDIforFlagsHighInBL
129 INPUT_TO_AL_FROM_IDE_REGISTER STATUS_REGISTER_in
130
131 ; Clear Interrupt In-Service Flag from DPT
132 and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_INTERRUPT_IN_SERVICE
133
134 ; Set Task Flag
135 LOAD_BDA_SEGMENT_TO ds, ax
136 mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
137
138 pop bx
139 pop dx
140 pop si
141 pop ds
142 ret
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