source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeIrq.asm @ 233

Last change on this file since 233 was 233, checked in by gregli@…, 12 years ago

Serial Port: split single byte port and baud into two bytes, taking advantage of the two bytes in DPT_SERIAL, which supports more serial baud rates and in particular fixed a bug where a 4x client machine couldn't talk to a 115.2K server machine. This is a wide change, touching lots of files, but most are shallow changes. DetectPrint.asm took the most significant changes, now it calculates the baud rate to display instead of using characters provided by the Configurator. The Configurator now has a new menu flag, FLG_MENUITEM_CHOICESTRINGS, for specifying that values are not linear and they should be lookedup rather than indexed. Finally, another important bug fixed here is that in some error cases, the serial port code could get into an infinite loop waiting ont the hardware; now it has a timeout.
File size: 3.5 KB
Line 
1; Project name  :   XTIDE Universal BIOS
2; Description   :   Interrupt handling related functions.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; IdeIrq_WaitForIRQ
9;   Parameters:
10;       DS:DI:  Ptr to DPT (in RAMVARS segment)
11;   Returns:
12;       CF:     Set if wait done by operating system
13;               Cleared if BIOS must perform task flag polling
14;   Corrupts registers:
15;       AX
16;--------------------------------------------------------------------
17ALIGN JUMP_ALIGN
18IdeIrq_WaitForIRQ:
19
20;--------------------------------------------------------------------
21; .NotifyOperatingSystemAboutWaitingForIRQ
22;   Parameters:
23;       Nothing
24;   Returns:
25;       CF:     Set if wait done by operating system
26;               Cleared if BIOS must perform task flag polling
27;   Corrupts registers:
28;       AX
29;--------------------------------------------------------------------
30.NotifyOperatingSystemAboutWaitingForIRQ:
31    push    ds
32
33    LOAD_BDA_SEGMENT_TO ds, ax, !       ; Zero AX
34    mov     ah, OS_HOOK_DEVICE_BUSY     ; Hard disk busy (AX=9000h)
35    cli                                 ; Disable interrupts
36    cmp     al, [BDA.bHDTaskFlg]        ; Task flag already set?
37    jc      SHORT .ReturnFromWaitNotify ;  If so, skip OS notification
38    int     BIOS_SYSTEM_INTERRUPT_15h   ; OS hook, device busy
39    jnc     SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
40
41    ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
42    test    ah, ah                      ; OS hook supported? (clears CF)
43    jnz     SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
44    stc                                 ; Set CF since wait done by OS
45.ReturnFromWaitNotify:
46    sti                                 ; Enable interrupts
47    pop     ds
48    ret
49
50
51;--------------------------------------------------------------------
52; IDE Interrupt Service Routines.
53;
54; IdeIrq_InterruptServiceRoutineForIrqs2to7
55; IdeIrq_InterruptServiceRoutineForIrqs8to15
56;   Parameters:
57;       Nothing
58;   Returns:
59;       Nothing
60;   Corrupts registers:
61;       Nothing
62;--------------------------------------------------------------------
63ALIGN JUMP_ALIGN
64IdeIrq_InterruptServiceRoutineForIrqs2to7:
65    push    di
66    push    ax
67    call    AcknowledgeIdeInterruptAndSetTaskFlag
68
69    mov     al, COMMAND_END_OF_INTERRUPT
70    jmp     SHORT AcknowledgeMasterInterruptController
71
72
73ALIGN JUMP_ALIGN
74IdeIrq_InterruptServiceRoutineForIrqs8to15:
75    push    di
76    push    ax
77    call    AcknowledgeIdeInterruptAndSetTaskFlag
78
79    mov     al, COMMAND_END_OF_INTERRUPT
80    out     SLAVE_8259_COMMAND_out, al  ; Acknowledge Slave 8259
81AcknowledgeMasterInterruptController:
82    out     MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259
83
84    ; Issue Int 15h, function AX=9100h (Interrupt ready)
85    mov     ax, OS_HOOK_DEVICE_POST<<8  ; Interrupt ready, device 0 (HD)
86    int     BIOS_SYSTEM_INTERRUPT_15h
87
88    pop     ax
89    pop     di
90    iret
91
92
93;--------------------------------------------------------------------
94; AcknowledgeIdeInterruptAndSetTaskFlag
95;   Parameters:
96;       Nothing
97;   Returns:
98;       Nothing
99;   Corrupts registers:
100;       AX
101;--------------------------------------------------------------------
102ALIGN JUMP_ALIGN
103AcknowledgeIdeInterruptAndSetTaskFlag:
104    push    ds
105    push    si
106    push    dx
107    push    bx
108
109    ; Reading Status Register acknowledges IDE interrupt
110    call    RamVars_GetSegmentToDS
111    mov     bl, FLGH_DPT_INTERRUPT_IN_SERVICE
112    call    FindDPT_ToDSDIforFlagsHighInBL
113    mov     dl, STATUS_REGISTER_in
114    call    IdeIO_InputToALfromIdeRegisterInDL
115
116    ; Clear Interrupt In-Service Flag from DPT
117    and     BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_INTERRUPT_IN_SERVICE
118
119    ; Set Task Flag
120    LOAD_BDA_SEGMENT_TO ds, ax
121    mov     BYTE [BDA.bHDTaskFlg], 0FFh     ; Set task flag
122
123    pop     bx
124    pop     dx
125    pop     si
126    pop     ds
127    ret
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