Rev 21 | Rev 26 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; IRQ0 HANDLER (TIMER INTERRUPT) ;; |
||
3 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
4 | |||
5 | align 32 |
||
6 | irq0: |
||
8 | poddubny | 7 | pushad |
8 | push ds es |
||
9 | mov ax, os_data |
||
10 | mov ds, ax |
||
11 | mov es, ax |
||
1 | ha | 12 | |
13 | mov edi,[0x3000] |
||
14 | shl edi, 3 |
||
15 | ; fields of TSS descriptor: |
||
16 | mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b |
||
17 | |||
18 | inc dword [timer_ticks] |
||
19 | |||
20 | mov eax, [timer_ticks] |
||
22 | poddubny | 21 | call playNote ; <<<--- Speaker driver |
22 | |||
1 | ha | 23 | cmp eax,[next_usage_update] |
24 | jb .nocounter |
||
25 | add eax,100 |
||
26 | mov [next_usage_update],eax |
||
27 | call updatecputimes |
||
28 | .nocounter: |
||
29 | |||
30 | mov edi, [0x3010] |
||
31 | |||
32 | mov ebx, [edi+0x18] ; time stamp counter add |
||
33 | call _rdtsc |
||
34 | sub eax, ebx |
||
35 | add eax, [edi+0x14] ; counter sum |
||
36 | mov [edi+0x14], eax |
||
37 | |||
38 | mov ebx,[0x3000] |
||
21 | poddubny | 39 | mov [prev_slot], ebx |
1 | ha | 40 | |
8 | poddubny | 41 | cmp [0xffff], byte 1 |
42 | je .do_not_change_task |
||
1 | ha | 43 | |
21 | poddubny | 44 | |
1 | ha | 45 | .waiting_for_termination: |
46 | .waiting_for_reuse: |
||
21 | poddubny | 47 | .waiting_for_event: |
48 | cmp ebx, [0x3004] |
||
49 | jb @f |
||
50 | mov edi, 0x3000 |
||
51 | xor ebx, ebx |
||
52 | @@: |
||
53 | |||
1 | ha | 54 | add edi,0x20 |
55 | inc ebx |
||
56 | |||
57 | mov al, byte [edi+0xA] |
||
58 | cmp al, 3 |
||
59 | je .waiting_for_termination |
||
60 | cmp al, 4 |
||
61 | je .waiting_for_termination |
||
62 | cmp al, 9 |
||
63 | je .waiting_for_reuse |
||
64 | |||
65 | mov [0x3000],ebx |
||
66 | mov [0x3010],edi |
||
67 | |||
21 | poddubny | 68 | cmp al, 5 |
69 | jne .noevents |
||
70 | call get_event_for_app |
||
71 | test eax, eax |
||
72 | jz .waiting_for_event |
||
73 | mov [event_sched], eax |
||
74 | mov [edi+0xA], byte 0 |
||
75 | cmp ebx, [prev_slot] |
||
76 | sete [0xffff] |
||
77 | .noevents: |
||
78 | |||
79 | |||
8 | poddubny | 80 | .do_not_change_task: |
1 | ha | 81 | |
82 | call _rdtsc |
||
83 | mov [edi+0x18],eax |
||
84 | |||
85 | shl ebx, 3 |
||
86 | xor eax, eax |
||
87 | add ebx, tss0 |
||
14 | poddubny | 88 | mov word [far_jump.sel], bx ; selector |
89 | mov dword [far_jump.offs], eax ; offset |
||
1 | ha | 90 | |
91 | mov al,0x20 ; send End Of Interrupt signal |
||
92 | mov dx,0x20 |
||
93 | out dx,al |
||
8 | poddubny | 94 | |
10 | poddubny | 95 | cmp [0xffff],byte 0 |
96 | je .switch |
||
97 | dec byte [0xffff] |
||
11 | poddubny | 98 | jz @f |
10 | poddubny | 99 | .switch: |
14 | poddubny | 100 | jmp pword [far_jump] |
9 | halyavin | 101 | inc [context_counter] ;noname & halyavin |
8 | poddubny | 102 | @@: |
10 | poddubny | 103 | |
8 | poddubny | 104 | pop es ds |
105 | popad |
||
106 | iret |
||
1 | ha | 107 | |
8 | poddubny | 108 | |
109 | uglobal |
||
21 | poddubny | 110 | align 4 |
14 | poddubny | 111 | far_jump: |
112 | .offs dd ? |
||
113 | .sel dw ? |
||
114 | context_counter dd ? ;noname & halyavin |
||
115 | next_usage_update dd ? |
||
116 | timer_ticks dd ? |
||
21 | poddubny | 117 | prev_slot dd ? |
118 | event_sched dd ? |
||
1 | ha | 119 | endg |
120 | |||
121 | |||
122 | align 4 |
||
123 | change_task: |
||
124 | |||
125 | mov [0xffff],byte 2 |
||
126 | |||
127 | dec dword [timer_ticks] ; because irq0 will increase it |
||
128 | |||
129 | int 0x20 ; irq0 handler |
||
130 | |||
131 | ret |
||
132 | |||
133 | |||
134 | |||
135 | align 4 |
||
136 | updatecputimes: |
||
137 | |||
138 | mov eax,[idleuse] |
||
139 | mov [idleusesec],eax |
||
140 | mov [idleuse],dword 0 |
||
141 | mov ecx, [0x3004] |
||
142 | mov edi, 0x3020 |
||
143 | .newupdate: |
||
144 | mov ebx,[edi+0x14] |
||
145 | mov [edi+0x1c],ebx |
||
146 | mov [edi+0x14],dword 0 |
||
147 | add edi,0x20 |
||
148 | dec ecx |
||
149 | jnz .newupdate |
||
150 | |||
151 | ret---><---><<---> |