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Rev | Author | Line No. | Line |
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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; IRQ0 HANDLER (TIMER INTERRUPT) ;; |
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3 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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4 | |||
5 | align 32 |
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6 | irq0: |
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40 | halyavin | 7 | save_ring3_context |
8 | poddubny | 8 | mov ax, os_data |
9 | mov ds, ax |
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10 | mov es, ax |
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1 | ha | 11 | |
12 | mov edi,[0x3000] |
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13 | shl edi, 3 |
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14 | ; fields of TSS descriptor: |
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66 | diamond | 15 | ; mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b |
1 | ha | 16 | |
17 | inc dword [timer_ticks] |
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18 | |||
19 | mov eax, [timer_ticks] |
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22 | poddubny | 20 | call playNote ; <<<--- Speaker driver |
21 | |||
1 | ha | 22 | cmp eax,[next_usage_update] |
23 | jb .nocounter |
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24 | add eax,100 |
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25 | mov [next_usage_update],eax |
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26 | call updatecputimes |
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27 | .nocounter: |
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28 | |||
29 | mov edi, [0x3010] |
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30 | |||
31 | mov ebx, [edi+0x18] ; time stamp counter add |
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32 | call _rdtsc |
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33 | sub eax, ebx |
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34 | add eax, [edi+0x14] ; counter sum |
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35 | mov [edi+0x14], eax |
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36 | |||
37 | mov ebx,[0x3000] |
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21 | poddubny | 38 | mov [prev_slot], ebx |
1 | ha | 39 | |
8 | poddubny | 40 | cmp [0xffff], byte 1 |
41 | je .do_not_change_task |
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1 | ha | 42 | |
21 | poddubny | 43 | |
1 | ha | 44 | .waiting_for_termination: |
45 | .waiting_for_reuse: |
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21 | poddubny | 46 | .waiting_for_event: |
40 | halyavin | 47 | .suspended: |
21 | poddubny | 48 | cmp ebx, [0x3004] |
49 | jb @f |
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50 | mov edi, 0x3000 |
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51 | xor ebx, ebx |
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52 | @@: |
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53 | |||
1 | ha | 54 | add edi,0x20 |
55 | inc ebx |
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56 | |||
57 | mov al, byte [edi+0xA] |
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40 | halyavin | 58 | cmp al, 1 |
59 | jz .suspended |
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60 | cmp al, 2 |
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61 | jz .suspended |
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1 | ha | 62 | cmp al, 3 |
63 | je .waiting_for_termination |
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64 | cmp al, 4 |
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65 | je .waiting_for_termination |
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66 | cmp al, 9 |
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67 | je .waiting_for_reuse |
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68 | |||
69 | mov [0x3000],ebx |
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70 | mov [0x3010],edi |
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71 | |||
21 | poddubny | 72 | cmp al, 5 |
73 | jne .noevents |
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74 | call get_event_for_app |
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75 | test eax, eax |
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76 | jz .waiting_for_event |
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77 | mov [event_sched], eax |
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78 | mov [edi+0xA], byte 0 |
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26 | halyavin | 79 | .noevents: |
21 | poddubny | 80 | cmp ebx, [prev_slot] |
81 | sete [0xffff] |
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82 | |||
83 | |||
8 | poddubny | 84 | .do_not_change_task: |
1 | ha | 85 | |
86 | call _rdtsc |
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87 | mov [edi+0x18],eax |
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88 | |||
89 | shl ebx, 3 |
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90 | xor eax, eax |
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91 | add ebx, tss0 |
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14 | poddubny | 92 | mov word [far_jump.sel], bx ; selector |
93 | mov dword [far_jump.offs], eax ; offset |
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100 | halyavin | 94 | |
95 | cmp [irq0needeoi],byte 0 |
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96 | mov [irq0needeoi],byte 1 |
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97 | jz .noeoi |
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1 | ha | 98 | |
99 | mov al,0x20 ; send End Of Interrupt signal |
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100 | mov dx,0x20 |
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101 | out dx,al |
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100 | halyavin | 102 | .noeoi: |
8 | poddubny | 103 | |
10 | poddubny | 104 | cmp [0xffff],byte 0 |
105 | je .switch |
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106 | dec byte [0xffff] |
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11 | poddubny | 107 | jz @f |
10 | poddubny | 108 | .switch: |
14 | poddubny | 109 | jmp pword [far_jump] |
9 | halyavin | 110 | inc [context_counter] ;noname & halyavin |
8 | poddubny | 111 | @@: |
10 | poddubny | 112 | |
40 | halyavin | 113 | restore_ring3_context |
8 | poddubny | 114 | iret |
1 | ha | 115 | |
8 | poddubny | 116 | |
117 | uglobal |
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21 | poddubny | 118 | align 4 |
14 | poddubny | 119 | far_jump: |
120 | .offs dd ? |
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121 | .sel dw ? |
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122 | context_counter dd ? ;noname & halyavin |
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123 | next_usage_update dd ? |
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124 | timer_ticks dd ? |
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21 | poddubny | 125 | prev_slot dd ? |
126 | event_sched dd ? |
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1 | ha | 127 | endg |
100 | halyavin | 128 | iglobal |
129 | irq0needeoi db 1 |
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130 | endg |
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1 | ha | 131 | |
132 | |||
133 | align 4 |
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134 | change_task: |
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135 | |||
100 | halyavin | 136 | pushfd |
137 | cli |
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1 | ha | 138 | mov [0xffff],byte 2 |
139 | |||
100 | halyavin | 140 | mov [irq0needeoi],byte 0 |
1 | ha | 141 | dec dword [timer_ticks] ; because irq0 will increase it |
142 | |||
143 | int 0x20 ; irq0 handler |
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100 | halyavin | 144 | popfd |
1 | ha | 145 | |
146 | ret |
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147 | |||
148 | |||
149 | |||
150 | align 4 |
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151 | updatecputimes: |
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152 | |||
153 | mov eax,[idleuse] |
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154 | mov [idleusesec],eax |
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155 | mov [idleuse],dword 0 |
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156 | mov ecx, [0x3004] |
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157 | mov edi, 0x3020 |
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158 | .newupdate: |
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159 | mov ebx,[edi+0x14] |
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160 | mov [edi+0x1c],ebx |
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161 | mov [edi+0x14],dword 0 |
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162 | add edi,0x20 |
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163 | dec ecx |
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164 | jnz .newupdate |
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165 | |||
166 | ret---><---><<---> |