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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 | |||
101 | poddubny | 5 | |
1 | ha | 6 | align 32 |
7 | irq0: |
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40 | halyavin | 8 | save_ring3_context |
8 | poddubny | 9 | mov ax, os_data |
10 | mov ds, ax |
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11 | mov es, ax |
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1 | ha | 12 | |
13 | inc dword [timer_ticks] |
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14 | |||
15 | mov eax, [timer_ticks] |
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22 | poddubny | 16 | call playNote ; <<<--- Speaker driver |
17 | |||
1 | ha | 18 | cmp eax,[next_usage_update] |
19 | jb .nocounter |
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20 | add eax,100 |
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21 | mov [next_usage_update],eax |
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22 | call updatecputimes |
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23 | .nocounter: |
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24 | |||
101 | poddubny | 25 | cmp [0xffff], byte 1 |
26 | jne .change_task |
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27 | |||
28 | mov al,0x20 ; send End Of Interrupt signal |
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29 | mov dx,0x20 |
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30 | out dx,al |
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31 | |||
32 | mov [0xffff], byte 0 |
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33 | |||
34 | restore_ring3_context |
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35 | iret |
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36 | |||
37 | .change_task: |
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38 | call update_counters |
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39 | |||
40 | call find_next_task |
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41 | mov ecx, eax |
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42 | |||
43 | mov al,0x20 ; send End Of Interrupt signal |
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44 | mov dx,0x20 |
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45 | out dx,al |
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46 | |||
47 | test ecx, ecx ; if there is only one running process |
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48 | jnz .return |
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49 | |||
50 | call do_change_task |
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51 | |||
52 | .return: |
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53 | restore_ring3_context |
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54 | iret |
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55 | |||
56 | |||
57 | align 4 |
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58 | change_task: |
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59 | |||
60 | pushfd |
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61 | cli |
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62 | pushad |
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63 | |||
64 | call update_counters |
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65 | call find_next_task |
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66 | test eax, eax ; the same task -> skip switch |
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67 | jnz .return |
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68 | |||
69 | mov [0xffff],byte 1 |
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70 | call do_change_task |
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71 | |||
72 | .return: |
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73 | popad |
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74 | popfd |
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75 | |||
76 | ret |
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77 | |||
78 | |||
79 | uglobal |
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80 | align 4 |
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81 | far_jump: |
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82 | .offs dd ? |
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83 | .sel dw ? |
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84 | context_counter dd ? ;noname & halyavin |
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85 | next_usage_update dd ? |
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86 | timer_ticks dd ? |
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87 | prev_slot dd ? |
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88 | event_sched dd ? |
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89 | endg |
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90 | |||
91 | |||
92 | update_counters: |
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1 | ha | 93 | mov edi, [0x3010] |
94 | mov ebx, [edi+0x18] ; time stamp counter add |
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95 | call _rdtsc |
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96 | sub eax, ebx |
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97 | add eax, [edi+0x14] ; counter sum |
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98 | mov [edi+0x14], eax |
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101 | poddubny | 99 | ret |
1 | ha | 100 | |
101 | poddubny | 101 | |
102 | ; Find next task to execute |
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103 | ; result: ebx = number of the selected task |
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104 | ; [0xffff] = 1 if the task is the same |
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105 | find_next_task: |
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1 | ha | 106 | mov ebx,[0x3000] |
21 | poddubny | 107 | mov [prev_slot], ebx |
1 | ha | 108 | |
109 | .waiting_for_termination: |
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110 | .waiting_for_reuse: |
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21 | poddubny | 111 | .waiting_for_event: |
40 | halyavin | 112 | .suspended: |
21 | poddubny | 113 | cmp ebx, [0x3004] |
114 | jb @f |
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115 | mov edi, 0x3000 |
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116 | xor ebx, ebx |
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117 | @@: |
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118 | |||
1 | ha | 119 | add edi,0x20 |
120 | inc ebx |
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121 | |||
122 | mov al, byte [edi+0xA] |
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101 | poddubny | 123 | test al, al |
124 | jz .found |
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40 | halyavin | 125 | cmp al, 1 |
126 | jz .suspended |
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127 | cmp al, 2 |
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128 | jz .suspended |
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1 | ha | 129 | cmp al, 3 |
130 | je .waiting_for_termination |
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131 | cmp al, 4 |
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132 | je .waiting_for_termination |
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133 | cmp al, 9 |
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134 | je .waiting_for_reuse |
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135 | |||
136 | mov [0x3000],ebx |
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137 | mov [0x3010],edi |
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138 | |||
21 | poddubny | 139 | cmp al, 5 |
140 | jne .noevents |
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141 | call get_event_for_app |
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142 | test eax, eax |
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143 | jz .waiting_for_event |
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144 | mov [event_sched], eax |
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145 | mov [edi+0xA], byte 0 |
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26 | halyavin | 146 | .noevents: |
101 | poddubny | 147 | .found: |
148 | mov [0x3000],ebx |
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149 | mov [0x3010],edi |
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1 | ha | 150 | call _rdtsc |
151 | mov [edi+0x18],eax |
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152 | |||
101 | poddubny | 153 | xor eax, eax |
154 | cmp ebx, [prev_slot] |
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155 | sete al |
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156 | ret |
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157 | |||
158 | ; in: ebx = TSS selector index |
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159 | do_change_task: |
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1 | ha | 160 | shl ebx, 3 |
161 | xor eax, eax |
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162 | add ebx, tss0 |
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101 | poddubny | 163 | mov [far_jump.sel], bx ; selector |
164 | mov [far_jump.offs], eax ; offset |
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14 | poddubny | 165 | jmp pword [far_jump] |
9 | halyavin | 166 | inc [context_counter] ;noname & halyavin |
101 | poddubny | 167 | ret |
1 | ha | 168 | |
8 | poddubny | 169 | |
1 | ha | 170 | |
171 | align 4 |
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172 | updatecputimes: |
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173 | |||
174 | mov eax,[idleuse] |
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175 | mov [idleusesec],eax |
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176 | mov [idleuse],dword 0 |
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177 | mov ecx, [0x3004] |
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178 | mov edi, 0x3020 |
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179 | .newupdate: |
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180 | mov ebx,[edi+0x14] |
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181 | mov [edi+0x1c],ebx |
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182 | mov [edi+0x14],dword 0 |
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183 | add edi,0x20 |
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184 | dec ecx |
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185 | jnz .newupdate |
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186 | |||
187 | ret---><---><<---> |